Microchip Technology 1PMT5943AE3/TR13

Overview

1PMT5943AE3/TR13 from Microsemi is a 56 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 86 Ω dynamic impedance at 6.7 mA test current and 1300 µA max reverse leakage at 42.6 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial control modules.

For engineers reviewing the 1PMT5943AE3/TR13 datasheet, 1PMT5943AE3/TR13 pinout, 1PMT5943AE3/TR13 application, or 1PMT5943AE3/TR13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance, and compatibility with automated SMT assembly per EIA-481 tape-and-reel packaging.

Technical Context

This Zener diode operates in reverse breakdown mode to regulate or clamp voltage with tight voltage stability across temperature (–55°C to +150°C junction/storage range). Its Powermite® package integrates a full metallic bottom and locking tab for mechanical retention and thermal conduction to PCB copper.

The device exhibits 0.25 µA max reverse current at 42.6 V (VR), 1300 µA max IR at rated VR, and a 2.5 Ω knee impedance (ZZK) at IZK = 0.25 mA - enabling stable regulation even near breakdown threshold in low-power sensing circuits.

Key Specifications

Pinout & Package

Powermite® surface-mount package: molded body with full metallic bottom, cathode designated by TAB 1, weight ≈ 0.016 g, compatible with EIA-481 tape-and-reel (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 1N5355B and BZX84-C56, the 1PMT5943AE3/TR13 delivers superior thermal performance (30°C/W), mechanical reliability in SMT lines, and 3× higher power rating - making it the preferred choice for industrial power rail protection requiring long-term stability.

Availability

1PMT5943AE3/TR13 is available at Aetrix Electronics and suitable for industrial power monitoring, PLC I/O protection, telecom line card biasing, and medical diagnostic equipment requiring stable component supply with traceable sourcing and lifecycle continuity.

Supply support for 1PMT5943AE3/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 product line was designed specifically for surface-mount power regulation and transient suppression in space-constrained, thermally demanding industrial and telecom systems.

FAQ

What is the zener voltage tolerance for 1PMT5943AE3/TR13?

The 1PMT5943AE3/TR13 has a standard zener voltage tolerance of ±5% at 56 V, measured at IZT = 6.7 mA and TAB temperature = 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D respectively, but the E3 suffix indicates the standard ±5% version. This tolerance directly affects voltage-clamping accuracy in overvoltage protection circuits using the 1PMT5943AE3/TR13.

How is thermal management handled for 1PMT5943AE3/TR13?

The 1PMT5943AE3/TR13 uses its metallic TAB 1 as the primary thermal path, with a specified junction-to-TAB thermal resistance of 30°C/W. Effective thermal management requires soldering TAB 1 to a minimum 100 mm² copper pour on the PCB. The Powermite® package's full metallic bottom and locking tab enhance heat transfer versus conventional plastic-body SMD Zeners, enabling full 3.0 W dissipation when properly mounted - a critical design factor for sustained operation of the 1PMT5943AE3/TR13.

Is 1PMT5943AE3/TR13 compatible with automated SMT assembly?

Yes, the 1PMT5943AE3/TR13 is explicitly designed for compatibility with automatic insertion equipment and standard SMT reflow processes. Its Powermite® package features consistent geometry, optical marking (device marking "943"), and EIA-481 compliant tape-and-reel packaging (TR13 = 13-inch reel, 12,000 pcs). The locking tab prevents rotation during placement, and the full metallic bottom eliminates solder flux entrapment - all verified features supporting high-yield automated assembly of the 1PMT5943AE3/TR13.

What is the maximum reverse leakage current for 1PMT5943AE3/TR13?

The maximum reverse leakage current (IR) for the 1PMT5943AE3/TR13 is 1300 µA at VR = 42.6 V, measured at TL = 30°C. At lower reverse voltages - such as 0.75 × VZ (42.6 V) - IR drops to ≤1 µA. This low-leakage behavior is essential for minimizing quiescent current in high-impedance bias networks where the 1PMT5943AE3/TR13 functions as a reference or clamp, especially in battery-powered or energy-sensitive applications.

Does 1PMT5943AE3/TR13 meet any ESD standards?

Yes, the 1PMT5943AE3/TR13 is rated for >16 kV per the Human Body Model (HBM) ESD test, as confirmed in the Microsemi MSC0995 datasheet. This high ESD immunity allows safe handling and placement in standard manufacturing environments without requiring special ESD controls beyond standard industry practice - a key reliability advantage for production lines deploying the 1PMT5943AE3/TR13 in high-volume industrial assemblies.