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1N4938-1
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Product Detailed Parameters
- Description：DIODE STD 175V 100MA DO204AH
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Technology：Standard
- Voltage - DC Reverse (Vr) (Max)：175 V
- Current - Average Rectified (Io)：100mA
- Voltage - Forward (Vf) (Max) @ If：1 V @ 100 mA
- Speed：Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr)：50 ns
- Current - Reverse Leakage @ Vr：100 nA @ 175 V
- Capacitance @ Vr, F：-
- Mounting Type：Through Hole
- Package / Case：DO-204AH, DO-35, Axial
- Supplier Device Package：DO-204AH (DO-35)
- Operating Temperature - Junction：-65°C ~ 175°C
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Overview
The Microchip Technology 1N4938-1 is a hermetically sealed switching diode designed for high-reliability applications. It features a DO-35 glass package with copper-clad steel leads and tin/lead finish. Key electrical parameters include a maximum DC reverse voltage of 175V, an operating current of 100mA at +25°C, and a total power dissipation of 500mW. The device exhibits a maximum reverse recovery time (trr) of 50ns and a junction-to-lead thermal resistance of 250°C/W. It operates within a temperature range of -65°C to +175°C.
Feature Summary
- Hermetically sealed metallurgically bonded construction
- Double plug design for enhanced reliability
- Available in JAN, JANTX, and JANTXV grades per MIL-PRF-19500/169
Applications
- High-reliability signal or computer diode circuits
- Military and aerospace electronic systems
- Harsh environment switching applications
Procurement Notes
Verify the specific grade requirement (JAN, JANTX, or JANTXV) as availability varies by manufacturer lot. Confirm lead material specifications, noting the standard copper-clad steel composition. Ensure compliance with MIL-PRF-19500/169 standards if required for your application. Check for RoHS status, as this component may not be compliant. Validate thermal derating requirements against your operational ambient temperature limits.
Selection Notes
Select this component when hermetic sealing and high-temperature operation are critical. The 175V reverse voltage rating suits moderate voltage switching tasks. Consider the 50ns reverse recovery time for general-purpose high-speed switching. Evaluate the 500mW power dissipation limit against circuit load currents. The DO-35 through-hole package dictates board layout constraints.
Part Context
This part belongs to the 1N4938 series of switching diodes manufactured under military specifications. It is distinct from commercial variants due to its hermetic seal and rigorous testing protocols defined by MIL-PRF-19500/169. The -1 suffix typically denotes specific manufacturing or testing criteria aligned with these defense standards.
Replacement Considerations
Direct replacements must match the MIL-PRF-19500/169 specification. Verify equivalent parts offer identical hermetic sealing and thermal characteristics. Cross-reference JAN, JANTX, and JANTXV grades for functional compatibility.
