Microchip Technology 1PMT5935/TR13

Overview

1PMT5935B 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 DC power rails and regulator feedback paths.

For engineers reviewing the 1PMT5935B datasheet, 1PMT5935B pinout, 1PMT5935B application, or 1PMT5935B equivalent, key selection factors include its 27 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, ESD rating >16 kV HBM, and compatibility with automated SMT placement equipment.

Technical Context

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

The device exhibits low knee impedance (700 Ω at IZK = 0.25 mA) and tight regulation across its operating range, supporting reliable clamping and reference functions in industrial power supplies and automotive control modules where ambient temperatures reach −55°C to +150°C.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216), molded surface-mount case with full metallic bottom (TAB 1) serving as cathode and thermal interface. Mounting orientation is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5355B and PLZ27B, the 1PMT5935B uniquely balances 3.0 W capability, DO-216 surface-mount compatibility, and integrated thermal tab-making it optimal for compact, high-reliability power rail protection where thermal management and automation throughput are critical.

Availability

1PMT5935B is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive engine control unit clamp, and telecom DC-DC converter reference requiring stable component supply and consistent parametric performance across production lots.

Supply support for 1PMT5935B 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 diode product line was designed for high-power density surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding applications such as motor drives and avionics power systems.

FAQ

What is the Zener voltage tolerance for 1PMT5935B?

The 1PMT5935B has a standard Zener voltage tolerance of ±5% at 27 V, measured at IZT = 13.9 mA and TAB 1 temperature of 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. The 1PMT5935B datasheet specifies that voltage measurement must occur within 20 seconds of applying DC test current to avoid thermal drift effects.

How is thermal management implemented in the 1PMT5935B package?

The 1PMT5935B uses the Powermite® package with TAB 1 as a full metallic bottom serving as both cathode terminal and primary thermal conduction path. Its junction-to-TAB1 thermal resistance is 30°C/W, enabling 3.0 W power dissipation when TAB 1 is maintained at ≤60°C. Effective thermal design requires soldering TAB 1 to a minimum 100 mm² copper area on the PCB.

Is the 1PMT5935B compatible with automated SMT assembly processes?

Yes, the 1PMT5935B is explicitly designed for compatibility with automatic insertion equipment. Its DO-216 mechanical outline, symmetric geometry, and locking tab ensure stable pick-and-place accuracy. The full metallic bottom eliminates solder flux entrapment, reducing post-reflow cleaning requirements and improving first-pass yield in high-volume SMT lines.

What is the maximum reverse leakage current for 1PMT5935B?

The 1PMT5935B has a maximum reverse leakage current of 1 µA at VR = 20.6 V and TL = 30°C. This low leakage supports energy-sensitive applications such as battery-powered medical instruments and always-on industrial sensors where standby current must remain below microampere thresholds.

Does the 1PMT5935B meet any ESD immunity standards?

Yes, the 1PMT5935B is rated for >16 kV per Human Body Model (HBM) ESD immunity. This high level of electrostatic discharge robustness is achieved through internal process design and packaging, making the 1PMT5935B suitable for use in environments with frequent handling or unshielded I/O interfaces without requiring additional external ESD protection components.