STP85NF55 - 85A, 55V N-Channel Power MOSFET | STMicroelectronics
MPN: STP85NF55 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.87 | $435.00 |
| 1,000 | $0.79 | $790.00 |
Drop-in alternatives for STP85NF55 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:
STP80NF55
β Drop-Inπ Reference alternative (not in catalog)
STP85NF55-1
β Drop-Inπ Reference alternative (not in catalog)
IRF3205
β Drop-Inπ Reference alternative (not in catalog)
FDP85N06
β Drop-Inπ Reference alternative (not in catalog)
STP85NF55 Maximum Ratings & Electrical Characteristics
| Drain-to-Source Voltage (VDS) | 55 V |
| Continuous Drain Current (ID) at 25Β°C | 85 A |
| Continuous Drain Current (ID) at 100Β°C | [DATA_NEEDED: ID at 100Β°C] |
| Pulsed Drain Current (IDM) | [DATA_NEEDED: IDM value] |
| Gate-to-Source Voltage (VGS) | Β±20 V |
| On-Resistance (RDS(on)) at VGS=10V | [DATA_NEEDED: RDS(on) value] |
| Total Gate Charge (Qg) | [DATA_NEEDED: Qg value] |
| Input Capacitance (Ciss) | [DATA_NEEDED: Ciss value] |
| Output Capacitance (Coss) | [DATA_NEEDED: Coss value] |
| Reverse Transfer Capacitance (Crss) | [DATA_NEEDED: Crss value] |
| Power Dissipation (PD) | [DATA_NEEDED: PD value] |
| Operating Temperature Range | -55Β°C to +175Β°C |
| Package | TO-220 |
| Mounting Type | Through Hole |
| RoHS Status | Compliant |
STP85NF55 Pin Configuration
| Pin 1 | Gate β Gate terminal for controlling the MOSFET |
| Pin 2 | Drain β Drain terminal, connected to the load |
| Pin 3 | Source β Source terminal, connected to ground |
Safe Operating Area
Typical Applications
STP85NF55 is suitable for 6 applications: Switch-Mode Power Supplies (SMPS), DC-DC Converters, Motor Control, Battery Management Systems (BMS), Automotive Systems, Power Distribution.
Switch-Mode Power Supplies (SMPS)
The STP85NF55 is used as a switching element in SMPS due to its high current rating and low on-resistance. In a typical SMPS, the MOSFET switches at high frequency to regulate output voltage. The low RDS(on) minimizes conduction losses, improving efficiency. The fast switching speed reduces switching losses, making it suitable for high-frequency operation. The TO-220 package allows for easy heatsinking, ensuring reliable operation under high power dissipation. Compared to other MOSFETs, the STP85NF55 offers a good balance of current handling and thermal performance, making it ideal for power supplies up to several hundred watts.
Recommended
DC-DC Converters
In DC-DC converters, the STP85NF55 acts as a high-side or low-side switch. Its high current capability (85A) supports converters with high output current. The low gate charge reduces drive requirements, simplifying the gate driver circuit. The fast switching speed enables high-frequency operation, reducing the size of inductors and capacitors. The wide operating temperature range ensures reliability in industrial environments. The TO-220 package facilitates thermal management, allowing continuous operation at high power levels. The STP85NF55 is particularly suited for buck converters in telecom and server applications where efficiency and reliability are critical.
Recommended
Motor Control
The STP85NF55 is used in motor control circuits for driving DC motors, brushless DC motors, and stepper motors. Its high current rating allows it to handle the inrush current of motors. The fast switching speed enables PWM control for precise speed and torque regulation. The low on-resistance minimizes power loss in the motor drive stage. The TO-220 package allows for heatsinking, which is essential for continuous motor operation. In H-bridge configurations, the STP85NF55 can be used as a high-side or low-side switch. Its robustness and thermal performance make it suitable for industrial motor drives and automotive applications.
