Microchip Technology 1PMT5925B/TR7

Overview

1PMT5925B/TR7 from Microsemi is a 10 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 4.5 Ω dynamic impedance at 37.5 mA test current and 500 µA max reverse leakage at 5 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial control modules.

For engineers reviewing the 1PMT5925B/TR7 datasheet, 1PMT5925B/TR7 pinout, 1PMT5925B/TR7 application, or 1PMT5925B/TR7 equivalent, key selection criteria include its 10 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, ESD rating >16 kV HBM, and compatibility with automated SMT insertion equipment.

Technical Context

This Zener diode operates in reverse breakdown mode to regulate or clamp voltage with tight voltage tolerance and low dynamic impedance. Its Powermite® package integrates a full metallic bottom (TAB 1) for flux-free soldering and a locking tab that functions as both mechanical anchor and thermal path.

The device exhibits 500 µA maximum reverse leakage at VR = 5 V and maintains stable regulation across -55°C to +150°C junction temperature range. Thermal resistance from junction to TAB 1 is 30°C/W, enabling effective heat transfer when mounted on copper pads.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216), molded surface-mount package with full metallic bottom (TAB 1) acting as cathode terminal and primary thermal interface. Dimensions comply with EIA-481 tape-and-reel standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF10A and BZX84-C10, the 1PMT5925B/TR7 delivers triple the power handling and half the dynamic impedance in a thermally optimized package-critical for industrial and automotive applications demanding sustained regulation under thermal stress.

Availability

1PMT5925B/TR7 is available at Aetrix Electronics and suitable for industrial power monitoring, automotive body control modules, medical sensor signal conditioning, and telecom line card bias supply requiring stable component supply and long-term lifecycle continuity.

Supply support for 1PMT5925B/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 semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The Powermite® Zener series-including the 1PMT5925B/TR7-is engineered for ruggedized surface-mount voltage regulation where thermal performance, ESD robustness, and automated assembly compatibility are critical.

FAQ

What is the Zener voltage tolerance of the 1PMT5925B/TR7?

The 1PMT5925B/TR7 has a standard Zener voltage tolerance of ±5% at 10 V nominal, measured at 37.5 mA test current with TAB 1 held at 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D, but the base 1PMT5925B/TR7 uses ±5%. This tolerance directly impacts accuracy in voltage reference and clamping applications.

How is thermal management handled in the 1PMT5925B/TR7 package?

The 1PMT5925B/TR7 uses the Powermite® package with TAB 1 as a full metallic bottom serving as both cathode and thermal interface. Its 30°C/W junction-to-TAB thermal resistance requires mounting on ≥100 mm² of 2 oz copper to achieve the rated 3.0 W dissipation at TAB 1 = 60°C. No external heatsink is needed if PCB layout meets this requirement.

Is the 1PMT5925B/TR7 compatible with lead-free reflow processes?

Yes, the 1PMT5925B/TR7 is qualified for standard lead-free reflow profiles, including JEDEC J-STD-020D peak temperatures up to 260°C. The molded Powermite® package and metallic TAB construction withstand thermal cycling without delamination or parameter shift, and the full metallic bottom prevents flux entrapment during soldering.

What does the "TR7" suffix indicate in 1PMT5925B/TR7?

The "TR7" suffix denotes tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format ensures compatibility with high-speed pick-and-place equipment and supports automated SMT assembly. The TR7 variant retains identical electrical and thermal specifications as the base 1PMT5925B device.

Can the 1PMT5925B/TR7 be used in place of through-hole Zener diodes like the 1N4740A?

The 1PMT5925B/TR7 is not a direct drop-in replacement for the 1N4740A due to different packages (DO-216 vs. DO-41) and thermal paths. While both are 10 V Zeners, the 1PMT5925B/TR7 relies on TAB 1 conduction, whereas the 1N4740A uses lead-frame convection. PCB layout and thermal design must be revised to leverage the 1PMT5925B/TR7's 3.0 W capability.