1N4742P/TR12

Overview

The Microchip Technology 1N4742P/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 a TR12 tape and reel configuration. It provides voltage regulation at a nominal Zener voltage of 12 V with a standard tolerance of ±5%. 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 includes a maximum reverse current of 5 µA at a test voltage of 76 V and supports a steady-state power dissipation of 1.0 watts.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• 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
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation circuits requiring 12 V reference
• Power supply protection against overvoltage conditions
• Clamping applications for transient voltage suppression

Procurement Notes

Verify that the specific part number suffix matches the required packaging format, as the TR12 designation indicates a specific tape and reel quantity. Confirm RoHS compliance status if environmental regulations apply, noting that the base P suffix denotes plastic construction while e3 indicates lead-free plating. Ensure the procurement order aligns with the manufacturer's minimum order multiples for the reel configuration.

Selection Notes

Select this component when a 12 V Zener voltage with 5% tolerance is required for high-power dissipation up to 1 watt. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the maximum reverse current and dynamic impedance specifications to ensure compatibility with the circuit's leakage and stability requirements under varying load conditions.

Part Context

This component belongs to the widely used 1N47xx series of silicon Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers a voltage selection from 3.3 to 100 volts. The 'P' suffix identifies the plastic encapsulated variant, which is distinct from the glass-body 'G' suffix option. These devices are JEDEC registered and designed for general-purpose voltage regulation tasks.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4742A or 1N4742AP diodes in the DO-41 package. Verify that replacement components match the 12 V nominal voltage, 1 W power rating, and ±5% tolerance. Ensure the substitute device supports the same axial-lead mounting and operating temperature range.