Microchip Technology 1PMT5949/TR13

Overview

1PMT5949B from Microsemi is a 100 V, 3.0 W surface-mount Zener diode in the Powermite® package, featuring a full metallic bottom to prevent solder flux entrapment and integral heat sink locking tabs for enhanced thermal dissipation. It delivers tight ±5% Zener voltage tolerance, 250 Ω dynamic impedance at 3.7 mA test current, and >16 kV HBM ESD rating, used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the 1PMT5949B datasheet, 1PMT5949B pinout, 1PMT5949B application, or 1PMT5949B equivalent, key selection criteria include its 100 V Zener voltage, 3.0 W DC power dissipation with TAB 1 at 60°C, 30°C/W junction-to-tab thermal resistance, and DO-216 mechanical outline compatibility with automated insertion equipment.

Technical Context

This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1. Its Powermite® package integrates a metallic thermal tab (TAB 1) that serves as both mechanical mounting point and primary heat path, enabling 3.0 W power handling without external heatsinking under defined thermal conditions.

Electrical behavior is characterized at TL = 30°C with Zener voltage measured 20 seconds after DC current application. Dynamic impedance (250 Ω) is derived using 60 Hz RMS AC current equal to 10% of IZT (3.7 mA), and reverse leakage remains ≤1 µA at VR = 76 V.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5375B and SZ1SMA100A, the 1PMT5949B uniquely combines 3.0 W continuous dissipation, DO-216 SMT compatibility, and integrated metallic heat sink tab-enabling high-power Zener functionality in space-constrained industrial designs without layout or thermal redesign.

Availability

1PMT5949B is available at Aetrix Electronics and suitable for industrial power supplies, telecom surge protection, automated test equipment calibration, and PLC input protection requiring stable component supply and long-lifecycle availability.

Supply support for 1PMT5949B 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 RF solutions for aerospace, defense, and industrial markets.

The Powermite® Zener diode product line was designed to deliver high-power voltage regulation and transient suppression in miniature surface-mount packages for space-constrained, thermally demanding applications.

FAQ

What is the Zener voltage tolerance for 1PMT5949B?

The 1PMT5949B has a standard Zener voltage tolerance of ±5% at 100 V nominal, measured at IZT = 3.7 mA with TAB 1 held at 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. This tolerance directly impacts regulation accuracy in feedback circuits, and the 1PMT5949B's specified 100 V ±5% ensures predictable clamping behavior in overvoltage protection designs.

How is thermal performance managed in the 1PMT5949B package?

The 1PMT5949B uses a Powermite® package with TAB 1 as the primary thermal path, achieving 30°C/W junction-to-tab thermal resistance. To realize the full 3.0 W power rating, TAB 1 must be soldered to a minimum 1 cm² copper pour on the PCB. The full metallic bottom and locking tab design eliminate flux traps and enhance heat transfer-critical for maintaining junction temperature below 150°C in industrial environments where the 1PMT5949B is commonly deployed.

Is the 1PMT5949B compatible with automated assembly processes?

Yes, the 1PMT5949B is fully compatible with automated insertion and reflow soldering equipment. It conforms to EIA-481 tape-and-reel packaging standards (7″ reel: 3,000 pcs; 13″ reel: 12,000 pcs) and features a DO-216 outline optimized for pick-and-place accuracy. Its symmetric lead geometry and metallic bottom prevent tombstoning and ensure coplanar solder joint formation-key reliability factors for high-volume manufacturing of products using the 1PMT5949B.

What is the maximum reverse voltage before breakdown for 1PMT5949B?

The 1PMT5949B maintains ≤1 µA reverse leakage current up to VR = 76 V. Breakdown occurs at the specified Zener voltage of 100 V (±5%) under DC test conditions at IZT = 3.7 mA. This 76 V maximum non-breakdown voltage defines the safe operating range for blocking applications, and the 1PMT5949B's low leakage ensures minimal power loss in standby modes of circuits where it serves as a voltage reference or clamp.

Does the 1PMT5949B meet any specific ESD or reliability standards?

Yes, the 1PMT5949B is rated for >16 kV per Human Body Model (HBM) ESD, verified per ANSI/ESDA/JEDEC JS-001. It also meets MIL-STD-750 Method 2019 for solderability and is qualified to operate across –55°C to +150°C junction and storage temperature ranges. These specifications make the 1PMT5949B suitable for harsh-environment applications including avionics, industrial controls, and telecom infrastructure where the 1PMT5949B's reliability is mission-critical.