1N4757P/TR12

Overview

The Microchip Technology 1N4757P/TR12 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) axial-lead package. It provides voltage regulation at a nominal Zener voltage of 51 V with a standard tolerance of ±10%. The device operates within a temperature range of -65°C to +150°C and features a maximum dynamic impedance of 95 Ω at a test current of 5.0 mA. It includes a maximum reverse current of 5 µA at a test voltage of 38.8 V and is supplied in tape and reel packaging.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for through-hole applications
• Constructed with a 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
• Reference voltage sources
• Overvoltage protection

Procurement Notes

Verify that the ordering suffix matches the required specifications, as different suffixes indicate variations in package type, screening level, or compliance status. Confirm the manufacturer origin, noting historical production by Microsemi Scottsdale Division and current availability under Microchip Technology. Ensure the specific variant aligns with the intended thermal and electrical requirements before procurement.

Selection Notes

Select this component for applications requiring a 51 V reference with ±10% tolerance in an axial-lead package. Consider the 1 W power dissipation limit and the need for derating based on ambient temperature. Evaluate the thermal resistance characteristics if mounting on FR4 PCBs versus direct lead attachment. Verify that the plastic construction meets environmental constraints compared to glass-body alternatives.

Part Context

This part belongs to the JEDEC registered 1N4728A through 1N4764A series of 1.0 watt Zener diodes. The 'P' suffix designates plastic encapsulation, which offers lower thermal resistance compared to glass-body options. The 'TR12' suffix indicates the device is supplied in tape and reel format according to EIA-296 standards, facilitating automated assembly processes.

Replacement Considerations

Surface mount equivalents are available as SMAJ4757A and MLL4757A. Other manufacturers may offer compatible parts within the same voltage and power class, but verification of pinout, tolerance, and thermal characteristics is required.