STB80NF55-08AG - 55V 80A Automotive N-Channel MOSFET | STMicroelectronics
MPN: STB80NF55-08AG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.89 | $445.00 |
| 1,000 | $0.81 | $810.00 |
Drop-in alternatives for STB80NF55-08AG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STB80NF55-06T4
✅ Drop-In✓ 99,999 In Stock
$1.38 / Unit
View Datasheet →STB80NF55L-06T4
✅ Drop-In📋 Reference alternative (not in catalog)
VBL1606
✅ Drop-In📋 Reference alternative (not in catalog)
STB80NF55-08AG Maximum Ratings & Electrical Characteristics
| Polarity | N-Channel |
| Drain-to-Source Voltage (VDS) | 55 V |
| Continuous Drain Current (ID) | 80 A (Tc) |
| On-Resistance (RDS(on)) | 6.5 mΩ typ |
| Power Dissipation (PD) | 300 W (Tc) |
| Gate Charge (Qg) | [DATA_NEEDED: gate charge value] |
| Input Capacitance (Ciss) | [DATA_NEEDED: input capacitance value] |
| Gate Threshold Voltage (VGS(th)) | [DATA_NEEDED: gate threshold voltage value] |
| Avalanche Energy (EAS) | 100% avalanche tested |
| Operating Temperature Range | -55°C to +175°C |
| Package | D2PAK (TO-263) |
| Mounting Type | Surface Mount |
| Automotive Grade | AEC-Q101 qualified |
| RoHS Status | Compliant |
| Technology | STripFET |
STB80NF55-08AG Pin Configuration
| Pin 1 | Gate (G) — Gate terminal for controlling the MOSFET |
| Pin 2 | Drain (D) — Drain terminal, connected to the tab |
| Pin 3 | Source (S) — Source terminal |
Safe Operating Area
Typical Applications
STB80NF55-08AG is suitable for 6 applications: Automotive Engine Control Units (ECUs), DC-DC Converters, Motor Control, Battery Management Systems (BMS), Telecom Power Supplies, Industrial Power Supplies.
Automotive Engine Control Units (ECUs)
The STB80NF55-08AG is ideal for automotive ECUs due to its AEC-Q101 qualification and low on-resistance. In an ECU, it is used as a high-side or low-side switch for controlling actuators, solenoids, and relays. The device's 55V rating provides ample headroom for automotive load-dump transients, while its 80A current capability handles high inrush currents. The low RDS(on) of 6.5 mΩ minimizes conduction losses, improving overall system efficiency and reducing heat generation. The D2PAK package allows for efficient heat dissipation through the PCB copper pour, ensuring reliable operation in the harsh under-hood environment. The fast switching speed, enabled by the STripFET process, reduces switching losses and allows for higher PWM frequencies, which is beneficial for precise control of actuators. Additionally, the 100% avalanche testing ensures robustness against inductive load switching, a common scenario in automotive applications. The wide operating temperature range of -55°C to +175°C ensures functionality in extreme climates. Overall, the STB80NF55-08AG provides the reliability and performance required for critical automotive control systems.
Recommended
DC-DC Converters
The STB80NF55-08AG is well-suited for DC-DC converters, particularly in isolated topologies like forward and full-bridge converters. Its low gate charge and input capacitance, resulting from the STripFET process, enable high-frequency switching, which reduces the size of magnetic components and improves power density. The low on-resistance of 6.5 mΩ minimizes conduction losses, which is critical for achieving high efficiency in power conversion. In a typical synchronous buck converter, the STB80NF55-08AG can be used as the high-side switch, where its fast switching speed reduces transition losses. The device's 55V rating is suitable for 12V and 24V input systems, providing adequate margin for voltage spikes. The 80A current rating allows for high output currents, making it suitable for server power supplies and telecom rectifiers. The D2PAK package's low thermal resistance enables efficient heat transfer to the PCB, allowing for continuous operation at high power levels. The 100% avalanche testing ensures the device can withstand energy from inductive loads, which is important in converter applications. Overall, the STB80NF55-08AG offers a balance of low losses and high reliability, making it a preferred choice for high-efficiency DC-DC converters.
Recommended
Motor Control
The STB80NF55-08AG is an excellent choice for motor control applications, including brushless DC (BLDC) motors and brushed DC motors. In a three-phase BLDC motor drive, the MOSFET is used in the inverter stage to switch the motor windings. The device's low on-resistance reduces conduction losses, which is essential for maximizing motor efficiency and extending battery life in electric vehicles. The fast switching speed, enabled by the low gate charge, allows for high PWM frequencies, resulting in smoother motor operation and reduced acoustic noise. The 55V rating is suitable for 12V, 24V, and 48V motor systems, providing adequate voltage margin. The 80A current capability handles the high peak currents during motor startup and stall conditions. The D2PAK package's thermal performance ensures the MOSFET can dissipate heat generated during continuous operation, preventing thermal shutdown. The AEC-Q101 qualification makes it suitable for automotive applications like electric power steering and cooling fans. The 100% avalanche testing ensures robustness against inductive spikes generated by the motor windings. Overall, the STB80NF55-08AG provides the performance and reliability needed for efficient and durable motor control systems.
Recommended
Battery Management Systems (BMS)
The STB80NF55-08AG is well-suited for battery management systems (BMS) in electric vehicles and energy storage systems. In a BMS, the MOSFET is used for cell balancing, charge/discharge control, and protection circuits. The device's low on-resistance minimizes power loss during high-current charging and discharging, improving overall system efficiency. The 55V rating is suitable for battery packs with nominal voltages up to 48V, providing adequate margin for voltage transients. The 80A current capability allows for high charge/discharge rates, which is essential for fast charging and high-power applications. The AEC-Q101 qualification ensures reliability in automotive BMS applications, where the device may be exposed to vibration, temperature extremes, and electrical stress. The D2PAK package's thermal performance allows for efficient heat dissipation, preventing overheating during high-current operation. The 100% avalanche testing ensures the MOSFET can handle inductive spikes from the battery and load. The fast switching speed enables efficient PWM control for cell balancing, reducing energy loss. Overall, the STB80NF55-08AG provides the robustness and efficiency required for modern BMS designs.
