1N4743CP/TR8

Overview

The Microchip Technology 1N4743CP/TR8 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series. It provides voltage regulation at a nominal 13 V with a tight ±2% tolerance, indicated by the 'C' suffix. 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 10 Ohms at a test current of 19 mA, a maximum reverse current of 5 µA at 9.9 V, and a maximum regulator current of 344 mA.

Feature Summary

• Provides precise voltage regulation with a ±2% tolerance on nominal Zener voltage
• 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 broad operating current and temperature stability without ESD sensitivity

Applications

• Voltage reference circuits requiring high precision
• Overvoltage protection in power supply systems
• Clamping applications in electronic signal processing

Procurement Notes

Verify that the specific part number includes the TR8 suffix to confirm tape and reel packaging configuration. Confirm RoHS compliance status if required by assembly specifications. Ensure the ordering documentation matches the Microsemi Scottsdale Division datasheet revision C for accurate electrical parameters. Cross-reference the manufacturer's official documentation to validate the component's authenticity and screening level before procurement.

Selection Notes

Select this component when a 13 V regulation point with tighter than standard tolerances is required. The plastic encapsulation offers lower thermal resistance compared to glass-body options. Consider the axial lead format for manual or standard automated insertion processes. Evaluate the 1 W power dissipation capability against the expected load current and ambient thermal conditions to ensure safe operation within the specified junction temperature limits.

Part Context

This component belongs to the widely recognized 1N47xx series of 1-watt Zener diodes originally registered by JEDEC. Microchip Technology (formerly Microsemi) manufactures these devices in plastic packages designated by the AP suffix. The series covers a voltage range from 3.3 V to 100 V, allowing designers to select standardized parts for various regulation needs while maintaining consistent mechanical and thermal characteristics across the product line.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4743A variants with matching 13 V and 1 W ratings. For tighter tolerance requirements, verify compatibility with 1N4743C equivalents. Surface mount replacements such as SMAJ4743A are available but require different footprint considerations.