Microchip Technology 1PMT5937A/TR13

Overview

1PMT5937A/TR13 from Microsemi is a 33 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 11.4 mA test current (IZT), 33 Ω dynamic impedance (ZZT), and 1 µA max reverse leakage at 25.1 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and ESD-protected signal lines.

For engineers reviewing the 1PMT5937A/TR13 datasheet, 1PMT5937A/TR13 pinout, 1PMT5937A/TR13 application, or 1PMT5937A/TR13 equivalent, key selection considerations include its 33 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, >16 kV HBM ESD rating, and compatibility with automated SMT placement equipment.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its Powermite® package features a full metallic bottom (TAB 1) acting as both cathode terminal and primary heat path, with thermal resistance of 30°C/W junction-to-tab.

Designed for surface-mount assembly, it eliminates solder flux entrapment and supports automatic insertion. Electrical behavior is defined at TL = 30°C with IZT = 11.4 mA; voltage regulation is specified with ±5% tolerance, and knee current (IZK) is 0.25 mA at ZZK = 800 Ω.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216AA), molded surface-mount case with full metallic bottom (TAB 1) serving as cathode and thermal interface. Mounting orientation is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ33A and BZX84-C33, the 1PMT5937A/TR13 uniquely combines 33 V precision regulation, 3.0 W continuous power handling, and DO-216 mechanical robustness-making it optimal for industrial power rails requiring both accuracy and ruggedness.

Availability

1PMT5937A/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, ESD-hardened communication interfaces, and sensor signal conditioning requiring stable component supply and long-lifecycle support.

Supply support for 1PMT5937A/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-tolerant components for aerospace, defense, and industrial markets.

The Powermite® Zener diode product line delivers high-power surface-mount voltage regulation in compact packages, targeting applications demanding thermal performance, ESD resilience, and automated manufacturability.

FAQ

What is the Zener voltage tolerance for 1PMT5937A/TR13?

The 1PMT5937A/TR13 has a standard Zener voltage tolerance of ±5% at 33 V, measured at IZT = 11.4 mA and TAB 1 temperature of 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D, but the /TR13 variant uses the standard ±5% grade. This tolerance directly impacts regulation accuracy in feedback loops and reference circuits using the 1PMT5937A/TR13.

How is thermal management handled in the 1PMT5937A/TR13 package?

The 1PMT5937A/TR13 uses the Powermite® package with a full metallic bottom (TAB 1) that serves as both cathode terminal and primary thermal path. Its junction-to-TAB thermal resistance is 30°C/W, enabling efficient heat transfer to the PCB copper. For reliable 3.0 W operation, the TAB 1 must be soldered to a thermally adequate copper area, as specified in Microsemi's mounting pad dimensions for DO-216.

Is the 1PMT5937A/TR13 compatible with lead-free reflow processes?

Yes, the 1PMT5937A/TR13 is qualified for standard lead-free reflow profiles, including JEDEC J-STD-020-compliant peak temperatures up to 260°C. Its molded Powermite® package and metallic terminals are designed to withstand multiple thermal cycles without delamination or solder joint integrity loss, supporting automated SMT assembly used in high-volume production of equipment relying on the 1PMT5937A/TR13.

What does the "TR13" suffix indicate in 1PMT5937A/TR13?

The "TR13" suffix denotes tape-and-reel packaging per EIA Standard 481 on a 13-inch reel containing 12,000 units. This format is optimized for high-speed pick-and-place machines and ensures consistent feeding and placement accuracy. The "A" in 1PMT5937A indicates the base version with ±5% Zener tolerance, distinguishing it from tighter-tolerance variants like 1PMT5937C (±2%) or 1PMT5937D (±1%).

Can the 1PMT5937A/TR13 be used in bidirectional ESD protection configurations?

No - the 1PMT5937A/TR13 is a unidirectional Zener diode, configured with cathode on TAB 1 and anode on Lead 2. It conducts only in reverse breakdown (cathode positive relative to anode). For bidirectional ESD protection, two 1PMT5937A/TR13 devices would need to be connected anode-to-anode or cathode-to-cathode, but this is not recommended due to mismatched parameters; purpose-built bidirectional TVS arrays are preferred instead.