1N2993B

Overview

The Microchip Technology 1N2993B is a 10-watt Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 47V with a tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and utilizes a DO-203AA (DO-4) flange mount package. Key electrical characteristics include a maximum reverse leakage current of 1µA at 38.4V, a Zener impedance of 1.5 Ohms, and a forward voltage of 1.5V at 2A.

Feature Summary

• High power dissipation capability of 10 watts for robust voltage regulation
• Extended operating temperature range suitable for demanding environments
• Low Zener impedance for stable voltage performance under varying loads
• Flange mount construction for efficient thermal management

Applications

• Industrial power supply voltage regulation
• Military and aerospace electronic systems
• High-power protection circuits
• Reference voltage sources in harsh environments

Procurement Notes

Verify the specific suffix codes against official Microchip documentation to ensure correct voltage tolerance and qualification levels. Confirm that the DO-203AA flange mount specifications match your thermal design requirements. Check for any recent product change notifications or end-of-life notices directly from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when high power handling and wide temperature stability are required. Ensure the mounting surface area supports the 10W dissipation without exceeding junction temperature limits. Compare Zener impedance and leakage current specifications against circuit sensitivity requirements to confirm suitability for precise regulation tasks.

Part Context

The 1N2993B belongs to the 1N2970B through 1N3015B series of 10-watt Zener diodes manufactured by Microchip Technology. This series is qualified per MIL-PRF-19500/124 for JAN, JANTX, and JANTXV levels, indicating its use in high-reliability applications. The part is categorized under discrete semiconductor diodes and rectifiers.

Replacement Considerations

Consult official Microchip cross-reference tools for verified equivalents. Generic replacements may not meet the MIL-PRF-19500/124 qualification standards or the specific 10W power rating. Verify pinout compatibility and thermal resistance values before substituting.