Microchip Technology 1PMT5951C/TR13

Overview

1PMT5951C/TR13 from Microsemi is a 120 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 380 Ω dynamic impedance at 3.1 mA test current and thermal resistance of 30°C/W junction-to-TAB1. It serves as a precision voltage reference or overvoltage clamp in industrial power supplies and automotive control modules.

For engineers reviewing the 1PMT5951C/TR13 datasheet, 1PMT5951C/TR13 pinout, 1PMT5951C/TR13 application, or 1PMT5951C/TR13 equivalent, key selection criteria include its tight 1% voltage tolerance, ESD rating >16 kV HBM, full metallic bottom eliminating flux entrapment, and compatibility with automated insertion equipment using EIA-481 tape-and-reel packaging.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 120 V measured at I_ZT = 3.1 mA and T_L = 30°C. Its 380 Ω dynamic impedance (Z_ZT) and 4500 µA maximum reverse leakage (I_R) at V_R = 91.2 V reflect stable regulation under moderate load variation.

The Powermite® package integrates a locking tab acting as an integral heat sink and features a full metallic bottom for enhanced thermal conduction and solder reliability. Junction-to-TAB1 thermal resistance is specified at 30°C/W, enabling effective power dissipation when mounted on thermally conductive PCB pads.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral heat-sink locking tab; 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 1N5375B and BZX85C120, the 1PMT5951C/TR13 offers superior voltage stability (±1% vs ±5%), lower dynamic impedance (380 Ω vs ≥500 Ω), integrated thermal management via metallic tab, and ESD hardening - making it optimal for automated, high-reliability SMT designs demanding precision and robustness.

Availability

1PMT5951C/TR13 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive ECU reference design, and telecom surge suppression requiring stable component supply and full traceability.

Supply support for 1PMT5951C/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 specifically for surface-mount applications demanding high power density, thermal reliability, and process compatibility - addressing limitations of legacy axial and DO-41 packages in automated manufacturing.

FAQ

What is the Zener voltage tolerance for 1PMT5951C/TR13?

The 1PMT5951C/TR13 has a Zener voltage tolerance of ±1%, indicated by the "C" suffix in the part number. This tight tolerance is achieved through post-package screening and enables use in precision voltage reference and regulation circuits where standard ±5% devices would introduce unacceptable error margins. The 120 V nominal value is guaranteed within ±1.2 V across the full operating temperature range.

How is thermal management handled in the 1PMT5951C/TR13 package?

The 1PMT5951C/TR13 uses Microsemi's Powermite® package with a full metallic bottom and integral locking tab that functions as a direct thermal conduction path from the silicon junction to the PCB. Its specified junction-to-TAB1 thermal resistance is 30°C/W, allowing safe 3.0 W continuous dissipation when TAB 1 is soldered to a sufficiently sized copper pour. No external heatsink is required under typical board-level thermal conditions.

Is the 1PMT5951C/TR13 compatible with lead-free reflow processes?

Yes, the 1PMT5951C/TR13 is qualified for standard lead-free reflow profiles including JEDEC J-STD-020. Its molded Powermite® package and metallic terminations withstand peak temperatures up to 260°C for 30 seconds. The full metallic bottom also improves wetting and reduces voiding risk during reflow, supporting high-yield automated assembly in RoHS-compliant production lines.

What does the "TR13" suffix indicate in 1PMT5951C/TR13?

The "TR13" suffix denotes tape-and-reel packaging per EIA-481 standard on a 13-inch reel containing 12,000 units. This configuration is optimized for high-speed pick-and-place machines used in volume SMT manufacturing. The reel meets industry-standard dimensional and tension requirements, ensuring reliable feeding and placement without tape breakage or component misalignment.

Can the 1PMT5951C/TR13 replace older through-hole Zeners like 1N5375B in existing designs?

The 1PMT5951C/TR13 can serve as a functional upgrade to 1N5375B in many applications, offering identical 120 V nominal voltage but with ±1% tolerance, lower dynamic impedance, and superior thermal performance. However, it is not a drop-in replacement due to its DO-216AA surface-mount footprint versus DO-204AL axial leads - PCB layout revision is required to accommodate the Powermite® pad geometry and thermal pad requirements.