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1N4899A/TR
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Product Detailed Parameters
- Description：DIODE ZENER 12.8V 400MW DO7
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：12.8 V
- Tolerance：±5%
- Power - Max：400 mW
- Impedance (Max) (Zzt)：400 Ohms
- Current - Reverse Leakage @ Vr：-
- Operating Temperature：-55°C ~ 100°C
- Mounting Type：Through Hole
- Package / Case：DO-204AA, DO-7, Axial
- Voltage - Forward (Vf) (Max) @ If：-
- Grade：-
- Qualification：-
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Overview
The 1N4899A/TR is a temperature-compensated Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 12.8 V with a tolerance of ±5%. The device has a maximum power dissipation of 400 mW and a maximum Zener impedance of 400 Ohms. It operates within a temperature range of -55°C to 100°C. The component utilizes a DO-7 axial through-hole package and is supplied in a reel packaging format.
Feature Summary
- Temperature compensated design for stable voltage regulation across varying thermal conditions
- Through-hole axial leaded construction for standard PCB mounting
Applications
- Voltage reference circuits requiring thermal stability
- Precision voltage regulation applications
- Overvoltage protection in sensitive electronic systems
Procurement Notes
Verify the specific suffix TR indicates reel packaging when sourcing. Confirm the manufacturer is Microchip Technology, as this part number follows legacy JEDEC standards that may be produced by multiple vendors. Ensure the DO-7 package dimensions match your board layout requirements before finalizing procurement.
Selection Notes
Select this component when a precise 12.8 V reference with low temperature drift is required. The 400 mW power rating suits low-current applications. Verify that the ±5% tolerance meets circuit accuracy needs. Consider the through-hole package constraints against available surface-mount alternatives if space is limited.
Part Context
This part belongs to the 1N48xx series of Zener diodes, which are widely used for voltage regulation. The 'A' suffix typically denotes tighter tolerance or specific characteristics compared to non-suffixed versions. The '/TR' suffix specifically identifies the tape and reel packaging variant intended for automated assembly processes.
Replacement Considerations
Check datasheets for equivalent parts from other manufacturers producing the 1N4899A specification. Verify pinout compatibility and ensure replacement components meet the same 12.8 V nominal voltage and 400 mW power dissipation ratings.
