1N4737P/TR8

Overview

The Microchip Technology 1N4737P/TR8 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series. It provides voltage regulation with a nominal Zener voltage of 7.5 V and a standard tolerance of ±10%. The device operates within a temperature range of -65°C to +150°C and features a plastic DO-41 (DO-204AL) package. Electrical characteristics include a maximum dynamic impedance of 4.0 Ω at a test current of 34 mA, a maximum reverse current of 10 μA, and a steady-state power dissipation of 1.0 watts.

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 requiring 7.5 V reference
• Power supply protection and clamping applications
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging details. The TR8 suffix indicates tape and reel packaging. Confirm RoHS compliance status by checking for the e3 suffix if lead-free requirements are necessary. Ensure the component matches the required voltage tolerance and thermal specifications for the intended application environment before procurement.

Selection Notes

Select this component when a 7.5 V Zener voltage with 10% tolerance is required in a 1-watt axial package. Consider the plastic construction for lower thermal resistance compared to glass-body options. Verify that the operating temperature range and power derating curves align with the system's thermal management capabilities. Check for tighter tolerance variants if higher precision is needed.

Part Context

This part belongs to the widely used 1N47xxA series of 1-watt Zener diodes. The 'P' suffix designates the plastic encapsulated version, which offers lower thermal resistance than the glass-bodied 'G' suffix counterparts. The series covers an extensive voltage selection from 3.3 V to 100 V, providing flexibility for various voltage regulation needs in standard JEDEC packages.

Replacement Considerations

Compatible replacements include other manufacturers' 1N4737A or 1N4737AP equivalents in the DO-41 package. Surface mount alternatives such as SMAJ4737A or MLL4737A may be considered if layout changes are permissible. Verify electrical parameters and package dimensions match before substitution.