1N5257B-FS

Single Zener Diodes Overview

The Fairchild Semiconductor 1N5257B-FS is a single silicon Zener diode housed in the DO-35 axial through-hole package. It provides a nominal Zener voltage of 33 V with a tolerance of ±5%. The device dissipates up to 500 mW and operates within a temperature range of -65 °C to +200 °C. Key electrical parameters include a maximum reverse leakage current of 100 nA, a Zener impedance of 58 Ω at a test current of 3.8 mA, and a forward voltage of 1.1 V at 200 mA.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation via avalanche breakdown characteristics
• Features low reverse leakage current for efficient standby operation
• Utilizes a glass-passivated DO-35 case for environmental protection
• Supports high junction temperatures up to 200 °C

Single Zener Diodes Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in power supply inputs
• Clamping applications to limit signal amplitude peaks
• Biasing networks for transistor amplifier stages

Single Zener Diodes Procurement Notes

Verify the specific suffix 'FS' against official Fairchild or onsemi datasheets to confirm if it denotes a distinct tape-and-reel variant or standard bulk packaging. Ensure the component matches the required RoHS compliance status for your assembly process. Cross-reference the manufacturer's part number with current onsemi documentation, as Fairchild Semiconductor operations have been integrated into onsemi.

Single Zener Diodes Selection Notes

Select this component when a 33 V reference point is required in a through-hole design. The 500 mW power rating suits moderate current applications without active cooling. Consider the 58 Ω impedance for noise sensitivity requirements. Verify that the 3.8 mA test current aligns with the bias conditions of your target circuit to ensure accurate voltage regulation.

Single Zener Diodes Part Context

This component belongs to the 1N52xx series of small-signal Zener diodes manufactured by Fairchild Semiconductor, now part of onsemi. These devices are widely used in general-purpose electronics for voltage regulation and protection. The DO-35 package is a standard axial leaded form factor suitable for manual soldering and automated through-hole placement.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N5257B from other manufacturers such as Taiwan Semiconductor or Microchip. Verify pinout compatibility and thermal resistance values before substitution. Ensure the replacement maintains the same 33 V nominal voltage and 5% tolerance to preserve circuit performance.