1N4757AP/TR12

Overview

The Microchip Technology 1N4757AP/TR12 is a silicon Zener diode with a nominal voltage of 51V and a 5% tolerance. It operates in the DO-41 (DO-204AL) plastic axial-lead package, rated for 1.0W power dissipation at 25°C. The device features a maximum dynamic impedance of 95Ω at a test current of 5mA and supports an operating temperature range from -65°C to +150°C. The TR12 suffix indicates tape and reel packaging compliant with EIA-296 standards.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals suitable for through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Moisture classification is Level 1 per IPC/JEDEC J-STD-020B requiring no dry pack

Applications

• Voltage regulation circuits
• Surge protection devices
• Reference voltage sources

Procurement Notes

Verify that the ordering suffix matches the required packaging configuration, as the TR12 designation specifically denotes tape and reel supply. Confirm compliance requirements such as RoHS status by checking for the e3 suffix if lead-free termination is necessary. Ensure the prefix aligns with standard commercial or military screening levels before finalizing procurement orders.

Selection Notes

Select this component when a 51V breakdown voltage with 5% tolerance is required in a high-power 1W axial package. Consider the lower thermal resistance of the plastic P-suffix construction compared to glass-body options. Evaluate the 95Ω dynamic impedance against circuit sensitivity requirements and verify that the 150°C maximum junction temperature meets the application's thermal environment.

Part Context

This part belongs to the 1N4728A through 1N4764A series of JEDEC-registered silicon Zener diodes manufactured by Microsemi. The series covers a voltage selection from 3.3V to 100V. The specific model utilizes the DO-41 plastic encapsulation, which offers distinct mechanical advantages over glass variants while maintaining electrical equivalence to the standard JEDEC registration.

Replacement Considerations

Surface mount equivalents are available as SMAJ4757A and MLL4757A. Verify pinout compatibility and thermal derating characteristics when transitioning between package types.