1N4923/TR

Overview

The 1N4923/TR is a temperature-compensated Zener reference diode manufactured by Microchip Technology. It features a nominal Zener voltage of 19.2V with a tolerance of ±5%. The device has a maximum power dissipation of 500mW and operates within a specified temperature range. Key electrical parameters include a maximum reverse leakage current of 15µA and a voltage temperature coefficient of 0.005%/°C. It is housed in a DO-204AH (DO-35) through-hole package, suitable for precision voltage regulation applications requiring low noise and stable performance over temperature variations.

Feature Summary

• Temperature compensated design ensures stable voltage reference across operating temperatures
• Low noise characteristics suitable for precision analog circuits
• Through-hole DO-35 packaging for reliable board mounting

Applications

• Precision voltage reference sources
• Temperature compensated regulator circuits
• Low noise analog signal conditioning

Procurement Notes

Verify the component origin as Microchip Technology or its acquired entities such as Actel or Microsemi, as historical branding may vary on legacy stock. Confirm RoHS compliance status, as some listings indicate non-compliance while others suggest lead-free variants. Ensure the suffix /TR denotes the specific tape and reel packaging configuration if required for automated assembly processes. Cross-reference datasheet revisions to confirm parameter consistency.

Selection Notes

Select this component when a stable 19.2V reference with minimal temperature drift is required. The 500mW power rating supports moderate current loads in series configurations. Consider the DO-35 package constraints for PCB layout space. Verify that the ±5% initial tolerance meets circuit accuracy requirements without additional trimming. Evaluate the low leakage current specification for high-impedance input stages.

Part Context

This part belongs to the single Zener diode category within discrete semiconductor products. It is classified as a temperature-compensated Zener reference, distinct from standard Zener diodes due to its optimized voltage stability over temperature. The product lifecycle is listed as active, indicating ongoing manufacturing support. It falls under the broader family of voltage reference components used in measurement and control systems.

Replacement Considerations

Direct substitutes must match the 19.2V nominal voltage, ±5% tolerance, and 500mW power dissipation. Check for equivalent temperature coefficients near 0.005%/°C to maintain thermal stability. Ensure the replacement uses the same DO-35/DO-204AH axial leaded package for mechanical compatibility. Verify manufacturer equivalence between Microchip, Microsemi, and Actel designations.