Microchip Technology 1PMT5940E3/TR13

Overview

1PMT5940E3/TR13 from Microsemi is a 43 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 53 Ω dynamic impedance at 8.7 mA test current and 950 µA max reverse leakage at 32.7 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial control modules.

For engineers reviewing the 1PMT5940E3/TR13 datasheet, 1PMT5940E3/TR13 pinout, 1PMT5940E3/TR13 application, or 1PMT5940E3/TR13 equivalent, key selection criteria include its 43 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, ESD rating >16 kV HBM, and compatibility with automated SMT placement equipment.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across load variations and temperature shifts. Its full metallic bottom and integral locking tab provide low thermal resistance (30°C/W junction-to-TAB1) and reliable heat transfer during sustained 3.0 W operation.

The device exhibits tight regulation with 53 Ω dynamic impedance at I_ZT = 8.7 mA and maintains ≤950 µA reverse leakage at V_R = 32.7 V, supporting robust performance in voltage reference and protection circuits where stability under varying bias conditions is critical.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216), molded surface-mount package with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1PMT5940E3/TR13, SMCJ43A offers superior transient energy handling but lacks DC regulation accuracy, while BZX84-C43 fits ultra-compact layouts but requires significant derating for any sustained power dissipation above 300 mW.

Availability

1PMT5940E3/TR13 is available at Aetrix Electronics and suitable for industrial power supply monitoring, automotive body control modules, telecom DC-DC converter feedback, and medical sensor signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for 1PMT5940E3/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 engineered for high-power density surface-mount voltage regulation and transient protection in space-constrained, thermally demanding environments.

FAQ

What is the Zener voltage tolerance for 1PMT5940E3/TR13?

The 1PMT5940E3/TR13 has a standard Zener voltage tolerance of ±5% at 43 V, measured at I_ZT = 8.7 mA with TAB 1 held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D, but the E3 suffix denotes the standard ±5% grade. This tolerance directly impacts voltage reference accuracy in feedback and monitoring circuits using the 1PMT5940E3/TR13.

How is thermal management implemented for 1PMT5940E3/TR13?

The 1PMT5940E3/TR13 relies on its metallic TAB 1 as the primary thermal path, with a specified junction-to-tab thermal resistance of 30°C/W. To achieve the full 3.0 W power rating, TAB 1 must be soldered to a minimum 100 mm² copper area on the PCB. The integral locking tab enhances thermal contact and mechanical stability during reflow, making the 1PMT5940E3/TR13 suitable for high-reliability thermal designs.

Is 1PMT5940E3/TR13 compatible with automated SMT placement equipment?

Yes, the 1PMT5940E3/TR13 is explicitly designed for compatibility with automatic insertion and SMT placement equipment. Its Powermite® package features consistent dimensional control (per DO-216), a flat metallic bottom for vacuum nozzle pickup, and a locking tab that prevents rotation during placement - all confirmed in the MSC0995.PDF datasheet. These attributes ensure high-yield assembly when using the 1PMT5940E3/TR13 in volume production.

What is the maximum reverse leakage current for 1PMT5940E3/TR13?

The maximum reverse leakage current for 1PMT5940E3/TR13 is 950 µA at V_R = 32.7 V and T_L = 30°C. This value is specified in the Electrical Characteristics table of the MSC0995.PDF datasheet and reflects worst-case leakage under defined test conditions. Low leakage is critical when the 1PMT5940E3/TR13 is used in high-impedance reference or sensing paths where error current must be minimized.

Does 1PMT5940E3/TR13 meet industry ESD standards?

Yes, the 1PMT5940E3/TR13 has an ESD rating exceeding 16 kV per the Human Body Model (HBM), as stated in the FEATURES section of the MSC0995.PDF datasheet. This level of intrinsic ESD robustness eliminates the need for additional protection components in many applications and simplifies handling and board-level integration of the 1PMT5940E3/TR13 in manufacturing and field environments.