The QmaXTM Series of high current single output DC-DC converters from Power Bel Solutions sets new standards for thermal performance and power density in the quarter brick package. The 40A QM48S converters of the QmaXTM Series provide thermal performance in high temperature environments that is comparable to or exceeds the industry's leading 40A half bricks. This is accomplished through the use of patent pending circuit, packaging and processing techniques to achieve ultra-high efficiency, excellent thermal management and a very low body profile. The QM48S40 converters have a power density of up to 130 W/in3, more than twice that of competitors' 40A half bricks. Over 1 square inch of board space can be saved for every slot in which a 40A half brick is replaced with a QM48S40 converter from Power Bel Solutions. Low body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for downstream devices. The use of 100% automation for assembly, coupled with Power Bel Solutions advanced electric and thermal design, results in a product with extremely high reliability. Operating from a 36-75 V input, the QmaXTM Series converters provide standard output voltage for 3.3 V. Output can be trimmed from -20% to +10% of the nominal output voltage, thus providing outstanding design flexibility. Delivers up to 40 A (132 W) Industry-standard SM quarter brick pinout Higher current capability at 70 C than most competitors' 40 A half bricks On-board input differential LC-filter High efficiency - no heat sink required Start up into pre-biased output No minimum load required Low profile: 0.28" [7.1 mm] Low weight: 1.06 oz [30 g] typical Meets Basic Insulation requirements of EN60950 Withstands 100 V input transient for 100 ms Fixed-frequency operation Fully protected Remote output sense Output voltage trim range: +10%/-20% with Industry-standard trim equations High reliability: MTBF of 2.6 million hours, calculated per Telcordia TR332, Method I Case 1 Positive or negative logic ON/OFF option Approved to the following Safety Standards: UL/CSA60950-1, EN60950-1, and IEC60950-1 Meets conducted emissions requirements of FCC Class B and EN 55022 Class B with external filter All materials meet UL94, V-0 flammability rating QM48S40033 2 Conditions: TA = 25C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. PARAMETER CONDITIONS / DESCRIPTION MIN TYP MAX UNITS 80 Vdc Absolute Maximum Ratings Input Voltage Continuous 0 Operating Ambient Temperature -40 85 C Storage Temperature -55 125 C Input Characteristics Operating Input Voltage Range 36 48 75 Vdc Turn-on Threshold 33 34 35 Vdc Turn-off Threshold 31 32 33 Vdc 100 Vdc Input Under Voltage Lockout Input Voltage Transient Non-latching 100 ms Isolation Characteristics I/O Isolation 2000 Isolation Capacitance Vdc 1.4 Isolation Resistance nF 10 M Feature Characteristics Switching Frequency Output Voltage Trim Range 415 1 Industry-std. equations on page 4 Remote Sense Compensation1 Percent of VOUT(nom) Output Over-Voltage Protection Non-latching Auto-Restart Period Applies to all protection features -20 117 Turn-On Time 128 kHz +10 % +10 % 140 % 100 ms 4 ms ON/OFF Control (Positive Logic) Converter Off -20 0.8 Vdc 2.4 20 Vdc Converter Off 2.4 20 Vdc Converter On -20 0.8 Vdc 4.1 Adc Converter On ON/OFF Control (Negative Logic) Input Characteristics Maximum Input Current 40 Adc, 3.3 Vdc Out @ 36 Vdc In Input Stand-by Current Vin = 48 V, converter disabled 3 mAdc Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 63 mAdc Input Reflected-Ripple Current 25MHz bandwidth 7.5 mAPK-PK Input Voltage Ripple Rejection 120Hz 64 dB Output Characteristics Output Voltage Set Point (no load) 3.267 3.300 3.333 Vdc 2 5 mV Output Regulation Over Line tech.support@psbel.com QM48S40033 3 Over Load 2 Output Voltage Range Over line, load and temperature2 Output Ripple and Noise - 25MHz bandwidth Full load + 10 F tantalum + 1 F ceramic External Load Capacitance Plus full load (resistive) 3.250 30 Output Current Range 0 5 mV 3.350 Vdc 50 mVPK-PK 40,000 F 40 Adc Current Limit Inception Non-latching 47 52 Adc Peak Short-Circuit Current Non-latching. Short=10m. 50 60 A RMS Short-Circuit Current Non-latching 10 15 Arms Co = 470 F tantalum + 1 F ceramic 120 mV 80 s 100% Load 90.5 % 50% Load 92.5 % 42 Dynamic Response Load Change 25% of Iout Max, di/dt = 1 A/S Setting Time to 1% Efficiency 1) 2) Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources should not exceed 10% of VOUT(nom), in order to insure specified operation of over-voltage protection circuitry. -40C to 85C 2.1 These power converters have been designed to be stable with no external capacitors when used in low inductance input and output circuits. However, in many applications, the inductance associated with the distribution from the power source to