1N4739CP/TR8

Overview

The Microchip Technology 1N4739CP/TR8 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. It provides voltage regulation with a nominal Zener voltage of 9.1 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 maximum dynamic impedance of 5.0 Ohms at a test current of 28 mA. It includes a TR suffix for tape and reel packaging.

Feature Summary

• Provides precise voltage regulation with a ±2% tolerance on nominal Zener voltage
• Features flexible axial-lead mounting terminals suitable for standard through-hole applications
• Constructed with a void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Offers broad operating current and temperature range stability

Applications

• Voltage regulation circuits requiring high precision
• Power supply reference voltage generation
• Overvoltage protection in electronic systems

Procurement Notes

Verify that the specific part number matches the required ±2% tolerance designation ('C' suffix) and the tape and reel packaging format ('TR' suffix). Confirm the manufacturer origin as Microchip or its predecessor entities like Microsemi, as these devices are JEDEC registered. Ensure compliance with RoHS requirements if applicable, typically denoted by an 'e3' suffix, though this specific part number does not explicitly include it.

Selection Notes

Select this component when a stable 9.1 V reference with tighter than standard 5% tolerance is needed. The plastic DO-41 package offers lower thermal resistance compared to glass-body options. Consider the maximum power dissipation of 1.0 watt and derating curves for high-temperature environments. Verify that the 28 mA test current aligns with the circuit design requirements for optimal impedance performance.

Part Context

This device belongs to the popular 1N4728A through 1N4764A series of 1.0-watt Zener diodes. The series covers a wide voltage selection from 3.3 to 100 volts. The 'P' suffix indicates plastic construction, while the 'C' suffix specifies the tighter 2% voltage tolerance. These components are widely used in general-purpose electronics where reliable voltage clamping or regulation is essential.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4739A variants with matching 9.1 V and 1 W ratings. For tighter tolerance needs, ensure the replacement also carries a C-suffix designation. Glass-body equivalents exist but may have different thermal characteristics.