1N4746CP/TR12

Overview

The Microchip Technology 1N4746CP/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 with tape and reel packaging. It provides voltage regulation at a nominal Zener voltage of 18 V with 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 a maximum dynamic impedance of 20 Ω at a test current of 14 mA. It includes a maximum reverse current of 50 μA and supports a steady-state power dissipation of 1.0 watts.

Feature Summary

• Provides precise voltage regulation with a tight ±2% tolerance on nominal Zener voltage
• Features flexible axial-lead mounting terminals for standard through-hole integration
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Operates reliably over a broad temperature range from -65°C to +150°C

Applications

• Voltage regulation in electronic circuits requiring stable reference voltages
• Protection against voltage spikes and transients in power supply lines
• Clamping applications in signal processing and communication equipment

Procurement Notes

Verify that the specific part number matches the required tolerance and packaging configuration. Confirm the manufacturer origin, as this component originates from the Microsemi Scottsdale Division now under Microchip Technology. Ensure compliance with any specific environmental or screening requirements relevant to your application before finalizing procurement.

Selection Notes

Select this component when a 18 V Zener voltage with high precision (±2%) is required in a 1-watt axial-lead package. Consider the thermal resistance characteristics and derating curves if operating near maximum power limits. Verify that the tape and reel format aligns with automated assembly processes.

Part Context

This component belongs to the JEDEC registered 1N4728A through 1N4764A series of 1.0-watt Zener diodes. The series offers extensive voltage selection from 3.3 to 100 volts. The 'P' suffix denotes plastic encapsulation, which provides lower thermal resistance compared to glass-body options. The 'TR' suffix indicates tape and reel packaging for automated handling.

Replacement Considerations

Compatible substitutes include other 1N4746 variants with matching electrical specifications. Options include the 1N4746G for glass-body construction or surface mount equivalents like the MLL4746A. Ensure replacement parts meet the same ±2% tolerance and power dissipation requirements.