Microchip Technology 1PMT5946C/TR13

Overview

1PMT5946C/TR13 from Microsemi is a 75 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 140 Ω dynamic impedance at 5.0 mA test current and thermal resistance of 30°C/W junction-to-TAB1. It serves as a precision voltage reference or overvoltage clamp in high-reliability power supply rails.

For engineers reviewing the 1PMT5946C/TR13 datasheet, 1PMT5946C/TR13 pinout, 1PMT5946C/TR13 application, or 1PMT5946C/TR13 equivalent, key selection criteria include its tight 1% voltage tolerance, ESD rating >16 kV HBM, full metallic bottom eliminating flux entrapment, and compatibility with automated insertion equipment - all critical for industrial power management and automotive body electronics.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its DO-216 package features a cathode designated by TAB 1, full metallic bottom for thermal and assembly reliability, and integral locking tabs acting as heat sinks.

Designed for operation from −55°C to +150°C junction temperature, it delivers 75 V nominal Zener voltage at 5.0 mA test current (IZT), with 2000 µA maximum reverse leakage at 60 V (VR) and 56 mA maximum Zener current (IZM) derived from its 3.0 W power rating.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216), molded surface-mount package with full metallic bottom and integral heat-sink locking tab; cathode identified by TAB 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF75A and BZX84-C75, the 1PMT5946C/TR13 uniquely balances 3.0 W steady-state power, ±1% DC accuracy, and robust thermal design - making it suitable for regulated power rails requiring both precision and durability, unlike pulse-focused TVS or low-power SOT Zeners.

Availability

1PMT5946C/TR13 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive body control modules, telecom DC-DC converter feedback, and renewable energy charge controllers requiring stable component supply and long-lifecycle support.

Supply support for 1PMT5946C/TR13 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 to deliver high-power surface-mount voltage regulation in thermally demanding environments where traditional through-hole packages were unsuitable.

FAQ

What is the Zener voltage tolerance for 1PMT5946C/TR13?

The "C" suffix in 1PMT5946C/TR13 denotes ±1% Zener voltage tolerance at 5.0 mA test current and TAB 1 temperature of 30°C. This tighter tolerance enables use in precision reference applications where standard ±5% parts would require additional calibration or trimming circuitry. The 1PMT5946C/TR13 achieves this specification without derating across its full −55°C to +150°C operating range.

How is thermal management handled in the 1PMT5946C/TR13 package?

The 1PMT5946C/TR13 uses a Powermite® package with a full metallic bottom and integral locking tab that serves as both mechanical anchor and primary heat sink. Its specified thermal resistance is 30°C/W junction-to-TAB1, meaning effective thermal performance depends on direct connection of TAB 1 to a large copper area or external heatsink. Unlike plastic-bodied diodes, the metal bottom prevents flux entrapment and improves long-term thermal interface reliability.

Is 1PMT5946C/TR13 compatible with lead-free reflow processes?

Yes, the 1PMT5946C/TR13 is qualified for standard lead-free reflow profiles including JEDEC J-STD-020, with a maximum peak temperature of 260°C. Its molded Powermite® package and metallic terminations withstand multiple reflow cycles without delamination or solder wetting degradation. The full metallic bottom also promotes uniform heating and minimizes warpage risk during assembly.

What does the "TR13" suffix indicate in 1PMT5946C/TR13?

The "TR13" suffix indicates tape-and-reel packaging per EIA Standard 481 on a 13-inch reel containing 12,000 units. This format supports high-speed automated placement equipment and ensures consistent orientation (cathode marked by TAB 1) throughout the reel. The packaging is moisture-sensitive level 1 (MSL-1), requiring no dry-pack or baking prior to assembly.

Can 1PMT5946C/TR13 be used as a replacement for through-hole Zener diodes like 1N5364B?

The 1PMT5946C/TR13 provides equivalent 75 V Zener functionality but is not a drop-in replacement for 1N5364B due to different package (Powermite® DO-216 vs. DO-41) and thermal path (TAB 1 conduction vs. lead conduction). While electrical parameters align closely, PCB layout must accommodate the surface-mount footprint and thermal pad requirements. Its 3.0 W rating matches 1N5364B's 5 W rating only at controlled TAB 1 temperature - full derating curves must be consulted for system-level validation.