1N4742CP/TR12

Overview

The Microchip Technology 1N4742CP/TR12 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 axial lead package. It provides voltage regulation with a nominal Zener voltage of 12 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 a maximum dynamic impedance of 9 Ohms at a test current of 21 mA. It is supplied in tape and reel packaging.

Feature Summary

• Provides precise voltage regulation with a standard ±2% tolerance on nominal Zener voltage
• Features flexible axial-lead mounting terminals for through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Operates reliably over a broad operating current and temperature range

Applications

• Voltage regulation circuits requiring stable reference voltages
• Protection against voltage spikes and transients
• Power supply output stabilization

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic construction, 'C' denotes the ±2% voltage tolerance, and 'TR12' specifies the tape and reel packaging format. Confirm RoHS compliance status if environmental regulations apply to the assembly process. Ensure the component meets the specific thermal and electrical requirements of the target design before finalizing procurement.

Selection Notes

Select this component when a 12 V regulated voltage is needed with high precision (±2%) compared to standard 5% or 10% variants. The 1.0 W power dissipation rating supports higher current applications than lower-power counterparts. The plastic DO-41 package offers lower thermal resistance than glass-body options, making it suitable for environments where efficient heat dissipation is critical.

Part Context

This part belongs to the widely used 1N47xx series of 1-watt Zener diodes, which covers a voltage selection from 3.3 V to 100 V. The series is JEDEC registered and available in various screening levels, including military standards via specific prefixes. The plastic encapsulation variant provides moisture classification Level 1, eliminating the need for dry pack storage prior to use.

Replacement Considerations

Equivalent parts include other 12 V Zener diodes with ±2% tolerance and 1 W power rating in the DO-41 package. Verify compatibility regarding dynamic impedance, reverse leakage current, and thermal resistance characteristics when substituting.