Microchip Technology 1N5366E3/TR13

Overview

1N5366E3/TR13 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 39 V, ±5% tolerance (B-suffix equivalent), 30 mA test current, 14 Ω dynamic impedance at I_ZT, and maximum reverse leakage of 0.5 μA at 29.7 V. 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 1N5366E3/TR13 datasheet, 1N5366E3/TR13 pinout, 1N5366E3/TR13 application, or 1N5366E3/TR13 equivalent, key selection criteria include Zener voltage stability under varying load current, low dynamic impedance for tight regulation, thermal resistance (25 °C/W junction-to-lead), RoHS-compliant matte-tin plating, and tape-and-reel packaging for automated assembly.

Technical Context

This device functions as a two-terminal voltage regulator in reverse-bias mode, maintaining stable output voltage across wide operating current ranges (10–50% of I_ZM). Its regulation performance is defined by ΔV_Z = 3.1 V - the voltage difference between 10% and 50% of maximum Zener current - and exhibits minimal voltage drift versus temperature due to its low thermal coefficient design.

The 1N5366E3/TR13 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 260 °C soldering (10 s), and achieves 1.47 W steady-state dissipation on FR4 PCB with specified copper pad geometry. Its surge rating is 170 A (8.3 ms half-sine), supporting transient overvoltage clamping in DC rails.

Key Specifications

Pinout & Package

Package: Axial-leaded T-18 plastic case with cathode indicated by color band; RoHS-compliant matte-tin plated leads; weight 0.7 g; moisture sensitivity level 1 (no dry pack required).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5366B and SMBJ5366B, the 1N5366E3/TR13 offers RoHS compliance and tape-and-reel packaging for automated assembly, while retaining the superior thermal path of axial leads - making it optimal for high-reliability industrial power rails where thermal management and environmental compliance are both critical.

Availability

1N5366E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, programmable logic controller I/O protection, and test equipment calibration requiring stable component supply and long-term obsolescence mitigation.

Supply support for 1N5366E3/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 and mixed-signal components for aerospace, defense, and industrial markets.

The 1N53xxB series was designed for robust voltage regulation in harsh environments, emphasizing thermal resilience, surge immunity, and long-term parametric stability under continuous DC stress.

FAQ

What is the Zener voltage tolerance of the 1N5366E3/TR13?

The 1N5366E3/TR13 has a nominal Zener voltage of 39 V with ±5% tolerance, consistent with the B-suffix variant in the 1N5333B–1N5388B family. This means its actual regulation voltage falls between 37.05 V and 40.95 V when measured at 30 mA test current and 25 °C lead temperature. The e3 suffix indicates RoHS compliance but does not alter voltage tolerance.

Can the 1N5366E3/TR13 be used in surface-mount designs?

No - the 1N5366E3/TR13 is an axial-leaded T-18 package and is not suitable for surface-mount assembly. For SMT implementation, Microsemi specifies the SMBJ5366B as the functional equivalent in SMB package. While both share identical 39 V/5 W electrical ratings, the SMBJ5366B has higher thermal resistance (100 °C/W vs. 25 °C/W junction-to-lead), requiring careful PCB layout for thermal management.

What is the maximum steady-state power dissipation of the 1N5366E3/TR13 on a standard FR4 PCB?

When mounted on a standard FR4 PCB (1 oz Cu) with 4 mm² copper pads and 1 mm track width (25 mm length), the 1N5366E3/TR13 delivers 1.47 W steady-state power dissipation at 25 °C ambient. This derated value reflects its 85 °C/W junction-to-ambient thermal resistance under those specific board conditions - significantly lower than its full 5.0 W rating achievable only with adequate heatsinking at the leads.

Does the 1N5366E3/TR13 meet MIL-STD-750 ESD requirements?

Yes - the 1N5366E3/TR13 is nonsensitive to electrostatic discharge per MIL-STD-750 Method 1020. This qualification ensures reliable handling and operation in environments with elevated ESD risk, such as automated manufacturing lines and field-service repair scenarios, without requiring additional protection circuitry during normal use.

What does the "TR13" suffix indicate in 1N5366E3/TR13?

The "TR13" suffix denotes tape-and-reel packaging per EIA-296 standard, with 13-inch reels. This format supports high-volume automated placement in SMT lines. The base part 1N5366E3 defines the RoHS-compliant, ±5% tolerance, 39 V Zener diode; TR13 adds logistics and assembly compatibility without altering electrical or thermal specifications.