1N4738CPE3/TR12

Overview

The Microchip Technology 1N4738CPE3/TR12 is a silicon Zener diode in the 1N4728AP through 1N4764AP series, manufactured by Microsemi. It provides voltage regulation with a nominal Zener voltage of 8.2 V and a tight tolerance of +/- 2%, indicated by the 'C' suffix. The device features a plastic DO-41 (DO-204AL) axial lead package and operates within a temperature range of -65°C to +150°C. Key electrical parameters include a maximum dynamic impedance of 4.5 Ohms at a test current of 31 mA, a maximum reverse current of 10 µA, and a power dissipation rating of 1.0 W at 25°C.

Feature Summary

• Provides precise voltage regulation with a standard 2% tolerance on nominal Zener voltage.
• Utilizes a void-free transfer molded thermosetting epoxy body for robust mechanical protection.
• Offers flexible axial-lead mounting terminals suitable for through-hole applications.
• Compliant with RoHS standards and classified as Level 1 moisture sensitivity.

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection in electronic systems
• General-purpose voltage regulation

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'P' indicates plastic construction, 'e3' confirms RoHS compliance, and 'TR12' denotes tape and reel packaging. Confirm the 'C' suffix corresponds to the necessary 2% voltage tolerance. Ensure the component meets the specific thermal and electrical requirements of the target application before procurement.

Selection Notes

Select this component when a 2% voltage tolerance is required for the 8.2 V Zener voltage level. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Verify that the operating environment stays within the specified temperature range and that the power dissipation limits are respected under steady-state conditions.

Part Context

This part belongs to the widely used 1N4728A through 1N4764A series of 1.0 Watt Zener diodes. The series covers a broad selection of voltages from 3.3 V to 100 V. The 'C' suffix specifically identifies the tighter 2% tolerance variant, distinguishing it from the standard 5% ('A') or 10% (no suffix) versions available in the same family.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4738A devices with matching 8.2 V and 2% tolerance specifications. For plastic axial packages, verify compatibility with the DO-41 form factor. Military screening prefixes such as MV may be considered if higher reliability standards are required.

FAQ

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

The 'C' suffix signifies that the Zener voltage has a tolerance of plus or minus 2%, which is tighter than the standard 5% tolerance offered by the 'A' suffix.

Is this component RoHS compliant?

Yes, the 'e3' suffix in the part number indicates that the device is RoHS compliant and features annealed matte-Tin plating.

What is the maximum power dissipation rating?

The maximum power dissipation is 1.0 watt at an ambient temperature of 25°C, with derating required for higher temperatures.