Microchip Technology 1PMT5954/TR7

Overview

1PMT5954/TR7 from Microsemi is a 160 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 700 Ω dynamic impedance at 2.3 mA test current and 121.6 mA maximum Zener current - used for precision voltage regulation and overvoltage protection in high-reliability DC power rails.

For engineers reviewing the 1PMT5954/TR7 datasheet, 1PMT5954/TR7 pinout, 1PMT5954/TR7 application, or 1PMT5954/TR7 equivalent, key selection considerations include its 160 V nominal Zener voltage, 3.0 W thermal capability with metallic-tab heat sinking, DO-216 mechanical outline, and ESD rating >16 kV HBM - critical for industrial power supply clamping and automotive subsystems requiring stable reverse-biased breakdown behavior.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified current range (IZK = 0.25 mA to IZM = 121.6 mA). Its Powermite® package integrates a full metallic bottom and locking tab that directly conducts heat from the junction to the PCB pad, enabling 30°C/W thermal resistance from junction to TAB 1.

The device exhibits low reverse leakage (IR ≤ 1 µA at VR = 121.6 V), supports automatic insertion equipment due to standardized tape-and-reel packaging (EIA-481, 3,000 pcs/7″ reel), and maintains stable Zener voltage over -55°C to +150°C junction temperature range - suitable for thermally constrained embedded power management circuits.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216) surface-mount molded case 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 1N5954B and BZX85C160, the 1PMT5954/TR7 delivers superior thermal performance (3.0 W vs. ≤1.3 W), SMT compatibility, and ESD resilience - making it the preferred choice for space-constrained, high-reliability power rail protection where junction-to-PCB thermal path and assembly yield are design priorities.

Availability

1PMT5954/TR7 is available at Aetrix Electronics and suitable for industrial power supply clamping, automotive ECU voltage reference, and telecom line surge protection requiring stable component supply and consistent Zener voltage tolerance.

Supply support for 1PMT5954/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 specifically for surface-mount power regulation and transient suppression in thermally demanding, high-volume manufacturing environments - emphasizing mechanical robustness, automated assembly readiness, and repeatable electrical performance.

FAQ

What is the Zener voltage tolerance of the 1PMT5954/TR7?

The 1PMT5954/TR7 has a standard Zener voltage tolerance of ±5% at 160 V, measured at 2.3 mA test current with TAB 1 held at 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D respectively, but the /TR7 variant uses the standard ±5% grade. This tolerance directly impacts voltage-clamping accuracy in overvoltage protection circuits.

How is thermal management handled in the 1PMT5954/TR7 package?

The 1PMT5954/TR7 uses Microsemi's Powermite® package with a full metallic bottom and integral locking tab that serves as the primary thermal path from junction to PCB. Its specified thermal resistance is 30°C/W junction-to-TAB 1, meaning effective cooling requires soldering TAB 1 to a minimum 100 mm² copper pour. This design eliminates reliance on lead-frame conduction, unlike conventional SOD-123 or DO-214 packages.

Is the 1PMT5954/TR7 compatible with automated SMT assembly processes?

Yes, the 1PMT5954/TR7 is fully compatible with automated surface-mount assembly. It ships in EIA-481 compliant tape-and-reel format (7″ reel, 3,000 pieces), features standardized pad dimensions per DO-216 outline, and its locking tab geometry prevents rotation during pick-and-place. The full metallic bottom also avoids flux entrapment during reflow, increasing first-pass yield in high-volume production.

What is the maximum reverse leakage current for the 1PMT5954/TR7?

The maximum reverse leakage current (IR) for the 1PMT5954/TR7 is 1 µA at a reverse voltage (VR) of 121.6 V, measured at TL = 30°C. This low leakage ensures minimal power loss in high-impedance bias networks and preserves accuracy in precision reference applications - especially important in battery-powered or energy-harvesting systems where standby current must be strictly controlled.

Does the 1PMT5954/TR7 have ESD protection built-in?

Yes, the 1PMT5954/TR7 is rated for >16 kV per Human Body Model (HBM) ESD, verified per ANSI/ESDA/JEDEC JS-001. This high ESD rating is intrinsic to the Powermite® construction and ensures robustness during automated handling, PCB assembly, and field operation - eliminating the need for external ESD protection in many industrial and automotive applications where electrostatic discharge is a known risk factor.