Microchip Technology 1N4758E3/TR13

Overview

1N4758E3/TR13 from Microsemi is a 1.0 W, 56 V ±5% Zener diode in DO-41 plastic package, rated for 4.5 mA test current, 110 Ω dynamic impedance at I_ZT, and 2000 mA maximum surge current. It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range (–65°C to +150°C).

For engineers reviewing the 1N4758E3/TR13 datasheet, 1N4758E3/TR13 pinout, 1N4758E3/TR13 application, or 1N4758E3/TR13 equivalent, key selection factors include its 56 V nominal Zener voltage with 5% tolerance, 1.0 W steady-state dissipation at T_L < 105°C, RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR13) for automated assembly.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its 56 V regulation point targets mid-range voltage reference needs where tighter tolerances (e.g., ±1% or ±2%) are not required but robust thermal performance and surge resilience are critical.

The device uses silicon junction technology with void-free thermosetting epoxy encapsulation (UL94V-0), cathode band polarity marking, and JEDEC-standard DO-41 mechanical form factor. Thermal resistance is 45°C/W junction-to-lead at 10 mm lead length, enabling reliable operation without forced cooling in compact PCB layouts.

Key Specifications

Pinout & Package

DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with 1N4758A and MMSZ5256ET1G, the 1N4758E3/TR13 uniquely combines full 1.0 W dissipation, RoHS compliance, tape-and-reel automation readiness, and JEDEC-standard axial-leaded form factor-making it optimal for new industrial power supply designs requiring regulatory compliance and manufacturing scalability.

Availability

1N4758E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, and automotive body control units requiring stable component supply with full RoHS compliance and automated assembly support.

Supply support for 1N4758E3/TR13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and timing solutions for aerospace, defense, and industrial markets.

The 1N47xxA series was designed specifically for general-purpose voltage regulation in cost-sensitive, high-volume power conversion and protection applications-balancing precision, ruggedness, and manufacturability.

FAQ

What is the Zener voltage tolerance of the 1N4758E3/TR13?

The 1N4758E3/TR13 has a nominal Zener voltage of 56 V with a tolerance of ±5%, as indicated by the "A" suffix in the base part number. This tolerance is verified at 4.5 mA test current and 25°C lead temperature. The "e3" suffix denotes RoHS compliance and does not affect voltage specification. Designers should account for this 5% variation when setting regulation margins in feedback networks.

Does the 1N4758E3/TR13 require dry packing before PCB assembly?

No, the 1N4758E3/TR13 does not require dry packing. It is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and assembled indefinitely at ambient conditions without baking. This eliminates moisture-related popcorning risk during reflow and simplifies inventory handling for the 1N4758E3/TR13 in high-mix manufacturing environments.

What is the maximum steady-state power dissipation for the 1N4758E3/TR13?

The 1N4758E3/TR13 is rated for 1.0 W steady-state power dissipation when lead temperature (T_L) is maintained below 105°C at 10 mm from the body, or when ambient temperature (T_A) remains below 45°C on FR4 board with specified copper area. Derating is required above these temperatures per Figure 1 in the Microsemi datasheet, and the 1N4758E3/TR13 must not exceed this limit to ensure long-term reliability.

How is polarity marked on the 1N4758E3/TR13?

The 1N4758E3/TR13 uses a cathode band to indicate polarity: the banded end is the cathode and must be held at a higher potential than the anode to achieve Zener regulation. This marking conforms to JEDEC DO-41 standards and is visible on the black epoxy body. Incorrect orientation will result in forward conduction (≈1.2 V drop) instead of 56 V regulation, potentially damaging the 1N4758E3/TR13 or downstream circuitry.

What does the "TR13" suffix mean in 1N4758E3/TR13?

The "TR13" suffix in 1N4758E3/TR13 indicates tape-and-reel packaging per EIA-296 standard, with 13-inch reels. This format supports automated surface-mount and through-hole placement equipment. The "e3" portion confirms RoHS-compliant matte-tin plating, while "TR13" specifies packaging-both are critical for procurement and line setup. The 1N4758E3/TR13 reel quantity is typically 5,000 pieces per reel.