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1N4909A/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)：50 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 Microchip Technology 1N4909A/TR is a temperature compensated Zener diode designed for precision voltage reference applications. It features a nominal Zener voltage of 12.8 V with a tight tolerance of ±5%. The device operates in the DO-7 (DO-204AA) axial through-hole package and dissipates up to 400 mW. Key electrical characteristics include a maximum reverse leakage current of 15 µA, a Zener impedance of 50 Ohms, and a low voltage temperature coefficient of 0.005 %/°C. It is tested at 4 mA and functions within an operating temperature range of -55°C to +175°C.
Feature Summary
- Temperature compensated design ensures stable voltage regulation across varying thermal conditions
- Low noise operation suitable for sensitive analog circuitry
- High reliability construction with extended high-temperature capability
Applications
- Precision voltage reference circuits
- Temperature compensated oscillator circuits
- Low noise power supply regulation
Procurement Notes
Verify the specific suffix TR indicates tape and reel packaging configuration. Confirm RoHS compliance status as documentation may vary by production batch. Ensure the DO-7 package dimensions match the target PCB footprint requirements before finalizing procurement decisions.
Selection Notes
Select this component when precise voltage stability over temperature is required. The low temperature coefficient distinguishes it from standard Zener diodes. Verify that the 4 mA test current aligns with the biasing conditions of the target application circuit design.
Part Context
This part belongs to the 1N49xx series of temperature compensated Zener diodes manufactured by Microchip Technology. These components are engineered to provide superior thermal stability compared to conventional Zener devices, making them essential for high-precision electronic systems requiring consistent voltage references.
Replacement Considerations
Cross-reference with other manufacturers offering 1N4909 equivalents. Verify that substitute parts maintain the same 12.8 V nominal voltage, ±5% tolerance, and DO-7 package form factor to ensure mechanical and electrical compatibility.
