Microchip Technology 1PMT5925/TR13

Overview

1PMT5925B from Microsemi is a 10 V, 3.0 W surface-mount Zener diode in the Powermite® package, featuring 37.5 mA test current, 4.5 Ω dynamic impedance at IZT, 0.25 µA max reverse leakage at 5 V, and thermal resistance of 30°C/W junction-to-tab. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and transient protection circuits.

For engineers reviewing the 1PMT5925B datasheet, 1PMT5925B pinout, 1PMT5925B application, or 1PMT5925B equivalent, key selection criteria include zener voltage tolerance (±5% standard), low knee impedance (500 Ω at 0.25 mA), ESD rating (>16 kV HBM), full metallic bottom for flux-free assembly, and compatibility with automated insertion equipment.

Technical Context

This Zener diode operates with a nominal zener voltage of 10 V at 37.5 mA test current (IZT), exhibits 4.5 Ω dynamic impedance (ZZT) under that condition, and maintains tight regulation down to 0.25 mA knee current (IZK) with 500 Ω knee impedance (ZZK). Its 30°C/W thermal resistance enables stable operation at tab temperatures up to +150°C.

The device uses a DO-216 molded surface-mount package with cathode designated by Tab 1, full metallic bottom to prevent solder flux entrapment, and integral locking tabs acting as heat sinks. It is rated for 3.0 W DC power dissipation when Tab 1 is held at 60°C and supports tape-and-reel packaging per EIA-481 (7" reel: 3,000 pcs).

Key Specifications

Pinout & Package

The 1PMT5925B uses the Powermite® surface-mount package (DO-216 outline), featuring a molded body with full metallic bottom and integral heat-sink locking tabs. Cathode is unambiguously designated by Tab 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5240B and PLZ10B, the 1PMT5925B delivers 12× higher power capability and superior thermal performance via its full-metallic tab, making it uniquely suited for industrial power regulation where sustained 3.0 W clamping and 150°C operation are required.

Availability

1PMT5925B is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and industrial sensor biasing requiring stable component supply, consistent parametric performance, and long-lifecycle availability.

Supply support for 1PMT5925B 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 family-including the 1PMT5925B-was engineered to deliver through-hole–level power handling in surface-mount form, targeting space-constrained yet thermally demanding applications such as telecom power systems and motor drive protection.

FAQ

What is the zener voltage tolerance of the 1PMT5925B?

The 1PMT5925B has a standard zener voltage tolerance of ±5% at 10 V nominal, measured at 37.5 mA test current and tab temperature of 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. This tolerance directly impacts regulation accuracy in feedback loops and reference circuits where 1PMT5925B is deployed.

How is thermal management handled in the 1PMT5925B package?

The 1PMT5925B uses a Powermite® package with a full metallic bottom and integral locking tabs that serve as both mechanical anchors and primary heat-sink paths. Its specified thermal resistance is 30°C/W junction-to-Tab 1, enabling effective heat transfer to PCB copper when Tab 1 is soldered to an adequate thermal pad. This design allows 1PMT5925B to safely dissipate its full 3.0 W rating under controlled tab temperature conditions.

Can the 1PMT5925B be used in automotive applications?

Yes, the 1PMT5925B is qualified for operation from –55°C to +150°C junction and storage temperature, meeting extended temperature requirements common in under-hood automotive subsystems. Its >16 kV HBM ESD rating and robust DO-216 construction support reliability in noisy, vibration-prone environments. However, system-level qualification per AEC-Q101 is not documented for 1PMT5925B, so validation per end-application stress conditions remains the designer's responsibility.

What does the "B" suffix in 1PMT5925B indicate?

The "B" suffix in 1PMT5925B denotes compliance with Microsemi's standard product revision and testing protocol, including electrical screening at TL = 30°C and adherence to the Powermite® mechanical specifications outlined in MSC0995.PDF. It distinguishes this version from earlier revisions and confirms alignment with the published maximum ratings, zener voltage distribution, and packaging standards referenced in the official datasheet.

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

Yes, the 1PMT5925B is compatible with standard lead-free reflow profiles, including peak temperatures up to 260°C, as supported by its DO-216 molded package construction and metallization system. The full metallic bottom enhances thermal uniformity during reflow, and the device's 150°C maximum storage temperature ensures survivability through multiple thermal cycles. Always refer to the latest Microchip packaging reliability report for 1PMT5925B-specific process validation data.