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
What are the key features of STF5N65M6?
- 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
What is STF5N65M6 used for?
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.
What are the specifications of STF5N65M6?
| 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 |
Where can I find the STF5N65M6 datasheet?
STF5N65M6 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for STF5N65M6?
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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