SLVU2.8K - 4U LOW VOLTAGE UNIDIRECTIONAL TVSarray TM SCOTTSDALE DIVISION APPEARANCE The SLVU2.8K-4U provides 500 Watt protection with LOW CAPACITANCE, LOW CLAMPING VOLTAGE and the LOWEST LEAKAGE in the industry for two lines to ground (common mode). Low unidirectional capacitance of 10 pF for each line and low standby current provides a more stable signal in higher frequency applications and at lower operating voltages of 2.8 volts. Negative transients on each line are also clamped to very low voltages with an anti-parallel forward diode in each leg (line to ground). The SLVU2.8K-4U is designed for use in applications where protection is required at the board level from voltage transients caused by electrostatic discharge (ESD) as defined in IEC 61000-4-2, electrical fast transients (EFT) per IEC 61000-4-4 and effects of secondary lightning. These arrays are used to protect two lines by connecting both pins 1 and 8 to line 1 and pins 4 and 5 to line 2. Pins 2 and 7 as well as pins 3 and 6 are all connected to ground as shown in Figures 3, 4 and 5. WWW . Microsemi .C OM DESCRIPTION IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com FEATURES * * * * * * APPLICATIONS / BENEFITS Protects 2 unidirectional lines to ground with very low clamping voltage including opposite (negative) transients on each line with a forward biased diode Provides electrically-isolated protection Low operating voltage: 2.8 volts Low capacitance of 10 pF Low standby current Low clamping voltage with minimal voltage overshoot * * * * * * * EIA-RS232 data rate: 19.6 kbs EIA-RS422 data rate: 10 Mbs EIA-RS423 data rate: 100 kbs 10 / 100 Ethernet WAN / LAN Equipment Lowest standby (leakage) current in the industry Very low parasitic inductance resulting in minimal voltage overshoot (Ldi/dt) effects * Negative transients minimized that could damage CMOS transceivers MAXIMUM RATINGS * * * MECHANICAL AND PACKAGING * Molded SO-8 Surface Mount * UL 94V-0 Flammability Classification * Weight 0.066 grams (approximate) * Marking: Logo, device marking code, date code * Pin #1 defined by dot on top of package * Tape & Reel per EIA Standard 481-1-A * 13 inch reel; 2,500 pieces (STANDARD) * Carrier tubes; 95 pcs (OPTIONAL) Operating Temperature: -55C to +150C Storage Temperature: -55C to +150C Peak Pulse Power: 500 watts (8/20 s, Figure 1 and Figure 2) ELECTRICAL CHARACTERISTICS PER LINE @ 25C Unless otherwise specified SNAP-BACK VOLTAGE VSB STANDBY CURRENT ID CLAMPING VOLTAGE VC CLAMPING VOLTAGE VC CLAMPING VOLTAGE VC CAPACITANCE (f=1 MHz) * C PART NUMBER IPT = 2 A ISB = 50 mA VWM = 2.8V VOLTS VOLTS A IPP = 5 A (Figure 2) VOLTS IPP = 24 A (Figure 2) VOLTS @ 0V VOLTS IPP = 2 A (Figure 2) VOLTS SLVU2.8K-4U MAX MIN MIN MAX MAX MAX MAX TYP 2.8 3.0 2.8 0.1 5.5 8.5 15 10 DEVICE MARKING CODE 2.8K4U pF * Capacitance line-to-ground is 10 pF typical (including anti-parallel diode for negative transients and low clamping voltage). Note: Transient Voltage Suppressor (TVS) product is normally selected based on its stand off voltage VWM. Product selected voltage should be equal to or greater than the continuous peak operating voltage of the circuit to be protected. Copyright 2003 MSCXXXX.PDF 10-6-2003 REV 0 Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 1 SLVU2.8K - 4U PUNCH-THRU VOLTAGE VPT STANDOFF VOLTAGE VWM SLVU2.8K - 4U LOW VOLTAGE UNIDIRECTIONAL TVSarray TM SCOTTSDALE DIVISION Symbol VWM VPT VSB DEFINITION Standoff Voltage: Maximum dc voltage that can be applied over the operating temperature range. VWM must be selected to be equal or be greater than the operating voltage of the line to be protected. Punch-Thru Voltage: The minimum voltage the device will exhibit at a specified current ID Snap-Back Voltage: The minimum snap-back voltage the device will exhibit at a specified current Clamping Voltage: Maximum clamping voltage across the TVS device when subjected to a given current at a pulse time of 20 s. Standby Current: Current at VWM. C Capacitance: Capacitance of the TVS as defined @ 0 volts at a frequency of 1 MHz and stated in picofarads. VC WWW . Microsemi .C OM SYMBOLS & DEFINITIONS GRAPHS PPP - Peak Pulse Power (W) 8/20 s 500W Pulse Pulse Time t=sec FIGURE 1 Peak Pulse Power vs. Pulse Time FIGURE 2 Pulse Wave Form SLVU2.8K - 4U Copyright 2003 MSCXXXX.PDF 10-6-2003 REV 0 Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 2 SLVU2.8K - 4U LOW VOLTAGE UNIDIRECTIONAL TVSarray TM SCOTTSDALE DIVISION WWW . Microsemi .C OM SCHEMATIC FIGURE 4 Circuit Board Layout FIGURE 3 Common Mode Configuration FIGURE 5 Schematic PACKAGE DIMENSIONS and PAD LAYOUT + PAD LAYOUT MILLIMETERS MIN MAX 4.77 5.00 3.81 4.01 1.35 1.75 0.28 0.53 0.41 1.27 1.27 BSC 0.15 0.25 0.10 0.20 4.80 5.23 5.79 6.19 SLVU2.8K - 4U DIM A B C D F G J K L P INCHES MIN MAX 0.188 0.197 0.150 0.158 .053 .069 + .011 .021 .016 .050 .050 BSC .006 .010 .004 .008 .189 .206 .228 .244 OUTLINE Copyright 2003 MSCXXXX.PDF 10-6-2003 REV 0 Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 3