1N4735E3/TR13

Overview

The Microchip Technology 1N4735E3/TR13 is a silicon 1-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) package. It features a nominal Zener voltage of 5.1 V with a standard 5% tolerance. Key electrical parameters include a test current of 49 mA, maximum dynamic impedance of 7 ohms at IZT, and a maximum reverse current of 1 µA at 10 V. The device supports a steady-state power dissipation of 1.0 W at lead temperatures below 105°C or ambient temperatures below 45°C on an FR4 board. It operates within a temperature range of -65°C to +150°C and offers RoHS compliance via the e3 suffix.

Feature Summary

• Provides voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard PCB integration
• 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 in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in analog signal processing

Procurement Notes

Verify that the part number includes the TR13 suffix to confirm tape and reel packaging as specified. Ensure the e3 suffix is present to guarantee RoHS compliance and annealed matte-tin plating. Confirm the P suffix indicates the plastic DO-41 package variant rather than the glass-body option. Cross-reference the specific lot code against Microsemi’s current manufacturing status to ensure availability and authenticity before finalizing procurement orders.

Selection Notes

Select this component when a 5.1 V reference with 5% tolerance is required in a 1-watt axial-lead package. Consider the plastic construction for lower thermal resistance compared to glass-body options. Evaluate the 7-ohm dynamic impedance for applications requiring moderate regulation precision. Ensure the operating environment stays within the specified thermal derating curves for sustained 1-watt dissipation.

Part Context

This device belongs to the widely used 1N47xx series of silicon Zener diodes manufactured by Microsemi's Scottsdale Division. The series covers voltages from 3.3 V to 100 V, offering extensive selection for various regulation needs. The 1N4735 variant specifically targets the 5.1 V range, a common reference point in digital logic circuits. The plastic encapsulation provides moisture classification Level 1, eliminating the need for dry pack storage.

Replacement Considerations

Surface mount equivalents are available as SMAJ4735A or MLL4735A. Glass-body versions exist under the G suffix designation but offer different thermal characteristics. Military screening levels are accessible via MQ, MX, MV, or MSP prefixes for enhanced reliability requirements.