Microchip Technology 1PMT5935C/TR13

Overview

1PMT5935C/TR13 from Microsemi is a 27 V, ±1% tolerance Zener diode in the Powermite® surface-mount package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 23 Ω dynamic impedance at 13.9 mA test current and thermal resistance of 30°C/W junction-to-TAB1. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and ESD-protected analog front-ends.

For engineers reviewing the 1PMT5935C/TR13 datasheet, 1PMT5935C/TR13 pinout, 1PMT5935C/TR13 application, or 1PMT5935C/TR13 equivalent, key selection criteria include its tight 1% voltage tolerance, 16 kV HBM ESD rating, full metallic bottom for flux-free assembly, integral heat sink tab, and DO-216 mechanical outline compatibility with automated placement equipment.

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 metallic cathode tab (TAB 1) that serves as both electrical terminal and primary thermal path, enabling 3.0 W power handling despite its small footprint.

The device exhibits low reverse leakage (≤1 µA at VR = 20.6 V), a sharp knee characteristic (IZK = 0.25 mA, ZZK = 700 Ω), and stable performance from −55°C to +150°C junction temperature. Its ESD robustness (>16 kV HBM) supports use in unshielded I/O interfaces without external protection.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216), molded surface-mount package with full metallic bottom and integral heat sink locking tab. Cathode is designated by TAB 1; anode is the molded body side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C27LT1G and SMBJ27A, the 1PMT5935C/TR13 uniquely combines 3.0 W continuous DC power, ±1% voltage tolerance, and DO-216 manufacturability-making it the only option for high-accuracy, high-power Zener regulation in automated SMT production.

Availability

1PMT5935C/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, medical instrumentation references, and telecom line card surge suppression requiring stable component supply and long-term lifecycle support.

Supply support for 1PMT5935C/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 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 designed to deliver high-power, precision voltage regulation in surface-mount form factors compatible with automated manufacturing-addressing the need for robust, flux-free, thermally efficient discrete protection in harsh-environment electronics.

FAQ

What is the Zener voltage tolerance for 1PMT5935C/TR13?

The "C" suffix in 1PMT5935C/TR13 denotes ±1% Zener voltage tolerance at 13.9 mA test current and TAB 1 temperature of 30°C. This tighter tolerance enables use in precision reference applications without post-assembly calibration, unlike the standard ±5% "B" version. The 1PMT5935C/TR13 achieves this via binning during final test and is documented in MSC0995 Rev F, Note 1.

How is thermal management implemented in the 1PMT5935C/TR13 package?

The 1PMT5935C/TR13 uses its metallic TAB 1 as the primary thermal conduction path, with a specified junction-to-TAB thermal resistance of 30°C/W. To achieve full 3.0 W power dissipation, TAB 1 must be soldered to ≥1 cm² of 2-oz copper on the PCB. The full metallic bottom prevents flux entrapment, ensuring consistent thermal interface quality after reflow. This design is validated in the Powermite® mechanical specification section of MSC0995.

Is the 1PMT5935C/TR13 suitable for ESD protection in USB or Ethernet ports?

Yes-the 1PMT5935C/TR13 has an ESD rating exceeding 16 kV per Human Body Model (HBM), making it suitable for board-level ESD protection on low-speed I/O lines such as USB 2.0 D+/D− or Ethernet MDI pairs. However, its 27 V clamping voltage means it should be used downstream of higher-voltage primary protectors (e.g., 100 V MOVs) in telecom applications. This rating is confirmed in the FEATURES section of MSC0995.

What does "TR13" signify in the part number 1PMT5935C/TR13?

"TR13" indicates tape-and-reel packaging per EIA-481 standard on a 13-inch reel containing 12,000 units. This format is optimized for high-volume SMT placement equipment and ensures consistent orientation (cathode TAB 1 leading) during automated assembly. The reel dimensions and carrier tape specifications are detailed in the PACKAGING section of MSC0995.

Can the 1PMT5935C/TR13 replace the 1PMT5935B/TR13 in existing designs?

Yes-the 1PMT5935C/TR13 is a direct functional and mechanical replacement for the 1PMT5935B/TR13, differing only in Zener voltage tolerance (±1% vs. ±5%). All electrical ratings, package dimensions, thermal characteristics, and mounting requirements remain identical. No PCB layout or firmware changes are required when upgrading to the "C" version for improved voltage accuracy. This interchangeability is supported by Microsemi's family datasheet MSC0995.