Microchip Technology 1PMT5954AE3/TR13

Overview

1PMT5954AE3/TR13 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 1PMT5954AE3/TR13 datasheet, 1PMT5954AE3/TR13 pinout, 1PMT5954AE3/TR13 application, or 1PMT5954AE3/TR13 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low reverse leakage (<1 µA at 121.6 V), and compatibility with automated SMT assembly per EIA-481 tape-and-reel packaging.

Technical Context

This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1, requiring no external biasing circuitry. Its full metallic bottom and integral heat-sink locking tab enable direct thermal conduction to the PCB pad, supporting stable regulation under sustained 3.0 W power dissipation when mounted on adequate copper area.

The device exhibits tight knee characteristics (IZK = 0.25 mA, ZZK = 6500 Ω) and low reverse leakage (IR ≤ 1 µA at VR = 121.6 V), making it suitable for low-current reference and clamping applications where stability across -55°C to +150°C junction temperature is required.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral heat-sink locking tab; cathode identified by TAB 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5954B and SMBJ160A, the 1PMT5954AE3/TR13 uniquely combines SMT compatibility, 3.0 W DC power handling, 700 Ω dynamic impedance, and <1 µA reverse leakage - making it the only option among the three qualified for precision shunt regulation in thermally constrained environments.

Availability

1PMT5954AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, telecom line card protection, and test equipment requiring stable component supply with guaranteed long-term continuity.

Supply support for 1PMT5954AE3/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 to deliver high-power surface-mount voltage regulation in compact, thermally efficient packages - specifically addressing space-constrained, high-stability power rail needs in mission-critical systems.

FAQ

What is the Zener voltage tolerance for 1PMT5954AE3/TR13?

The 1PMT5954AE3/TR13 has a standard Zener voltage tolerance of ±5% at 160 V, measured at IZT = 2.3 mA with TAB 1 held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D respectively, but the E3 suffix denotes the standard ±5% version. This tolerance directly impacts regulation accuracy in feedback and reference circuits using the 1PMT5954AE3/TR13.

How is thermal management handled for 1PMT5954AE3/TR13 in PCB layout?

The 1PMT5954AE3/TR13 relies on TAB 1 as its primary thermal interface, with a specified junction-to-TAB thermal resistance of 30°C/W. To achieve rated 3.0 W dissipation, the TAB must be soldered to a minimum 100 mm² copper pad with ≥2 thermal vias to inner ground planes. The full metallic bottom and locking tab of the Powermite® package ensure low-impedance conduction - critical for maintaining junction temperature below +150°C in the 1PMT5954AE3/TR13.

Is 1PMT5954AE3/TR13 compatible with lead-free reflow processes?

Yes, the 1PMT5954AE3/TR13 is qualified for lead-free reflow per J-STD-020, with a maximum peak temperature of 260°C. Its molded Powermite® package and metallization system withstand standard SAC305 profiles. The device is supplied in EIA-481-compliant tape-and-reel (TR13 = 13-inch reel, 12,000 pieces), and the full metallic bottom prevents flux entrapment - a known reliability risk in lead-free reflow that the 1PMT5954AE3/TR13 inherently avoids.

What is the reverse leakage current specification for 1PMT5954AE3/TR13?

The 1PMT5954AE3/TR13 specifies maximum reverse leakage current IR ≤ 1 µA at VR = 121.6 V (80% of VZ), measured at TL = 30°C. This low leakage enables use in high-impedance sensing and reference circuits where parasitic current would otherwise degrade accuracy. At elevated temperatures or voltages approaching VZ, leakage increases predictably - data sheets provide derating curves confirming <10 µA at 150°C junction for the 1PMT5954AE3/TR13.

Does 1PMT5954AE3/TR13 have a defined cathode marking?

Yes, the cathode of the 1PMT5954AE3/TR13 is unambiguously designated by TAB 1, as confirmed in the mechanical specifications section of the MSC0995 datasheet. No band, stripe, or ink marking is used - instead, physical orientation and tab position define polarity. During PCB layout, TAB 1 must be routed to the more positive node in shunt regulator configurations, and this mechanical polarity identification is critical for correct function of the 1PMT5954AE3/TR13.