STF5N65M6 STMicroelectronics MOSFET (N-Channel) (Transistor Outline, Vertical) In Stock
STF5N65M6 is an N-channel power MOSFET from STMicroelectronics rated at 650 V drain-to-source voltage and 5 A continuous drain current, designed for high-voltage switching in energy-efficient power conversion systems. It features low on-state resistance for reduced conduction losses and is housed in a TO-220FP vertical through-hole package for effective thermal management. Suitable for PFC stages, flyback converters, and motor drive applications in industrial and consumer power supplies.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- STF5N65M6 Datasheet PDF
- Category
- MOSFET (N-Channel)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 650 V VDSS rating enables use in offline AC-DC flyback, LLC, and PFC converter topologies up to 400 V DC bus
- 5 A continuous drain current with low RDS(on) minimizes conduction losses in switching power supply designs
- TO-220FP vertical through-hole package provides low thermal resistance with heatsink attachment capability
- N-channel enhancement mode with fast switching for high-frequency power conversion above 100 kHz
Applications
STF5N65M6 is designed for high-voltage power conversion circuits including flyback SMPS, PFC boost converters, and LLC resonant half-bridge stages in AC-DC adapters, LED driver power supplies, and industrial equipment rated from 85 VAC to 265 VAC universal input. Its 650 V rating provides the safety margin needed above the 400 V DC bus that results from rectifying 230 VAC mains. The device also serves as the main switch in motor-drive inverter stages for small single-phase induction and BLDC motors in home appliances and HVAC fan control units.
Specifications
| YTEOL | 0 |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What drain-to-source voltage and current ratings make STF5N65M6 appropriate for universal input AC-DC power supplies?
STF5N65M6 is rated at 650 V VDSS and 5 A continuous drain current. In a universal input flyback SMPS running from 85 VAC to 265 VAC, the rectified DC bus reaches approximately 375 V at 265 VAC input, and drain voltage spikes can add 100 V to 200 V during turn-off. The 650 V rating provides a 75 V to 175 V safety margin above these peak voltages, which is standard practice for offline SMPS MOSFET selection.
For a 100 kHz flyback converter switching 400 V DC bus, how does STF5N65M6's switching speed affect power losses?
STF5N65M6's fast-switching N-channel enhancement-mode structure is optimized for operation above 100 kHz with low gate charge and short turn-on and turn-off transition times, typically under 50 ns. Faster transitions reduce switching losses that scale with frequency, current, and voltage — critical at 400 V bus where each nanosecond of transition time contributes millijoules of loss per switching event. At 100 kHz this translates to measurable efficiency gains compared to slower general-purpose MOSFETs.
What thermal management considerations apply to STF5N65M6 in a 50 W SMPS design?
The TO-220FP package of STF5N65M6 has a typical junction-to-case thermal resistance of approximately 2°C/W to 3°C/W. In a 50 W flyback converter with 5% total MOSFET power loss (2.5 W), a small heatsink with 10°C/W to 20°C/W thermal resistance keeps junction temperature below 85°C at 25°C ambient — well within the 150°C to 175°C maximum junction rating. For convection-cooled designs, the full-pack TO-220FP lead frame enables direct heatsink mounting with standard M3 hardware.
Is STF5N65M6 suitable for driving a small 3-phase BLDC motor inverter in a home appliance fan?
Yes. A 3-phase BLDC inverter for a 100 W to 200 W home appliance fan motor uses 6 MOSFETs switching a 300 V to 400 V DC bus at 10 kHz to 20 kHz PWM frequency. STF5N65M6's 650 V VDSS and 5 A rating comfortably handles the bus voltage and the 1 A to 3 A phase currents typical in small fan motors, while its low RDS(on) keeps conduction losses below 1 W per device at these current levels, maintaining overall inverter efficiency above 90%.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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