Microchip Technology 1PMT5934/TR13

Overview

1PMT5934B from Microsemi is a 24 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 19 Ω dynamic impedance at 15.6 mA test current and 700 µA max reverse leakage at 18.2 V, used for precision voltage regulation in compact power supply rails.

For engineers reviewing the 1PMT5934B datasheet, 1PMT5934B pinout, 1PMT5934B application, or 1PMT5934B 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.

Technical Context

This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1, requiring no external biasing circuitry. Its full metallic bottom and integral heat sink locking tab enable direct thermal conduction to the PCB pad, supporting stable regulation under transient load conditions.

The device exhibits tight voltage regulation across temperature (−55°C to +150°C junction/storage range) and maintains low reverse leakage (≤700 µA at VR = 18.2 V), with dynamic impedance measured using 60 Hz RMS AC superimposed on 15.6 mA DC test current per Micro Note 202.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral heat sink locking tab; cathode identified by TAB 1; weight ≈ 0.016 g; DO-216 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5934B and 1N5352B, the 1PMT5934B delivers superior thermal performance in SMT form factor, eliminates flux entrapment risk via full metallic bottom, and provides higher ESD immunity-making it optimal for space-constrained, high-reliability industrial and automotive applications.

Availability

1PMT5934B is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom DC-DC converters, and medical overvoltage protection circuits requiring stable component supply and long-term manufacturability.

Supply support for 1PMT5934B 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 to replace through-hole Zeners in space-constrained, thermally demanding applications while maintaining 3.0 W power handling and high ESD robustness in surface-mount form.

FAQ

What is the zener voltage tolerance for 1PMT5934B?

The 1PMT5934B has a standard zener voltage tolerance of ±5% at 24 V, measured at 15.6 mA test current with TAB 1 held at 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. Voltage measurement must be performed within 20 seconds of applying DC current to avoid thermal drift effects.

How is thermal management handled for 1PMT5934B in PCB layout?

Thermal management for 1PMT5934B relies on direct conduction from the junction to TAB 1, which serves as both cathode and thermal interface. The device's 30°C/W junction-to-TAB thermal resistance requires a minimum copper pour connected to TAB 1. The full metallic bottom eliminates flux entrapment, ensuring reliable solder wetting and thermal transfer during reflow.

What is the maximum reverse leakage current for 1PMT5934B?

The maximum reverse leakage current for 1PMT5934B is 700 µA at a reverse voltage of 18.2 V and ambient temperature of 30°C. This value is specified in the Electrical Characteristics table and reflects worst-case leakage under defined test conditions, supporting low-power standby operation in regulation circuits.

Is 1PMT5934B compatible with automated SMT assembly processes?

Yes, 1PMT5934B is fully compatible with automated SMT assembly. It is supplied in EIA-481 tape-and-reel format (3,000 pieces per 7-inch reel), features a DO-216 outline optimized for pick-and-place, and its Powermite® package includes a locking tab that prevents rotation during placement. The full metallic bottom also ensures consistent solder paste release and wetting.

What does the "B" suffix in 1PMT5934B indicate?

The "B" suffix in 1PMT5934B denotes compliance with Microsemi's standard product revision level and indicates the device meets all specifications in MSC0995 Rev F, including 3.0 W power rating, ±5% zener tolerance, and >16 kV HBM ESD rating. It distinguishes this qualified production version from engineering samples or earlier revisions.