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1N4778A
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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：-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 Microchip Technology 1N4778A is a temperature-compensated Zener reference diode with an 8.5 V nominal voltage and ±5% tolerance. It operates in the DO-204AH (DO-35) axial through-hole package, featuring a 500 mW power dissipation rating at 25°C ambient temperature. The device utilizes a specific Zener/avalanche transition to minimize temperature coefficient variations, ensuring stable reference performance across industrial temperature ranges from -55°C to +100°C.
Feature Summary
- Temperature-compensated design for stable voltage reference
- Axial leaded construction for through-hole mounting
- High precision voltage tolerance
Applications
- Precision voltage reference circuits
- Temperature compensated regulator designs
- Calibration equipment references
Procurement Notes
Verify the manufacturer designation as Microchip Technology or its predecessor entities such as Microsemi when sourcing. Confirm the package type matches DO-204AH specifications. Ensure the part number suffix indicates standard tape-and-reel or bulk packaging if required by assembly processes. Cross-reference datasheets for specific test current conditions.
Selection Notes
Select this component when a stable 8.5 V reference is required with low temperature drift. The DO-35 package suits applications needing compact axial leads. Verify power derating curves for high-temperature environments. Consider the ±5% initial accuracy against tighter tolerance alternatives if higher precision is needed.
Part Context
This part belongs to the 1N47xx series of temperature-compensated Zener diodes. These devices are engineered to provide a flat voltage-temperature characteristic curve near the knee voltage region. The series is widely used in analog circuits requiring reliable reference voltages without complex compensation networks.
Replacement Considerations
Equivalent parts include the 1N4778A from other manufacturers like STMicroelectronics. Verify pinout compatibility and thermal characteristics before substitution. Ensure the replacement meets the same 8.5 V nominal voltage and power dissipation ratings.