the input of the converter can affect the stability of the converter. The addition of a 33 F electrolytic capacitor with an ESR < 1 across the input helps ensure stability of the converter. In many applications, the user has to use decoupling capacitance at the load. The power converter will exhibit stable operation with external load capacitance up to 40,000 F. 2.2 The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control options available, positive logic and negative logic and both are referenced to Vin(-). Typical connections are shown in Fig. 1. Vin (+) QmaX TM Series Converter (Top View) ON/OFF Vin Vout (+) SENSE (+) TRIM Rload SENSE (-) Vin (-) Vout (-) CONTROL INPUT Figure 1. Circuit configuration for ON/OFF function. The positive logic version turns on when the ON/OFF pin is at a logic high and turns off when at a logic low. The converter is on when the ON/OFF pin is left open. Europe, Middle East +353 61 225 977 North America +1 408 785 5200 (c) 2016 Bel Power Solutions & Protection BCD.00793_AB Asia-Pacific +86 755 298 85888 QM48S40033 4 The negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. The ON/OFF pin can be hard wired directly to Vin (-) to enable automatic power up of the converter without the need of an external control signal. ON/OFF pin is internally pulled-up to 5 V through a resistor. A mechanical switch, open collector transistor, or FET can be used to drive the input of the ON/OFF pin. The device must be capable of sinking up to 0.2 mA at a low level voltage of 0.8 V. An external voltage source (20 V maximum) may be connected directly to the ON/OFF input, in which case it must be capable of sourcing or sinking up to 1 mA depending on the signal polarity. See the Start-up Information section for system timing waveforms associated with use of the ON/OFF pin. 2.3 The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter and the load. The SENSE (-) (Pin 5) and SENSE (+) (Pin 7) pins should be connected at the load or at the point where regulation is required (see Fig. 2). Vin (+) QmaX TM Series Converter Vout (+) Rw 100 (Top View) ON/OFF Vin SENSE (+) TRIM Rload SENSE (-) 10 Vin (-) Vout (-) Rw Figure 2. Remote sense circuit configuration If remote sensing is not required, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin must be connected to the Vout(+) pin (Pin 8) to ensure the converter will regulate at the specified output voltage. If these connections are not made, the converter will deliver an output voltage that is slightly higher than the specified value. Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces should be located close to a ground plane to minimize system noise and insure optimum performance. When wiring discretely, twisted pair wires should be used to connect the sense lines to the load to reduce susceptibility to noise. The converter's output over-voltage protection (OVP) senses the voltage across Vout(+) and Vout(-), and not across the sense lines, so the resistance (and resulting voltage drop) between the output pins of the converter and the load should be minimized to prevent unwanted triggering of the OVP. When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of the converter, equal to the product of the nominal output voltage and the allowable output current for the given conditions. When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rating in order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the same percentage to ensure the converter's actual output power remains at or below the maximum allowable output power. 2.4 The output voltage can be adjusted up 10% or down 20% relative to the rated output voltage by the addition of an externally connected resistor. Trim up to 10% is guaranteed only at Vin 40 V, and it is marginal (8% to 10%) at Vin = 36 V. The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1 F capacitor is connected internally between the TRIM and SENSE(-) pins. To increase the output voltage, refer to Fig. 3. A trim resistor, RT-INCR, should be connected between the TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of: RTINCR 5.11(100 )VONOM 626 10.22 [k] 1.225 where, RT-INCR = Required value of trim-up resistor k] VO-NOM = Nominal value of output voltage [V] tech.support@psbel.com QM48S40033 5 (VO -REQ VO -NOM) X 100 [k] VO -NOM Vo-REQ = Desired (trimmed) output voltage [V]. When trimming up, care must be taken not to exceed the converter`s maximum allowable output power. See previous section for a complete discussion of this requirement. QmaX TM Vin (+) Series Converter (Top View) Vin ON/OFF Vout (+) SENSE (+) R T-INCR TRIM Rload SENSE (-) Vin (-) Vout (-) Figure 3. Configuration for increasing output voltage. To decrease the output voltage (Fig. 4), a trim resistor, RT-DECR, should be connected