1N4743CP/TR12

Overview

The Microchip Technology 1N4743CP/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 with a nominal Zener voltage of 13V and a tight tolerance of ±1%, indicated by the 'C' suffix. The device operates within a temperature range of -65°C to +150°C and features a maximum dynamic impedance of 9.9 Ohms at a test current of 19mA. It includes a tape and reel option for automated assembly.

Feature Summary

• Provides precise voltage regulation with a standard ±1% tolerance on nominal Zener voltage.
• Features flexible axial-lead mounting terminals suitable for through-hole applications.
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards.
• Moisture classified as Level 1 per IPC/JEDEC J-STD-020B, requiring no dry pack.

Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources in electronic circuits
• Protection against voltage transients

Procurement Notes

Verify that the part number suffix matches the required specifications: 'P' indicates plastic construction, 'C' denotes a ±1% voltage tolerance, and 'TR' specifies tape and reel packaging. Confirm RoHS compliance status based on the presence of the 'e3' suffix if applicable. Ensure the procurement order aligns with the specific JEDEC registration requirements for the 1N4743A series.

Selection Notes

Select this component when a 13V reference with high precision is required in an axial-lead package. The ±1% tolerance makes it suitable for applications demanding strict voltage accuracy compared to standard 5% or 10% variants. Consider the thermal resistance characteristics and power derating curves for high-temperature environments to ensure reliable operation within the specified junction-to-lead limits.

Part Context

This component belongs to the popular 1N4728AP through 1N4764AP series of 1.0-watt Zener diodes manufactured by Microsemi (now Microchip). The series offers extensive voltage selection from 3.3V to 100V. The 1N4743 variant specifically targets the 13V regulation point within this lineup, utilizing plastic encapsulation for lower thermal resistance compared to glass-body options.

Replacement Considerations

Equivalent parts include other 13V Zener diodes with similar power ratings and tolerances. Surface mount equivalents are available in SMAJ and MLL packages. Verify compatibility regarding package dimensions, lead configuration, and electrical parameters such as dynamic impedance and reverse leakage current before substitution.

FAQ

What does the 'C' suffix indicate in the part number?

The 'C' suffix signifies a standard voltage tolerance of plus or minus 1% on the nominal Zener voltage.

Is the device sensitive to electrostatic discharge?

No, the device is nonsensitive to ESD per MIL-STD-750 Method 1020.