Microchip Technology 1PMT5934/TR7

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 and overvoltage protection in compact DC power 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 (0.25 Ω at IZK), and compatibility with EIA-481 tape-and-reel automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its Powermite® package features a full metallic bottom for flux-free soldering and an integral locking tab acting as both mechanical anchor and heat sink.

Designed for high-reliability surface-mount applications, it delivers 3.0 W power handling with thermal resistance of 30°C/W from junction to TAB 1, and supports automatic insertion equipment due to its molded, symmetric mechanical profile and cathode designation via TAB 1.

Key Specifications

Pinout & Package

The 1PMT5934B uses a DO-216–compatible Powermite® surface-mount package with two terminals: TAB 1 (cathode) and the opposite lead (anode). The full metallic bottom serves as the cathode connection and primary thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1PMT5934B, the 1N5355B offers higher surge capacity but sacrifices SMT density and thermal performance, while the SZ1SMA5928-TP meets automotive qualification at the cost of 1/3 the power rating and significantly reduced thermal conductivity - making 1PMT5934B optimal for space-limited industrial 3 W regulation.

Availability

1PMT5934B is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU protection, medical sensor biasing, and telecom line card protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.

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 designed to deliver high-power surface-mount voltage regulation in minimal PCB area, targeting applications where thermal performance, automated assembly yield, and long-term reliability outweigh cost-per-watt optimization.

FAQ

What is the maximum power dissipation rating for the 1PMT5934B?

The 1PMT5934B is rated for 3.0 W DC power dissipation when the TAB 1 temperature is maintained at 60°C. This rating assumes proper thermal management via PCB copper area or thermal vias, as its junction-to-TAB thermal resistance is 30°C/W. Exceeding this condition risks parametric shift or permanent failure.

How is cathode identification implemented on the 1PMT5934B?

The cathode of the 1PMT5934B is designated by TAB 1, which is the larger metallic surface on the package bottom. This full-metal tab serves as both the cathode electrical connection and the primary thermal conduction path to the PCB, and must be routed to the appropriate low-impedance return node in the circuit layout.

Does the 1PMT5934B meet any ESD immunity standards?

Yes, the 1PMT5934B has an ESD rating exceeding 16 kV per the Human Body Model (HBM), as verified per ANSI/ESDA/JEDEC JS-001. This level of immunity allows direct integration into systems exposed to handling or environmental electrostatic discharge without requiring additional protection circuitry upstream of the device.

What packaging format is available for the 1PMT5934B?

The 1PMT5934B is supplied in EIA Standard 481 tape-and-reel format: 3,000 pieces per 7-inch reel and 12,000 pieces per 13-inch reel. This packaging supports fully automated SMT placement and is compatible with industry-standard pick-and-place feeders and vision alignment systems.

Can the 1PMT5934B be used in automotive applications?

The 1PMT5934B operates across –55°C to +150°C junction temperature and meets industrial reliability requirements, but it is not AEC-Q200 qualified. For automotive applications requiring formal qualification, consider alternatives like Vishay SZ1SMA5928-TP; however, 1PMT5934B remains suitable for non-safety-critical under-hood subsystems where full qualification is not mandated.