Microchip Technology 1N5366AE3/TR13

Overview

1N5366AE3/TR13 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 39 V, ±10% tolerance (A suffix), 30 mA test current (IZT), 14 Ω dynamic impedance (ZZ), and maximum reverse current of 0.5 μA at 29.7 V (VR). It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.

For engineers reviewing the 1N5366AE3/TR13 datasheet, 1N5366AE3/TR13 pinout, 1N5366AE3/TR13 application, or 1N5366AE3/TR13 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (170 A), voltage regulation (ΔVZ = 3.1 V), and RoHS-compliant matte-tin plating per MIL-STD-750.

Technical Context

This device functions as a two-terminal voltage regulator operating in reverse breakdown, maintaining stable output voltage across wide current (10–50% of IZM) and temperature ranges. Its low dynamic impedance (14 Ω) and tight ΔVZ (3.1 V) ensure minimal voltage drift under load variation.

The 1N5366AE3/TR13 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 5 W steady-state dissipation at TL < 25 °C (3/8″ lead length), and exhibits 0.7 g mass and IPC/JEDEC J-STD-020B Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

Package: T-18 axial-leaded plastic case (void-free thermosetting epoxy, UL94V-0), cathode indicated by colored band. Leads are annealed matte-tin plated (RoHS compliant, 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 1N5366B and MMBZ5267ET1G, the 1N5366AE3/TR13 offers the highest power handling (5 W) and lowest dynamic impedance (14 Ω) among these three, making it optimal for high-current regulation and transient clamping where thermal margin and voltage stability are critical.

Availability

1N5366AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line card protection, programmable current sources, and automotive battery monitoring requiring stable component supply and long-term lifecycle support.

Supply support for 1N5366AE3/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 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and JEDEC-standardized parametric consistency.

FAQ

What is the Zener voltage tolerance for 1N5366AE3/TR13?

The 1N5366AE3/TR13 has a ±10% Zener voltage tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means its measured VZ at 30 mA falls between 35.1 V and 42.9 V at 25 °C. The "e3" suffix confirms RoHS compliance, and "TR13" denotes tape-and-reel packaging per EIA-296. This tolerance is broader than the ±5% offered by the 1N5366B variant but sufficient for non-critical reference applications.

How does thermal resistance affect 1N5366AE3/TR13 power handling?

The 1N5366AE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W, meaning it can safely dissipate its full 5 W rating when lead temperature (TL) is held below 25 °C - typically achieved with ≥10 mm lead length from the body. On FR4 PCBs, its junction-to-ambient resistance rises to 85 °C/W, limiting steady-state power to 1.47 W unless copper pads and traces are enlarged. This directly impacts layout decisions for heat sinking.

Is 1N5366AE3/TR13 suitable for surge protection?

Yes - the 1N5366AE3/TR13 is rated for 170 A peak surge current (IZSM) in an 8.3 ms half-sine waveform, making it suitable for clamping short-duration transients in DC power rails. Its low 14 Ω dynamic impedance ensures fast response, and its 3.1 V voltage regulation (ΔVZ) guarantees predictable clamping window. However, repeated surges require verification of cumulative thermal stress per derating curve in Figure 1 of the datasheet.

What does the "TR13" suffix mean in 1N5366AE3/TR13?

The "TR13" suffix indicates tape-and-reel packaging per EIA-296 standard, with 13-inch reels. This format supports automated pick-and-place assembly and ensures controlled handling for RoHS-compliant matte-tin leads. The base part 1N5366AE3 remains electrically and thermally identical; TR13 adds logistics and manufacturing compatibility without altering device specifications or performance.

Can 1N5366AE3/TR13 replace 1N5366B in existing designs?

Yes, the 1N5366AE3/TR13 is physically and electrically pin-compatible with 1N5366B, sharing identical T-18 package, 39 V nominal VZ, 30 mA IZT, and 14 Ω ZZ. The only functional difference is the wider ±10% tolerance (vs. ±5% for 1N5366B), which may affect closed-loop accuracy in precision feedback circuits. No PCB or layout changes are needed, but system-level validation of regulation error is recommended.