78253 Series www.murata-ps.com MAX253 Compatible Converter Transformers SELECTION GUIDE Output Max. Output Isolation Input Voltage Turns Package Order Code Voltage Current Voltage Ratio Style V V mA VDC 78253/35C DIL 3.3 5.0 100 1500 1:2.27 78253/35MC SM 78253/55C DIL 5.0 5.0 200 1500 1:1.31 78253/55MC SM 78253/35VC DIL 3.3 5.0 100 4000 1:2.14 78253/35MVC SM FEATURES 78253/55VC DIL 5.0 5.0 200 4000 1:1.33 n RoHS compliant 78253/55MVC SM n Maxim MAX253 compatible ORDER CODE DETAILS n 3.3V and 5V versions Order Code Package Type Packaging Type Quantity 78253/XX(V)C 6 Pin DIL Tube 50 n Isolation to 4kVDC 78253/XXM(V)C 6 Pin SM Tube 50 n Frequency range to 500kHZ 78253/XXM(V)C-R 6 Pin SM Tape & Reel 500 n Toroidal construction 78253/35(M)C CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units n Industry-standard pinout Primary Inductance, L 100kHz, 250mV 0.30 0.38 0.46 mH P n UL 94 V-0 package materials Secondary Inductance, L 100kHz, 250mV 1.60 2.00 2.40 mH S n Fully encapsulated Leakage Inductance, L 100kHz, 250mV 0.30 1.00 H L Interwinding Capacitance, C 100kHz, 250mV 30 50 pF WW n Low profile Primary D.C. Resistance, R >0.1VDC 0.40 1.00 DC n Surface mount option Volt-time Product, Et Pins 1/2 or 2/3 30 35 Vs n Industrial temperature range 78253/55(M)C CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, L 100kHz, 250mV 0.60 0.83 1.10 mH P DESCRIPTION Secondary Inductance, L 100kHz, 250mV 1.10 1.40 1.70 mH S The 78253 series of converter transformers are Leakage Inductance, L 100kHz, 250mV 0.35 1.00 H L specifically designed for use with the MAX253 Interwinding Capacitance, C 100kHz, 250mV 30 50 pF WW chip set to provide isolated power supplies. The Primary D.C. Resistance, R >0.1VDC 0.70 1.50 DC 5V version can supply 1W and the 3.3V version Volt-time Product, Et Pins 1/2 or 2/3 40 50 Vs can supply 500mW. A centre tapped secondary 78253/35(M)VC CHARACTERISTICS winding allows for full bridge, half bridge or Parameter Conditions Min. Typ. Max. Units voltage doubling. Primary Inductance, L 100kHz, 20mV 110 142 185 H P Secondary Inductance, L 100kHz, 20mV 550 710 850 H S Surface-mount parts Leakage Inductance, L 100kHz, 250mV 3.00 5.00 H L The surface-mount (M suffix) products are not Interwinding Capacitance, C 100kHz, 250mV 4.20 8.00 pF WW Primary D.C. Resistance, R >0.1VDC 0.30 0.50 recommended for new designs. For existing designs, DC Volt-time Product, Et Pins 1/2 or 2/3 18 22 Vs however, Murata Power Solutions will continue to manufacture and fully support these parts. 78253/55(M)VC CHARACTERISTICS For recommended alternatives please refer to the Parameter Conditions Min. Typ. Max. Units 78253J Series datasheet. Primary Inductance, L 100kHz, 20mV 190 240 310 H P Secondary Inductance, L 100kHz, 20mV 350 444 540 H S Leakage Inductance, L 100kHz, 250mV 5.20 8.00 H L Interwinding Capacitance, C 100kHz, 250mV 4.20 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 28 Vs All specifications typical at T =25C A For full details go to For full details go towww.cd4power.com/rohs www.murata-ps.com/rohs www.murata-ps.com/support KMP 78253C D05 Page 1 of 578253 Series MAX253 Compatible Converter Transformers ABSOLUTE MAXIMUM RATINGS Operating free air temperature range -40C to 85C Storage temperature range -50C to 125C 300C Lead Temperature 1.5mm from case for 10 seconds 400mA Peak current I PK 1500VDC Isolation voltage 78253/XX(M)C (flash tested for 1 second) Isolation voltage 78253/XX(M)VC (flash tested for 1 second) 4000VDC PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS 6 Pin DIL 6 Pin SM 0.5 (12.70) 0.375 0.375 (9.52) MAX (9.52) MAX Top View Top View Primary Secondary Primary Secondary 1 6 1 6 0.354 0.354 2 2 5 5 (9.0) MAX (9.0) MAX 78253/35C 78253/55MC 3 4 3 4 XYYWW XYYWW 0.25 0.25 (6.35) (6.35) 0.1350.02 0.012 0.30 0.035 0.025 (0.63) (3.440.50) (0.008 0.20) (0.90) 0.021 (0.53) 0.1 0.012(0.30) 0.025 (0.63) (2.54) 0.008(0.20) 0.021 (0.53) 0.40 0.1 (2.54) (10.16) 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 6 Pin DIL 6 Pin SM 0.10 (2.54) 0.10 (2.54) 0.06 (1.60) 0.06 (1.60) 0.10 (2.54) 0.10 (2.54) 0.10 (2.54) 0.10 (2.54) +0.006 (0.15)+0.006 (0.15) 0.05 (1.20) 0.05 (1.20) -0.000 (0.00)-0.000 (0.00) 0.04 0.04 (1.00) (1.00) 0.45 0.45 (11.50) (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 KMP 78253C D05 Page 2 of 5