Microchip Technology 1PMT5931B/TR13

Overview

1PMT5931B/TR13 from Microsemi is a 18 V, ±5% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 12 Ω dynamic impedance at 20.8 mA test current and 650 µA max reverse leakage at 13.7 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback paths.

For engineers reviewing the 1PMT5931B/TR13 datasheet, 1PMT5931B/TR13 pinout, 1PMT5931B/TR13 application, or 1PMT5931B/TR13 equivalent, key selection criteria include its 18 V nominal Zener voltage, 3.0 W thermal capability with metallic-tab heat sinking, low 12 Ω Zener impedance, ESD rating >16 kV HBM, and compatibility with automated SMT assembly per EIA-481 tape-and-reel packaging.

Technical Context

This device operates as a two-terminal voltage-regulating diode with cathode designated by TAB 1. Its Zener voltage is specified at 20.8 mA (IZT) with junction-to-tab thermal resistance of 30°C/W, enabling stable regulation under moderate power dissipation when mounted to a PCB copper pour or heatsink.

The Powermite® package integrates a full metallic bottom and locking tab that functions as both mechanical anchor and thermal path. Reverse leakage remains ≤650 µA at VR = 13.7 V, and knee current is 0.25 mA - confirming sharp breakdown onset suitable for low-current reference use.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral locking tab; cathode identified by TAB 1; weight ≈ 0.016 g; compatible with EIA-481 tape-and-reel (TR13 = 13-inch reel, 12,000 pcs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5931B and SZ1SMA5931E-TP, the 1PMT5931B/TR13 delivers superior thermal performance in SMT layouts due to its metallic-tab construction and 30°C/W junction-to-tab resistance - enabling full 3.0 W operation without external heatsinks in typical industrial PCB environments.

Availability

1PMT5931B/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, factory automation I/O modules, and battery-powered sensor transmitters requiring stable component supply and long-term obsolescence management.

Supply support for 1PMT5931B/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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The Powermite® Zener diode family was designed to deliver high-power surface-mount voltage regulation with integrated thermal management - addressing the need for robust, automated-assembly-ready alternatives to axial-leaded and TO-220 Zeners in harsh-environment power systems.

FAQ

What is the Zener voltage tolerance for 1PMT5931B/TR13?

The 1PMT5931B/TR13 has a standard Zener voltage tolerance of ±5% at 18 V, measured at 20.8 mA test current with TAB 1 held at 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D respectively, but the TR13 reel contains the standard ±5% version. This tolerance directly impacts regulation accuracy in feedback and reference applications.

How is thermal performance achieved in the 1PMT5931B/TR13 package?

The 1PMT5931B/TR13 achieves thermal performance via its Powermite® package's full metallic bottom and integral locking tab, which serve as the cathode (TAB 1) and primary thermal path. With a specified junction-to-TAB1 thermal resistance of 30°C/W, the device transfers heat efficiently to PCB copper pours, enabling full 3.0 W dissipation at TAB 1 = 60°C without external heatsinks.

Can the 1PMT5931B/TR13 be used in place of axial Zener diodes like 1N5931B?

No - the 1PMT5931B/TR13 is not a drop-in replacement for axial devices like 1N5931B due to fundamental differences in package, thermal path, and mounting method. While both share 18 V Zener voltage and ±5% tolerance, the 1PMT5931B/TR13 requires SMT footprint and relies on TAB 1 for thermal conduction, whereas 1N5931B uses axial leads and ambient-air cooling. PCB redesign is necessary.

What is the maximum reverse leakage current for 1PMT5931B/TR13 at 13.7 V?

The maximum reverse leakage current for 1PMT5931B/TR13 is 650 µA at VR = 13.7 V, as specified in the Electrical Characteristics table. This value is critical for low-power bias networks and high-impedance feedback paths, where excessive leakage could shift operating points or increase quiescent current beyond system limits.

Is the 1PMT5931B/TR13 compatible with lead-free reflow profiles?

Yes, the 1PMT5931B/TR13 is qualified for standard lead-free reflow profiles, including peak temperatures up to 260°C for 10 seconds, as confirmed by Microsemi's qualification testing. Its molded Powermite® package and metallic terminations meet JEDEC J-STD-020 requirements, supporting compatibility with automated SMT assembly lines using Pb-free solder paste.