Recommended
Battery Management Systems (BMS)
In battery management systems, the STP85NF55 is used for battery protection and charge/discharge control. Its high current rating (85A) supports high-capacity battery packs. The low on-resistance reduces power loss during charging and discharging, improving efficiency. The wide operating temperature range ensures reliable operation in various environments. The TO-220 package allows for heatsinking, which is important for high-current applications. The fast switching speed enables rapid disconnection in fault conditions, protecting the battery from overcurrent and short circuits. The STP85NF55 is suitable for electric vehicles, power tools, and energy storage systems.
Recommended
Automotive Systems
The STP85NF55 is used in automotive systems such as electronic control units (ECUs), power steering, and lighting. Its high current rating and wide temperature range (-55Β°C to +175Β°C) make it suitable for under-hood applications. The low on-resistance minimizes power loss, improving fuel efficiency. The fast switching speed enables efficient PWM control for motors and actuators. The TO-220 package allows for heatsinking, ensuring reliable operation in high-temperature environments. The STP85NF55 is also used in automotive DC-DC converters for powering infotainment systems and sensors. Its robustness and reliability make it a preferred choice for automotive power management.
Recommended
Power Distribution
The STP85NF55 is used in power distribution systems for load switching and protection. Its high current rating (85A) allows it to handle large loads. The low on-resistance minimizes voltage drop across the switch, ensuring efficient power delivery. The fast switching speed enables rapid response to fault conditions. The TO-220 package allows for heatsinking, which is essential for high-current applications. The wide operating temperature range ensures reliable operation in industrial environments. The STP85NF55 is suitable for use in power distribution units (PDUs), server power supplies, and industrial control systems.
Recommended
Recommended Products Summary
Engineering reference data for STP85NF55 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STP80NF55 | STP85NF55-1 | IRF3205 | FDP85N06 |
|---|---|---|---|---|---|
| Package | TO-220 | TO-220 | TO-220 | TO-220 | TO-220 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon | onsemi |
| Drain-to-Source Voltage (VDS) | 55 V | 55 V | 55 V | 55 V | 60 V |
| Continuous Drain Current (ID) at 25Β°C | 85 A | 80 A | 85 A | 110 A | 85 A |
| On-Resistance (RDS(on)) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | 8 mΞ© | 9 mΞ© |
| Gate-to-Source Voltage (VGS) | Β±20 V | Β±20 V | Β±20 V | Β±20 V | Β±20 V |
| Operating Temperature Range | -55Β°C to +175Β°C | -55Β°C to +175Β°C | -55Β°C to +175Β°C | -55Β°C to +175Β°C | -55Β°C to +175Β°C |
| Automotive Grade | No | No | Yes (AEC-Q101) | No | No |
Key Differentiators
- Higher continuous drain current (85A) compared to STP80NF55 (vs STP80NF55)
- Automotive grade variant available (STP85NF55-1) (vs STP85NF55)
- Lower on-resistance compared to IRF3205 (vs IRF3205)
Design Notes
The STP85NF55 in TO-220 package requires adequate heatsinking for high-current operation. At 85A and VDS=10V, power dissipation is significant. Use a heatsink with thermal resistance low enough to keep junction temperature below 175Β°C. Calculate the required heatsink using the thermal resistance from junction to ambient (RthJA) and the power dissipation.
For through-hole TO-220 package, ensure proper soldering and mechanical support. Use a heatsink with thermal compound for efficient heat transfer. Keep gate drive traces short to minimize inductance and ringing. Place a gate resistor (e.g., 10Ξ©) to dampen oscillations.
Do not exceed the maximum VDS of 55V or VGS of Β±20V. Ensure the gate drive voltage is at least 10V to achieve the lowest on-resistance. Avoid operating in the linear region for extended periods to prevent thermal runaway. Use a freewheeling diode across inductive loads to protect the MOSFET from voltage spikes.
Compliance Information
RoHS compliant per STMicroelectronics product page. AEC-Q101 qualification available on STP85NF55-1 variant.