78250_V01 MURATA-PS | Alldatasheet

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KMP_78250C_D03 Page 1 of 5

78250 Series

MAX250/MAX251 Compatible Converter Transformers www.murata-ps.com Ḥ For full details go to www.murata-ps.com/rohs www.murata.com

FEATURES

„RoHS compliant „Maxim MAX250/MAX251 compatible „Isolation to 4kVrms „Industry-standard pinout „Surface mount option „UL 94 V-0 package materials „Low profile „Toroidal construction „Fully encapsulated „Industrial temperature range

DESCRIPTION

The 78250 series of converter transformers are specifically designed for use with Maxim chipsets to provide isolated RS232 interfaces. Carefully controlled turns ratios ensure consistent performance whilst a toroidal construction minimises EMI. Surface-mount parts The surface-mount (M suffix) products are not recommended for new designs. For recommended alternatives please refer to the 78250J Series datasheet. CHARACTERISTICS 78250C Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP 10kHz, 100mV 1.0 2.0 2.5 mH Leakage Inductance, LL 100kHz, 100mV 2.0 3.0 μH Interwinding Capacitance, CWW 100kHz, 100mV 69 90 pF Volt-time Product, Et Pins1/2 or 2/3 50 Vμs CHARACTERISTICS 78250VC Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP 10kHz, 100mV 1.0 2.0 2.5 mH Leakage Inductance, LL 100kHz, 100mV 35 40 μH Interwinding Capacitance, CWW 100kHz, 100mV 9 12 pF Volt-time Product, Et Pins1/2 or 2/3 50 Vμs CHARACTERISTICS 78250MC Recommended AlternativeParameter Conditions Min. Typ. Max. Units Primary Inductance, LP 10kHz, 100mV 1.0 2.0 2.5 mH 78250JC Leakage Inductance, LL 100kHz, 100mV 2.0 3.0 μH Interwinding Capacitance, CWW 100kHz, 100mV 69 90 pF Volt-time Product, Et Pins1/2 or 2/3 50 Vμs CHARACTERISTICS 78250MVC Recommended AlternativeParameter Conditions Min. Typ. Max. Units Primary Inductance, LP 10kHz, 100mV 1.0 2.0 2.5 mH 78250JVC Leakage Inductance, LL 100kHz, 100mV 35 40 μH Interwinding Capacitance, CWW 100kHz, 100mV 9 12 pF Volt-time Product, Et Pins1/2 or 2/3 50 Vμs ORDER CODE DETAILS Order Code Package Type Packaging Type Quantity 78250C / 78250VC 6 Pin DIL Tube 50 78250MC / 78250MVC 6 Pin SM Tube 50 78250MC-R / 78250MVC-R 6 Pin SM Tape & Reel 500 All specifications typical at TA=25°C 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 300mA Isolation voltage 78250(M)C (flash tested for 1 second) 1.5kVrms Isolation voltage 78250(M)VC (flash tested for 1 second) 4.0kVrms

KMP_78250C_D03 Page 2 of 5 MAX250/MAX251 Compatible Converter Transformers www.murata.com 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. REPEATED HIGH-VOLTAGE ISOLATION TESTING 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 materi- als, construction and environment. This series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enamelled wire. While parts can be expected to withstand several times the stated test voltage, the iso- lation 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 lim- ited. 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. This consideration equally applies to agency recognised 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.

KMP_78250C_D03 Page 3 of 5 MAX250/MAX251 Compatible Converter Transformers www.murata.com PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS RECOMMENDED FOOTPRINT DETAILS 0.354 (9.0) Max. 0.375 (9.52) Max. 0.5 (12.70) 0.025 (0.63) 0.021 (0.53) 0.035 (0.90) 0.012±0.30 (0.008±0.20) 0.25 (6.35) 0.1 (2.54) 78250MC XYYWW 0.135±0.02 (3.44±0.50) 0.25 (6.35) 0.354 (9.0) Max. 0.375 (9.52) MAX Primary PrimarySecondary Secondary 0.012(0.30) 0.008(0.20) 0.40 (10.16) 0.025 (0.63) 0.021 (0.53)0.1 (2.54) 78250C XYYWW