between the TRIM (Pin 6) and SENSE (-) (Pin 5), with a value of: RTDECR 511 10.22 [k] || where, RT-DECR Required value of trim-down resistor [k] and is as defined above. Note: The above equations for calculation of trim resistor values match those typically used in conventional industry-standard quarter bricks. For more information see Application Note 103. Vin (+) QmaX TM Series Converter (Top View) Vin ON/OFF Vout (+) SENSE (+) TRIM Rload R T-DECR SENSE (-) Vin (-) Vout (-) Figure 4. Configuration for decreasing output voltage. Trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could cause unwanted triggering of the output over-voltage protection (OVP) circuit. The designer should ensure that the difference between the voltages across the converter's output pins and its sense pins does not exceed 0.33 V, or: [VOUT() VOUT()] [VSENSE() VSENSE()] 0.33 [V] This equation is applicable for any condition of output sensing and/or output trim. Europe, Middle East +353 61 225 977 North America +1 408 785 5200 (c) 2016 Bel Power Solutions & Protection BCD.00793_AB Asia-Pacific +86 755 298 85888 6 QM48S40033 Input under-voltage lockout is standard with this converter. The converter will shut down when the input voltage drops below a pre-determined voltage. The input voltage must be typically 34V for the converter to turn on. Once the converter has been turned on, it will shut off when the input voltage drops typically below 32V. This feature is beneficial in preventing deep discharging of batteries used in telecom applications. The converter is protected against overcurrent or short circuit conditions. Upon sensing an over-current condition, the converter will switch to constant current operation and thereby begin to reduce output voltage. When the output voltage drops below 50% of the nominal value of output voltage, the converter will shut down. Once the converter has shut down, it will attempt to restart nominally every 100 ms with a typical 1-2% duty cycle. The attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output voltage rises above 50% of its nominal value. The converter will shut down if the output voltage across Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of the OVP circuitry. The OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the converter has shut down, it will attempt to restart every 100 ms until the OVP condition is removed. The converter will shut down under an over temperature condition to protect itself from overheating caused by operation outside the thermal derating curves, or operation in abnormal conditions such as system fan failure. After the converter has cooled to a safe operating temperature, it will automatically restart. The converters meet North American and International safety regulatory requirements per UL60950 and EN60950. Basic Insulation is provided between input and output. To comply with safety agencies requirements, an input line fuse must be used external to the converter. A 7.5-A fuse is recommended for use with this product. Modules are UL approved for maximum fuse rating of 15-A. To protect a group of modules with a single fuse, the rating can be increased from the recommended values above. EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics of board mounted component dc-dc converters exist. However, Power Bel Solutions tests its converters to several system level standards, primary of which is the more stringent EN55022, Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement. Effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC. With the addition of a simple external filter, all versions of the QmaXTM Series of converters pass the requirements of Class B conducted emissions per EN55022 and FCC, and meet at a minimum, Class A radiated emissions per EN 55022 and Class B per FCC Title 47CFR, Part 15-J. Please contact Power Bel Solutions Applications Engineering for details of this testing. Figure 5. Location of the thermocouple for thermal testing. tech.support@psbel.com QM48S40033 7 VIN Scenario #1: Initial Startup From Bulk Supply ON/OFF function enabled, converter started via application of VIN. See Figure 6. Time t0 t1 t2 t3 Comments ON/OFF pin is ON; system front-end power is toggled on, VIN to converter begins to rise. VIN crosses Under-Voltage Lockout protection circuit threshold; converter enabled. Converter begins to respond to turn-on command (converter turn-on delay). Converter VOUT reaches 100% of nominal value ON/OFF STATE OFF ON VOUT For this example, the total converter startup time (t3- t1) is typically 4 ms. t0 t1 t2 t t3 Figure 6. Start-up scenario #1. Scenario #2: Initial Startup Using ON/OFF Pin With VIN previously powered, converter started via ON/OFF pin. See Figure 7. Time t0 t1 t2 t3 Comments VINPUT at