1N4739CPE3/TR12

Overview

The Microchip Technology 1N4739CPE3/TR12 is a silicon Zener diode with a nominal voltage of 9.1 V and a tight tolerance of ±2%. It operates in the DO-41 axial package, dissipating up to 1.0 W at 25°C. The device features a maximum dynamic impedance of 5.0 Ohms at a test current of 28 mA and a maximum reverse leakage current of 10 µA. It supports an operating temperature range from -65°C to +150°C.

Feature Summary

• Provides precise voltage regulation with a 2% tolerance for sensitive circuitry
• Utilizes plastic encapsulation offering lower thermal resistance compared to glass-body options
• Compliant with RoHS standards through the e3 suffix designation

Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources requiring stable breakdown characteristics
• Protection circuits utilizing ESD-resistant properties per MIL-STD-750 Method 1020

Procurement Notes

Verify that the specific ordering suffix matches the required tolerance and packaging configuration. Confirm the presence of the 'e3' suffix indicates RoHS compliance and matte-tin plating. Ensure the 'TR12' suffix aligns with the intended reel quantity and tape-and-reel specifications before finalizing procurement orders.

Selection Notes

Select this component when a 9.1 V reference requires tighter stability than standard 5% or 10% variants. The C suffix specifically denotes the 2% tolerance band. Consider the DO-41 package dimensions and lead spacing for PCB layout compatibility. Evaluate thermal derating requirements if ambient temperatures exceed 25°C.

Part Context

This part belongs to the 1N4728AP through 1N4764AP series of 1-watt plastic Zener diodes manufactured by Microsemi (now Microchip). The series covers voltages from 3.3 V to 100 V. The 'P' suffix identifies the plastic molded epoxy body, while the 'C' suffix specifies the 2% voltage tolerance tier within the JEDEC registered lineup.

Replacement Considerations

Equivalent parts include 1N4739CP and 1N4739C without the RoHS or reel suffixes. Surface mount alternatives are available as SMAJ4739A or MLL4739A. Verify pinout and thermal characteristics match when substituting.