1N4757P/TR8

Overview

The Microchip Technology 1N4757P/TR8 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series, manufactured by Microsemi. It features a plastic DO-41 (DO-204AL) package with a P suffix indicating lower thermal resistance compared to glass-body options. The device provides voltage regulation at a nominal Zener voltage of 51 volts with a standard 5% tolerance. Key electrical parameters include a test current of 5.0 mA, maximum dynamic impedance of 95 ohms at IZT, and a maximum reverse current of 5 µA at 5 V. It supports a steady-state power dissipation of 1.0 watt and operates within a temperature range of -65°C to +150°C.

Feature Summary

• Provides voltage regulation over a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard PCB integration
• Constructed with void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation circuits requiring 51 V reference
• Power supply protection against overvoltage conditions
• General-purpose clipping and clamping applications

Procurement Notes

Verify that the ordering suffix matches the required configuration. The 'TR' suffix indicates tape and reel packaging per EIA-296 standards, while 'e3' denotes RoHS compliance. Confirm the 'P' suffix corresponds to the plastic encapsulated variant with specified thermal characteristics. Ensure compatibility with the intended manufacturing process regarding lead plating options.

Selection Notes

Select this component when a 51 V Zener voltage with 5% tolerance is required in a 1-watt plastic axial package. The plastic construction offers lower thermal resistance than glass equivalents. Consider the TR suffix if automated surface mount or through-hole assembly via tape and reel is necessary. Verify thermal derating requirements based on ambient temperature and mounting method.

Part Context

This part belongs to the 1N4728AP thru 1N4764AP series of silicon 1-watt Zener diodes produced by Microsemi's Scottsdale Division. The series covers a voltage selection from 3.3 to 100 volts. The 1N4757P specifically targets the 51-volt segment of this range. The product line includes various screening levels and package options to meet diverse industrial and military specifications.

Replacement Considerations

Surface mount equivalents are available as SMAJ4757A and MLL4757A. Direct pin-to-pin replacements must match the 1-watt power rating, 51 V Zener voltage, and DO-41 package dimensions. Verify thermal resistance and surge current capabilities align with the original design constraints.