Microchip Technology 1PMT5928/TR13

Overview

1PMT5928B from Microsemi is a 13 V, 3.0 W surface-mount Zener diode in the Powermite® package (DO-216), featuring 7.0 Ω dynamic impedance at 28.8 mA test current, 0.25 µA max reverse leakage at 10.4 V, and thermal resistance of 30°C/W junction-to-tab. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback paths.

For engineers reviewing the 1PMT5928B datasheet, 1PMT5928B pinout, 1PMT5928B application, or 1PMT5928B equivalent, key selection criteria include zener voltage tolerance (±5% standard), low knee impedance (550 Ω at 0.25 mA), ESD robustness (>16 kV HBM), and thermal performance enabled by the metallic tab heat sink.

Technical Context

This Zener diode operates with a nominal breakdown voltage of 13.0 V at 28.8 mA, with tight regulation maintained via low dynamic impedance (7.0 Ω) and controlled knee characteristics (550 Ω at 0.25 mA). Its DO-216 package integrates a full metallic bottom and locking tab for mechanical stability and thermal conduction.

The device supports operation from −55°C to +150°C junction temperature, dissipates up to 3.0 W when tab temperature is held at 60°C, and exhibits forward voltage of 1.2 V at 200 mA - confirming silicon PN-junction construction and suitability for bidirectional clamping or polarity-aware reference use.

Key Specifications

Pinout & Package

Package: DO-216 (Powermite®), molded surface-mount with full metallic bottom and integral locking tab acting as cathode terminal and thermal path. Cathode designated by TAB 1; mounting orientation unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5243B and PLZ13B, the 1PMT5928B delivers 6× higher power handling and 30°C/W thermal resistance - making it uniquely suitable for industrial power rail clamping where sustained energy dissipation and thermal reliability are required.

Availability

1PMT5928B is available at Aetrix Electronics and suitable for DC power rail protection, voltage reference for LDOs, overvoltage detection circuits, and microcontroller I/O protection requiring stable component supply and long-term manufacturability.

Supply support for 1PMT5928B 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 for high-power-density, thermally robust voltage regulation and transient suppression in harsh-environment power systems where traditional SMT Zeners fail under sustained stress.

FAQ

What is the zener voltage tolerance for 1PMT5928B?

The 1PMT5928B has a standard zener voltage tolerance of ±5% at 13.0 V. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. Voltage is measured at 28.8 mA test current with tab temperature held at 30°C for 20 seconds prior to reading. This tolerance directly impacts accuracy in reference and regulation applications using the 1PMT5928B.

Can 1PMT5928B be used in place of through-hole 1N5243B?

No - the 1PMT5928B is not a drop-in replacement for the 1N5243B due to fundamental differences in package, thermal design, and power rating. While both are 13 V Zeners, the 1N5243B is a 500 mW axial-leaded device with no integrated heat sink, whereas the 1PMT5928B is a 3.0 W surface-mount device relying on TAB 1 thermal conduction. Substituting requires PCB redesign and thermal validation. The 1PMT5928B is intended for new high-density, high-power SMT designs - not legacy through-hole upgrades.

What is the maximum continuous power dissipation for 1PMT5928B?

The 1PMT5928B is rated for 3.0 W DC power dissipation when the tab (TAB 1) temperature is maintained at 60°C. This assumes adequate PCB copper area (≥1 cm²) and still-air conditions. Derating is required above 60°C tab temperature - e.g., at 100°C tab, max power drops to ~1.8 W. Exceeding this limit risks thermal runaway and permanent failure. Thermal design using the 30°C/W junction-to-tab resistance is essential for reliable operation of the 1PMT5928B.

Does 1PMT5928B support automatic insertion equipment?

Yes - the 1PMT5928B is explicitly designed for compatibility with automated SMT placement equipment. Its Powermite® package features a flat, symmetric profile, defined tape-and-reel packaging per EIA-481 standard (7″ reel: 3,000 pcs; 13″ reel: 12,000 pcs), and a locking tab that prevents rotation during pick-and-place. The full metallic bottom also eliminates solder flux entrapment during reflow, improving first-pass yield. These features make the 1PMT5928B suitable for high-volume manufacturing environments.

What is the forward voltage of 1PMT5928B and how is it relevant?

The forward voltage of the 1PMT5928B is 1.2 V at 200 mA, confirming its standard silicon PN-junction construction. This parameter matters in bidirectional protection configurations (e.g., I/O clamping between V_CC and GND), where forward conduction limits positive excursions, and in series-connected reference circuits where forward drop affects bias point. It also validates device authenticity - counterfeit parts often exhibit anomalous forward characteristics. Engineers should verify this value during incoming inspection of the 1PMT5928B.