nominal value. Arbitrary time when ON/OFF pin is enabled (converter enabled). End of converter turn-on delay. Converter VOUT reaches 100% of nominal value. VIN ON/OFF STATE OFF ON For this example, the total converter startup time (t3- t1) is typically 4 ms. VOUT t0 t1 t2 t t3 Figure 7. Startup scenario #2. Scenario #3: Turn-off and Restart Using ON/OFF Pin With VIN previously powered, converter is disabled and then enabled via ON/OFF pin. See Figure 8. Time t0 t1 t2 t3 t4 t5 VIN Comments VIN and VOUT are at nominal values; ON/OFF pin ON. ON/OFF pin arbitrarily disabled; converter output falls to zero; turn-on inhibit delay period (100 ms typical) is initiated, and ON/OFF pin action is internally inhibited. ON/OFF pin is externally re-enabled. If (t2- t1) 100 ms, external action of ON/OFF pin is locked out by startup inhibit timer. If (t2- t1) > 100 ms, ON/OFF pin action is internally enabled. Turn-on inhibit delay period ends. If ON/OFF pin is ON, converter begins turn-on; if off, converter awaits ON/OFF pin ON signal; see Figure 7. End of converter turn-on delay. Converter VOUT reaches 100% of nominal value. For the condition, (t2- t1) 100 ms, the total converter startup time (t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, startup will be typically 4 ms after release of ON/OFF pin. 100 ms ON/OFF STATE OFF ON VOUT t0 t1 t2 t3 t4 t t5 Figure 8. Startup scenario #3. Europe, Middle East +353 61 225 977 North America +1 408 785 5200 (c) 2016 Bel Power Solutions & Protection BCD.00793_AB Asia-Pacific +86 755 298 85888 QM48S40033 8 The converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for vertical and horizontal mounting, efficiency, start-up and shutdown parameters, output ripple and noise, transient response to load step-change, overload and short circuit. The following pages contain specific plots or waveforms associated with the converter. Additional comments for specific data are provided below. All data presented were taken with the converter soldered to a test board, specifically a 0.060" thick printed wiring board (PWB) with four layers. The top and bottom layers were not metalized. The two inner layers, comprising two-ounce copper, were used to provide traces for connectivity to the converter. The lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the PWB was minimized. This provides a worst-case but consistent scenario for thermal derating purposes. All measurements requiring airflow were made in Power Bel Solutions vertical and horizontal wind tunnel facilities using Infrared (IR) thermography and thermocouples for thermometry. Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in the application. Thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. Power Bel Solutions recommends the use of AWG #40 gauge thermocouples to ensure measurement accuracy. Careful routing of the thermocouple leads will further minimize measurement error. Refer to Figure 5 for optimum measuring thermocouple location. Load current vs. ambient temperature and airflow rates are given in Figs. 17 and 18 for vertical and horizontal converter mounting. Ambient temperature was varied between 25C and 85C, with airflow rates from 30 to 500 LFM (0.15 to 2.5 m/s). For each set of conditions, the maximum load current was defined as the lowest of: (i) The output current at which any FET junction temperature does not exceed a maximum specified temperature (120C) as indicated by the thermographic image, or (ii) The nominal rating of the converter (40 A). During normal operation, derating curves with maximum FET temperature less than or equal to 120C should not be exceeded. Temperature on the PCB at the thermocouple location shown in Fig. 5 should not exceed 118C in order to operate inside the derating curves. 4.4 Fig. 11 shows the efficiency vs. load current plot for ambient temperature of 25C, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and input voltages of 36 V, 48 V and 72 V. Also, a plot of efficiency vs. load current, as a function of ambient temperature with Vin = 48 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. 12. Fig. 13 shows the power dissipation vs. load current plot for Ta = 25C, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and input voltages of 36 V, 48 V and 72 V. Also, a plot of power dissipation vs. load current, as a function of ambient temperature with Vin = 48 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. 14. Output voltage waveforms, during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are shown without and with external load capacitance in Fig. 15 and Fig. 16, respectively. tech.support@psbel.com QM48S40033 9 50 50 40 40 Load Current [Adc] Load Current [Adc] Fig. 18 shows the output voltage ripple waveform, measured at full rated load current with a 10 F tantalum and 1 F ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1 F ceramic capacitor. The input reflected ripple current waveforms are obtained using the test setup shown in Fig. 19. The corresponding waveforms are shown in Fig. 20 and Fig. 21. 