1N4742CP/TR8

Overview

The Microchip Technology 1N4742CP/TR8 is a silicon 1-watt Zener diode in the 1N4728A to 1N4764A series. 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 plastic DO-41 (DO-204AL) axial-lead package. Electrical characteristics include a maximum dynamic impedance of 9 Ohms at a test current of 21 mA, a maximum reverse current of 5 µA at 7.6 V, and a forward voltage of 1.2 V maximum at 200 mA.

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.
• Offers extensive voltage selection across the series from 3.3 to 100 volts.

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 ordering suffix matches the required specifications. The 'P' suffix indicates plastic encapsulation, while 'TR' denotes tape and reel packaging per EIA-296 standards. Confirm whether RoHS compliance is required, which necessitates the 'e3' suffix for annealed matte-tin plating. Ensure the specific tolerance level corresponding to the 'C' suffix aligns with design requirements before procurement.

Selection Notes

Select this component when a 12 V reference with high precision is needed. The ±2% tolerance offers tighter control than standard 5% or 10% variants. Consider the 1 W power dissipation capability and the thermal resistance of 45 °C/W junction-to-lead. Verify compatibility with the DO-41 package dimensions and lead spacing for the target PCB layout.

Part Context

This part belongs to the Microsemi Scottsdale Division 1N4728AP through 1N4764AP series of silicon 1-watt Zener diodes. The series utilizes JEDEC registered type numbers and is available in both glass and plastic encapsulated options. The plastic version provides lower thermal resistance compared to the glass-body option, making it suitable for general-purpose voltage regulation applications requiring robust construction.

Replacement Considerations

Equivalent parts within the same series include 1N4742A (±10%), 1N4742AP (±5%), and 1N4742APE3 (RoHS compliant). Surface mount equivalents such as SMAJ4742A or MLL4742A are also available. Verify that substitute components match the required ±2% tolerance and package style.

FAQ

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

The 'C' suffix signifies a standard voltage tolerance of plus or minus 2% 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.

What is the moisture classification of the plastic encapsulated version?

The plastic encapsulated Zeners are moisture classified as Level 1 per IPC/JEDEC J-STD-020B, requiring no dry pack.