STMicroelectronics STP140NF55

Overview

STP140NF55 from STMicroelectronics is an N-channel enhancement-mode Power MOSFET in TO-220 package, rated for 55 V V_DS, 80 A continuous drain current at T_C = 25°C, and 0.0065 Ω typical R_DS(on) at V_GS = 10 V. It features rugged avalanche capability (E_AS = 1.3 J), fast switching (t_d(on) = 30 ns, t_f = 45 ns), and is optimized for high-current motor control and DC-DC power conversion.

For engineers reviewing the STP140NF55 datasheet, STP140NF55 pinout, STP140NF55 application, or STP140NF55 equivalent, this page delivers verified electrical ratings, thermal resistance (R_thj-case = 0.5 °C/W), gate charge (Q_g = 142 nC), diode recovery performance (t_rr = 90 ns), and package-specific mechanical data for reliable PCB layout and thermal design.

Technical Context

This MOSFET employs ST's StripFET™ II process with single-feature-size strip geometry to achieve high cell density and low on-resistance. Its SOA is defined up to 320 A pulsed drain current and supports unclamped inductive switching with controlled dv/dt (10 V/ns) and robust body diode recovery (I_RSM = 6.5 A).

The device operates with a gate threshold voltage of 2–4 V and exhibits stable R_DS(on) over temperature (normalized to 1.5× at 150°C). Thermal resistance junction-to-case is fixed at 0.5 °C/W for TO-220 mounting, enabling predictable heatsink sizing in high-power linear and switching topologies.

Key Specifications

Pinout & Package

STP140NF55 uses the standard TO-220 package (3-pin, through-hole, vertical mount) with isolated tab. The metal tab is electrically connected to the drain (D), requiring insulating hardware when mounted to grounded heatsinks.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel power MOSFET applications.

Compared with IRF1404PBF and IXTH120N50L, STP140NF55 offers optimal balance of 55 V rating, ultra-low R_DS(on), and TO-220 thermal performance-making it uniquely suited for high-current, medium-voltage industrial switching where efficiency and avalanche ruggedness are co-critical.

Availability

STP140NF55 is available at Aetrix Electronics and suitable for motor control, industrial DC-DC conversion, and solar charge management requiring stable component supply and long-term manufacturing continuity.

Supply support for STP140NF55 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs, discrete components, and MEMS sensors for industrial, automotive, and consumer markets.

STP140NF55 belongs to the STripFET™ II Power MOSFET product line, engineered specifically for high-efficiency, high-reliability power switching in industrial motor drives and power supplies where low R_DS(on) and rugged avalanche behavior are essential.

FAQ

What is the maximum safe operating temperature for STP140NF55?

The STP140NF55 has a maximum junction temperature (T_j) of 175°C and a storage temperature range of –55°C to +175°C. For reliable long-term operation, keep T_j ≤ 150°C under continuous load. With R_thj-case = 0.5 °C/W and 300 W total dissipation at T_C = 25°C, proper heatsinking is mandatory to avoid thermal runaway at high current.

Does STP140NF55 require a gate resistor, and what value is recommended?

Yes-a gate resistor is required to control dV/dt and suppress ringing. For 4.7 Ω (as used in the datasheet switching test), turn-on delay is 30 ns and fall time is 45 ns. Lower values (e.g., 2.2 Ω) reduce switching loss but increase EMI risk; higher values (e.g., 10 Ω) improve stability but raise switching loss. Layout-dependent optimization is advised.

Can STP140NF55 be used in parallel configurations?

Yes-its positive temperature coefficient of R_DS(on) enables current sharing in parallel operation. However, matched gate drive routing, symmetrical PCB layout, and individual gate resistors are mandatory. Derate total current by ≥15% versus sum of individual ratings to account for thermal coupling and parameter spread.

Is the TO-220 tab of STP140NF55 electrically isolated?

No-the metal tab is internally connected to the drain (pin 3). When mounting to a heatsink, use an insulating washer and shoulder washer to prevent shorting. Electrical isolation must be verified with a multimeter before power-up; failure to insulate may cause catastrophic system ground faults.