1N4748P/TR12

Overview

The Microchip Technology 1N4748P/TR12 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series. It provides voltage regulation with a nominal Zener voltage of 22V and a standard tolerance of ±5%. The device operates within an ambient temperature range of -65°C to +150°C and features a plastic DO-41 (DO-204AL) axial-lead package. Electrical characteristics include a maximum dynamic impedance of 23 Ohms at a test current of 11.5 mA, a maximum reverse current of 5 µA at 5V, and a maximum regulator current of 205 mA.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Offers lower thermal resistance compared to glass-body options for equivalent JEDEC part numbers

Applications

• Voltage regulation circuits requiring 22V reference
• Power supply protection and clamping applications
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify that the specific ordering suffix matches the required packaging configuration, as the TR suffix indicates tape and reel delivery per EIA-296 standards. Confirm RoHS compliance status by checking for the e3 suffix if lead-free termination is mandatory for the assembly process. Ensure the component meets the necessary military screening levels if high reliability is required, which involves adding specific prefixes to the base part number.

Selection Notes

Select this component when a 1-watt power dissipation rating and a 22V Zener voltage are required for through-hole designs. Consider the plastic DO-41 package for its lower thermal resistance relative to glass equivalents. Verify that the ±5% tolerance aligns with circuit requirements, noting that tighter tolerances require different suffix designations. Ensure the operating environment stays within the specified -65°C to +150°C temperature limits.

Part Context

This part belongs to the popular 1N4728AP through 1N4764AP series of 1.0 watt Zener diodes manufactured by Microsemi's Scottsdale Division. The series covers a wide voltage selection from 3.3 to 100 volts. These plastic encapsulated devices are moisture classified as Level 1, eliminating the need for dry pack storage. The series includes various screening options and surface mount equivalents for diverse application needs.

Replacement Considerations

Surface mount equivalents are available as SMAJ4748A or MLL4748A. Glass-body versions exist under the same JEDEC numbering but utilize a G suffix instead of P.