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Product Detailed Parameters
- Description：DIODE ZENER 20V 50W TO204AD
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：20 V
- Tolerance：±10%
- Power - Max：50 W
- Impedance (Max) (Zzt)：2.4 Ohms
- Current - Reverse Leakage @ Vr：10 µA @ 15.2 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 1N2818A is a high-power Zener diode designed for robust voltage regulation applications. It features a nominal Zener voltage of 20 V with a tolerance of ±10%. The device supports a maximum power dissipation of 50 W and operates within an extended junction temperature range of -65°C to 175°C. Packaged in the TO-204AD (TO-3) through-hole format, it exhibits a maximum Zener impedance of 2.4 Ohms and a reverse leakage current of 10 µA at 15.2 V.
Feature Summary
- High power handling capability of 50 W for demanding regulation tasks
- Extended thermal stability operating up to 175°C junction temperature
- Robust axial leaded construction in TO-204AD package
Applications
- High-power voltage reference circuits
- Industrial power supply regulation
- Over-voltage protection systems
Procurement Notes
Verify RoHS compliance status prior to procurement as this specific part number may not meet current environmental directives. Confirm that the TO-204AD package dimensions align with your PCB footprint requirements. Ensure thermal management solutions are adequate for 50 W dissipation. Validate that the 20 V nominal voltage matches system design specifications exactly.
Selection Notes
Select this component when high power dissipation and wide temperature operation are required. The TO-204AD package offers superior thermal performance compared to smaller surface-mount alternatives. Consider the ±10% voltage tolerance for circuit precision requirements. Evaluate the 2.4 Ohm impedance for dynamic load regulation needs.
Part Context
This device belongs to the 1N28xx series of high-power Zener diodes manufactured by Microchip Technology. These components are engineered for industrial environments requiring reliable voltage clamping and reference generation under extreme thermal conditions. The series utilizes metallurgical bonding techniques for enhanced durability and long-term stability in harsh operating scenarios.
Replacement Considerations
The 1N2818RB is documented as a parameter-equivalent substitute. Verify pinout compatibility and ensure the replacement meets the same 50 W power rating and 20 V specification before implementation.
