STK035N4S8AG - 40V N-Channel Power MOSFET | STMicroelectronics
MPN: STK035N4S8AG β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.72 | $720.00 |
Drop-in alternatives for STK035N4S8AG β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STL140N4LLF5
β Drop-Inπ Reference alternative (not in catalog)
STL120N4LLF5
β Drop-Inπ Reference alternative (not in catalog)
STK035N4S8AG Maximum Ratings & Electrical Characteristics
| Polarity | N-Channel |
| Drain-Source Voltage (VDS) | 40 V |
| Continuous Drain Current (ID) | 35 A |
| On-Resistance (RDS(on)) | 4.5 mOhm @ VGS=10V |
| Gate-Source Voltage (VGS) | Β±20 V |
| Total Gate Charge (Qg) | 30 nC |
| Rise Time | 15 ns |
| Fall Time | 20 ns |
| Power Dissipation (PD) | 100 W |
| Operating Temperature Range | -55C to +175C |
| Package | PowerFLAT 5x6 |
| Mounting Type | Surface Mount |
| AEC-Q101 Qualified | Yes |
| RoHS Compliant | Yes |
| Thermal Resistance (Junction-to-Case) | 1.2 C/W |
STK035N4S8AG Pin Configuration
| Pin 1 | G β Gate |
| Pin 2 | S β Source |
| Pin 3 | S β Source |
| Pin 4 | D β Drain |
| Pin 5 | D β Drain |
| Pin 6 | D β Drain |
| Pin 7 | D β Drain |
| Pin 8 | D β Drain |
Safe Operating Area
Typical Applications
STK035N4S8AG is suitable for 6 applications: Automotive Body Control Module, DC-DC Converter, Motor Control, Load Switching, Battery Management System, Power Supply Unit.
Automotive Body Control Module
The STK035N4S8AG is ideal for automotive body control modules due to its AEC-Q101 qualification and low on-resistance. It can switch loads such as lights, motors, and solenoids efficiently. In a typical body control module, the MOSFET is used as a high-side or low-side switch, controlled by a microcontroller. The low RDS(on) minimizes power dissipation, reducing heat generation in the module. The fast switching speed allows for PWM control of loads, enabling dimming or speed control. The PowerFLAT 5x6 package's exposed pad aids in thermal management, ensuring reliable operation in the engine compartment's high-temperature environment.
Recommended
DC-DC Converter
In DC-DC converters, the STK035N4S8AG serves as a synchronous rectifier or main switch. Its low on-resistance (4.5 mOhm) reduces conduction losses, while the low gate charge (30nC) enables high-frequency operation, shrinking the size of magnetic components. The MOSFET's fast switching speed minimizes switching losses, improving overall converter efficiency. In a typical buck converter, the STK035N4S8AG is used in the high-side position, with a complementary low-side MOSFET. The device's thermal resistance of 1.2 C/W allows it to dissipate heat effectively, even in compact designs. The wide operating temperature range ensures reliable operation in industrial environments.
Recommended
Motor Control
The STK035N4S8AG is well-suited for motor control applications, such as brushless DC (BLDC) motor drives. Its high current rating (35A) and low on-resistance enable efficient power delivery to the motor windings. The fast switching speed allows for high-frequency PWM, reducing audible noise and improving control precision. In a typical BLDC motor controller, three half-bridges are used, each with a high-side and low-side MOSFET. The STK035N4S8AG can be used in both positions, providing a compact and efficient solution. The AEC-Q101 qualification makes it suitable for automotive applications like electric power steering and cooling fans.
Recommended
Load Switching
The STK035N4S8AG is an excellent choice for general load switching in industrial and consumer applications. Its low on-resistance ensures minimal voltage drop across the switch, reducing power loss. The device can handle inrush currents and short-circuit conditions due to its robust design. In a typical load switch circuit, the MOSFET is controlled by a logic signal, with a pull-down resistor to ensure it is off by default. The PowerFLAT 5x6 package's small footprint saves board space, while the exposed pad aids in heat dissipation. The wide input voltage range makes it compatible with various supply rails.
Recommended
Battery Management System
In battery management systems (BMS), the STK035N4S8AG is used for cell balancing and protection. Its low on-resistance minimizes energy loss during balancing, improving system efficiency. The high current rating allows it to handle the high currents during charging and discharging. The AEC-Q101 qualification ensures reliability in automotive battery packs. In a typical BMS, the MOSFET is used in series with each cell to enable balancing, controlled by a battery management IC. The device's fast switching speed enables precise control, while the thermal performance ensures safe operation under high current conditions.
Recommended
Power Supply Unit
The STK035N4S8AG is used in power supply units (PSUs) for servers, telecom, and industrial equipment. Its low on-resistance and fast switching speed improve efficiency, reducing energy consumption and heat generation. The device can operate at high frequencies, allowing for smaller transformers and inductors, reducing the overall size of the PSU. In a typical switch-mode power supply, the MOSFET is used in the primary side as a switch, with a PWM controller. The PowerFLAT 5x6 package's thermal performance ensures reliable operation even at high power levels. The wide operating temperature range makes it suitable for harsh environments.
Recommended
Recommended Products Summary
Engineering reference data for STK035N4S8AG β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STL140N4LLF5 | STL120N4LLF5 | IPB035N04N | NTMFS4833N |
|---|---|---|---|---|---|
| Package | PowerFLAT 5x6 | PowerFLAT 5x6 | PowerFLAT 5x6 | D2PAK | SO-8FL |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon | onsemi |
| Drain-Source Voltage (VDS) | 40 V | 40 V | 40 V | 40 V | 30 V |
| Continuous Drain Current (ID) | 35 A | 40 A | 30 A | 35 A | 30 A |
| On-Resistance (RDS(on)) | 4.5 mOhm | 5.5 mOhm | 6.5 mOhm | 3.5 mOhm | 5.0 mOhm |
| Total Gate Charge (Qg) | 30 nC | 35 nC | 28 nC | 25 nC | 32 nC |
| AEC-Q101 Qualified | Yes | Yes | Yes | Yes | No |
| Price (1pc) | $1.25 | $1.30 | $1.10 | $1.40 | $1.20 |
Key Differentiators
- Lower on-resistance than STL140N4LLF5 (vs STL140N4LLF5)
- AEC-Q101 qualified (vs NTMFS4833N)
- Same package as STL140N4LLF5 (vs IPB035N04N)
Design Notes
The STK035N4S8AG has a junction-to-case thermal resistance of 1.2 C/W. For high-current applications, ensure adequate PCB copper area and thermal vias to dissipate heat. At 35A and 4.5 mOhm, power dissipation is approximately 5.5W, which can be managed with proper thermal design.
Place the gate driver as close to the MOSFET as possible to minimize gate loop inductance. Use a gate resistor (e.g., 10 ohm) to control switching speed and reduce EMI. Ensure the source connection is low-inductance to avoid voltage spikes during switching.
Do not exceed the maximum gate-source voltage of Β±20V. Use a zener diode or TVS for gate protection if the drive voltage can spike. Also, ensure the drain-source voltage does not exceed 40V, especially during inductive switching, to avoid avalanche breakdown.
Compliance Information
AEC-Q101 qualified per STMicroelectronics datasheet. RoHS compliant.
