1N4738CP/TR8

Overview

The Microchip Technology 1N4738CP/TR8 is a silicon 1-watt Zener diode housed in a plastic DO-41 (DO-204AL) axial lead package. It provides voltage regulation with a nominal Zener voltage of 8.2 volts and a tight tolerance of plus or minus 2 percent, 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 4.5 ohms at a test current of 31 mA. It is supplied in tape and reel packaging.

Feature Summary

• Provides precise voltage regulation with a 2% tolerance on nominal Zener voltage
• Utilizes a void-free transfer molded thermosetting epoxy body for moisture resistance
• Features flexible axial-lead mounting terminals suitable for through-hole applications
• Operates reliably across a broad temperature range from -65°C to +150°C

Applications

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

Procurement Notes

Verify the specific ordering suffixes to confirm the exact electrical tolerances and packaging configuration required for your design. Ensure that the plastic construction meets the thermal and environmental constraints of your application. Confirm RoHS compliance status if applicable, as standard versions may differ from compliant variants. Cross-reference the datasheet specifications with your system requirements before finalizing procurement.

Selection Notes

Select this component when a 2% voltage tolerance is necessary for accurate regulation, distinguishing it from standard 5% or 10% variants. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the 1-watt power dissipation rating and ensure adequate heat sinking or derating is applied based on ambient operating temperatures to maintain reliability.

Part Context

This part belongs to the extensive 1N4728A through 1N4764A series of 1-watt Zener diodes manufactured by Microsemi, now part of Microchip Technology. The series covers a wide voltage selection from 3.3 to 100 volts. The 'P' suffix denotes plastic encapsulation, while the 'C' suffix specifically indicates the tighter 2% voltage tolerance available for this series.

Replacement Considerations

Surface mount equivalents are available in SMAJ4738 and MLL4738 packages. For military screening levels, prefixes such as MV can be added to the base part number. Verify pin compatibility and thermal characteristics when substituting with other manufacturers' 1N4738 variants.