STMicroelectronics STK822

Overview

STK822 from STMicroelectronics is an N-channel Power MOSFET in PolarPAK® package, rated for 25 V drain-source voltage, 38 A continuous drain current at 25 °C, and ultra-low R_DS(on) of 0.00175 Ω at V_GS = 10 V. It features double-side cooling, 100% R_g tested gate, and matte tin finish compliant with RoHS. It is designed for high-efficiency switching applications in DC-DC converters and motor control stages.

For engineers reviewing the STK822 datasheet, STK822 pinout, STK822 application, or STK822 equivalent, key selection criteria include its 0.8 °C/W top-side thermal resistance, 58 nC·mΩ gate charge figure-of-merit, avalanche energy rating of 500 mJ, and compatibility with 4.5 V logic-level drive in compact power stages.

Technical Context

This MOSFET employs ST's "single feature size" strip-based process to achieve high cell density and low on-resistance. Its PolarPAK® package enables simultaneous top- and bottom-side thermal dissipation, with junction-to-case (top drain) resistance as low as 0.8 °C/W and junction-to-source resistance of 2.2 °C/W under steady-state FR-4 mounting.

The device supports fast switching with turn-on delay of 30.7 ns and fall time of 13 ns under 4.7 Ω gate resistance, while maintaining robust unclamped inductive switching capability (E_AS = 500 mJ). Its body diode exhibits 41 ns reverse recovery time and 2.2 nC Q_rr at T_j = 150 °C, enabling efficient synchronous rectification.

Key Specifications

Pinout & Package

PolarPAK® is a dual-sided thermally enhanced surface-mount package with exposed top drain and source terminals on the bottom. The die is fully encapsulated with 100% matte tin finish per EU Directive 2002/95/EC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STL822 and IRF7470, STK822 delivers superior thermal performance (0.8 °C/W top-side R_th) and higher voltage margin (25 V), making it optimal for high-current, high-frequency industrial switching where board-level thermal management is constrained.

Availability

STK822 is available at Aetrix Electronics and suitable for DC-DC converters, BLDC motor drivers, hot-swap protection circuits, and industrial solenoid drivers requiring stable component supply and legacy design continuity.

Supply support for STK822 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 and discrete components for industrial, automotive, and consumer markets.

The STK822 belongs to ST's PolarPAK® Power MOSFET product line, engineered specifically for high-power-density switching applications where dual-side thermal extraction and ultra-low on-resistance are critical system requirements.

FAQ

Is STK822 suitable for 4.5 V logic-level gate drive?

Yes. STK822 specifies R_DS(on) = 0.0022 Ω at V_GS = 4.5 V and I_D = 19 A, confirming full enhancement with standard 4.5 V microcontroller outputs. Its gate threshold voltage range (1–2.5 V) ensures reliable turn-on without overdrive.

What is the maximum PCB copper area required for thermal compliance?

Per datasheet Table 3, STK822 achieves 5.2 W total dissipation on a 1 inch² FR-4 board with 2 oz Cu. For full 38 A continuous operation, ≥2 inch² of 2 oz Cu on both layers with thermal vias to internal planes is recommended to maintain T_j ≤ 125 °C.

Does STK822 have integrated ESD protection on the gate?

No. STK822 does not include on-die ESD protection structures. External gate protection-such as a 10 Ω series resistor and 12 V Zener clamp between gate and source-is required to prevent damage from human-body-model (HBM) discharges exceeding ±18 V.

Can STK822 replace older STP822 devices in existing designs?

No. STP822 is a TO-220 packaged 25 V MOSFET with R_DS(on) = 0.0035 Ω and different thermal and electrical characteristics. STK822's PolarPAK® footprint, lower R_DS(on), and dual-side cooling require PCB layout revision; it is not a drop-in replacement.