Microchip Technology 1PMT5949/TR7

Overview

1PMT5949B from Microsemi is a 100 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 250 Ω dynamic impedance at 3.7 mA test current and 3100 µA max reverse leakage at 76 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback networks.

For engineers reviewing the 1PMT5949B datasheet, 1PMT5949B pinout, 1PMT5949B application, or 1PMT5949B equivalent, key selection criteria include its 100 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, ESD rating >16 kV HBM, and compatibility with automated SMT insertion equipment.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its Powermite® package integrates a full metallic bottom (TAB 1) as cathode and thermal path, enabling direct PCB heat sinking without flux entrapment risk.

The device exhibits tight voltage control with 250 Ω dynamic impedance at I_ZT = 3.7 mA and maintains low reverse leakage (≤3100 µA at V_R = 76 V), supporting reliable clamping in industrial power supplies and protection circuits where thermal stability and ESD robustness (>16 kV HBM) are critical.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216), molded surface-mount package with full metallic bottom (TAB 1) acting as cathode terminal and integral heat sink. Cathode is unambiguously designated by TAB 1; mounting orientation is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ100A and 1N5375B, the 1PMT5949B uniquely combines SMT manufacturability, 3.0 W DC power handling, and precision 100 V regulation in a thermally optimized package - making it optimal for compact, high-reliability DC clamp and reference designs where both steady-state accuracy and thermal performance matter.

Availability

1PMT5949B is available at Aetrix Electronics and suitable for industrial power supply clamping, automotive ECU protection, and telecom line card surge suppression requiring stable component supply, consistent parametric performance, 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 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 delivers high-power surface-mount voltage regulation in miniature packages, targeting space-constrained power management and protection circuits where thermal efficiency and assembly compatibility are essential.

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 3.7 mA test current with TAB 1 held at 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D respectively, but the base 1PMT5949B part carries the ±5% specification as documented in MSC0995 Rev F.

How is thermal management implemented in the 1PMT5949B package?

The 1PMT5949B uses the Powermite® package with a full metallic bottom (TAB 1) serving as both cathode and primary thermal path. With a specified junction-to-TAB1 thermal resistance of 30°C/W, effective heat transfer requires soldering TAB 1 to a sufficient copper area on the PCB. This eliminates reliance on lead-frame conduction alone.

Is the 1PMT5949B compatible with standard SMT reflow processes?

Yes, the 1PMT5949B is designed for compatibility with automatic insertion equipment and standard SMT reflow profiles. Its molded Powermite® package withstands typical lead-free reflow temperatures, and the full metallic bottom prevents solder flux entrapment - reducing post-assembly cleaning requirements and improving process yield.

What is the maximum reverse leakage current for 1PMT5949B?

The 1PMT5949B specifies a maximum reverse leakage current of 3100 µA at a reverse voltage of 76 V, tested at TL = 30°C. This value reflects worst-case leakage under defined conditions and supports use in low-power standby circuits where minimal quiescent current is critical.

Does the 1PMT5949B have an industry-standard package outline?

Yes, the 1PMT5949B conforms to the DO-216 mechanical outline, with all dimensions specified in inches (±0.005") in the MSC0995 datasheet. This standardization ensures compatibility with existing pick-and-place feeders, stencil apertures, and board layout libraries used for surface-mount Zener diodes.