Microchip Technology 1PMT5948C/TR7

Overview

1PMT5948C/TR7 from Microsemi is a 91 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 200 Ω dynamic impedance at 4.1 mA test current and 30°C/W thermal resistance from junction to TAB 1 - used for precision voltage regulation in space-constrained industrial power supplies.

For engineers reviewing the 1PMT5948C/TR7 datasheet, 1PMT5948C/TR7 pinout, 1PMT5948C/TR7 application, or 1PMT5948C/TR7 equivalent, key selection criteria include tight voltage tolerance (±1%), low reverse leakage (<1 µA at 69.2 V), ESD robustness (>16 kV HBM), thermal performance under PCB-mounted conduction cooling, and compatibility with EIA-481 tape-and-reel automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage across load variations and temperature shifts. Its Powermite® package features a full metallic bottom for flux-free soldering and an integral locking tab that serves as both mechanical anchor and primary heat path to the PCB.

Designed for DC voltage regulation rather than transient suppression, it exhibits 69.2 V maximum zener current (IZM) at 3.0 W, 1 µA max reverse leakage at VR = 69.2 V, and 30°C/W junction-to-tab thermal resistance - enabling reliable operation up to +150°C junction temperature when properly mounted on thermally enhanced pads.

Key Specifications

Pinout & Package

Powermite® surface-mount package (DO-216 compatible footprint) with molded body, full metallic bottom, and cathode designated by TAB 1. Mounting orientation is unrestricted; weight ≈ 0.016 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF91A and BZX84-C91, the 1PMT5948C/TR7 delivers three times the power dissipation in a thermally optimized package with tighter tolerance and superior ESD immunity - making it the sole option among the three qualified for 3 W conduction-cooled regulation in industrial and aerospace systems.

Availability

1PMT5948C/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, avionics reference circuits, and telecom line card designs requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for 1PMT5948C/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 RF solutions for aerospace, defense, and industrial markets.

The Powermite® Zener diode product line was engineered for high-power surface-mount voltage regulation where thermal performance, mechanical robustness, and precision tolerance are critical - targeting applications beyond standard DO-41 or SOD-123 capabilities.

FAQ

What is the Zener voltage tolerance for 1PMT5948C/TR7?

The "C" suffix in 1PMT5948C/TR7 denotes ±1% Zener voltage tolerance at 4.1 mA test current and 30°C case temperature. This is tighter than the standard ±5% (B suffix) and supports high-accuracy voltage references without post-production trimming. The 1PMT5948C/TR7 achieves this via laser-trimmed wafer-level process control and is verified per Microsemi's qualification standards.

How is thermal management handled for 1PMT5948C/TR7 in PCB design?

Thermal management for 1PMT5948C/TR7 relies on conduction through TAB 1 to the PCB. With 30°C/W junction-to-tab thermal resistance, a 100 mm² 2-oz copper pad reduces junction temperature rise to ~90°C at 3.0 W. The full metallic bottom ensures void-free solder joints, and the locking tab mechanically anchors the device during thermal cycling - critical for 1PMT5948C/TR7 reliability in extended-temperature deployments.

Is 1PMT5948C/TR7 compatible with automated SMT assembly?

Yes, 1PMT5948C/TR7 is fully compatible with automated SMT assembly. It uses EIA-481 tape-and-reel packaging (7″ reel, 3,000 pcs), features a locking tab that prevents rotation during pick-and-place, and has a flux-free metallic bottom that eliminates solder voids. Its DO-216 footprint aligns with standard vision-guided placement systems - confirmed in Microsemi's application note AN-1027 for Powermite® devices.

What is the maximum reverse leakage current for 1PMT5948C/TR7?

The maximum reverse leakage current for 1PMT5948C/TR7 is 1 µA at VR = 69.2 V and TL = 30°C. This value is measured per Microsemi's test condition defined in MSC0995 Rev F and reflects the device's ability to minimize standby power loss in high-impedance bias networks - a key parameter for battery-backed or energy-sensitive systems using the 1PMT5948C/TR7.

Does 1PMT5948C/TR7 meet any specific industry reliability standards?

1PMT5948C/TR7 is manufactured under ISO 9001-certified processes and qualified to operate from –55°C to +150°C junction temperature. It carries >16 kV ESD rating per Human Body Model (HBM), exceeding JEDEC JS-001 Class 3A requirements. While not explicitly screened to MIL-PRF-19500 or AEC-Q200, its construction and test data support use in industrial and avionics applications where the 1PMT5948C/TR7 is deployed per customer qualification protocols.