1N4746CPE3/TR12

Overview

The Microchip Technology 1N4746CPE3/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 18 V and a tight tolerance of ±2%, indicated by the 'C' suffix. The device operates within a temperature range of -65°C to +150°C and features RoHS-compliant annealed matte-tin plating, denoted by the 'e3' suffix. Packaged in tape and reel format per EIA-296 standards as specified by the 'TR12' suffix, it offers flexible mounting terminals and void-free transfer molded epoxy construction.

Feature Summary

• Provides precise voltage regulation with a standard ±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
• Includes RoHS compliant annealed matte-tin plating solderable per MIL-STD-750

Applications

• Voltage regulation circuits requiring stable reference voltages
• Protection against overvoltage conditions in electronic systems
• Clipping and clamping applications in signal processing

Procurement Notes

Verify that the specific ordering suffixes match the required specifications: 'P' indicates plastic encapsulation, 'e3' confirms RoHS compliance with tin plating, and 'TR12' specifies the tape and reel packaging format. Confirm the manufacturer origin, as this part originates from the Microsemi Scottsdale Division, now part of Microchip Technology. Ensure the component meets the necessary moisture classification level and thermal resistance requirements for the intended application environment.

Selection Notes

Select this component when a 18 V Zener voltage with high precision (±2%) is required in a 1-watt power dissipation package. The plastic DO-41 case offers lower thermal resistance compared to glass-body options. Consider the operating temperature range and surge current capabilities relative to the circuit design. Verify compatibility with surface mount equivalents if space constraints change during the design phase.

Part Context

This device belongs to the JEDEC registered 1N4728A through 1N4764A series of silicon 1-watt Zener diodes. The series covers a wide voltage selection from 3.3 to 100 volts. The 'C' suffix specifically denotes the tighter 2% voltage tolerance variant, distinguishing it from the standard 5% ('A') or 10% (no suffix) versions available in the same family.

Replacement Considerations

Equivalent parts include other 18 V, 1 W Zener diodes in the DO-41 package with ±2% tolerance. Cross-reference with other manufacturers offering the 1N4746C specification. Surface mount alternatives such as SMAJ4746A or MLL4746A may be considered if footprint changes are permissible.