Microchip Technology 1PMT5952/TR7

Overview

1PMT5952B from Microsemi is a 130 V, ±5% tolerance, 3.0 W surface-mount Zener diode in the Powermite® package (DO-216), featuring 450 Ω dynamic impedance at 2.9 mA test current, 1.0 µA max reverse leakage at 100 V, and thermal resistance of 30°C/W junction-to-tab. It serves as a precision voltage reference or overvoltage clamp in DC power rails and industrial sensor interfaces.

For engineers reviewing the 1PMT5952B datasheet, 1PMT5952B pinout, 1PMT5952B application, or 1PMT5952B equivalent, key selection criteria include zener voltage accuracy, power derating above 60°C tab temperature, low knee impedance for stable regulation near minimum current, and ESD robustness (>16 kV HBM) in automated assembly environments.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 130 V at 2.9 mA (IZT), exhibiting 450 Ω dynamic impedance (ZZT) and 5000 Ω knee impedance (ZZK) at 0.25 mA (IZK). Its DO-216 package integrates a full metallic bottom and locking tab for mechanical stability and thermal conduction to PCB copper.

The device supports continuous DC power dissipation up to 3.0 W when TAB 1 is maintained at ≤60°C, with junction temperature rated from –55°C to +150°C. Reverse leakage remains ≤1.0 µA at VR = 100 V, and forward voltage is 1.2 V at 200 mA.

Key Specifications

Pinout & Package

Package: DO-216 (Powermite®), molded surface-mount with full metallic bottom and integral locking tab. Cathode is designated by TAB 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1PMT5952B, SMCJ130A offers superior transient energy handling but lacks DC regulation precision, while 1N5379B provides higher power rating in a non-SMT form factor-neither matches the 1PMT5952B's combination of SMT fit, thermal performance, and ±5% DC voltage accuracy in a 3 W package.

Availability

1PMT5952B is available at Aetrix Electronics and suitable for industrial power monitoring, telecom line protection, automotive battery supervision, and medical sensor biasing requiring stable component supply and long-term obsolescence management.

Supply support for 1PMT5952B 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 series-including 1PMT5952B-is engineered for surface-mount voltage regulation and clamping in space-constrained, thermally demanding applications where automated assembly and long-term stability are critical.

FAQ

What is the zener voltage tolerance for 1PMT5952B?

The 1PMT5952B has a standard zener voltage tolerance of ±5% at 130 V, measured at 2.9 mA test current and TAB 1 temperature of 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request. This tolerance directly impacts regulation accuracy in precision reference circuits, especially when used without post-calibration trimming.

How does thermal resistance affect the usable power of 1PMT5952B?

The 1PMT5952B has a junction-to-TAB 1 thermal resistance of 30°C/W. At TAB 1 temperatures above 60°C, its 3.0 W power rating must be linearly derated to prevent exceeding the +150°C maximum junction temperature. For example, at TAB 1 = 100°C, maximum allowable power drops to 1.5 W. Proper PCB copper area under TAB 1 is essential to maintain safe operation.

Can 1PMT5952B be used in place of a through-hole Zener like 1N5379B?

No, 1PMT5952B is not a drop-in replacement for 1N5379B due to different packages (DO-216 vs. DO-201AD), mounting methods, and thermal paths. While both are 130 V Zeners, 1PMT5952B relies on TAB 1 conduction to PCB copper, whereas 1N5379B uses lead-frame convection. Layout redesign and thermal validation are required if substituting 1PMT5952B into a through-hole design.

What is the significance of the 1.0 µA reverse leakage specification for 1PMT5952B?

The 1.0 µA maximum reverse leakage at 100 V reverse voltage ensures minimal parasitic current draw in high-impedance sensing or reference circuits. In applications like battery-backed supervisors or ultra-low-power sensor biasing, this low leakage preserves signal integrity and extends operational life-especially critical where input bias currents must remain below 10 µA.

Is 1PMT5952B compatible with lead-free reflow profiles?

Yes, 1PMT5952B is qualified for lead-free reflow processing per J-STD-020. Its DO-216 Powermite® package withstands peak temperatures up to 260°C for 10 seconds. The full metallic bottom enhances thermal uniformity during reflow, reducing voiding risk and improving solder joint reliability-key for automotive and industrial applications requiring AEC-Q200 alignment.