Microchip Technology 1PMT5941B/TR7

Overview

1PMT5941B/TR7 from Microsemi is a 47 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 67 Ω dynamic impedance at 8.0 mA test current and 1000 µA max reverse leakage at 35.8 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback networks.

For engineers reviewing the 1PMT5941B/TR7 datasheet, 1PMT5941B/TR7 pinout, 1PMT5941B/TR7 application, or 1PMT5941B/TR7 equivalent, key selection criteria include its 47 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, 16 kV HBM ESD rating, and compatibility with automated SMT assembly.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage regulation under varying load and temperature conditions. Its Powermite® package features a full metallic bottom (TAB 1) acting as both cathode terminal and primary heat path, with thermal resistance of 30°C/W junction-to-TAB1.

The device exhibits low knee impedance (ZZK = 0.25 Ω) and tight Zener voltage tolerance (±5% standard), enabling reliable clamping and reference performance in industrial power supplies and automotive control modules where thermal stability and ESD robustness are critical.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216), molded surface-mount package with full metallic bottom (TAB 1) serving as cathode and thermal interface. Dimensions comply with DO-216 outline; mounting position unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF47A and BZX84-C47, the 1PMT5941B/TR7 delivers 3× higher power handling, 2× lower dynamic impedance, and superior thermal path via TAB 1-making it uniquely suited for industrial-grade 47 V regulation where reliability under thermal stress is non-negotiable.

Availability

1PMT5941B/TR7 is available at Aetrix Electronics and suitable for industrial power supply clamp, automotive ECU voltage reference, and telecom line card protection requiring stable component supply and long-term manufacturability.

Supply support for 1PMT5941B/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 family-including 1PMT5941B/TR7-is engineered for high-power surface-mount voltage regulation in harsh environments, emphasizing thermal robustness, ESD immunity, and automated assembly readiness.

FAQ

What is the Zener voltage tolerance for 1PMT5941B/TR7?

The 1PMT5941B/TR7 has a standard Zener voltage tolerance of ±5% at 47 V, measured at I_ZT = 8.0 mA with TAB 1 held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D, but the base 1PMT5941B/TR7 uses the ±5% grade per MSC0995 Rev F specification.

How is thermal management handled for 1PMT5941B/TR7?

Thermal management for 1PMT5941B/TR7 relies on TAB 1-the full metallic bottom-which serves as both cathode and primary thermal conduction path. With a junction-to-TAB1 thermal resistance of 30°C/W, effective cooling requires direct soldering to a minimum 100 mm² copper pour on the PCB. No external heatsink is needed for 3.0 W operation at TAB 1 ≤ 60°C.

Is 1PMT5941B/TR7 compatible with lead-free reflow processes?

Yes, 1PMT5941B/TR7 is qualified for lead-free reflow per J-STD-020. Its Powermite® package withstands peak temperatures up to 260°C for 20–40 seconds. The device's –55°C to +150°C junction temperature range and flux-entrapment–free metallic bottom ensure reliability through multiple thermal cycles without delamination or parameter shift.

What does the "TR7" suffix indicate in 1PMT5941B/TR7?

The "TR7" suffix denotes tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format is optimized for automated SMT placement equipment. The "B" in 1PMT5941B indicates ±5% Zener voltage tolerance; "TR7" adds no electrical change-it specifies only packaging configuration and quantity.

Can 1PMT5941B/TR7 be used as a replacement for through-hole 1N5284B?

No-1PMT5941B/TR7 is not a drop-in replacement for 1N5284B. While both are 47 V Zeners, 1N5284B is a 0.5 W through-hole device in DO-35 package with different thermal behavior and mounting. 1PMT5941B/TR7 delivers 3.0 W in DO-216 and requires PCB layout changes to accommodate its surface-mount footprint and thermal pad requirements.