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 FEATURES 78253/35MVC SM 78253/55VC DIL (cid:132) RoHS compliant 5.0 5.0 200 4000 1:1.33 78253/55MVC SM (cid:132)(cid:3)Maxim MAX253 compatible ORDER CODE DETAILS (cid:132)(cid:3)3.3V and 5V versions Order Code Package Type Packaging Type Quantity (cid:132)(cid:3)Isolation to 4kVDC 78253/XX(V)C 6 Pin DIL Tube 50 78253/XXM(V)C 6 Pin SM Tube 50 (cid:132)(cid:3)Frequency range to 500kHZ 78253/XXM(V)C-R 6 Pin SM Tape & Reel 500 (cid:132)(cid:3)Toroidal construction 78253/35(M)C CHARACTERISTICS (cid:132)(cid:3)Industry-standard pinout Parameter Conditions Min. Typ. Max. Units Primary Inductance, L 100kHz, 250mV 0.30 0.38 0.46 mH (cid:132)(cid:3)UL 94 V-0 package materials P Secondary Inductance, L 100kHz, 250mV 1.60 2.00 2.40 mH S (cid:132)(cid:3)Fully encapsulated Leakage Inductance, L 100kHz, 250mV 0.30 1.00 μH L (cid:132)(cid:3)Low profile Interwinding Capacitance, CWW 100kHz, 250mV 30 50 pF Primary D.C. Resistance, R >0.1VDC 0.40 1.00 Ω (cid:132)(cid:3)Surface mount option DC Volt-time Product, Et Pins 1/2 or 2/3 30 35 Vμs (cid:132)(cid:3)Industrial temperature range 78253/55(M)C CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units DESCRIPTION Primary Inductance, L 100kHz, 250mV 0.60 0.83 1.10 mH P Secondary Inductance, L 100kHz, 250mV 1.10 1.40 1.70 mH The 78253 series of converter transformers are S Leakage Inductance, L 100kHz, 250mV 0.35 1.00 μH specifically designed for use with the MAX253 L Interwinding Capacitance, C 100kHz, 250mV 30 50 pF chip set to provide isolated power supplies. The WW Primary D.C. Resistance, R >0.1VDC 0.70 1.50 Ω 5V version can supply 1W and the 3.3V version DC Volt-time Product, Et Pins 1/2 or 2/3 40 50 Vμs can supply 500mW. A centre tapped secondary winding allows for full bridge, half bridge or 78253/35(M)VC CHARACTERISTICS voltage doubling. Parameter Conditions Min. Typ. Max. Units Primary Inductance, L 100kHz, 20mV 110 142 185 μH P Secondary Inductance, L 100kHz, 20mV 550 710 850 μH Surface-mount parts S Leakage Inductance, L 100kHz, 250mV 3.00 5.00 μH L The surface-mount (M suffix) products are not Interwinding Capacitance, C 100kHz, 250mV 4.20 8.00 pF WW recommended for new designs. For existing designs, Primary D.C. Resistance, R >0.1VDC 0.30 0.50 Ω DC however, Murata Power Solutions will continue to Volt-time Product, Et Pins 1/2 or 2/3 18 22 Vμs 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 μH P Secondary Inductance, L 100kHz, 20mV 350 444 540 μH S Leakage Inductance, L 100kHz, 250mV 5.20 8.00 μH L Interwinding Capacitance, C 100kHz, 250mV 4.20 8.00 pF WW Primary D.C. Resistance, R >0.1VDC 0.40 0.60 Ω DC Volt-time Product, Et Pins 1/2 or 2/3 25 28 Vμs All specifications typical at T=25°C A For full details go to www.murata-ps.com/rohs www.murata-ps.com/support KMP_78253C_D06 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 I 400mA PK 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 0.5 (12.70) 0.375 0.375 (9.52) MAX Top View (9.52) MAX Top View Primary Secondary Primary Secondary 1 6 1 6 0.354 0.354 (9.0) MAX 2 5 (9.0) MAX 2 5 78253/35C 78253/55MC XYYWW 3 4 XYYWW 3 4 0.25 0.25 (6.35) (6.35) 0.135±0.02 0.012 0.30 (3.44±0.50) (0.008 0.20) 0.035 0.025 (0.63) (0.90) 0.1 0.021 (0.53) 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) 0.10 (2.54) Ø0.05 (1.20)+0.006 (0.15) -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 KMP_78253C_D06 Page 2 of 5

78253 Series MAX253 Compatible Converter Transformers TYPICAL CHARACTERISTICS (VOLTAGE CURVES) VOLTAGE CURVES 78253/35(M)C 78253/55(M)C 10 10 8 8 V) V) e ( 6 e (6 g g a a olt olt ut V 4 ut V4 p p ut ut O 2 O2 0 0 0 20 40 60 80 100 120 0 100 200 300 400 Output Current (mA) Output Current (mA) 78253/35(M)VC 78253/55(M)VC 10 10 8 8 V) V) e ( 6 e (6 g g a a olt olt ut V 4 ut V4 p p ut ut O 2 O2 0 0 0 20 40 60 80 100 0 100 200 300 400 Output Current (mA) Output Current (mA) EFFICIENCY CURVES 78253/35(M)C 78253/55(M)C 100 100 80 80 %) 60 %)60 cy ( cy ( en 40 en40 ci ci Effi Effi 20 20 0 0 0 20 40 60 80 100 120 0 100 200 300 400 Output Current (mA) Output Current (mA) 78253/35(M)VC 78253/55(M)VC 100 100 80 80 %) 60 %)60 cy ( cy ( en 40 en40 ci ci Effi Effi 20 20 0 0 0 20 40 60 80 100 0 100 200 300 400 Output Current (mA) Output Current (mA) 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_D06 Page 3 of 5

