78253J Series MAX253 Compatible Converter SM Transformers SELECTION GUIDE Output Max. Output Isolation Input Voltage Turns Order Code Voltage Current Voltage 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 n J-STD-020D reflow 78253/XXJ(V)C 6 Pin SM Tube 50 78253/XXJ(V)C-R 6 Pin SM Tape & Reel 500 n RoHS compliant 78253/35JC CHARACTERISTICS n Maxim MAX253 compatible Parameter Conditions Min. Typ. Max. Units n 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 n Isolation to 4kVDC S Leakage Inductance, L 100kHz, 250mV 0.32 1.00 H L n Frequency range to 500kHz Interwinding Capacitance, C 100kHz, 250mV 24 50 pF WW Primary D.C. Resistance, R >0.1VDC 0.5 1.00 n Toroidal construction DC Volt-time Product, Et Pins 1/2 or 2/3 30 49 Vs n Industry-standard pinout 78253/55JC CHARACTERISTICS n UL 94 V-0 package materials Parameter Conditions Min. Typ. Max. Units n Low profile 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 n 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 specifically 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 Primary D.C. Resistance, R >0.1VDC 0.30 0.50 For through hole versions see 78253 series 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 specifications 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 2014-06-10 KMP 78253JC A03 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 1500VDC Isolation voltage 78253/XXJC (flash tested for 1 second) 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 Primary Secondary 1 6 0.354 2 5 (9.0) MAX 78253/55JC 3 4 XYYWW 0.25 (6.35) 0.012 (0.30) 0.035 0.025 (0.63) 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 0.10 (2.54) 0.06 (1.60) 0.10 (2.54) 0.10 (2.54) +0.006 (0.15) 0.05 (1.20) -0.000 (0.00) 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 2014-06-10 KMP 78253JC A03 Page 2 of 5