Microchip Technology 1PMT5953/TR13

Overview

1PMT5953B from Microsemi is a 150 V, 3.0 W surface-mount Zener diode in the Powermite® package, featuring 2.5 mA test current, 600 Ω dynamic impedance at IZT, 1 kV reverse voltage rating, and 16.5 mA maximum Zener current. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and transient protection circuits.

For engineers reviewing the 1PMT5953B datasheet, 1PMT5953B pinout, 1PMT5953B application, or 1PMT5953B equivalent, key selection criteria include its 150 V nominal Zener voltage, ±5% tolerance (standard), 30°C/W junction-to-tab thermal resistance, ESD rating >16 kV HBM, and compatibility with automated SMT assembly using EIA-481 tape-and-reel packaging.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations and temperature shifts. Its Powermite® package integrates a full metallic bottom and locking tab for enhanced thermal conduction and mechanical stability during reflow soldering.

Designed for DC voltage regulation and transient suppression, it delivers low reverse leakage (<1 µA at VR = 1 kV), tight knee characteristics (IZK = 0.25 mA), and predictable Zener impedance behavior under 60 Hz AC superposition 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 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 1N5377B and PLZ150B, the 1PMT5953B uniquely combines 3.0 W SMT capability, integrated thermal tab, and >16 kV ESD robustness-making it optimal for space-constrained, high-reliability industrial and automotive clamping applications requiring no layout change from through-hole alternatives.

Availability

1PMT5953B is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive body control module clamp, medical imaging HV bias reference, and telecom line card overvoltage protection requiring stable component supply and long-term lifecycle support.

Supply support for 1PMT5953B 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 suppression in harsh-environment systems where thermal management and ESD resilience are critical.

FAQ

What is the Zener voltage tolerance for 1PMT5953B?

The standard 1PMT5953B has a Zener voltage tolerance of ±5% at 150 V nominal. Tighter tolerances are available: ±2% with suffix C (1PMT5953C) and ±1% with suffix D (1PMT5953D). All variants share identical thermal, mechanical, and ESD specifications. The 1PMT5953B datasheet confirms VZ measurement at IZT = 2.5 mA and TC = 30°C.

How is thermal performance defined for 1PMT5953B?

1PMT5953B has a junction-to-tab thermal resistance of 30°C/W, measured from die to TAB 1. At 3.0 W dissipation, this yields a 90°C temperature rise above tab temperature. To maintain TJ ≤ 150°C, TAB 1 must be held at ≤60°C-achievable via adequate PCB copper area. The 1PMT5953B Powermite® package uses its metallic bottom and locking tab as the primary thermal path.

Can 1PMT5953B be used in automated SMT assembly?

Yes, 1PMT5953B is qualified for automated surface-mount assembly using EIA-481 tape-and-reel packaging (7″ reel: 3,000 pcs; 13″ reel: 12,000 pcs). Its Powermite® package features a full metallic bottom that prevents solder flux entrapment, and its locking tab ensures mechanical stability during pick-and-place and reflow. The 1PMT5953B is explicitly designed for compatibility with automatic insertion equipment per Microsemi documentation.

What is the maximum reverse voltage rating for 1PMT5953B?

The 1PMT5953B has a maximum reverse voltage (VR) rating of 1,000 V, specified at which reverse leakage remains ≤1 µA. This rating supports use in high-voltage transient suppression and bias networks where sustained reverse stress up to 1 kV may occur. The 1PMT5953B datasheet lists VR = 1,000 V in the Electrical Characteristics table under "REVERSE VOLTAGE VR MAX".

Does 1PMT5953B meet any industry ESD standards?

Yes, 1PMT5953B is rated for >16 kV per the Human Body Model (HBM), exceeding JEDEC JS-001 Class 3B requirements. This ESD robustness is intrinsic to the device structure and packaging-no external protection is needed during board handling or assembly. The 1PMT5953B specification sheet explicitly states "ESD Rating of >16kV per human body model" in the FEATURES section.