Microchip Technology 1PMT5949E3/TR13

Overview

1PMT5949E3/TR13 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 temperature of 60°C, with 250 Ω dynamic impedance at 3.7 mA test current and ESD rating >16 kV (HBM), used for precision voltage regulation and overvoltage protection in power supply feedback loops.

For engineers reviewing the 1PMT5949E3/TR13 datasheet, 1PMT5949E3/TR13 pinout, 1PMT5949E3/TR13 application, or 1PMT5949E3/TR13 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB1), reverse leakage (<1 µA at 76 V), compatibility with automatic insertion equipment, and tape-and-reel packaging per EIA-481 standard.

Technical Context

This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1, requiring no external biasing circuitry. Its full metallic bottom and integral heat sink locking tab enable reliable thermal conduction to PCB copper, supporting stable regulation under continuous 3.0 W dissipation when mounted on adequate thermal pads.

The device exhibits tight knee characteristics (IZK = 0.25 mA, ZZK = 3100 Ω) and low reverse leakage (IR ≤ 1 µA at VR = 76 V), making it suitable for low-current reference and clamping applications where stability across -55°C to +150°C junction temperature range is critical.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral heat sink locking tab; cathode identified by TAB 1; weight ≈ 0.016 g; compatible with EIA-481 tape-and-reel (13-inch reel: 12,000 pcs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ100A and 1N5375B, the 1PMT5949E3/TR13 uniquely combines SMT compatibility, 3.0 W continuous regulation capability, and sub-1 µA leakage-making it optimal for space-constrained, thermally managed, precision-clamping designs.

Availability

1PMT5949E3/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and programmable logic controller input protection requiring stable component supply and consistent parametric performance across production lots.

Supply support for 1PMT5949E3/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 radiation-hardened components for aerospace, defense, and industrial markets.

The Powermite® Zener diode product line delivers high-power surface-mount voltage regulation in compact packages, targeting applications demanding thermal efficiency, automated assembly compatibility, and extended temperature operation.

FAQ

What is the Zener voltage tolerance for 1PMT5949E3/TR13?

The 1PMT5949E3/TR13 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%, ±1%) are available with suffixes C and D respectively, but the E3 suffix denotes the standard ±5% version. This tolerance directly impacts regulation accuracy in feedback and reference circuits.

How is thermal performance defined for 1PMT5949E3/TR13?

The 1PMT5949E3/TR13 specifies a thermal resistance of 30°C/W from junction to TAB 1, meaning each watt dissipated raises the junction temperature 30°C above TAB 1 temperature. At 60°C TAB 1, the device sustains its full 3.0 W rating. Proper PCB copper area under TAB 1 is essential to maintain this thermal path and avoid derating.

Is 1PMT5949E3/TR13 compatible with lead-free reflow processes?

Yes, the 1PMT5949E3/TR13 Powermite® package is qualified for standard lead-free reflow profiles, including peak temperatures up to 260°C. Its molded construction and metallic bottom ensure mechanical integrity and solder joint reliability. The full metallic bottom also prevents flux entrapment, reducing post-reflow cleaning requirements and improving long-term interconnect stability.

What does the "TR13" suffix indicate in 1PMT5949E3/TR13?

The "TR13" suffix indicates tape-and-reel packaging on a 13-inch reel containing 12,000 units, compliant with EIA-481 standards. This format is optimized for high-speed automated placement equipment. The "E3" portion denotes the ±5% Zener voltage tolerance and confirms the device meets Microsemi's standard Powermite® specifications per MSC0995 revision F.

Can 1PMT5949E3/TR13 be used in place of through-hole Zeners like 1N5375B?

The 1PMT5949E3/TR13 can replace 1N5375B in applications where surface-mount assembly, smaller footprint, and automated handling are priorities-but only if the 3.0 W rating suffices. While both regulate at 100 V, the 1N5375B offers 5 W and lower thermal resistance (25°C/W), whereas the 1PMT5949E3/TR13 provides superior ESD rating (>16 kV vs. ~8 kV) and flux-free assembly. Layout and thermal design must be re-validated.