Microchip Technology 1PMT5929/TR7

Overview

1PMT5929B from Microsemi is a 15 V, 3.0 W surface-mount Zener diode in the Powermite® package, featuring 9.0 Ω dynamic impedance at 25 mA test current, 600 µA max reverse leakage at 11.4 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 1PMT5929B datasheet, 1PMT5929B pinout, 1PMT5929B application, or 1PMT5929B equivalent, key selection criteria include zener voltage tolerance (±5%), ESD rating (>16 kV HBM), junction temperature range (–55°C to +150°C), and tape-and-reel packaging per EIA-481 for automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its Powermite® package integrates a full metallic bottom and locking tab that functions as both mechanical anchor and thermal path to PCB copper, enabling efficient heat dissipation without flux entrapment.

The device exhibits low knee impedance (≤600 Ω) and stable zener voltage under transient load conditions, with reverse leakage held to ≤600 µA at 11.4 V - supporting reliable clamping in low-power protection circuits where leakage-sensitive biasing is required.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral locking tab; cathode designated by TAB 1; mounting position unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF15A and BZX84-C15, the 1PMT5929B uniquely combines 3.0 W continuous power, 30°C/W thermal resistance, and metallic-tab thermal anchoring - making it the only option among the three qualified for sustained 15 V regulation in thermally demanding industrial power supplies.

Availability

1PMT5929B is available at Aetrix Electronics and suitable for DC power rail clamping, regulator feedback reference, and industrial sensor biasing requiring stable component supply and long-term lifecycle support.

Supply support for 1PMT5929B 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 manufacturer specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The Powermite® Zener series, including 1PMT5929B, was designed for high-power-density voltage regulation in space-constrained, thermally demanding applications such as power supply monitoring and precision reference circuits.

FAQ

What is the zener voltage tolerance for 1PMT5929B?

The standard 1PMT5929B has a zener voltage tolerance of ±5% at 25 mA test current. Tighter tolerances are available: ±2% with suffix C (1PMT5929C) and ±1% with suffix D (1PMT5929D). All variants maintain identical thermal and packaging characteristics. The 1PMT5929B datasheet specifies V_Z = 15 V nominal, measured at T_C = 30°C with 20-second stabilization after current application.

How is thermal management handled in the 1PMT5929B package?

The 1PMT5929B uses the Powermite® package with a full metallic bottom and integral locking tab that serves as both mechanical anchor and primary thermal path to the PCB. Its junction-to-tab thermal resistance is 30°C/W, meaning 1°C rise per 33.3 mW dissipated when TAB1 is held at 60°C. Effective thermal design requires soldering TAB1 to a minimum 100 mm² copper pour with ≥2 thermal vias.

Can 1PMT5929B be used in place of through-hole zener diodes like 1N5245B?

No - the 1PMT5929B is not a direct replacement for 1N5245B due to fundamental differences: 1N5245B is a 15 V, 500 mW through-hole device in DO-35 package with no thermal tab, while 1PMT5929B delivers 3.0 W in a surface-mount Powermite® package with metallic thermal interface. Substitution requires PCB redesign, thermal analysis, and validation of voltage regulation stability under load.

What is the maximum reverse leakage current for 1PMT5929B?

The maximum reverse leakage current for 1PMT5929B is 600 µA at V_R = 11.4 V (76% of nominal V_Z). This value is guaranteed across the full operating temperature range (–55°C to +150°C) and is critical for applications requiring low quiescent current, such as battery-powered sensor biasing or high-impedance feedback networks where leakage-induced offset must be minimized.

Is 1PMT5929B compatible with lead-free reflow profiles?

Yes - the 1PMT5929B Powermite® package is qualified for standard lead-free reflow profiles (J-STD-020), including peak temperatures up to 260°C for 30 seconds. Its molded construction and metallic bottom ensure mechanical stability and void-free solder joints. The device's junction temperature rating (–55°C to +150°C) remains valid post-reflow, provided thermal design guidelines for TAB1 copper area are followed.