STMicroelectronics STP4N52K3

Overview

STP4N52K3 from STMicroelectronics is an N-channel 525 V, 2.5 A MDmesh™ K3 Power MOSFET in TO-220 package, optimized for high-voltage switching with 2.6 Ω max R_DS(on), 12 V/ns dv/dt capability, and built-in Zener gate protection. It delivers robust avalanche performance (110 mJ E_AS) and low output capacitance (28 pF C_oss) for SMPS and PFC stages in industrial power supplies.

For engineers reviewing the STP4N52K3 datasheet, STP4N52K3 pinout, STP4N52K3 application, or STP4N52K3 equivalent, key selection criteria include its 525 V V_DS, 2.6 Ω R_DS(on) at 10 V_GS, 10 A pulsed drain current, 45 W power dissipation, and Zener-protected gate structure - all critical for reliable high-voltage flyback and resonant converter designs.

Technical Context

This MDmesh™ K3 device employs a vertically optimized silicon structure to achieve ultra-low on-resistance while maintaining high voltage blocking and fast switching dynamics. Its 334 pF C_iss and 5 pF C_rss enable efficient high-frequency operation up to several hundred kHz in hard-switched topologies.

The integrated source-drain diode features 173 ns trr and 778 nC Q_rr at 25 °C, with improved reverse recovery characteristics versus prior MDmesh generations. The ±30 V gate-source rating and 30 V Zener breakdown support robust gate drive design without external clamping.

Key Specifications

Pinout & Package

STP4N52K3 uses the standard TO-220 package (type A), with tab-connected drain for direct heatsink mounting and thermal resistance of 2.78 °C/W junction-to-case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP5N52K3, STP4N52K3 offers tighter current rating control and lower gate charge (11 nC vs 13 nC), reducing drive loss in high-frequency PFC; versus FQP4N50, it provides verified 525 V blocking, integrated gate protection, and documented 110 mJ avalanche energy - essential for industrial reliability.

Availability

STP4N52K3 is available at Aetrix Electronics and suitable for industrial power supplies, LED drivers, and UPS inverters requiring stable component supply and long-term manufacturing continuity.

Supply support for STP4N52K3 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.

STP4N52K3 belongs to the MDmesh™ K3 family - engineered specifically for high-efficiency, high-voltage switching applications including SMPS, PFC, and lighting ballasts where low R_DS(on), fast switching, and avalanche ruggedness are critical.

FAQ

Is STP4N52K3 suitable for 230 V AC input PFC applications?

Yes. With 525 V V_DS, it provides 30% margin above the 400 V DC bus typical in universal-input PFC stages. Its 2.6 Ω R_DS(on), 11 nC Q_g, and 28 pF C_oss support efficient operation at 65–100 kHz in continuous conduction mode (CCM) and critical conduction mode (CrM) topologies.

Does STP4N52K3 require external gate protection?

No. It integrates back-to-back Zener diodes with 30 V breakdown (V_(BR)GSO) between gate and source, eliminating the need for external gate clamps in standard 10–15 V gate drive designs. This reduces BOM count and improves layout simplicity.

What is the maximum safe operating temperature for continuous operation?

The junction temperature must not exceed 150 °C. At T_C = 100 °C, the continuous drain current is derated to 2.0 A. With TO-220's 2.78 °C/W R_thj-case, a 45 W P_TOT rating allows ~16 W dissipation at 100 °C case temperature - requiring appropriate heatsinking for full 2.5 A operation.

How does STP4N52K3 compare to earlier MDmesh generations in diode performance?

It features improved source-drain diode characteristics: trr = 173 ns and Q_rr = 778 nC at 25 °C - 15–20% faster recovery and 25% lower charge than MDmesh K2 equivalents. This reduces commutation loss and EMI in quasi-resonant and LLC converters.