Microchip Technology 1PMT5927/TR13

Overview

1PMT5927B from Microsemi is a 12 V, ±5% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 6.5 Ω dynamic impedance at 31.2 mA test current and thermal resistance of 30°C/W junction-to-TAB1 - used for precision voltage regulation and overvoltage protection in compact DC-DC converter feedback loops.

For engineers reviewing the 1PMT5927B datasheet, 1PMT5927B pinout, 1PMT5927B application, or 1PMT5927B equivalent, key selection criteria include zener voltage tolerance, power derating above 60°C, knee current (0.25 mA), reverse leakage (<1 µA at 9.1 V), and compatibility with EIA-481 tape-and-reel automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its Powermite® package integrates a full metallic bottom and locking tab that serves as both mechanical anchor and thermal path to PCB copper, enabling direct heat conduction from junction to TAB 1.

The device exhibits low dynamic impedance (6.5 Ω) at I_ZT = 31.2 mA and tight knee behavior (I_ZK = 0.25 mA, Z_ZK = 550 Ω), supporting reliable regulation even at low bias currents - critical for low-power standby circuits and precision sensing interfaces.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral locking tab; cathode designated by TAB 1; weight ≈ 0.016 g; compatible with EIA-481 tape-and-reel (7″/3,000 pcs or 13″/12,000 pcs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF12A and BZX84-C12, the 1PMT5927B uniquely delivers 3.0 W DC regulation capability in a surface-mount package with validated thermal path to TAB 1 - making it suitable for sustained voltage reference and clamping where power and thermal performance are non-negotiable.

Availability

1PMT5927B is available at Aetrix Electronics and suitable for DC-DC converter feedback, overvoltage protection clamp, and low-power sensor reference applications requiring stable component supply and consistent parametric performance across production lots.

Supply support for 1PMT5927B 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 engineered for high-power density surface-mount voltage regulation in space-constrained, thermally demanding environments - prioritizing thermal efficiency, assembly robustness, and parametric consistency.

FAQ

What is the zener voltage tolerance for 1PMT5927B?

The 1PMT5927B has a standard zener voltage tolerance of ±5% at I_ZT = 31.2 mA and T_C = 30°C. Tighter tolerances (±2% with suffix C, ±1% with suffix D) are available as custom order options but are not applicable to the base 1PMT5927B part number. Voltage measurement must be performed 20 seconds after applying DC current to ensure thermal stabilization.

Can 1PMT5927B be used in place of a through-hole 1N5242B?

No - the 1PMT5927B is not a drop-in replacement for the 1N5242B. While both regulate at ~12 V, the 1PMT5927B is a 3.0 W surface-mount device with TAB 1 cathode and thermal design dependent on PCB copper, whereas the 1N5242B is a 0.5 W through-hole device with different thermal path and mounting requirements. Substitution requires layout and thermal redesign.

What is the maximum reverse voltage the 1PMT5927B can withstand before breakdown?

The 1PMT5927B begins controlled reverse breakdown at its nominal zener voltage of 12 V. Its specified reverse voltage V_R is 9.1 V at which reverse leakage remains ≤1 µA. Operation above 12 V is intentional and normal in regulation mode; sustained voltage significantly above 12 V without current limiting will exceed its 3.0 W power rating and cause failure.

How does the Powermite® package improve thermal performance compared to SOD-123?

The Powermite® package improves thermal performance over SOD-123 by integrating a full metallic bottom and locking tab that provides direct thermal conduction from the silicon junction to TAB 1, achieving 30°C/W junction-to-TAB1. In contrast, SOD-123 relies on lead-frame conduction with typical θ_JA > 200°C/W - making the 1PMT5927B capable of dissipating 3.0 W continuously where SOD-123 parts are typically limited to ≤0.5 W.

Is tape-and-reel packaging available for 1PMT5927B, and what are the standard reel sizes?

Yes, 1PMT5927B is supplied in EIA-481 compliant tape-and-reel packaging. Standard configurations are 7-inch reels containing 3,000 units and 13-inch reels containing 12,000 units - both compatible with industry-standard pick-and-place equipment and supporting high-volume automated assembly without manual handling.