30 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 20 10 30 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 20 10 0 0 20 30 40 50 60 70 80 20 90 30 40 Figure 9. Available load current vs. ambient air temperature and airflow rates for QM48S40033 converter mounted vertically with air flowing from pin 3 to pin 1, MOSFET temperature 120 C, Vin = 48 V. 60 70 80 90 Figure 10. Available load current vs. ambient air temperature and airflow rates for QM48S40033 converter mounted horizontally with air flowing from pin 3 to pin 1, MOSFET temperature 120 C, Vin = 48 V. 0.95 0.95 0.90 0.90 0.85 0.85 Efficiency Efficiency 50 Ambient Temperature [C] Ambient Temperature [C] 0.80 0.75 72 V 48 V 36 V 0.80 0.75 0.70 70 C 55 C 40 C 0.70 0.65 0.65 0 10 20 30 40 50 0 Load Current [Adc] 10 20 30 40 50 Load Current [Adc] Figure 11. Efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 C. Figure 12. Efficiency vs. load current and ambient temperature for converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). Europe, Middle East +353 61 225 977 North America +1 408 785 5200 (c) 2016 Bel Power Solutions & Protection BCD.00793_AB Asia-Pacific +86 755 298 85888 QM48S40033 16.00 16.00 12.00 12.00 Power Dissipation [W] Power Dissipation [W] 10 8.00 72 V 48 V 36 V 4.00 0.00 8.00 70 C 55 C 40 C 4.00 0.00 0 10 20 30 40 50 Load Current [Adc] 0 10 20 30 40 50 Load Current [Adc] Figure 13. Power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and C. Figure 14. Power dissipation vs. load current and ambient temperature for converter mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). Figure 15. Turn-on transient at full rated load current (resistive) with no out-put capacitor at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage (1 V/div.) Time scale: 2 ms/div. Figure 16. Turn-on transient at full rated load current (resistive) plus 40,000 F at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage (1 V/div.). Time scale: 2 ms/div. Figure 17. Output voltage response to load current stepchange (20 A - 30 A - 20 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div). Current slew rate: 1 A/s. Co = 470 F tantalum + 1 F ceramic. Time scale: 0.2 ms/div. Figure 18. Output voltage ripple (20 mV/div.) at full rated load current into a resistive load with Co = 10 F tantalum + 1F tech.support@psbel.com QM48S40033 11 iS iC 10 H source inductance Vsource 33 F ESR <1 electrolytic capacitor QmaX TM Series DC/DC Converter 1 F ceramic Vout capacitor Figure 19. Test setup for measuring input reflected ripple currents, ic and is. Figure 20. Input reflected ripple current, is (10 mA/div), current and Vin = 48 V. Refer to Fig. 19 for test setup. Time Figure 21. Input reflected ripple current, ic (100 mA/div), measured at in-put terminals at full rated load current and Vin = 48 V. Refer to Fig. 19 for test setup. Time scale: 1 s/div. 4.0 Vout [Vdc] 3.0 2.0 1.0 0 0 15 30 45 60 Iout [Adc] Figure 22. Output voltage vs. load current showing current limit point and converter shutdown point. Input voltage has almost no effect on current limit characteristic. Figure 23. Load current (top trace, 20 A/div, 20 ms/div) into a 10 m short circuit during restart, at Vin = 48 V. Bottom trace (20 A/div, 1 ms/div) is an expansion of the on-time portion of the top trace. Europe, Middle East +353 61 225 977 North America +1 408 785 5200 (c) 2016 Bel Power Solutions & Protection BCD.00793_AB Asia-Pacific +86 755 298 85888 QM48S40033 12 PAD/PIN CONNECTIONS * * * * * Input Voltage Mounting Scheme Rated Load Current Output Voltage QM 48 S 40 033 QuarterBrick Format 36-75 V Surface Mount 40 A 033 3.3 V - Function 1 Vin (+) 2 ON/OFF 3 Vin (-) 4 Vout (-) 5 SENSE (-) 6 TRIM 7 SENSE (+) 8 Vout (+) All dimensions are in inches [mm] Connector Material: Copper Connector Finish: Gold over Nickel Converter Weight: 1.06oz [30 g] Recommended Surface-Mount Pads: Min. 0.080" X 0.112" [2.03 x 2.84] Max. 0.092" X 0.124" [2.34 x 3.15] * * Product Series Pad/Pin # ON/OFF Logic Maximum Height [HT] Pin Length [PL] Special Features RoHS N S 0 0 G N Negative P Positive S 0.295" 0 0.00" 0 STD No Suffix RoHS lead-solderexemption compliant G RoHS compliant for all six substances The example above describes P/N QM48S40033-NS00G: 36-75 V input, surface mount, 40 A @ 3.3 V output, negative ON/OFF logic, maximum height of 0.295" and RoHS compliant for all six substances. Please consult factory regarding availability of a specific version. NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. tech.support@psbel.com