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78250JC Datasheet(PDF) 1 Page - Murata Power Solutions Inc. |
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78250JC Datasheet(HTML) 1 Page - Murata Power Solutions Inc. |
1 / 3 page 78250J Series MAX250/MAX251 Compatible Converter SM Transformers KMP_78250JC_A03 Page 1 of 3 www.murata-ps.com For full details go to www.murata-ps.com/rohs www.murata-ps.com/support FEATURES n J-STD-020D reflow n RoHS compliant n Maxim MAX250/MAX251 compatible n Isolation to 4kVrms n Industry-standard pinout n Surface mount option n UL 94 V-0 package materials n Low profile n Toroidal construction n 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. For through hole versions see 78250 datasheet. CHARACTERISTICS 78250JC Parameter Conditions Min. Typ. Max. Units Primary Inductance, L P 10kHz, 100mV 1.0 2.0 2.5 mH Leakage Inductance, L L 100kHz, 100mV 0.6 3.0 μH Interwinding Capacitance, C WW 100kHz, 100mV 48 90 pF Primary D.C. Resistance, R DC <0.1VDC 0.7 2.0 Ω Volt-time Product, Et Pins1/2 or 2/3 50 Vμs Turns Ratio 1:1 CHARACTERISTICS 78250JVC Parameter Conditions Min. Typ. Max. Units Primary Inductance, L P 10kHz, 100mV 1.0 2.0 2.5 mH Leakage Inductance, L L 100kHz, 100mV 35 40 μH Interwinding Capacitance, C WW 100kHz, 100mV 4 10 pF Primary D.C. Resistance, R DC <0.1VDC 0.9 1.8 Ω Volt-time Product, Et Pins1/2 or 2/3 50 Vμs Turns Ratio 1:1 ORDER CODE DETAILS Order Code Package Type Packaging Type Quantity 78250JC / 78250JVC 6 Pin SM Tube 50 78250JC-R / 78250JVC-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, I PK 300mA Isolation voltage 78250(J)C (flash tested for 1 second) 1.5kVrms Isolation voltage 78250V(J)C (flash tested for 1 second) 4.0kVrms All specifications typical at T A=25°C 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 electri- cal 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 volt- age 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 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-accessi- ble 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 depend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high ap- plied 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. This consideration equally applies to agency recog- nized 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. |
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