Recommended
Telecom Power Supplies
The STB80NF55-08AG is an ideal choice for telecom power supplies, where high efficiency and reliability are paramount. In a typical isolated DC-DC converter for telecom applications, the MOSFET is used as the primary switch. The device's low on-resistance and low gate charge, resulting from the STripFET process, enable high-frequency switching, which reduces the size of transformers and inductors, saving PCB space and cost. The 55V rating is suitable for 48V telecom bus systems, providing adequate margin for voltage spikes. The 80A current capability allows for high output power, making it suitable for rectifiers and power modules. The D2PAK package's thermal performance ensures efficient heat dissipation, allowing for continuous operation at high power levels. The 100% avalanche testing ensures the device can withstand energy from the transformer's leakage inductance, which is critical for reliable operation. The low input capacitance reduces gate drive requirements, simplifying the gate drive circuit. Overall, the STB80NF55-08AG offers the performance and reliability needed for high-efficiency telecom power supplies.
Recommended
Industrial Power Supplies
The STB80NF55-08AG is well-suited for industrial power supplies, including AC-DC converters and DC-DC converters. In an AC-DC converter, the MOSFET is used in the power factor correction (PFC) stage and the main switching stage. The device's low on-resistance minimizes conduction losses, improving overall efficiency and reducing heat generation. The 55V rating is suitable for 24V and 48V industrial bus systems, providing adequate margin for voltage transients. The 80A current capability allows for high output power, making it suitable for industrial equipment like motor drives, welding machines, and CNC machines. The D2PAK package's thermal performance ensures efficient heat dissipation, allowing for continuous operation in harsh industrial environments. The 100% avalanche testing ensures robustness against inductive spikes from motors and transformers. The fast switching speed enables high-frequency operation, reducing the size of magnetic components and improving power density. The device's wide operating temperature range of -55°C to +175°C ensures reliable operation in extreme conditions. Overall, the STB80NF55-08AG provides the performance and reliability required for demanding industrial power supply applications.
Recommended
Recommended Products Summary
Engineering reference data for STB80NF55-08AG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STB80NF55-06T4 | STB80NF55L-06T4 | STP80NF55-08 | STW80NF55-08 | VBL1606 |
|---|---|---|---|---|---|---|
| Package | D2PAK (TO-263) | D2PAK (TO-263) - same | D2PAK (TO-263) - same | TO-220 - different | TO-247 - different | D2PAK (TO-263) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | VBsemi |
| Drain-to-Source Voltage (VDS) | 55 V | 55 V | 55 V | 55 V | 55 V | [DATA_NEEDED] |
| Continuous Drain Current (ID) | 80 A | 80 A | 80 A | 80 A | 80 A | [DATA_NEEDED] |
| On-Resistance (RDS(on)) | 6.5 mΩ typ | 6.0 mΩ typ | 6.0 mΩ typ | 6.5 mΩ typ | 6.5 mΩ typ | [DATA_NEEDED] |
| Power Dissipation (PD) | 300 W | 300 W | 300 W | 300 W | 300 W | [DATA_NEEDED] |
| Automotive Grade | AEC-Q101 qualified | No | No | No | No | [DATA_NEEDED] |
| Technology | STripFET | STripFET | STripFET | STripFET | STripFET | [DATA_NEEDED] |
Key Differentiators
- Automotive-grade AEC-Q101 qualification (vs STB80NF55-06T4)
- Low on-resistance of 6.5 mΩ (vs VBL1606)
- STripFET process for low gate charge (vs STB80NF55L-06T4)
Design Notes
The STB80NF55-08AG has a maximum power dissipation of 300W at Tc=25°C. In a typical application with VDS=12V and ID=40A, the conduction loss is I²R = 40² × 0.0065 = 10.4W. The D2PAK package has a junction-to-case thermal resistance of approximately 0.5°C/W (typical for this package). To keep the junction temperature below 175°C, the case temperature must be kept below 175 - (10.4 × 0.5) = 169.8°C. This requires a heatsink or a large copper area on the PCB. For continuous operation at high current, ensure adequate thermal management to prevent thermal runaway.
For optimal performance, place the STB80NF55-08AG on a PCB with a large copper pour connected to the drain tab. The D2PAK package's tab is the drain terminal, so the copper area serves as a heatsink. Use multiple vias to connect the top and bottom copper layers for improved heat dissipation. Keep the gate drive trace short and direct to minimize inductance, which can cause ringing and oscillation. Place a gate resistor (typically 10Ω) close to the gate pin to dampen oscillations. Ensure the source connection is low-inductance to reduce voltage spikes during switching.
One common pitfall is exceeding the maximum gate-source voltage (VGS) rating, which is typically ±20V for this device. Use a gate driver with proper voltage clamping to prevent overvoltage. Another pitfall is inadequate gate drive voltage, which can cause the MOSFET to operate in the linear region, leading to excessive power dissipation and potential failure. Ensure the gate drive voltage is at least 10V to fully enhance the channel. Additionally, be aware of the device's avalanche energy rating; while it is 100% avalanche tested, repeated avalanche events can degrade the device. Design the circuit to minimize inductive spikes.
Compliance Information
RoHS compliant per STMicroelectronics product page. AEC-Q101 qualified for automotive applications.
