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KMP_78250C_C08 Page 1 of 3

78250 Series

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

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 existing designs, however, Murata Power Solutions will continue to manufacture and fully support these parts. For recommended alternatives please refer to the 78250J Series datasheet. CHARACTERISTICS 78250C/78250MC 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/78250MVC 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 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 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 All specifications typical at TA=25°C TECHNICAL NOTES ISOLATION VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Volt- age’, ‘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 opera- tion?” 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 volt- age 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 cor- rectly 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-acces- sible 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 materials, construction and environ- ment. 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 de- pend 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 there- fore 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 recog- nised parts rated for better than functional isolation where the wire enamel insulation is always supple- mented by a further insulation system of physical spacing or barriers.

KMP_78250C_C08 Page 2 of 3 MAX250/MAX251 Compatible Converter Transformers www.murata-ps.com/support 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_C08 Page 3 of 3 MAX250/MAX251 Compatible Converter Transformers www.murata-ps.com/support 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. 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/ 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).