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1N4623-1
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Product Detailed Parameters
- Description：DIODE ZENER 4.3V 500MW DO7
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：4.3 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：1600 Ohms
- Current - Reverse Leakage @ Vr：2 µA @ 2 V
- Operating Temperature：-65°C ~ 175°C
- Mounting Type：Through Hole
- Package / Case：DO-204AA, DO-7, Axial
- Voltage - Forward (Vf) (Max) @ If：1.1 V @ 200 mA
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N4623-1 is a 500 mW metallurgically bonded glass Zener diode in an axial-lead DO-35 package. It provides a nominal Zener voltage of 4.3 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and features a maximum dynamic impedance of 1600 Ohms at a test current of 250 µA.
Feature Summary
- Hermetically sealed construction using internal metallurgical bonding for high reliability.
- Qualified per MIL-PRF-19500/435 for JAN, JANTX, JANTXV, and JANS levels.
- Inherently radiation hard as described in Microsemi MicroNote 050.
Applications
- High-reliability military and aerospace circuits
- Voltage regulation over broad ranges of current and temperature
- Radiation-hardened electronic systems
Procurement Notes
Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these designations indicate different qualification standards under MIL-PRF-19500/435. Confirm that the component meets all environmental and testing requirements specified in the datasheet before integration into production designs.
Selection Notes
Select this component when a hermetically sealed, radiation-tolerant Zener regulator is needed. Ensure the circuit design accommodates the 500 mW power dissipation limit and the linear derating curve starting at 50°C lead temperature. Verify that the 4.3 V breakdown voltage aligns with the system's reference requirements.
Part Context
This part belongs to the 1N4614-1 through 1N4627-1 series of 500 mZener diodes. These devices are JEDEC registered and offer voltages from 1.8 to 100 V. They are available in axial-lead DO-35 packages and surface mount options like DO-213AA.
Replacement Considerations
Direct substitutes include other manufacturers' parts meeting MIL-PRF-19500/435 specifications for the 1N4623-1 designation. Ensure any replacement matches the 4.3 V nominal voltage, 500 mW power rating, and DO-35 package dimensions.
FAQ
What is the maximum noise density for the 1N4623-1?
The maximum noise density is 2.0 µV/√Hz at the test current of 250 µA.
How does the power dissipation change with temperature?
The 0.5 W rating must be linearly derated starting at a lead temperature of 50°C and goes to zero at 175°C.
