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1N4779
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Product Detailed Parameters
- Description：DIODE ZENER 8.5V 500MW DO204AH
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Voltage - Zener (Nom) (Vz)：8.5 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：200 Ohms
- Current - Reverse Leakage @ Vr：-
- Operating Temperature：0°C ~ 75°C
- Mounting Type：Through Hole
- Package / Case：DO-204AH, DO-35, Axial
- Voltage - Forward (Vf) (Max) @ If：-
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Overview
The Microchip Technology 1N4779 is a temperature-compensated Zener reference diode with an 8.5V nominal voltage and 5% tolerance. It operates in the DO-204AA (DO-35) axial leaded package, dissipating up to 500mW of power. The device utilizes silicon construction with a glass encapsulation for hermetic sealing. Key electrical characteristics include a maximum reverse leakage current of 10µA. This component is designed for applications requiring stable voltage references across varying thermal conditions.
Feature Summary
- Temperature compensated design for stable voltage reference performance
- Hermetically sealed glass encapsulation for environmental protection
- Single configuration silicon Zener diode structure
Applications
- Precision voltage reference circuits
- Temperature compensated regulation systems
- Analog signal conditioning interfaces
Procurement Notes
Verify the specific suffix (e.g., /TR for tape and reel) against project requirements. Confirm RoHS compliance status as historical data indicates non-compliance for some variants. Ensure the manufacturer source is Microchip Technology or authorized predecessor entities like Microsemi. Validate package dimensions match DO-204AA specifications before integration.
Selection Notes
Select this component when a stable 8.5V reference is required with minimal drift over temperature ranges. Compare leakage current specifications against circuit sensitivity thresholds. Ensure the 500mW power dissipation rating accommodates the expected operating current without exceeding thermal limits. Verify package compatibility with existing PCB footprints.
Part Context
This part belongs to the standard Zener diode family, specifically optimized for temperature compensation. It serves as a foundational component in analog electronics where voltage stability is critical. The DO-35 package provides a compact solution for through-hole mounting. Historical lineage includes production by Microsemi prior to acquisition by Microchip Technology.
Replacement Considerations
Direct substitutes include other 8.5V temperature-compensated Zener diodes in the DO-35 package from compatible manufacturers. Verify pinout compatibility and thermal characteristics. Cross-reference datasheets for leakage current and impedance values to ensure functional equivalence in precision applications.
