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1N4779A/TR
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Product Detailed Parameters
- Description：DIODE ZENER 8.5V 500MW DO204AH
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：8.5 V
- Tolerance：±5%
- Power - Max：500 mW
- Impedance (Max) (Zzt)：200 Ohms
- Current - Reverse Leakage @ Vr：-
- Operating Temperature：-55°C ~ 100°C
- Mounting Type：Through Hole
- Package / Case：DO-204AH, DO-35, Axial
- Voltage - Forward (Vf) (Max) @ If：-
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Overview
The 1N4779A/TR is a temperature-compensated Zener diode manufactured by Microchip Technology. It features an 8.5 V nominal Zener voltage with a 5% tolerance and a maximum reverse leakage current of 10 uA. The device operates in the DO-204AH (DO-35) axial through-hole package, providing a power dissipation rating of 500 mW. It exhibits a Zener impedance of 200 Ohms at a test current of 1 mA. The component supports an operating temperature range from -65°C to +175°C and includes a voltage temperature coefficient of 0.0005 %/°C for stability.
Feature Summary
- Temperature compensation design ensures stable voltage regulation across wide thermal ranges
- High-temperature operation capability up to 175°C for demanding environments
- Axial leaded construction facilitates reliable through-hole mounting
Applications
- Precision voltage reference circuits requiring thermal stability
- Voltage regulation in high-temperature industrial systems
- Overvoltage protection in sensitive electronic instrumentation
Procurement Notes
Verify that the specific order matches the 1N4779A/TR designation to ensure the correct temperature-compensated variant is received. Confirm package compatibility with DO-204AH footprints during integration. Check RoHS compliance status as required by project specifications, noting potential variations between legacy and current production runs.
Selection Notes
Select this component when precise voltage regulation is critical under varying thermal conditions. The low temperature coefficient distinguishes it from standard Zener diodes. Ensure the circuit design accommodates the 500 mW power dissipation limit and the specific axial form factor for proper mechanical installation.
Part Context
This part belongs to the 1N47xx series of Zener diodes produced by Microchip Technology. It represents a specialized subset focused on temperature compensation rather than basic voltage clamping. The TR suffix indicates reel packaging for automated assembly processes.
Replacement Considerations
Direct substitutes include other temperature-compensated Zener diodes with identical 8.5 V ratings and similar thermal coefficients. Verify pinout compatibility and power dissipation limits before swapping.
