78253 Series www.murata-ps.com MAX253 Compatible Converter Transformers SELECTION GUIDE Order Code 78253/35C 78253/35MC 78253/55C 78253/55MC 78253/35VC 78253/35MVC 78253/55VC 78253/55MVC FEATURES n RoHS compliant n Maxim MAX253 compatible n 3.3V and 5V versions n Isolation to 4kVDC n Frequency range to 500kHZ V Output Voltage V Max. Output Current mA Isolation Voltage VDC Turns Ratio 3.3 5.0 100 1500 1:2.27 5.0 5.0 200 1500 1:1.31 3.3 5.0 100 4000 1:2.14 5.0 5.0 200 4000 1:1.33 Input Voltage Package Style DIL SM DIL SM DIL SM DIL SM ORDER CODE DETAILS Order Code 78253/XXC 78253/XXMC 78253/XXMC-R Package Type 6 Pin DIL 6 Pin SM 6 Pin SM Packaging Type Tube Tube Tape & Reel Quantity 50 50 500 n Toroidal construction 78253/35(M)C CHARACTERISTICS n Industry-standard pinout Parameter Conditions Min. Typ. Max. Units n UL 94 V-0 package materials 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV >0.1VDC Pins 1/2 or 2/3 0.30 1.60 0.38 2.00 0.30 30 0.40 35 0.46 2.40 1.00 50 1.00 mH mH μH pF n Surface mount option Primary Inductance, LP Secondary Inductance, LS Leakage Inductance, LL Interwinding Capacitance, CWW Primary D.C. Resistance, RDC Volt-time Product, Et n Industrial temperature range 78253/55(M)C CHARACTERISTICS n Fully encapsulated n Low profile DESCRIPTION The 78253 series of converter transformers are specifically designed for use with the MAX253 chip set to provide isolated power supplies. The 5V version can supply 1W and the 3.3V version can supply 500mW. A centre tapped secondary winding allows for full bridge, half bridge or voltage doubling. Surface-mount parts The surface-mount (M suffix) products are not recommended for new designs. For existing designs, however, Murata Power Solutions will continue to manufacture and fully support these parts. For recommended alternatives please refer to the 78253J Series datasheet. 30 Ω Vμs 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 0.60 1.10 1.10 1.70 1.00 50 1.50 mH mH μH pF 40 0.83 1.40 0.35 30 0.70 50 Ω Vμs 78253/35(M)VC 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 2/3 110 550 185 850 5.00 8.00 0.50 μH μH μH pF 18 142 710 3.00 4.20 0.30 22 Ω Vμs 78253/55(M)VC 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 2/3 190 350 240 444 5.20 4.20 0.40 28 310 540 8.00 8.00 0.60 μH μH μH pF 25 Ω Vμs All specifications typical at TA=25°C For full details go to For full details go to www.cd4power.com/rohs www.murata-ps.com/rohs www.murata-ps.com/support KMP_78253C_D04 Page 1 of 5 78253 Series MAX253 Compatible Converter Transformers ABSOLUTE MAXIMUM RATINGS Operating free air temperature range -40°C to 85°C Storage temperature range -50°C to 125°C Lead Temperature 1.5mm from case for 10 seconds 300°C Peak current IPK 400mA Isolation voltage 78253/XX(M)C (flash tested for 1 second) 1500VDC Isolation voltage 78253/XX(M)VC (flash tested for 1 second) 4000VDC PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS 6 Pin DIL 6 Pin SM 0.375 (9.52) MAX Top View 1 0.354 (9.0) MAX 78253/35C XYYWW 0.5 (12.70) 0.375 (9.52) MAX Primary 2 Secondary 6 1 0.354 (9.0) MAX 5 4 3 78253/55MC XYYWW Primary Secondary 6 2 5 3 4 0.25 (6.35) 0.25 (6.35) 0.012 0.30 (0.008 0.20) 0.135±0.02 (3.44±0.50) 0.012(0.30) 0.008(0.20) Top View 0.40 (10.16) 0.035 (0.90) 0.1 (2.54) 0.025 (0.63) 0.021 (0.53) 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 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) (0.15)+0.006 (0.15) Ø0.05 (1.20) +0.006 Ø0.05 (1.20) -0.000 (0.00) -0.000 (0.00) 0.04 (1.00) 0.04 (1.00) 0.45 (11.50) 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 KMP_78253C_D04 Page 2 of 5 78253 Series MAX253 Compatible Converter Transformers TYPICAL CHARACTERISTICS (VOLTAGE CURVES) VOLTAGE CURVES 78253/35(M)C 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 78253/35(M)VC 10 0 100 300 200 Output Current (mA) 400 78253/55(M)VC 10 8 8 Output Voltage (V) Output Voltage (V) 78253/55(M)C 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 78253/35(M)C 100 80 Efficiency (%) Efficiency (%) 80 60 40 0 20 80 40 60 Output Current (mA) 40 0 100 120 78253/35(M)VC 100 0 100 200 300 Output Current (mA) 400 78253/55(M)VC 100 80 80 Efficiency (%) Efficiency (%) 60 20 20 0 78253/55(M)C 100 60 40 60 40 20 20 0 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 KMP_78253C_D04 Page 3 of 5 78253 Series MAX253 Compatible Converter Transformers TYPICAL CHARACTERISTICS (VOLTAGE CURVES) continued VOLTAGE DEVIATION 78253/35(M)C 105 100 95 90 -50 -25 75 100 78253/35(M)VC 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 78253/55(M)VC 110 Voltage Deviation from Nominal 25°C Output (%) 110 Voltage Deviation from Nominal 25°C Output (%) 50 0 25 Temperature (°C) 78253/55(M)C 110 Voltage Deviation from Nominal 25°C Output (%) Voltage Deviation from Nominal 25°C Output (%) 110 105 100 95 90 -50 -25 25 50 0 Temperature (°C) SOLDERING INFORMATION1 REPEATED HIGH-VOLTAGE ISOLATION TESTING Pin finish Matte tin Peak wave solder temperature 300˚C for 10 seconds 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. Peak reflow temperature 220˚C2 This consideration equally applies to agency recognized 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. TUBE OUTLINE DIMENSIONS 0.43 (10.95) 0.16 (4.00) 0.023±0.005 (0.60±0.15) 0.51 (12.95) 0.22 (5.50) 0.15 (3.80) 0.62 (15.70) Tube length: 18.3±0.08 (465±2). 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=25°C 1 For further information, please visit www.murata-ps.com/rohs 2 For high temperature reflow parts see 78253J series. www.murata-ps.com/support KMP_78253C_D04 Page 4 of 5 78253 Series MAX253 Compatible Converter Transformers TAPE & REEL SPECIFICATIONS REEL OUTLINE DIMENSIONS 2.36 (60) Min. Ø15.039 (382) Max. 0.94-1.08 (23.9-27.4)* Ø 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. Goods enclosure section 0.96 (24.4) 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). Ø 0.80 (20.20) Min. * Includes flange distortion at outer edge. Measured at hub. TAPE OUTLINE DIMENSIONS 0.157 (4.00) 78253 35MC 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) Cover tape 0.283 (7.20) 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). Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 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. © 2011 Murata Power Solutions, Inc. www.murata-ps.com/support KMP_78253C_D04 Page 5 of 5