Microchip Technology 1PMT5947/TR13

Overview

1PMT5947B from Microsemi is a 82 V, 3.0 W surface-mount Zener diode in the Powermite® package (DO-216), featuring 4.6 mA test current, 160 Ω dynamic impedance at IZT, 2500 µA max reverse leakage at 1 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 1PMT5947B datasheet, 1PMT5947B pinout, 1PMT5947B application, or 1PMT5947B equivalent, key selection factors include its 82 V nominal Zener voltage with ±5% tolerance, 3.0 W DC power dissipation at TAB 1 = 60°C, low knee impedance (0.25 Ω), ESD rating >16 kV HBM, and compatibility with automated SMT insertion equipment.

Technical Context

This Zener diode operates with a defined 82 V nominal breakdown voltage at 4.6 mA test current (IZT), exhibiting tight regulation via low dynamic impedance (160 Ω) and minimal knee impedance (0.25 Ω), enabling stable reference performance under varying load conditions. Its DO-216 package integrates a full metallic bottom and locking tab for enhanced thermal conduction and flux-free soldering.

The device supports operation across -55°C to +150°C junction temperature range, with reverse leakage capped at 2500 µA at 1 V and forward voltage of 1.2 V at 200 mA. Thermal resistance from junction to TAB 1 is 30°C/W, directly supporting power dissipation up to 3.0 W when tab temperature is maintained at 60°C.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216) surface-mount molded package with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ82A and BZX84-C82, the 1PMT5947B uniquely combines 3.0 W continuous power handling, DO-216 thermal design with TAB 1 heat sinking, and precision Zener characteristics-making it irreplaceable in high-stability, high-power voltage reference roles.

Availability

1PMT5947B is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial overvoltage clamps, sensor excitation circuits, and programmable voltage references requiring stable component supply and long-term manufacturability.

Supply support for 1PMT5947B 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 RF solutions for aerospace, defense, and industrial markets.

The Powermite® Zener series-including 1PMT5947B-is engineered for high-power surface-mount voltage regulation and transient clamping in space-constrained, thermally demanding applications.

FAQ

What is the Zener voltage tolerance for 1PMT5947B?

The 1PMT5947B has a standard Zener voltage tolerance of ±5% at 82 V nominal. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. Voltage is measured at 4.6 mA test current with TAB 1 held at 30°C, and readings must be taken within 20 seconds of applying DC current to ensure accuracy per Microsemi Note 202.

How is thermal management implemented in the 1PMT5947B package?

The 1PMT5947B uses the Powermite® DO-216 package with TAB 1 as the cathode and primary thermal path. Its 30°C/W junction-to-TAB thermal resistance requires direct soldering of TAB 1 to a copper thermal pad on the PCB. At TAB 1 = 60°C, the device safely dissipates its full 3.0 W rating-no external heatsink needed if board layout provides adequate copper area.

Can 1PMT5947B be used in automated SMT assembly lines?

Yes, the 1PMT5947B is fully compatible with automated insertion equipment. It ships in EIA-481 standard tape-and-reel format (7″ reel: 3,000 pcs; 13″ reel: 12,000 pcs) and features a unique locking tab that prevents rotation during placement. The full metallic bottom eliminates solder flux entrapment, ensuring reliable reflow solder joints in high-volume manufacturing.

What is the maximum reverse leakage current for 1PMT5947B?

The 1PMT5947B specifies a maximum reverse leakage current (IR) of 2500 µA at 1 V reverse voltage and TL = 30°C. This value reflects worst-case leakage under light bias and confirms suitability for low-power standby circuits. At voltages below the 82 V Zener threshold, leakage remains well within this limit, supporting stable reference behavior in precision applications.

Is the 1PMT5947B RoHS compliant and lead-free?

Microsemi's Powermite® Zener diodes-including the 1PMT5947B-are manufactured to meet RoHS Directive 2011/65/EU requirements. The device uses lead-free terminations and halogen-free molding compound. Full compliance documentation, including material declarations and test reports, is available upon request from Aetrix Electronics for design validation and regulatory submission.