Microchip Technology 1PMT5956B/TR7

Overview

1PMT5956B from Microsemi is a 200 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 1.9 mA test current (IZT), 1200 Ω dynamic impedance (ZZT), and 11.6 mA maximum Zener current (IZM). It serves as a precision voltage reference or overvoltage clamp in high-reliability power supply regulation circuits.

For engineers reviewing the 1PMT5956B datasheet, 1PMT5956B pinout, 1PMT5956B application, or 1PMT5956B equivalent, key selection criteria include its 200 V nominal Zener voltage, 3.0 W thermal capability with metallic-tab heat sinking, low reverse leakage (<1 µA at VR = 152 V), ESD rating >16 kV HBM, and DO-216 mechanical outline compatibility with automated SMT assembly.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified current range. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction from junction to PCB pad, enabling stable 3.0 W operation without external heatsinking under defined thermal conditions.

The device exhibits low knee impedance (ZZK = 0.25 Ω) and low reverse leakage (IR ≤ 1 µA at VR = 152 V), supporting precise clamping in transient suppression and reference applications. Voltage tolerance is ±5% standard, with optional 2% (suffix C) and 1% (suffix D) variants available.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral locking tab acting as thermal interface. 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 SMCJ200A and BZX84-C200, the 1PMT5956B uniquely delivers 3.0 W continuous Zener regulation in a thermally optimized SMT package-enabling high-stability voltage references and clamps where sustained power dissipation and thermal reliability are critical.

Availability

1PMT5956B is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU protection, telecom line card surge suppression, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for 1PMT5956B 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 engineered for high-power-density, thermally robust voltage regulation in mission-critical power systems where traditional through-hole or low-power SMT devices fail under sustained load.

FAQ

What is the maximum continuous power dissipation of the 1PMT5956B?

The 1PMT5956B is rated for 3.0 W DC power dissipation when the TAB 1 temperature is maintained at 60°C. This rating assumes proper PCB copper area for thermal conduction. Exceeding this condition risks thermal runaway or parametric shift. Derating is required above 60°C TAB temperature per the device's 30°C/W junction-to-TAB thermal resistance.

How is cathode identification implemented on the 1PMT5956B package?

The cathode of the 1PMT5956B is designated by TAB 1-the large metallic tab on the package underside. This is confirmed in the MSC0995.PDF mechanical specifications and is consistent across the 1PMT5913B–1PMT5956B series. Correct orientation is essential for proper reverse-bias operation and thermal performance.

Does the 1PMT5956B meet industry-standard ESD requirements?

Yes, the 1PMT5956B has an ESD rating exceeding 16 kV per the Human Body Model (HBM), as stated in the MSC0995.PDF features table. This qualifies it for standard electronics assembly environments without additional ESD handling precautions beyond typical industry practice.

Can the 1PMT5956B be used as a direct replacement for older through-hole 1N5956B Zeners?

No-while both share the same 200 V Zener voltage rating, the 1PMT5956B uses a DO-216AA surface-mount Powermite® package with TAB 1 cathode and thermal design intent, whereas the 1N5956B is axial-lead DO-41. PCB layout, thermal management, and assembly process differ fundamentally; they are functionally equivalent but not mechanically interchangeable.

What is the reverse leakage current specification for the 1PMT5956B at rated voltage?

At VR = 152 V (76% of nominal 200 V), the 1PMT5956B guarantees IR ≤ 1 µA maximum, per the Electrical Characteristics table in MSC0995.PDF. This low leakage supports high-impedance bias networks and minimizes standby power loss in precision analog circuits.