Microchip Technology 1PMT5942CE3/TR13

Overview

1PMT5942CE3/TR13 from Microsemi is a 51 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 70 Ω dynamic impedance at 7.3 mA test current and 1100 µA max reverse leakage at 38.8 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation circuits.

For engineers reviewing the 1PMT5942CE3/TR13 datasheet, 1PMT5942CE3/TR13 pinout, 1PMT5942CE3/TR13 application, or 1PMT5942CE3/TR13 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance (450 Ω at 0.25 mA), and compatibility with automated SMT assembly per EIA-481 tape-and-reel packaging.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or line conditions. Its Powermite® package integrates a full metallic bottom and locking tab that functions as both mechanical anchor and thermal path to PCB copper, enabling efficient heat transfer from junction to TAB 1.

The device exhibits tight voltage regulation with 70 Ω dynamic impedance at I_ZT = 7.3 mA and maintains low reverse leakage (≤1100 µA at V_R = 38.8 V), supporting reliable clamping in transient suppression and feedback loop applications where stability at elevated temperatures (-55°C to +150°C) is required.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral locking tab; cathode designated by TAB 1; weight ≈ 0.016 g; mounting position unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5355B and BZX84-C51, the 1PMT5942CE3/TR13 delivers superior thermal performance (30°C/W vs. 65°C/W or unlisted), integrated mechanical anchoring, and verified 3.0 W capability-making it the only option among the three qualified for high-reliability, high-power SMT voltage regulation.

Availability

1PMT5942CE3/TR13 is available at Aetrix Electronics and suitable for switching power supplies, industrial overvoltage protection circuits, programmable voltage references, and temperature-stable bias networks requiring stable component supply and traceable sourcing.

Supply support for 1PMT5942CE3/TR13 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 management, mechanical robustness, and automated assembly compatibility are essential-targeting power conversion, protection, and precision reference applications.

FAQ

What is the Zener voltage tolerance for 1PMT5942CE3/TR13?

The 1PMT5942CE3/TR13 has a standard Zener voltage tolerance of ±5% at 51 V, measured at I_ZT = 7.3 mA with TAB 1 held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D, respectively, but the CE3 designation confirms the ±5% version. This tolerance directly impacts regulation accuracy in feedback and reference circuits.

How is thermal management handled in the 1PMT5942CE3/TR13 package?

The 1PMT5942CE3/TR13 uses a Powermite® package with a full metallic bottom and integral locking tab that serves as the primary thermal path from junction to PCB. Its specified thermal resistance is 30°C/W junction-to-TAB 1, meaning effective heat sinking requires direct soldering of TAB 1 to a copper pour. This design eliminates flux entrapment and enhances reliability over conventional plastic packages.

What does the 'TR13' suffix indicate in 1PMT5942CE3/TR13?

The 'TR13' suffix denotes EIA-481 compliant tape-and-reel packaging on a 13-inch reel containing 12,000 units-optimized for high-volume automated SMT placement. This packaging format ensures consistent orientation, mechanical protection during handling, and compatibility with industry-standard feeders, distinguishing it from smaller 7-inch reels (TR7) holding 3,000 units.

Can 1PMT5942CE3/TR13 be used in place of through-hole Zeners like 1N5355B?

While both 1PMT5942CE3/TR13 and 1N5355B share a 51 V Zener rating, they differ critically in package, thermal performance, and mounting method. The 1PMT5942CE3/TR13 is surface-mount with 30°C/W thermal resistance and metallic bottom; the 1N5355B is axial-lead DO-204AL with ~65°C/W. Direct substitution requires PCB redesign and thermal validation-1PMT5942CE3/TR13 is not a drop-in replacement.

What is the maximum reverse leakage current for 1PMT5942CE3/TR13?

The maximum reverse leakage current for 1PMT5942CE3/TR13 is 1100 µA at V_R = 38.8 V, measured at T_L = 30°C. This parameter is critical for low-power applications such as high-impedance bias networks or standby-mode clamping, where excessive leakage could disrupt circuit operation or increase quiescent power consumption.