6 Pin DIL 6 Pin SM

Pin finish Matte tin Peak wave solder temperature 300˚C for 10 seconds Peak reflow temperature 220˚C2 1 For further information, please visit www.murata-ps.com/rohs 2 For high temperature reflow parts see 78250J Series. 0.10 (2.54) 0.10 (2.54) -0.000 (0.00) Unless otherwise stated all dimensions in inches (mm) ±0.01 (0.25) of true position. Unless otherwise stated all dimensions in inches (mm) ±0.01 (0.25). * Pin 5 is connected to secondary center tap. Package Weight 1.0g TYP . 0.45 (11.50) 0.10 (2.54) 0.04 (1.00) 0.06 (1.60) TUBE OUTLINE DIMENSIONS 0.023±0.005 (0.60±0.15) 0.16 (4.00) 0.22 (5.50) 0.43 (10.95) 0.51 (12.95) 0.15 (3.80) 0.62 (15.70) Unless otherwise stated all dimensions in inches (mm) ±0.01 (0.25). Tube length: 18.3±0.08 (465±2). Tube material: Antistatic coated clear pvc.

KMP_78250C_D03 Page 4 of 5 MAX250/MAX251 Compatible Converter Transformers www.murata.com TAPE & REEL SPECIFICATIONS REEL OUTLINE DIMENSIONS TAPE OUTLINE DIMENSIONS 1.20 (30.4) Max. 0.53 (13.50) 0.50 (12.80) 0.059 (1.50) Min. 2.36 (60) Min. 0.80 (20.20) Min. 3.9 (100) Min. Leader section 15.7 (400) Min. Goods enclosure section Trailer section 6.3 (160) Min. Ø15.039 (382) Max. Ø Ø 0.96 (24.4) 1.04 (26.4) g g Unless otherwise stated all dimensions in inches (mm) ±0.01(0.25). * Includes flange distortion at outer edge. g Measured at hub. 0.024 (0.60) Max. 0.283 (7.20) 0.369 (9.37) Direction of unreeling 0.069 (1.75) 0.453 (11.50) 0.472 (12.00)Cover tape -0.000 +0.10 -0.00 0.945 (24.00 ) +0.012-0.004 +0.30-0.10 78250CXYYWW Unless otherwise stated all dimensions in inches (mm) ±0.01(0.25).

KMP_78250C_D03 Page 5 of 5 MAX250/MAX251 Compatible Converter Transformers www.murata.com Murata Power Solutions (Milton Keynes) Ltd. 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. © 2021 Murata Power Solutions (Milton Keynes) Ltd This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: https://www.murata.com/en-eu/products/power/requirements DISCLAIMER Unless otherwise stated in the datasheet, all products are designed for standard commercial and industrial applications and NOT for safety-critical and/or life-critical applications. Particularly for safety-critical and/or life-critical applications, i.e. applications that may directly endanger or cause the loss of life, inflict bodily harm and/or loss or severe damage to equipment/property, and severely harm the environment, a prior explicit written approval from Murata is strictly required. Any use of Murata standard prod- ucts for any safety-critical, life-critical or any related applications without any prior explicit written approval from Murata shall be deemed unauthorised use. These applications include but are not limited to:

  • Aircraft equipment
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  • Traffic signal equipment
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  • Data Processing equipment Murata makes no express or implied warranty, representation, or guarantee of suitability, fitness for any particular use/purpose and/or compatibility with any applica- tion or device of the buyer, nor does Murata assume any liability whatsoever arising out of unauthorised use of any Murata product for the application of the buyer. The suitability, fitness for any particular use/purpose and/or compatibility of Murata product with any application or device of the buyer remain to be the responsibility and liability of the buyer. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards that anticipate dangerous consequences of failures, moni- tor failures and their consequences, lessen the likelihood of failures that might cause harm, and take appropriate remedial actions. Buyer will fully indemnify and hold Murata, its affiliated companies, and its representatives harmless against any damages arising out of unauthorised use of any Murata products in any safety-critical and/ or life-critical applications. Remark: Murata in this section refers to Murata Manufacturing Company and its affiliated companies worldwide including, but not limited to, Murata Power Solutions.