Microchip Technology 1PMT5955A/TR13

Overview

1PMT5955A/TR13 from Microsemi is a 180 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 900 Ω dynamic impedance at 2.1 mA test current and 7000 µA max reverse leakage at 144 V, used for precision voltage regulation in high-reliability power supply feedback loops.

For engineers reviewing the 1PMT5955A/TR13 datasheet, 1PMT5955A/TR13 pinout, 1PMT5955A/TR13 application, or 1PMT5955A/TR13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (30°C/W junction-to-TAB1), 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, leveraging silicon PN-junction avalanche breakdown to maintain stable 180 V regulation under controlled reverse-bias conditions. Its design targets fixed-voltage clamping and overvoltage protection in DC-DC converter feedback networks and industrial sensor biasing circuits.

The Powermite® package integrates a full metallic bottom and locking tab that serves as both mechanical anchor and thermal path to PCB copper, enabling effective heat transfer without solder flux entrapment. Thermal resistance is specified as 30°C/W from junction to TAB 1, supporting continuous operation up to +150°C junction temperature.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral 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 1N5377B and BZX85C180, the 1PMT5955A/TR13 delivers superior thermal performance (30°C/W vs. ≥65°C/W), integrated mechanical anchoring, and guaranteed >16 kV ESD immunity-making it the preferred choice for high-reliability, high-power SMT voltage regulation.

Availability

1PMT5955A/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and sensor biasing applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for 1PMT5955A/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 to deliver high-power surface-mount voltage regulation with enhanced thermal and mechanical robustness-targeting applications where traditional axial or DO-41 devices fail to meet density, reliability, or automated assembly requirements.

FAQ

What is the zener voltage tolerance for 1PMT5955A/TR13?

The 1PMT5955A/TR13 has a standard zener voltage tolerance of ±5% at 180 V, measured at 2.1 mA test current and TAB 1 temperature of 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D respectively, but the 'A' suffix denotes the standard ±5% grade. This tolerance remains valid across the full operating junction temperature range of –55°C to +150°C.

How is thermal management handled in the 1PMT5955A/TR13 package?

The 1PMT5955A/TR13 uses the Powermite® package with a full metallic bottom and integral locking tab that functions as both mechanical anchor and primary thermal path. Its specified thermal resistance is 30°C/W from junction to TAB 1, meaning effective heat transfer requires direct soldering of TAB 1 to a thermally robust PCB copper area. This design eliminates reliance on lead-frame conduction alone.

Is the 1PMT5955A/TR13 compatible with standard SMT reflow processes?

Yes, the 1PMT5955A/TR13 is qualified for standard lead-free reflow profiles per J-STD-020. Its molded Powermite® package withstands peak temperatures up to 260°C, and the full metallic bottom prevents solder flux entrapment-reducing voiding risk and improving long-term interfacial reliability. It is supplied in EIA-481 tape-and-reel format (13-inch reel, 12,000 pieces).

What is the maximum reverse leakage current for 1PMT5955A/TR13?

The maximum reverse leakage current for 1PMT5955A/TR13 is 7000 µA at a reverse voltage of 144 V (80% of nominal 180 V), tested at ambient temperature. This value is specified in the manufacturer's MSC0995 datasheet and reflects worst-case conduction under sub-threshold bias-critical for minimizing error current in high-impedance reference circuits.

Does the 1PMT5955A/TR13 have a documented ESD rating?

Yes, the 1PMT5955A/TR13 has a documented ESD rating of >16 kV per the Human Body Model (HBM), as stated in the official Microsemi MSC0995 datasheet. This rating applies to both terminals and confirms robustness against common handling and assembly electrostatic events-making it suitable for use in automated SMT lines and field-deployed equipment without additional protection circuitry.