Microchip Technology 1PMT5941/TR13

Overview

1PMT5941B from Microsemi is a 47 V, 3.0 W surface-mount Zener diode in the Powermite® package (DO-216), featuring 8.0 mA test current, 67 Ω dynamic impedance at IZT, 1.0 µA max reverse leakage at 35.8 V, and thermal resistance of 30°C/W junction-to-tab. It serves as a precision voltage reference or overvoltage clamp in power supply regulation circuits.

For engineers reviewing the 1PMT5941B datasheet, 1PMT5941B pinout, 1PMT5941B application, or 1PMT5941B equivalent, key selection criteria include its 47 V nominal Zener voltage with ±5% tolerance, 3.0 W DC power dissipation at TAB 1 = 60°C, ESD rating >16 kV HBM, full metallic bottom for flux-free soldering, and compatibility with automated insertion equipment.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations and temperature shifts. Its DO-216 package integrates a locking tab acting as both mechanical anchor and integral heat sink, with cathode designated by TAB 1 and thermal path optimized to the metallic bottom.

Rated for -55°C to +150°C junction/storage temperature, it delivers low reverse leakage (≤1.0 µA at VR = 35.8 V) and tight knee characteristics (IZK = 0.25 mA, ZZK = 1000 Ω), enabling reliable clamping in transient suppression and feedback sensing applications where stability under low-current bias matters.

Key Specifications

Pinout & Package

Package: DO-216 (Powermite®), molded surface-mount with full metallic bottom and integral locking tab (cathode designated by TAB 1). Mounting orientation is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ47A and BZX84-C47, the 1PMT5941B uniquely combines 3.0 W DC power handling, Zener-mode precision regulation, and integrated thermal management-making it the only option among the three qualified for continuous-voltage-reference and high-reliability industrial clamping roles.

Availability

1PMT5941B is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial overvoltage protection circuits, programmable voltage references, and ESD-sensitive interface protection requiring stable component supply and consistent parametric performance across production lots.

Supply support for 1PMT5941B 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 in ultra-compact form factors-specifically addressing thermal, mechanical, and manufacturability challenges in dense power electronics layouts.

FAQ

What is the Zener voltage tolerance for 1PMT5941B?

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

Can 1PMT5941B be used in place of a through-hole Zener diode like 1N5284B?

No-1PMT5941B is not a drop-in replacement for 1N5284B. While both are 47 V Zeners, 1PMT5941B uses DO-216 surface-mount packaging with TAB 1 cathode and integral heat sink, whereas 1N5284B is DO-35 through-hole. Thermal performance, mounting method, and PCB layout are incompatible without redesign.

What is the maximum continuous power dissipation for 1PMT5941B?

The 1PMT5941B is rated for 3.0 W DC power dissipation when TAB 1 is maintained at 60°C. Derating is required above this temperature; the device's thermal resistance is 30°C/W junction-to-TAB1, so junction temperature rises linearly with power and ambient conditions.

Does 1PMT5941B have polarity marking, and how is cathode identified?

Yes-the cathode of 1PMT5941B is unambiguously designated by TAB 1, which is the larger metallic pad on the DO-216 package. This is confirmed in the Mechanical Characteristics section of MSC0995 Rev F and is critical for correct orientation during placement and thermal design.

Is tape-and-reel packaging available for 1PMT5941B, and what are the standard reel sizes?

Yes-1PMT5941B is supplied in EIA Standard 481 tape-and-reel format: 3,000 pieces per 7-inch reel and 12,000 pieces per 13-inch reel. This packaging supports automated SMT assembly and is documented in the Packaging section of the MSC0995 datasheet.