Microchip Technology 1PMT5940/TR7

Overview

1PMT5940/TR7 from Microsemi is a 43 V, 3.0 W surface-mount Zener diode in the Powermite® package (DO-216), featuring 8.7 mA test current, 53 Ω dynamic impedance at I_ZT, 1 µA max reverse leakage at 32.7 V, and thermal resistance of 30°C/W junction-to-tab. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and ESD protection circuits.

For engineers reviewing the 1PMT5940/TR7 datasheet, 1PMT5940/TR7 pinout, 1PMT5940/TR7 application, or 1PMT5940/TR7 equivalent, key selection criteria include zener voltage tolerance (±5% standard), low knee impedance (0.25 Ω at I_ZK), ESD rating >16 kV HBM, full metallic bottom for flux-free soldering, and compatibility with automated insertion equipment.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its 43 V nominal zener voltage. Its DO-216 Powermite® package integrates a locking tab that functions as both mechanical anchor and thermal path to PCB copper, enabling efficient heat dissipation at 3.0 W DC power dissipation when tab temperature is held at 60°C.

The device exhibits low reverse leakage (≤1 µA at 32.7 V) and stable dynamic impedance (53 Ω at 8.7 mA), supporting reliable clamping in transient suppression and reference applications. Junction-to-tab thermal resistance is specified at 30°C/W, confirming direct thermal coupling between semiconductor die and mounting tab.

Key Specifications

Pinout & Package

Package: DO-216 (Powermite®) surface-mount molded package with full metallic bottom and integral locking tab; cathode designated by TAB 1; weight ≈ 0.016 g; mounting position unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4749A and BZX84-C43, the 1PMT5940/TR7 delivers 3× higher power handling, superior thermal coupling via TAB 1, and automated assembly readiness - making it the only option among the three qualified for 3.0 W SMT clamping with flux-free soldering.

Availability

1PMT5940/TR7 is available at Aetrix Electronics and suitable for DC power supply regulation, ESD protection circuits, overvoltage clamping in battery management, and reference voltage sourcing in sensor signal conditioning requiring stable component supply and consistent tape-and-reel delivery.

Supply support for 1PMT5940/TR7 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, including 1PMT5940/TR7, was engineered for high-power surface-mount voltage regulation and transient suppression where thermal performance, assembly robustness, and ESD resilience are critical.

FAQ

What is the zener voltage tolerance for 1PMT5940/TR7?

The standard 1PMT5940/TR7 has a zener voltage tolerance of ±5% at 43 V, measured at 8.7 mA test current and TAB1 temperature of 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. This tolerance directly impacts regulation accuracy in precision reference applications, and the 1PMT5940/TR7's specification ensures predictable clamping behavior across production lots.

How does the Powermite® package improve thermal performance of 1PMT5940/TR7?

The Powermite® package of 1PMT5940/TR7 features a full metallic bottom and integral locking tab (TAB 1) that serves as both mechanical anchor and primary thermal path. With a specified junction-to-tab thermal resistance of 30°C/W, the 1PMT5940/TR7 can dissipate its full 3.0 W rating when TAB 1 is maintained at 60°C - eliminating need for external heatsinks in most PCB layouts.

Is 1PMT5940/TR7 compatible with automated assembly processes?

Yes, 1PMT5940/TR7 is explicitly designed for compatibility with automatic insertion equipment and SMT reflow processes. Its DO-216 footprint, locking tab geometry, and EIA-481 tape-and-reel packaging (7″ reel, 3,000 pcs) ensure reliable pick-and-place placement and flux-free soldering due to the full metallic bottom - a key advantage over conventional SOD packages.

What is the maximum reverse leakage current for 1PMT5940/TR7?

The maximum reverse leakage current for 1PMT5940/TR7 is 1 µA at a reverse voltage of 32.7 V and ambient temperature of 30°C. This low leakage supports energy-efficient bias networks and minimizes loading effects in high-impedance reference circuits - a critical parameter confirmed in the Microsemi MSC0995 datasheet for the 1PMT5940/TR7 family.

Does 1PMT5940/TR7 meet industry ESD standards?

Yes, 1PMT5940/TR7 is rated for >16 kV per Human Body Model (HBM), exceeding JEDEC JS-001 requirements for robust ESD immunity. This rating is validated per standardized test methodology and reflects the device's ability to survive common handling and system-level electrostatic events without parametric shift or failure - a key reliability attribute documented for the 1PMT5940/TR7 in its official specifications.