1N4743P/TR12

Overview

The Microchip Technology 1N4743P/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 13 V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features a maximum power dissipation of 1.0 watts at 25°C. Electrical characteristics include a test current of 19 mA, a maximum dynamic impedance of 10 ohms, and a maximum reverse current of 5 µA.

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
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation circuits requiring 13 V reference
• Power supply protection against overvoltage conditions
• General-purpose electronic equipment utilizing axial-lead components

Procurement Notes

Verify that the ordering suffix TR12 corresponds to the tape and reel packaging option specified by the EIA-296 standard in the official datasheet. Confirm the manufacturer origin, as this part number originates from the Microsemi Scottsdale Division, now part of Microchip Technology. Ensure compliance requirements match the specific terminal plating options available for this series.

Selection Notes

Select this component when a 13 V Zener voltage with ±5% tolerance is required in a plastic axial-lead package. The 1.0-watt power rating supports steady-state operation up to 105°C lead temperature or 45°C ambient on FR4 boards. Consider the lower thermal resistance of the plastic body compared to glass-body options if thermal management is a priority.

Part Context

This device belongs to the popular 1N4728AP through 1N4764AP series of 1.0-watt Zener diodes. The series offers an extensive voltage selection from 3.3 to 100 volts. The 'P' suffix designates the plastic construction variant, which provides lower thermal resistance compared to the glass-body (G suffix) option for the same JEDEC part numbers.

Replacement Considerations

Equivalent parts include 1N4743A, 1N4743PE3, and 1N4743UR/TR. Surface mount equivalents are available as SMAJ4743A or MLL4743A.