Microchip Technology 1PMT5933/TR7

Overview

1PMT5933B from Microsemi is a 22 V, 3.0 W surface-mount Zener diode in the Powermite® package (DO-216), featuring 17.5 Ω dynamic impedance at 17 mA test current, 1 µA max reverse leakage at 16.7 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 1PMT5933B datasheet, 1PMT5933B pinout, 1PMT5933B application, or 1PMT5933B equivalent, key selection criteria include its 22 V nominal Zener voltage with ±5% tolerance, 3.0 W DC power dissipation at TAB1 = 60°C, low knee impedance (650 Ω at 0.25 mA), ESD rating >16 kV HBM, and compatibility with automated SMT assembly.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its DO-216 package integrates a full metallic bottom and locking tab for mechanical stability and thermal conduction to PCB copper.

The device exhibits low reverse leakage (≤1 µA at VR = 16.7 V) and stable dynamic impedance (17.5 Ω at IZT = 17 mA), enabling reliable performance in low-power reference and clamping applications where thermal management and ESD robustness are critical.

Key Specifications

Pinout & Package

Package: DO-216 (Powermite® surface-mount molded package); cathode designated by TAB 1; full metallic bottom; locking tab acts as integral heat sink; weight ≈ 0.016 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1PMT5933B, the 1N5355B offers greater power headroom but lacks the DO-216's thermal conduction advantage, while the SZ1SMA5922-TP trades power and thermal performance for lower cost and broader availability in high-volume commodity applications.

Availability

1PMT5933B is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, ESD safeguarding, and low-power voltage reference applications requiring stable component supply and consistent parametric performance.

Supply support for 1PMT5933B 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 surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding environments.

FAQ

What is the Zener voltage tolerance for 1PMT5933B?

The 1PMT5933B has a standard Zener voltage tolerance of ±5% at 22 V, measured at IZT = 17 mA and TAB1 temperature of 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. Voltage measurement must be performed within 20 seconds of applying DC test current to avoid thermal drift effects.

How is thermal management implemented in the 1PMT5933B package?

The 1PMT5933B uses its metallic TAB 1 as the primary thermal conduction path, with a specified junction-to-tab thermal resistance of 30°C/W. Effective thermal management requires soldering TAB 1 to a minimum 100 mm² copper pour on the PCB. The full metallic bottom prevents flux entrapment, ensuring consistent solder joint quality and long-term thermal interface reliability.

Can 1PMT5933B be used in automated SMT assembly processes?

Yes, the 1PMT5933B is fully compatible with automated surface-mount insertion and reflow processes. Its Powermite® package features a unique locking tab that stabilizes placement during pick-and-place, and the full metallic bottom eliminates solder flux entrapment-reducing voiding risk and improving first-pass yield in high-volume manufacturing.

What is the maximum reverse leakage current for 1PMT5933B?

The maximum reverse leakage current for 1PMT5933B is 1 µA at a reverse voltage of 16.7 V and ambient temperature of 30°C. This low leakage supports high-impedance reference and sensing applications where standby current must remain below microampere thresholds without compromising regulation accuracy.

Is 1PMT5933B rated for automotive or industrial temperature ranges?

Yes, the 1PMT5933B is rated for junction and storage temperatures from –55°C to +150°C, meeting industrial and extended-temperature automotive requirements. Its robust construction, including molded encapsulation and metallic thermal interface, ensures stable operation across this full range without parameter shift or reliability degradation.