1N4740P/TR8

Overview

The Microchip Technology 1N4740P/TR8 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 with a nominal Zener voltage of 10 V and 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 7 Ohms at a test current of 25 mA. It includes a maximum reverse current of 10 µA and a forward voltage of 1.2 V at 200 mA.

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

Procurement Notes

Verify the specific suffix configuration against official datasheets to confirm tolerance and packaging details. Confirm RoHS compliance status as standard versions may differ from e3 variants. Ensure compatibility with existing thermal management designs given the 1.0 W power dissipation rating and plastic encapsulation characteristics.

Selection Notes

Select this component when a 10 V Zener voltage with ±10% tolerance is required in an axial package. Consider the plastic construction for lower thermal resistance compared to glass-body options. Evaluate the 7 Ohm dynamic impedance and 10 µA reverse leakage against circuit sensitivity requirements. Verify that the 1.0 W power rating meets the application's steady-state and surge current demands.

Part Context

This part belongs to the widely used 1N4728A through 1N4764A series of 1.0 Watt Zener diodes registered by JEDEC. The 'P' suffix designates the plastic DO-41 encapsulation, while 'TR8' indicates tape and reel packaging. The series offers extensive voltage selection from 3.3 to 100 volts, serving as a standard solution for general voltage regulation tasks in industrial and commercial electronics.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4740A or 1N4740B diodes in DO-41 packages. Surface mount equivalents such as SMAJ4740A are available for space-constrained designs. Verify that replacement devices match the 10 V nominal voltage, ±10% tolerance, and 1.0 W power dissipation ratings.