Microchip Technology 1PMT5933C/TR7

Overview

1PMT5933C/TR7 from Microsemi is a 22 V, ±1% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 17.5 Ω dynamic impedance at 17 mA test current and thermal resistance of 30°C/W junction-to-TAB1 - used for precision voltage regulation in space-constrained power supply rails.

For engineers reviewing the 1PMT5933C/TR7 datasheet, 1PMT5933C/TR7 pinout, 1PMT5933C/TR7 application, or 1PMT5933C/TR7 equivalent, key selection criteria include tight voltage tolerance (±1%), ESD robustness (>16 kV HBM), low reverse leakage (≤1 µA at 16.7 V), and thermal performance enabled by the full metallic bottom and integral heat sink tab.

Technical Context

This Zener diode operates as a two-terminal voltage reference device, with cathode designated by TAB 1 and anode connected to the molded body. Its Powermite® package integrates a locking tab that functions as both mechanical anchor and thermal path to PCB copper.

It delivers stable 22 V regulation under DC conditions with I_ZT = 17 mA, exhibits 17.5 Ω dynamic impedance (Z_ZT) at that current, and maintains ≤1 µA reverse leakage (I_R) up to 16.7 V - enabling use in low-power biasing and overvoltage clamping where accuracy and thermal reliability are critical.

Key Specifications

Pinout & Package

The 1PMT5933C/TR7 uses the DO-216 surface-mount package (Powermite®), featuring a full metallic bottom and integral heat sink locking tab. Cathode is designated by TAB 1; anode connects to the molded body. Mounting orientation is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF22A and BZX84-C22, the 1PMT5933C/TR7 uniquely combines ±1% tolerance, 3.0 W dissipation, and 30°C/W thermal resistance in a surface-mount package - making it suitable for high-reliability power rail regulation where accuracy, energy handling, and thermal management are jointly critical.

Availability

1PMT5933C/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, medical instrumentation, and telecom line card designs requiring stable component supply with traceable sourcing and long-lifecycle support.

Supply support for 1PMT5933C/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 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 to deliver through-hole-level power handling in surface-mount form factors - targeting applications needing robust voltage regulation without compromising board space or assembly automation.

FAQ

What is the Zener voltage tolerance for 1PMT5933C/TR7?

The "C" suffix in 1PMT5933C/TR7 denotes ±1% Zener voltage tolerance at 22 V, measured at I_ZT = 17 mA and TAB 1 temperature of 30°C. This tighter tolerance improves regulation accuracy in feedback networks and reference circuits compared to standard ±5% variants like 1PMT5933B/TR7.

How is thermal performance achieved in the 1PMT5933C/TR7 package?

The 1PMT5933C/TR7 achieves 30°C/W junction-to-TAB1 thermal resistance via its Powermite® package design: the full metallic bottom provides direct thermal conduction to PCB copper, and the integral locking tab acts as both mechanical anchor and secondary heat path - enabling reliable 3.0 W dissipation when TAB 1 is thermally anchored.

Does 1PMT5933C/TR7 have ESD protection built-in?

Yes, the 1PMT5933C/TR7 has an ESD rating exceeding 16 kV per the Human Body Model (HBM), verified per JEDEC JS-001. This intrinsic robustness allows direct integration into I/O paths and sensor interfaces without requiring external ESD suppressors - simplifying layout and improving system-level surge immunity.

What does the "TR7" suffix indicate in 1PMT5933C/TR7?

The "TR7" suffix indicates tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format supports automated pick-and-place assembly and ensures consistent orientation (cathode TAB 1 facing designated direction) for high-yield SMT manufacturing of the 1PMT5933C/TR7.

Can 1PMT5933C/TR7 replace through-hole Zener diodes in existing designs?

Yes, the 1PMT5933C/TR7 can replace through-hole Zeners such as 1N5247B (22 V, ±5%, 500 mW) in new designs where space, thermal performance, and accuracy are prioritized - but requires PCB redesign to accommodate the DO-216 footprint and thermal pad layout. It is not a drop-in replacement due to differing package geometry and thermal interface requirements.