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1N4256SM
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Product Detailed Parameters
- Description：DIODE STD 2500V 250MA S SQMELF
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Technology：Standard
- Voltage - DC Reverse (Vr) (Max)：2500 V
- Current - Average Rectified (Io)：250mA
- Voltage - Forward (Vf) (Max) @ If：3.5 V @ 100 mA
- Speed：Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr)：-
- Current - Reverse Leakage @ Vr：1 µA @ 2500 V
- Capacitance @ Vr, F：-
- Mounting Type：Surface Mount
- Package / Case：SQ-MELF, S
- Supplier Device Package：S, SQ-MELF
- Operating Temperature - Junction：-65°C ~ 175°C
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Overview
The Microchip Technology 1N4256SM is a high voltage standard recovery rectifier diode designed for demanding environments. It features a working peak reverse voltage of 2000 V and an average rectified forward current rating of 0.25 A at 55 °C, reducing to 0.15 A at 100 °C. The device utilizes a voidless hermetically sealed glass package with tungsten slugs, ensuring robust construction. Electrical characteristics include a maximum forward voltage of 3.5 V at 100 mA and a minimum breakdown voltage of 2400 V. It operates within a junction temperature range of -65 °C to +175 °C.
Feature Summary
- Hermetically sealed voidless hard glass construction with tungsten slugs for thermal management.
- Triple-layer passivation providing low reverse leakage and absolute high voltage stability.
- Military qualification available per MIL-PRF-19500/279 standards.
- Inherently radiation hard design suitable for harsh environments.
Applications
- High voltage power supplies
- Radar equipment
- X-ray machines
- Voltage multipliers
Procurement Notes
Verify the specific ordering suffix against the manufacturer's documentation to confirm RoHS compliance status, as commercial versions may differ from military qualified parts. Ensure the procurement channel sources directly from authorized distributors or the manufacturer to guarantee authenticity. Confirm that the package type matches the required S package dimensions and lead specifications for your assembly process.
Selection Notes
Select this component when high voltage isolation and reliability are critical. The 2000 V rating suits applications requiring significant reverse voltage blocking. Consider the thermal resistance and operating temperature limits for heat dissipation requirements. Verify if military qualification levels like JAN or JANTX are necessary for the specific application environment.
Part Context
This part belongs to the 1N4254–1N4257 series of standard recovery high voltage rectifiers. These devices are JEDEC registered and share similar electrical profiles within the series, differentiated primarily by their working peak reverse voltage ratings. The series is engineered for high-reliability applications where failure is not an option.
Replacement Considerations
Consult the official datasheet for direct equivalents within the 1N3643–1N3647 or 1N5181–1N5184 series. Verify that any substitute matches the 2000 V reverse voltage and 0.25 A current ratings. Ensure the replacement maintains the hermetically sealed glass package construction if environmental sealing is required.
FAQ
What is the maximum surge current capability of the 1N4256SM?
The maximum rated surge current (IZSM) for the 1N4256SM is 10 Amps at an 8.3 ms pulse duration.
Is the 1N4256SM inherently radiation hard?
Yes, the device is described as inherently radiation hard in accordance with Microsemi MicroNote 050.
