78253J Series MAX253 Compatible Converter SM Transformers SELECTION GUIDE Output Max. Output Isolation Input Voltage Turns Voltage Current Voltage Order Code Ratio V V mA VDC 78253/35JC 3.3 5.0 100 1500 1:2.27 78253/55JC 5.0 5.0 200 1500 1:1.31 78253/35JVC 3.3 5.0 100 4000 1:2.14 78253/55JVC 5.0 5.0 200 4000 1:1.33 ORDER CODE DETAILS FEATURES Order Code Package Type Packaging Type Quantity J-STD-020D reow 78253/XXJ(V)C 6 Pin SM Tube 50 78253/XXJ(V)C-R 6 Pin SM Tape & Reel 500 RoHS compliant 78253/35JC CHARACTERISTICS Maxim MAX253 compatible Parameter Conditions Min. Typ. Max. Units 3.3V and 5V versions Primary Inductance, L 100kHz, 250mV 0.27 0.36 0.50 mH P Secondary Inductance, L 100kHz, 250mV 1.60 2.00 2.40 mH Isolation to 4kVDC S Leakage Inductance, L 100kHz, 250mV 0.32 1.00 H L Frequency range to 500kHz Interwinding Capacitance, C 100kHz, 250mV 24 50 pF WW Primary D.C. Resistance, R >0.1VDC 0.5 1.00 Toroidal construction DC Volt-time Product, Et Pins 1/2 or 2/3 30 49 Vs Industry-standard pinout 78253/55JC CHARACTERISTICS UL 94 V-0 package materials Parameter Conditions Min. Typ. Max. Units Low prole Primary Inductance, L 100kHz, 250mV 0.57 0.83 1.10 mH P Secondary Inductance, L 100kHz, 250mV 1.10 1.40 1.70 mH Industrial temperature range S Leakage Inductance, L 100kHz, 250mV 0.51 1.00 H L Interwinding Capacitance, C 100kHz, 250mV 30 50 pF WW DESCRIPTION Primary D.C. Resistance, R >0.1VDC 0.70 1.50 DC Volt-time Product, Et Pins 1/2 or 2/3 40 70 Vs The 78253 series of converter transformers are specically designed for use with the MAX253 78253/35JVC CHARACTERISTICS chip set to provide isolated power supplies. The Parameter Conditions Min. Typ. Max. Units 5V input version can supply 1W and the 3.3V Primary Inductance, L 100kHz, 20mV 110 142 203 H P input version can supply 500mW. A centre tapped Secondary Inductance, L 100kHz, 20mV 550 710 850 H S secondary winding allows for full bridge, half Leakage Inductance, L 100kHz, 250mV 3.46 5.00 H L bridge or voltage doubling. Interwinding Capacitance, C 100kHz, 250mV 2 8.00 pF WW For through hole versions see 78253 series Primary D.C. Resistance, R >0.1VDC 0.30 0.50 DC datasheet. Volt-time Product, Et Pins 1/2 or 2/3 18 30 Vs 78253/55JVC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, L 100kHz, 20mV 170 240 335 H P Secondary Inductance, L 100kHz, 20mV 350 444 540 H S Leakage Inductance, L 100kHz, 250mV 6.28 8.00 H L Interwinding Capacitance, C 100kHz, 250mV 3.4 8.00 pF WW Primary D.C. Resistance, R >0.1VDC 0.40 0.60 DC Volt-time Product, Et Pins 1/2 or 2/3 25 37 Vs All specications typical at T =25C A 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 578253J Series MAX253 Compatible Converter SM Transformers ABSOLUTE MAXIMUM RATINGS Operating free air temperature range -40C to 85C Storage temperature range -50C to 125C 400mA Peak current I PK Isolation voltage 78253/XXJC (ash tested for 1 second) 1500VDC Isolation voltage 78253/XXJVC (ash tested for 1 second) 4000VDC PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS 0.5 (12.70) 0.375 (9.52) MAX Top View Primary Secondary 1 6 0.354 2 5 (9.0) MAX 78253/55JC 3 4 XYYWW 0.25 (6.35) 0.012 (0.30) 0.025 (0.63) 0.035 0.008 (0.20) (0.90) 0.021 (0.53) 0.1 (2.54) 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