78253J Series MAX253 Compatible Converter SM Transformers SELECTION GUIDE Order Code 78253/35JC 78253/55JC 78253/35JVC 78253/55JVC V Output Voltage V Max. Output Current mA Isolation Voltage VDC Turns Ratio 3.3 5.0 3.3 5.0 5.0 5.0 5.0 5.0 100 200 100 200 1500 1500 4000 4000 1:2.27 1:1.31 1:2.14 1:1.33 Input Voltage ORDER CODE DETAILS FEATURES J-STD-020D reflow RoHS compliant Maxim MAX253 compatible 3.3V and 5V versions Isolation to 4kVDC Frequency range to 500kHz Toroidal construction Industry-standard pinout UL 94 V-0 package materials Low profile Industrial temperature range DESCRIPTION The 78253 series of converter transformers are specifically designed for use with the MAX253 chip set to provide isolated power supplies. The 5V input version can supply 1W and the 3.3V input version can supply 500mW. A centre tapped secondary winding allows for full bridge, half bridge or voltage doubling. For through hole versions see 78253 series datasheet. Order Code 78253/XXJ(V)C 78253/XXJ(V)C-R Package Type 6 Pin SM 6 Pin SM Packaging Type Tube Tape & Reel Quantity 50 500 78253/35JC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP Secondary Inductance, LS Leakage Inductance, LL Interwinding Capacitance, CWW Primary D.C. Resistance, RDC Volt-time Product, Et 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV >0.1VDC Pins 1/2 or 2/3 0.27 1.60 0.36 2.00 0.32 24 0.5 49 0.50 2.40 1.00 50 1.00 mH mH H pF 30 Vs 78253/55JC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP Secondary Inductance, LS Leakage Inductance, LL Interwinding Capacitance, CWW Primary D.C. Resistance, RDC Volt-time Product, Et 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV >0.1VDC Pins 1/2 or 2/3 0.57 1.10 1.10 1.70 1.00 50 1.50 mH mH H pF 40 0.83 1.40 0.51 30 0.70 70 Vs 78253/35JVC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP Secondary Inductance, LS Leakage Inductance, LL Interwinding Capacitance, CWW Primary D.C. Resistance, RDC Volt-time Product, Et 100kHz, 20mV 100kHz, 20mV 100kHz, 250mV 100kHz, 250mV >0.1VDC Pins 1/2 or 2/3 110 550 203 850 5.00 8.00 0.50 H H H pF 18 142 710 3.46 2 0.30 30 Vs 78253/55JVC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP Secondary Inductance, LS Leakage Inductance, LL Interwinding Capacitance, CWW Primary D.C. Resistance, RDC Volt-time Product, Et 100kHz, 20mV 100kHz, 20mV 100kHz, 250mV 100kHz, 250mV >0.1VDC Pins 1/2 or 2/3 170 350 240 444 6.28 3.4 0.40 37 335 540 8.00 8.00 0.60 H H H pF 25 Vs All specifications typical at TA=25C For full details go to www.murata-ps.com/rohs www.murata-ps.com/support Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232 2018-05-11 KMP_78253JC_A04 Page 1 of 5 78253J Series MAX253 Compatible Converter SM Transformers ABSOLUTE MAXIMUM RATINGS Operating free air temperature range -40C to 85C Storage temperature range -50C to 125C Peak current IPK 400mA Isolation voltage 78253/XXJC (flash tested for 1 second) 1500VDC Isolation voltage 78253/XXJVC (flash tested for 1 second) 4000VDC PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS 0.5 (12.70) 0.375 (9.52) MAX Top View 1 0.354 (9.0) MAX 78253/55JC XYYWW Primary Secondary 6 2 5 3 4 0.25 (6.35) 0.012 (0.30) 0.008 (0.20) 0.035 (0.90) 0.1 (2.54) 0.025 (0.63) 0.021 (0.53) Unless otherwise stated all dimensions in inches (mm) 0.01 (0.25). All pins on a 0.1 (2.54) pitch and within 0.01 (0.25) of true position. Package weight 1.0g Typ. RECOMMENDED FOOTPRINT DETAILS 0.06 (1.60) 0.10 (2.54) 0.04 (1.00) 0.45 (11.50) Unless otherwise stated all dimensions in inches (mm) 0.01 (0.25). All pins on a 0.1 (2.54) pitch and within 0.01 (0.25) of true position. www.murata-ps.com/support Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232 2018-05-11 KMP_78253JC_A04 Page 2 of 5 78253J Series MAX253 Compatible Converter SM Transformers TYPICAL CHARACTERISTICS (VOLTAGE CURVES) VOLTAGE CURVES 78253/35JC 10 8 Output Voltage (V) Output Voltage (V) 8 6 4 2 0 80 40 60 100 Output Current (mA) 20 0 6 4 2 0 120 78253/35JVC 10 0 100 300 200 Output Current (mA) 400 78253/55JVC 10 8 8 Output Voltage (V) Output Voltage (V) 78253/55JC 10 6 4 2 0 20 0 80 40 60 Output Current (mA) 6 4 2 0 100 100 0 200 300 Output Current (mA) 400 EFFICIENCY CURVES 78253/35JC 100 80 60 Efficiency (%) Efficiency (%) 80 40 0 20 80 40 60 Output Current (mA) 0 100 200 300 Output Current (mA) 400 78253/55JVC 100 80 80 Efficiency (%) Efficiency (%) 40 0 100 120 78253/35JVC 100 60 40 60 40 20 20 0 60 20 20 0 78253/55JC 100 0 20 40 60 Output Current (mA) 80 100 0 0 200 100 300 Output Current (mA) 400 All curves are derived from testing with the Maxim MAX235 IC using the circuit shown in application note MPAN-03 ( download at http://www.murata-ps.com/data/apnotes/mpan-03.pdf). www.murata-ps.com/support Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232 2018-05-11 KMP_78253JC_A04 Page 3 of 5 78253J Series MAX253 Compatible Converter SM Transformers TYPICAL CHARACTERISTICS (VOLTAGE CURVES) continued VOLTAGE DEVIATION 78253/35JC 105 100 95 90 -50 -25 75 100 78253/35JVC 105 100 95 90 -50 -25 50 0 25 Temperature (C) 75 100 TECHNICAL NOTES ISOLATION VOLTAGE `Hi Pot Test', `Flash Tested', `Withstand Voltage', `Proof Voltage', `Dielectric Withstand Voltage' & `Isolation Test Voltage' are all terms that relate to the same thing, a test voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. All products in this series are 100% production tested at their stated isolation voltage. A question commonly asked is, "What is the continuous voltage that can be applied across the part in normal operation?" For a part holding no specific agency approvals both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard requirements. 105 100 95 90 -50 -25 50 0 25 Temperature (C) 75 100 75 100 78253/55JVC 110 Voltage Deviation from Nominal 25C Output (%) 110 Voltage Deviation from Nominal 25C Output (%) 50 0 25 Temperature (C) 78253/55JC 110 Voltage Deviation from Nominal 25C Output (%) Voltage Deviation from Nominal 25C Output (%) 110 105 100 95 90 -50 -25 25 50 0 Temperature (C) SOLDERING INFORMATION1 REPEATED HIGH-VOLTAGE ISOLATION TESTING It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. This series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled wire. While parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage. This consideration equally applies to agency recognised parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. www.murata-ps.com/support Pin finish Max. peak reflow temperature Moisture sensitivity level2 Max. time above liquidous (217C) Matte tin 245C 1 100s TUBE OUTLINE DIMENSIONS 0.43 (10.95) 0.16 (4.00) 0.0230.005 (0.600.15) 0.51 (12.95) 0.22 (5.50) 0.15 (3.80) 0.62 (15.70) Tube length: 18.30.08 (4652). Tube quantity: 50. Tube material: Antistatic coated clear pvc. Unless otherwise stated all dimensions in inches(mm) 0.01 (0.25). All specifications typical at TA=25C 1 For further information, please visit www.murata-ps.com/rohs 2 Representative samples of the product were subjected to the conditioning described in IPC/JEDEC J-STD-020D and passed electrical testing, package coplanarity and visual inspection which revealed no external cracks or changes in package body flatness. Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232 2018-05-11 KMP_78253JC_A04 Page 4 of 5 78253J Series MAX253 Compatible Converter SM Transformers TAPE & REEL SPECIFICATIONS REEL OUTLINE DIMENSIONS 2.36 (60) Min. O15.039 (382) Max. 0.94-1.08 (23.9-27.4)* O 0.53 (13.50) 0.50 (12.80) Leader section 15.7 (400) Min. 3.9 (100) Min. 0.059 (1.50) Min. 1.20 (30.4) Max.g Goods enclosure section 0.96 (24.4)g 1.04 (26.4) Trailer section 6.3 (160) Min. Reel quantity: 500 Unless otherwise stated all dimensions in inches (mm) 0.01(0.25). O 0.80 (20.20) Min. * Includes flange distortion at outer edge. g Measured at hub. TAPE OUTLINE DIMENSIONS 0.157 (4.00) Cover tape 0.283 (7.20) 78253 35JC 0.453 (11.50) +0.004 +0.10 0.059 -0.000 (1.50 -0.00 ) 0.079 (2.00) XYYWW +0.012 +0.30 0.945 -0.004 (24.00 -0.10 ) 0.069 (1.75) 0.369 (9.37) 0.472 (12.00) 0.024 (0.60) Max. Direction of unreeling Unless otherwise stated all dimensions in inches (mm) 0.01(0.25). This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2018 Murata Power Solutions, Inc. www.murata-ps.com/support Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232 2018-05-11 KMP_78253JC_A04 Page 5 of 5