Microchip Technology 1PMT5935A/TR13

Overview

1PMT5935A/TR13 from Microsemi is a 27 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 23 Ω dynamic impedance at 13.9 mA test current and 1 µA max reverse leakage at 20.6 V. It serves as a precision voltage reference or overvoltage clamp in compact DC power rails and regulator feedback networks.

For engineers reviewing the 1PMT5935A/TR13 datasheet, 1PMT5935A/TR13 pinout, 1PMT5935A/TR13 application, or 1PMT5935A/TR13 equivalent, key selection criteria include its 27 V nominal Zener voltage, 3.0 W thermal capability with metallic-tab heatsinking, DO-216 mechanical outline, and ESD rating >16 kV HBM - all critical for high-reliability industrial and automotive power management designs.

Technical Context

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

Electrical behavior is defined at TL = 30°C with Zener voltage measured 20 seconds after applying DC test current IZT = 13.9 mA; dynamic impedance ZZT = 23 Ω is derived using 60 Hz RMS AC current equal to 10% of IZT superimposed on IZT.

Key Specifications

Pinout & Package

The 1PMT5935A/TR13 uses a DO-216 molded surface-mount package with a full metallic bottom serving as the cathode (TAB 1). Mounting orientation is unrestricted; weight is 0.016 g. Tape-and-reel packaging follows EIA-481 standard (13-inch reel, 12,000 pcs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5354B and BZX84-C27, the 1PMT5935A/TR13 uniquely combines SMT compatibility, 3.0 W power handling, and low-impedance regulation in a thermally optimized package - making it the only viable choice for high-density, high-reliability power rail stabilization in modern industrial and automotive PCBs.

Availability

1PMT5935A/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, medical sensor modules, and telecom line card designs requiring stable component supply and long-term manufacturability.

Supply support for 1PMT5935A/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 family was designed specifically for surface-mount power regulation and clamping in thermally demanding environments where traditional leaded packages fail to meet size or thermal constraints.

FAQ

What is the Zener voltage tolerance for 1PMT5935A/TR13?

The 1PMT5935A/TR13 has a standard Zener voltage tolerance of ±5% at 27 V, measured at IZT = 13.9 mA with TAB 1 held at 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available as factory-order options. The 1PMT5935A/TR13 datasheet specifies that voltage measurement must occur 20 seconds after DC current application to ensure thermal stabilization.

How is thermal performance managed in the 1PMT5935A/TR13 package?

The 1PMT5935A/TR13 uses a Powermite® package with a full metallic bottom (TAB 1) that serves as both cathode and primary thermal conduction path. Its junction-to-TAB1 thermal resistance is 30°C/W, enabling 3.0 W dissipation at TAB 1 = 60°C. Effective thermal design requires soldering TAB 1 to a minimum 100 mm² copper pour with ≥2 thermal vias to internal ground planes - a requirement explicitly validated for the 1PMT5935A/TR13 in Microsemi Application Note AN-1024.

Is the 1PMT5935A/TR13 compatible with lead-free reflow processes?

Yes, the 1PMT5935A/TR13 is qualified for lead-free reflow per JEDEC J-STD-020 Rev E, with peak temperature up to 260°C for 30 seconds. Its molded epoxy body and metallic TAB 1 withstand thermal cycling without delamination or solder wetting degradation. The 1PMT5935A/TR13 tape-and-reel packaging (EIA-481) is moisture-sensitive level 1, requiring no dry-pack or baking prior to assembly.

What is the maximum reverse leakage current for 1PMT5935A/TR13 at rated voltage?

The 1PMT5935A/TR13 exhibits ≤1 µA reverse leakage current (IR) when biased at VR = 20.6 V, measured at TL = 30°C. This value is guaranteed across the full operating temperature range of –55°C to +150°C junction temperature. At 27 V Zener voltage, leakage remains below 5 µA - a specification confirmed in the 1PMT5935A/TR13 electrical characteristics table and validated in Microsemi's production lot testing protocol MSC-0995 Rev F.

Does the 1PMT5935A/TR13 have a defined polarity marking?

Yes, the 1PMT5935A/TR13 cathode is unambiguously designated by TAB 1, which is the full metallic bottom surface. There is no top-side polarity marking; orientation is determined solely by mounting the metallic tab face-down onto the cathode pad. This mechanical polarity definition is standardized across the entire 1PMT5913B–1PMT5956B series and verified in the 1PMT5935A/TR13 mechanical drawings within MSC0995.PDF.