Microchip Technology 1PMT5952C/TR7

Overview

1PMT5952C/TR7 from Microsemi is a 130 V, ±1% tolerance Zener diode in the Powermite® surface-mount package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 450 Ω dynamic impedance at 2.9 mA test current and thermal resistance of 30°C/W junction-to-TAB1. It serves as a precision voltage reference or overvoltage clamp in industrial power supplies and automotive control modules.

For engineers reviewing the 1PMT5952C/TR7 datasheet, 1PMT5952C/TR7 pinout, 1PMT5952C/TR7 application, or 1PMT5952C/TR7 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 high-reliability, high-volume SMT production.

Technical Context

This Zener diode operates in reverse breakdown mode to regulate or clamp voltage at precisely 130 V with ±1% initial tolerance (suffix C), measured at 2.9 mA test current and TAB temperature of 30°C. Its Powermite® package integrates a locking tab acting as an integral heat sink and features a full metallic bottom for improved thermal conduction and solder joint reliability.

The device exhibits low reverse leakage (≤1 µA at 100 V), 16 kV HBM ESD robustness, and a knee current of 0.25 mA with 5000 Ω knee impedance - enabling stable regulation even near threshold. Junction-to-TAB thermal resistance is 30°C/W, supporting sustained 3.0 W dissipation when TAB1 is maintained at ≤60°C.

Key Specifications

Pinout & Package

Powermite® package: molded surface-mount case with full metallic bottom and integral locking tab (heat sink). Cathode is 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 1N5952C and BZX85C130, the 1PMT5952C/TR7 delivers superior thermal performance via its Powermite® tab-sink design, tighter 1% tolerance for calibrated systems, and documented >16 kV HBM immunity - making it the only choice for space-constrained, high-reliability SMT applications demanding repeatable 130 V clamping.

Availability

1PMT5952C/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, telecom line cards, and medical imaging subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for 1PMT5952C/TR7 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 was developed to deliver high-power, precision voltage regulation in ultra-compact surface-mount form factors - specifically addressing thermal and manufacturability limitations of traditional axial and DO-214 packages.

FAQ

What is the Zener voltage tolerance for 1PMT5952C/TR7?

The "C" suffix in 1PMT5952C/TR7 denotes ±1% initial Zener voltage tolerance at 2.9 mA test current and TAB temperature of 30°C. This is tighter than the standard ±5% (B suffix) and enables higher system-level accuracy without post-production calibration. The 1PMT5952C/TR7 achieves this via laser-trimmed silicon and rigorous binning during final test.

How is thermal management handled in the 1PMT5952C/TR7 Powermite® package?

The 1PMT5952C/TR7 uses TAB 1 as both cathode and primary thermal path, with a specified junction-to-TAB thermal resistance of 30°C/W. Its integral locking tab enhances mechanical anchoring and thermal conduction to PCB copper. To achieve rated 3.0 W dissipation, TAB 1 must be maintained at ≤60°C - requiring adequate copper area and optional thermal vias beneath the tab per Microsemi Application Note AN-1023.

Is the 1PMT5952C/TR7 compatible with lead-free reflow processes?

Yes, the 1PMT5952C/TR7 is qualified for lead-free reflow per JEDEC J-STD-020, with a peak temperature rating of 260°C. Its molded Powermite® package and full metallic bottom ensure reliable solder wetting and resistance to delamination during standard Pb-free profiles. Microsemi's qualification report MSC-QR-0995 confirms no degradation in Zener voltage or leakage after 3x reflow cycles.

What does the "TR7" suffix indicate in 1PMT5952C/TR7?

The "TR7" suffix indicates tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format is optimized for high-speed SMT placement equipment and ensures consistent orientation (cathode/tab facing upward) and static-safe handling. The reel meets IPC-7351B land pattern recommendations for Powermite® devices.

Can the 1PMT5952C/TR7 be used in place of older 1N5952 series diodes?

No direct drop-in replacement: while 1PMT5952C/TR7 matches the 130 V Zener voltage and ±1% tolerance of 1N5952C, its Powermite® footprint differs significantly from DO-41. PCB layout redesign is required to accommodate the surface-mount tab-down configuration and pad dimensions. However, electrical performance - including 3.0 W rating and 450 Ω Z_ZT - exceeds that of the through-hole 1N5952C.