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Product Detailed Parameters
- Description：DIODE ZENER 25V 50W TO204AD
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：25 V
- Tolerance：±5%
- Power - Max：50 W
- Impedance (Max) (Zzt)：2.7 Ohms
- Current - Reverse Leakage @ Vr：10 µA @ 19 V
- Operating Temperature：-65°C ~ 175°C
- Mounting Type：Through Hole
- Package / Case：TO-204AD
- Voltage - Forward (Vf) (Max) @ If：1.5 V @ 10 A
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N2821B is a high-power Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 25 V with a tolerance of ±10%. The device supports a maximum power dissipation of 50 W and operates within an extended temperature range from -65°C to +175°C. Key electrical characteristics include a maximum Zener impedance of 2.7 Ohms, a reverse leakage current of 10 µA at 19 V, and a forward voltage of 1.5 V at 10 A. It utilizes the TO-204AD (TO-3) through-hole package.
Feature Summary
- High power handling capability up to 50 W for robust voltage regulation
- Extended operating temperature range suitable for harsh environments
- Low Zener impedance for stable voltage reference performance
Applications
- Industrial power supply voltage regulation
- High-power protection circuits
- Voltage reference standards in test equipment
Procurement Notes
Verify component authenticity through authorized Microchip distributors or direct channels. Confirm RoHS compliance status as indicated in official documentation, noting potential non-compliance for specific variants. Validate package integrity upon receipt to ensure proper thermal interface and mechanical stability during installation.
Selection Notes
Select this component when high power dissipation and wide temperature operation are required. Ensure circuit design accommodates the 50 W thermal load using appropriate heat sinking. Verify that the 25 V Zener voltage aligns with system requirements and that the TO-3 package fits the available PCB or chassis space.
Part Context
The 1N2821B belongs to the standard 1N28xx series of high-power Zener diodes manufactured by Microchip Technology. This series is widely recognized for its reliability in industrial and military-grade applications requiring precise voltage regulation under high stress conditions. The TO-3 package provides superior thermal conductivity compared to smaller surface-mount alternatives.
Replacement Considerations
The 1N2821A is documented as a parameter-equivalent substitute. Verify pinout compatibility and thermal resistance specifications before substitution. Ensure the alternative part meets the same 50 W power rating and 25 V Zener voltage requirements.