78253 Series MAX253 Compatible Converter Transformers TYPICAL CHARACTERISTICS (VOLTAGE CURVES) continued VOLTAGE DEVIATION 78253/35(M)C 78253/55(M)C 110 110 al al n n mi 105 mi 105 o o e Deviation from N 25°C Output (%) 10905 e Deviation from N 25°C Output (%)10905 g g a a olt olt V 90 V 90 -50 -25 0 25 50 75 100 -50 -25 0 25 50 75 100 Temperature (°C) Temperature (°C) 78253/35(M)VC 78253/55(M)VC 110 110 al al n n omi 105 omi 105 e Deviation from N 25°C Output (%) 10905 e Deviation from N 25°C Output (%)10905 g g a a olt olt V 90 V 90 -50 -25 0 25 50 75 100 -50 -25 0 25 50 75 100 Temperature (°C) Temperature (°C) TECHNICAL NOTES SOLDERING INFORMATION1 ISOLATION VOLTAGE REPEATED HIGH-VOLTAGE Pin finish Matte tin ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Volt- ISOLATION TESTING Peak wave solder temperature 300˚C for 10 seconds age’, ‘Proof Voltage’, ‘Dielectric Withstand It is well known that repeated high-voltage Peak reflow temperature 220˚C2 Voltage’ & ‘Isolation Test Voltage’ are all terms isolation testing of a barrier component can that relate to the same thing, a test voltage, actually degrade isolation capability, to a applied for a specified time, across a compo- lesser or greater degree depending on ma- TUBE OUTLINE DIMENSIONS nent designed to provide electrical isolation, to terials, construction and environment. This verify the integrity of that isolation. series has toroidal isolation transformers, 0.43 (10.95) All products in this series are 100% production with no additional insulation between pri- tested at their stated isolation voltage. mary and secondary windings of enameled 0.16 (4.00) wire. While parts can be expected to with- A question commonly asked is, “What is the stand several times the stated test voltage, continuous voltage that can be applied across the isolation capability does depend on the 0.023±0.005 0.51 the part in normal operation?” wire insulation. Any material, including this (0.60±0.15) (12.95) For a part holding no specific agency approv- enamel (typically polyurethane) is suscep- als both input and output should normally be tible to eventual chemical degradation when 0.22 (5.50) maintained within SELV limits i.e. less than subject to very high applied voltages thus 42.4V peak, or 60VDC. The isolation test implying that the number of tests should be (03..1850) voltage represents a measure of immunity to strictly limited. We therefore strongly advise transient voltages and the part should never against repeated high voltage isolation test- 0.62 (15.70) be used as an element of a safety isolation ing, but if it is absolutely required, that the Tube length: 18.3±0.08 (465±2). Tube quantity: 50. system. The part could be expected to function voltage be reduced by 20% from specified Tube material: Antistatic coated clear pvc. correctly with several hundred volts offset test voltage. Unless otherwise stated all dimensions in inches(mm) ±0.01 (0.25). applied continuously across the isolation bar- rier; but then the circuitry on both sides of the This consideration equally applies to agency All specifications typical at T=25°C barrier must be regarded as operating at an recognised parts rated for better than 1 For further information, plAease visit www.murata-ps.com/rohs unsafe voltage and further isolation/insulation functional isolation where the wire enamel 2 For high temperature reflow parts see 78253J series. systems must form a barrier between these insulation is always supplemented by a circuits and any user-accessible circuitry ac- further insulation system of physical spacing cording to safety standard requirements. or barriers. www.murata-ps.com/support KMP_78253C_D06 Page 4 of 5

78253 Series MAX253 Compatible Converter Transformers TAPE & REEL SPECIFICATIONS REEL OUTLINE DIMENSIONS Ø15.039 (382) Max. 2.36 (60) Min. 0.94-1.08 (23.9-27.4)* Ø0.53 (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. (cid:103) Goods enclosure section 0.96 (24.4)(cid:103) 1.04 (26.4) Trailer section Reel quantity: 500 6.3 (160) Min. Unless otherwise stated all dimensions in inches (mm) ±0.01(0.25). * Includes flange distortion at outer edge. Ø0.80 (20.20) Min. (cid:103) Measured at hub. TAPE OUTLINE DIMENSIONS 0.069 (1.75) 0.157 (4.00) 0.079 (2.00) 0.059 + - 00 .. 00 00 04 (1.50 + - 00 .. 01 00 ) 21.0+003.0+0.945 (24.00 )0400.-01.0- 0.453 (11.50) WWYYXCM5335287 Cover tape 0.369 (9.37) 0.472 (12.00) 0.024 (0.60) Max. 0.283 (7.20) 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. © 2018 Murata Power Solutions, Inc. www.murata-ps.com/support KMP_78253C_D06 Page 5 of 5

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M urata: 78253/55 78253/35MV 78253/35M 78253/35V 78253/55M 78253/35 78253/55MV 78253/55V 78253/55MVC 78253/35VC 78253/35MC 78253/35MVC 78253/55VC 78253/55MC 78253/35C 78253/55C 78253/35MC-R 78253/35MVC-R 78253/55MC-R 78253/55MVC-R