Microchip Technology 1PMT5942E3/TR13

Overview

1PMT5942E3/TR13 from Microsemi is a 51 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 70 Ω dynamic impedance at 7.3 mA test current and 1100 µA max reverse leakage at 38.8 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial control modules.

For engineers reviewing the 1PMT5942E3/TR13 datasheet, 1PMT5942E3/TR13 pinout, 1PMT5942E3/TR13 application, or 1PMT5942E3/TR13 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance (400 Ω at 0.25 mA), and compatibility with EIA-481 tape-and-reel automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its Powermite® package features a full metallic bottom for flux-free soldering and an integral locking tab acting as a thermal path to PCB copper, enabling efficient heat transfer from junction to TAB 1.

The device exhibits tight voltage regulation with 70 Ω dynamic impedance at I_ZT = 7.3 mA and maintains low reverse leakage (≤1100 µA at V_R = 38.8 V), supporting reliable clamping in transient-suppression circuits where thermal stability and ESD robustness (>16 kV HBM) are critical.

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; compatible with EIA-481 tape-and-reel (13-inch reel, 12,000 pcs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5942B and BZX84-C51, the 1PMT5942E3/TR13 uniquely delivers 3.0 W SMT power handling with integrated thermal management via TAB 1, making it the only option among the three suitable for high-reliability industrial power rail clamping with automated manufacturing support.

Availability

1PMT5942E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and telecom DC/DC converter designs requiring stable component supply and long-term lifecycle continuity.

Supply support for 1PMT5942E3/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 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 and transient suppression in compact, thermally optimized packages for mission-critical power systems.

FAQ

What is the Zener voltage tolerance for 1PMT5942E3/TR13?

The 1PMT5942E3/TR13 has a nominal Zener voltage of 51 V with a standard tolerance of ±5%, measured at I_ZT = 7.3 mA and TAB 1 temperature of 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D, respectively, but the E3 suffix denotes the standard ±5% version. This tolerance directly impacts regulation accuracy in voltage reference and clamping applications.

How is thermal performance specified for 1PMT5942E3/TR13?

The 1PMT5942E3/TR13 specifies a thermal resistance of 30°C/W from junction to TAB 1, meaning each watt of dissipated power raises the junction temperature by 30°C above the TAB 1 temperature. This value assumes proper soldering of TAB 1 to adequate PCB copper area. At 60°C TAB temperature, the device sustains its full 3.0 W rating - exceeding this TAB temperature requires derating per the datasheet curve.

Is 1PMT5942E3/TR13 suitable for automated SMT assembly?

Yes, the 1PMT5942E3/TR13 is fully compatible with automated surface-mount assembly. It ships in EIA-481 compliant tape-and-reel format (13-inch reel, 12,000 pieces), and its Powermite® package features a locking tab and full metallic bottom engineered to prevent flux entrapment and ensure reliable placement and reflow. The package geometry meets industry-standard pick-and-place machine requirements.

What is the maximum reverse leakage current for 1PMT5942E3/TR13?

The maximum reverse leakage current for 1PMT5942E3/TR13 is 1100 µA at a reverse voltage of 38.8 V and ambient temperature of 30°C. This parameter is critical for low-power standby circuits, as excessive leakage can increase quiescent current. The value reflects worst-case behavior under specified test conditions and remains stable across the –55°C to +150°C operating junction temperature range.

Does 1PMT5942E3/TR13 have ESD protection built-in?

Yes, the 1PMT5942E3/TR13 has an ESD rating exceeding 16 kV per the Human Body Model (HBM), as verified per JEDEC JS-001. This intrinsic robustness is achieved through process-level design and packaging, eliminating the need for external ESD protection in many applications. It supports safe handling during manufacturing and improves system-level resilience against electrostatic discharge events in end equipment.