1N4745ATR

Overview

The Fairchild Semiconductor 1N4745ATR is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 16V with a tolerance of ±5%. The device is rated for a maximum steady-state power dissipation of 1W and operates within a temperature range of -65°C to +200°C. Packaged in the DO-41 axial leaded format, it exhibits a maximum dynamic impedance of 16Ω at a test current of 15.5mA. The component supports through-hole mounting and provides isolated case connection.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction
• Features hermetically sealed glass construction for environmental protection
• Supports high thermal stability with an extended operating temperature range up to 200°C

Applications

• General purpose voltage reference circuits
• Overvoltage protection stages
• Power supply regulation modules

Procurement Notes

Verify that the specific suffix 'ATR' corresponds to the intended tape-and-reel packaging configuration rather than bulk quantities. Confirm RoHS compliance status and lead finish specifications against the manufacturer's latest datasheet revision. Ensure the ordering part number matches the required package variant and manufacturing origin to avoid discrepancies in component sourcing.

Selection Notes

Select this component when a standard 16V regulation point is required in axial through-hole designs. Consider the 1W power rating and 16Ω dynamic impedance for load regulation requirements. Evaluate the DO-41 package dimensions for PCB layout constraints. Compare performance against other manufacturers offering equivalent JEDEC standards if supply chain diversification is necessary.

Part Context

This device belongs to the widely recognized 1N47xxA series of Zener diodes, established under JEDEC DO-41 standards. Originally developed by Fairchild Semiconductor, production rights have transitioned to onsemi following corporate acquisitions. The series remains a fundamental component for discrete voltage clamping and reference applications across industrial electronics.

Replacement Considerations

Equivalent parts include the onsemi 1N4745A and Vishay 1N4745A. Verify pinout compatibility and thermal derating curves before substitution. Cross-reference electrical parameters such as Zener impedance and leakage current to ensure circuit performance remains within acceptable limits.