Microchip Technology 1PMT5931C/TR13

Overview

1PMT5931C/TR13 from Microsemi is a 18 V, ±1% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 12 Ω dynamic impedance at 20.8 mA test current 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 1PMT5931C/TR13 datasheet, 1PMT5931C/TR13 pinout, 1PMT5931C/TR13 application, or 1PMT5931C/TR13 equivalent, key selection criteria include zener voltage tolerance (±1%), low knee impedance (650 Ω at 0.25 mA), ESD rating (>16 kV HBM), junction temperature range (–55°C to +150°C), and tape-and-reel packaging per EIA-481 (13-inch reel, 12,000 pcs).

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its Powermite® package integrates a full metallic bottom and locking tab that functions as both mechanical anchor and thermal path to PCB copper, enabling efficient heat transfer from junction to tab (30°C/W) and supporting automated placement.

The device exhibits low reverse leakage (≤1 µA at 13.7 V), stable dynamic impedance (12 Ω at I_ZT = 20.8 mA), and a defined knee region (I_ZK = 0.25 mA, Z_ZK = 650 Ω), making it suitable for low-current reference and transient suppression where tight voltage stability and repeatable turn-on behavior are required.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral 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 SMF18A and BZX84-C18, the 1PMT5931C/TR13 delivers 3× higher power rating, superior thermal performance via metallic tab, and tighter ±1% tolerance-making it uniquely suited for industrial and automotive voltage regulation where precision, power, and reliability coexist.

Availability

1PMT5931C/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive ECUs, and medical instrumentation requiring stable component supply with guaranteed traceability and long-term lifecycle support.

Supply support for 1PMT5931C/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 RF solutions for aerospace, defense, industrial, and communications markets.

The Powermite® Zener diode product line was designed to deliver high-power surface-mount voltage regulation with integrated thermal management-addressing the need for robust, automated-assembly-compatible alternatives to legacy DO-41 and DO-204 packages.

FAQ

What is the zener voltage tolerance of 1PMT5931C/TR13?

The 1PMT5931C/TR13 has a zener voltage tolerance of ±1%, as indicated by the "C" suffix in the part number. This is confirmed in Note 1 of the MSC0995.PDF datasheet, which states that suffix C denotes 1% tolerance. The nominal voltage is 18 V, so the actual measured V_Z at I_ZT = 20.8 mA falls between 17.82 V and 18.18 V under standard test conditions (T_C = 30°C).

How is thermal management implemented in the 1PMT5931C/TR13 package?

The 1PMT5931C/TR13 uses Microsemi's Powermite® package with a full metallic bottom and an integral locking tab (TAB 1) that serves as both mechanical anchor and primary thermal path. Its specified thermal resistance is 30°C/W junction-to-TAB1, meaning effective heat transfer requires soldering TAB 1 to a thermally robust PCB copper area. This design eliminates flux entrapment and enables 3.0 W power dissipation at TAB 1 = 60°C-unachievable with standard plastic SMD packages.

What does the "TR13" suffix indicate in 1PMT5931C/TR13?

The "TR13" suffix in 1PMT5931C/TR13 specifies tape-and-reel packaging per EIA Standard 481 on a 13-inch reel containing 12,000 units. This is explicitly stated in the "PACKAGING" section of MSC0995.PDF. The TR13 format supports high-volume automated pick-and-place assembly and is distinct from the 7-inch reel option (TR7, 3,000 pcs) also offered for this family.

Can 1PMT5931C/TR13 be used as a replacement for through-hole Zener diodes like 1N5245B?

The 1PMT5931C/TR13 is not a direct drop-in replacement for 1N5245B due to differing package, thermal path, and power derating behavior. While both are 18 V Zeners, the 1N5245B is a 0.5 W DO-35 device with no integrated heatsink tab. The 1PMT5931C/TR13 delivers 3.0 W with tab heatsinking but requires PCB layout adaptation-specifically, a thermal pad connected to TAB 1. Its use demands verification of thermal performance under actual board conditions.

What is the maximum reverse leakage current for 1PMT5931C/TR13 at its rated reverse voltage?

The maximum reverse leakage current for 1PMT5931C/TR13 is 1 µA at a reverse voltage of 13.7 V, as specified in the Electrical Characteristics table of MSC0995.PDF. This value is measured at T_L = 30°C and reflects the device's ability to maintain high-impedance blocking behavior below breakdown-critical for low-power reference and sensing applications where leakage-induced error must be minimized.