1N4748P/TR8

Overview

The Microchip Technology 1N4748P/TR8 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, providing voltage regulation with a nominal Zener voltage of 22 V and a standard tolerance of ±5%. It operates within a temperature range of -65°C to +150°C and features a plastic DO-41 (DO-204AL) axial-lead package. The device has a maximum dynamic impedance of 23 Ohms at a test current of 11.5 mA, a maximum reverse leakage current of 5 µA, and a forward voltage of 1.2 V maximum 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 22 V reference
• Power supply protection and clamping applications
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify the specific ordering suffix requirements against the manufacturer's documentation to ensure correct packaging and compliance specifications. Confirm that the TR suffix aligns with tape-and-reel handling needs. Cross-reference the part number with the official datasheet to validate electrical characteristics and mechanical dimensions before finalizing procurement orders.

Selection Notes

Select this component when a 22 V Zener voltage with ±5% tolerance is required in a 1-watt power rating. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Ensure the application environment stays within the specified -65°C to +150°C operating temperature range and utilizes appropriate lead lengths for thermal management.

Part Context

This part belongs to the popular 1N4728AP through 1N4764AP series of 1.0-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series provides extensive voltage selection from 3.3 to 100 volts. The 'P' suffix designates the plastic encapsulated construction, which is JEDEC registered and available in various screening levels.

Replacement Considerations

Compatible substitutes include other 1N4748 variants such as 1N4748A or 1N4748B, provided they meet the 22 V, 1 W, and ±5% tolerance specifications. Verify package compatibility and thermal characteristics when substituting.