Microchip Technology 1PMT5954C/TR7

Overview

1PMT5954C/TR7 from Microsemi is a 160 V, ±1% tolerance Zener diode in Powermite® surface-mount package delivering 3.0 W power dissipation with thermal resistance of 30°C/W junction-to-tab, used for precision voltage regulation and overvoltage protection in industrial power supplies and DC-DC converters.

For engineers reviewing the 1PMT5954C/TR7 datasheet, 1PMT5954C/TR7 pinout, 1PMT5954C/TR7 application, or 1PMT5954C/TR7 equivalent, key selection criteria include zener voltage tolerance (±1%), dynamic impedance (700 Ω at 2.3 mA), reverse leakage (<6500 µA at 121.6 V), ESD rating (>16 kV HBM), and thermal performance under high-power SMT mounting.

Technical Context

This device operates as a single-element, silicon planar Zener diode with cathode designated by TAB 1. It is rated for continuous DC power dissipation of 3.0 W when tab temperature is held at 60°C, and features full metallic bottom construction to prevent solder flux entrapment during reflow assembly.

The 1PMT5954C/TR7 exhibits tight voltage regulation across its operating current range (IZK = 0.25 mA, IZT = 2.3 mA, IZM = 121.6 mA), with knee impedance of 700 Ω and low reverse leakage - critical for stable reference and clamping in high-reliability analog and power management circuits.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral heat sink locking tab; cathode identified by TAB 1; weight ≈ 0.016 g; DO-216 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1PMT5954C/TR7, the 1N5379B offers higher power but lacks SMT compatibility and thermal efficiency, while BZX85C160 sacrifices both power capability and thermal performance - making 1PMT5954C/TR7 optimal for space-constrained, high-reliability 3 W Zener regulation.

Availability

1PMT5954C/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC converters, telecom line card protection, and renewable energy inverter reference circuits requiring stable component supply with guaranteed long-term availability.

Supply support for 1PMT5954C/TR7 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 for high-power-density surface-mount voltage regulation and transient suppression in mission-critical power systems where thermal performance and long-term stability are essential.

FAQ

What is the zener voltage tolerance for 1PMT5954C/TR7?

The 1PMT5954C/TR7 has a zener voltage tolerance of ±1%, indicated by the "C" suffix in the part number. This tighter tolerance is achieved via post-package screening and enables precision voltage reference applications without external calibration. The nominal zener voltage is 160 V, measured at 2.3 mA test current with tab temperature at 30°C. Standard versions (e.g., 1PMT5954B) offer ±5% tolerance.

How is thermal management handled in the 1PMT5954C/TR7 package?

The 1PMT5954C/TR7 uses its metallic TAB 1 as the primary thermal conduction path, with a specified junction-to-tab thermal resistance of 30°C/W. Effective thermal management requires anchoring TAB 1 to a minimum 100 mm² copper pour with ≥4 thermal vias. Unlike conventional SMD diodes, the Powermite® package's full metallic bottom and locking tab ensure consistent thermal contact and mechanical stability during reflow and thermal cycling.

What does the "/TR7" suffix indicate in 1PMT5954C/TR7?

The "/TR7" suffix denotes tape-and-reel packaging per EIA-481 standard on a 7-inch reel containing 3,000 units. This format is optimized for automated SMT placement equipment and ensures consistent orientation (cathode TAB 1 facing defined direction) and moisture-sensitive level (MSL) compliance. The "TR7" does not affect electrical specifications - all performance parameters remain identical to the bulk version.

Can 1PMT5954C/TR7 be used in place of 1PMT5954B?

Yes, the 1PMT5954C/TR7 is a direct functional replacement for 1PMT5954B with identical package, pinout, and power rating - the only difference is the tighter ±1% zener voltage tolerance (vs. ±5% for the "B" version). No PCB layout changes are required. System-level validation should confirm that the improved tolerance delivers measurable benefit in reference accuracy or clamping consistency for the target application.

What is the maximum reverse leakage current for 1PMT5954C/TR7 at rated voltage?

The maximum reverse leakage current for 1PMT5954C/TR7 is 6500 µA at 121.6 V (VR = 0.76 × VZ), as specified in the Electrical Characteristics table. This value is measured at TL = 30°C and reflects worst-case leakage under near-clamping conditions. At lower reverse voltages (e.g., 100 V), leakage drops significantly - typically below 100 µA - supporting low-quiescent-current designs.