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1N4908/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：-25°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 1N4908/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 has a maximum power dissipation of 400 mW and operates within a junction temperature range of -65°C to 175°C. It utilizes the DO-7 (DO-204AA) axial through-hole package and is supplied in tape and reel packaging.
Feature Summary
- Temperature compensated design for stable voltage reference performance across varying thermal conditions
- Precision Zener voltage specification with tight manufacturing tolerance
- High reliability construction suitable for demanding industrial environments
Applications
- Precision voltage reference circuits
- Temperature compensated regulator designs
- Industrial control systems requiring stable voltage references
Procurement Notes
Verify the specific datasheet version from Microchip Technology to confirm exact electrical characteristics and mechanical dimensions. Ensure the TR suffix indicates tape and reel packaging compatibility with automated assembly equipment. Cross-reference part numbers carefully as similar identifiers may exist across different manufacturers or series.
Selection Notes
Select this component when a stable, temperature-compensated voltage reference is required rather than a standard Zener diode. The 12.8 V nominal voltage is specifically chosen for its low temperature coefficient properties. Consider the 400 mW power rating and DO-7 package constraints during PCB layout and thermal management planning.
Part Context
The 1N4908 series belongs to Microchip's lineup of temperature-compensated Zener reference diodes. These devices are engineered to provide superior stability compared to conventional Zener diodes by utilizing compensation techniques that minimize voltage drift over temperature changes. They are distinct from general-purpose rectifier or standard regulation diodes.
Replacement Considerations
Direct replacements must be temperature-compensated Zener diodes with a 12.8 V nominal voltage and compatible power ratings. Verify pinout compatibility and package dimensions before substitution. Standard Zener diodes without temperature compensation will not provide equivalent performance in reference applications.
