STMicroelectronics STD7N52K3

Overview

STD7N52K3 from STMicroelectronics is an N-channel 525 V, 730 mΩ typ. (850 mΩ max.), 6 A MDmesh K3 Power MOSFET in DPAK (TO-252) package, optimized for high-voltage switching in offline SMPS, PFC stages, and industrial inverters with demanding avalanche and dv/dt requirements.

For engineers reviewing the STD7N52K3 datasheet, STD7N52K3 pinout, STD7N52K3 application, or STD7N52K3 equivalent, key selection criteria include its 110 mJ single-pulse avalanche energy, 12 V/ns diode recovery dv/dt capability, low 870 pF input capacitance, and Zener-protected gate-critical for robustness in flyback, resonant, and hard-switched topologies.

Technical Context

This device employs ST's MDmesh K3 vertical structure with enhanced charge balancing, delivering ultra-low R_DS(on) × Q_g figure-of-merit (≈28 nC·Ω) and reduced C_oss eq. (53 pF) for improved efficiency in 65–300 kHz switching applications. Its Zener-protected gate withstands ±30 V transient stress without external clamping.

The integrated body diode features fast reverse recovery (t_rr = 220 ns @ 100 A/µs, 60 V) and low Q_rr (1.8 µC), minimizing commutation losses in bridge-leg and synchronous rectification configurations where diode softness and EMI control are critical.

Key Specifications

Pinout & Package

DPAK (TO-252) package with exposed drain tab for thermal and electrical connection; thermally enhanced plastic surface-mount outline compliant with JEDEC TO-252-3 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP7N52K3, STD7N52K3 offers superior thermal performance in space-constrained layouts via DPAK's low R_thJC; versus IPP65R099C7, it provides integrated diode functionality and simpler gate drive at the expense of higher conduction loss and frequency ceiling.

Availability

STD7N52K3 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial PFC modules, LED drivers, and solar microinverters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STD7N52K3 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 for automotive, industrial, and power applications.

STD7N52K3 belongs to the MDmesh K3 family-engineered specifically for high-voltage, high-efficiency switching in offline power conversion, emphasizing avalanche ruggedness, dynamic performance, and thermal reliability.

FAQ

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

The STD7N52K3 supports 3.8 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS5889 Rev 7. This derating reflects thermal limits of the DPAK package and ensures safe operation within SOA boundaries under sustained high-temperature conditions.

Does this MOSFET require an external gate resistor for stability?

Yes-a gate resistor (typically 4.7 Ω) is recommended to dampen oscillation and control switching speed, as validated in the datasheet's resistive load test circuit (Figure 14). The intrinsic gate resistance is 3.5 Ω, so external series resistance fine-tunes dV/dt and EMI behavior.

Can STD7N52K3 replace STD5N52K3 in existing designs?

No-STD5N52K3 has lower R_DS(on) (650 mΩ max.) and higher ID (7 A), but shares identical V_DS and package. Substitution requires verification of SOA, thermal margin, and gate drive capability due to differing Q_g (28 nC vs. 33 nC) and avalanche energy (125 mJ vs. 110 mJ).

Is the body diode suitable for synchronous rectification?

The body diode exhibits fast recovery (t_rr = 220 ns) and low Q_rr (1.8 µC), making it usable in low-frequency synchronous rectification (≤100 kHz); however, its forward voltage (1.6 V) is higher than discrete Schottky diodes, limiting efficiency gains in high-current, low-V_OUT applications.