STMicroelectronics STD4N52K3

Overview

STD4N52K3 from STMicroelectronics is an N-channel 525 V, 2.6 Ω max, 2.5 A MDmesh™ K3 Power MOSFET in DPAK (TO-252) package, designed for high-voltage switching in offline SMPS, PFC stages, and industrial motor drives where avalanche ruggedness and low gate charge are critical.

For engineers reviewing the STD4N52K3 datasheet, STD4N52K3 pinout, STD4N52K3 application, or STD4N52K3 equivalent, key selection criteria include its 11 nC total gate charge, 12 V/ns dv/dt capability, 110 mJ single-pulse avalanche energy, and built-in Zener-protected gate-source structure for ESD robustness.

Technical Context

This device employs ST's MDmesh™ K3 vertical superjunction architecture optimized for high-voltage operation with reduced specific on-resistance and minimized output capacitance. Its 334 pF input capacitance and 5 pF reverse transfer capacitance enable fast, low-loss switching at 420 V bus voltages.

The integrated source-drain diode features 173 ns reverse recovery time and 778 nC reverse recovery charge at 25 °C, with improved softness due to optimized carrier lifetime control-critical for reducing EMI in hard-switched converters.

Key Specifications

Pinout & Package

DPAK (TO-252) package: surface-mount, 3-terminal, exposed drain tab for thermal and electrical connection; requires minimum 1 inch² FR-4 PCB copper area for R_thj-pcb = 50 °C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP4N52K3 and STU4N52K3, STD4N52K3 offers superior thermal performance in compact SMT layouts due to its DPAK tape-and-reel packaging, lower R_thj-amb, and compatibility with automated pick-and-place-making it optimal for high-density power supply PCBs.

Availability

STD4N52K3 is available at Aetrix Electronics and suitable for AC-DC power supplies, industrial motor drives, and LED driver circuits requiring stable component supply across extended product lifecycles.

Supply support for STD4N52K3 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

STD4N52K3 belongs to the MDmesh™ K3 Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in 400–600 V applications such as server PSUs, solar inverters, and industrial automation systems.

FAQ

What is the maximum continuous drain current for STD4N52K3 at 100 °C case temperature?

The maximum continuous drain current is 2 A at T_C = 100 °C, as specified in Table 1 of DS7026 Rev 3. This derating reflects thermal limits of the DPAK package under sustained high-temperature operation and must be applied in thermal design calculations for enclosed or high-ambient environments.

Does STD4N52K3 include integrated gate protection?

Yes-STD4N52K3 integrates back-to-back Zener diodes between gate and source with a 30 V breakdown voltage (V_(BR)GSO), providing inherent ESD protection and eliminating the need for external gate clamping components in most standard industrial applications.

Can STD4N52K3 replace older MDmesh™ K2 devices in existing designs?

Yes-STD4N52K3 is a direct drop-in replacement for ST's MDmesh™ K2 series (e.g., STD4N52K2) with identical pinout, package, and voltage rating, but delivers lower R_DS(on) (2.6 Ω vs 3.0 Ω typ.), reduced Q_g, and improved dv/dt immunity-enabling efficiency gains without layout changes.

What is the safe operating area (SOA) limitation for pulsed operation at 100 µs duration?

At 100 µs pulse width and T_C = 25 °C, the SOA is limited by R_DS(on) to approximately 1.2 A at 400 V, as shown in Figure 1 of DS7026 Rev 3. This limit assumes no second breakdown and accounts for junction temperature rise during the pulse.