STMicroelectronics STWA12N120K5

Overview

STWA12N120K5 from STMicroelectronics is a high-voltage N-channel Power MOSFET using MDmesh K5 technology, designed for primary-side switching in 1200 V hard-switched and resonant topologies. It delivers 12 A continuous drain current at T_C = 25 °C, 620 mΩ typical R_DS(on), 44.2 nC total gate charge, and 100% avalanche-tested ruggedness - enabling high-efficiency PFC and industrial SMPS designs.

For engineers reviewing the STWA12N120K5 datasheet, STWA12N120K5 pinout, STWA12N120K5 application, or STWA12N120K5 equivalent, key selection criteria include its 1200 V V_(BR)DSS, ultra-low Q_g/R_DS(on) FoM, TO-247 long leads thermal performance (R_thJC = 0.5 °C/W), and Zener-protected gate robustness against transient overstress.

Technical Context

This device implements a proprietary vertical MDmesh K5 structure that reduces specific on-resistance by >30% versus prior-generation 1200 V superjunction MOSFETs while maintaining dv/dt ruggedness of 50 V/ns under 960 V bias. Its optimized cell layout minimizes C_oss (110 pF) and Crss (0.6 pF), supporting high-frequency operation up to 100 kHz in phase-shifted full-bridge converters.

The integrated Zener-protected gate ensures ±30 V V_GS tolerance and eliminates external gate clamping in flyback and LLC primary switches. The source-drain diode exhibits 630 ns trr and 12.6 μC Q_rr at 125 °C, enabling soft-recovery behavior in quasi-resonant circuits without requiring external snubbers.

Key Specifications

Pinout & Package

STWA12N120K5 uses the TO-247 long leads package (mechanical data per Table 11, DS8621 Rev 6), featuring insulated leads for improved high-voltage creepage and mechanical robustness in automated assembly. The package has a junction-to-case thermal resistance of 0.5 °C/W and supports direct heatsink mounting via the drain-connected tab.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage switching applications.

Compared with STW12N120K5, STWA12N120K5 offers extended creepage for safety-critical isolation, while IXTH12N120P trades ruggedness for marginally lower cost - making STWA12N120K5 optimal for certified industrial and EV infrastructure where reliability outweighs minor BOM savings.

Availability

STWA12N120K5 is available at Aetrix Electronics and suitable for industrial SMPS, EV charging PFC, photovoltaic inverters, and high-voltage UPS systems requiring stable component supply across multi-year production cycles.

Supply support for STWA12N120K5 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STWA12N120K5 belongs to the MDmesh K5 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in 800–1000 V DC bus applications such as server PSUs, renewable energy converters, and industrial motor drives.

FAQ

What is the maximum continuous drain current at 100 °C case temperature?

The STWA12N120K5 supports 7.6 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS8621 Rev 6. This derating reflects thermal limitations of the TO-247 long leads package and must be applied when heatsink temperature exceeds 75 °C in enclosed environments.

Does STWA12N120K5 require an external gate resistor for safe operation?

Yes - a minimum 5 Ω gate resistor is recommended to dampen ringing and limit peak gate current during turn-on/turn-off. The 3 Ω intrinsic gate resistance (Table 5) combined with PCB trace inductance can cause oscillation without external damping, especially in half-bridge configurations with fast gate drivers.

Can STWA12N120K5 replace STW12N120K5 without PCB changes?

Yes - STWA12N120K5 uses the identical TO-247 outline and pin assignment as STW12N120K5 (per Figure 25 and Table 10), allowing direct substitution. However, the longer leads increase creepage distance and may require minor rework of heatsink standoff height to maintain mechanical clearance.

Is the body diode suitable for synchronous rectification in LLC resonant converters?

No - the body diode's 630 ns reverse recovery time and 12.6 μC Q_rr at 25 °C (Table 7) generate excessive switching loss and voltage overshoot in synchronous rectification. It is qualified only for freewheeling and clamping roles; external SiC Schottky diodes are required for SR operation.