Microchip Technology 1PMT5949A/TR7

Overview

1PMT5949A/TR7 from Microsemi is a 100 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 250 Ω dynamic impedance at 3.7 mA test current and 3100 µA max reverse leakage at 76 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial control modules.

For engineers reviewing the 1PMT5949A/TR7 datasheet, 1PMT5949A/TR7 pinout, 1PMT5949A/TR7 application, or 1PMT5949A/TR7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance, and compatibility with automated SMT assembly per EIA-481 tape-and-reel packaging.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 100 V measured at 3.7 mA (IZT) with TAB temperature held at 30°C. Its Powermite® package features a full metallic bottom and integral heat-sink locking tab, enabling direct thermal conduction from junction to PCB copper via TAB 1.

The device exhibits 250 Ω dynamic impedance (ZZT) at IZT and 3100 µA maximum reverse leakage (IR) at VR = 76 V. Thermal resistance is specified as 30°C/W from junction to TAB 1, supporting stable regulation under sustained 3.0 W dissipation when mounted on adequate copper area.

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; mounting position unrestricted; weight ≈ 0.016 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ100A and BZX84-C100, the 1PMT5949A/TR7 uniquely combines 3.0 W continuous regulation capability, 30°C/W thermal resistance via TAB 1, and >16 kV HBM rating - making it the only option among the three qualified for high-reliability, thermally demanding DC reference and clamp roles.

Availability

1PMT5949A/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, medical diagnostic equipment, and telecom power interfaces requiring stable component supply and long-term manufacturability.

Supply support for 1PMT5949A/TR7 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 surface-mount voltage regulation and transient suppression in harsh-environment systems where thermal management, ESD robustness, and long-term stability are critical.

FAQ

What is the zener voltage tolerance for 1PMT5949A/TR7?

The 1PMT5949A/TR7 has a standard zener voltage tolerance of ±5% at 100 V, measured at 3.7 mA test current with TAB temperature at 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available as custom order options. This tolerance directly impacts regulation accuracy in precision reference applications, and users should verify layout thermal design to maintain TAB temperature stability.

How is thermal management achieved in the 1PMT5949A/TR7 package?

The 1PMT5949A/TR7 uses the Powermite® package with TAB 1 as the cathode and primary thermal conduction path. Its 30°C/W junction-to-TAB thermal resistance requires direct soldering of TAB 1 to a minimum 100 mm² copper pour for full 3.0 W power dissipation capability. The full metallic bottom and locking tab enhance thermal transfer and mechanical anchoring, eliminating reliance on lead-frame conduction alone.

Is the 1PMT5949A/TR7 suitable for automatic SMT assembly?

Yes, the 1PMT5949A/TR7 is fully compatible with automated insertion and reflow processes. It ships in EIA-481 compliant tape-and-reel format (3,000 pcs per 7-inch reel), and its Powermite® package geometry - including symmetric lead placement and flat metallic bottom - ensures reliable pick-and-place accuracy and coplanarity. The flux-entrapment–free metallic bottom further improves solder joint yield in high-volume production.

What is the maximum reverse leakage current for 1PMT5949A/TR7?

The 1PMT5949A/TR7 specifies a maximum reverse leakage current (IR) of 3100 µA at VR = 76 V, measured at TL = 30°C. This value reflects worst-case leakage under near-clamp conditions and is critical for low-power standby circuits. At lower reverse voltages (e.g., <50 V), leakage drops significantly - typically below 1 µA - enabling efficient use in battery-backed or always-on monitoring systems.

Does the 1PMT5949A/TR7 meet any specific ESD standards?

Yes, the 1PMT5949A/TR7 is rated for >16 kV per the Human Body Model (HBM) ESD test (MIL-STD-883, Method 3015.7). This rating is intrinsic to the device structure and does not require external protection. It ensures robust handling during board assembly and reliable operation in end equipment exposed to routine electrostatic discharge, such as industrial control panels or field-deployed telecom hardware.