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STMicroelectronics STF17NF25
- Part No.:
- STF17NF25
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
STF17NF25.pdf
- Description:
- MOSFET N-CH 250V 17A TO220FP
- Quantity:
- Payment:
- Shipping:
Inventory:6,427
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Product details
Overview
STF17NF25 from STMicroelectronics is an N-channel 250V, 17A Power MOSFET in TO-220FP package, featuring RDS(on) ≤ 0.165 Ω at VGS = 10 V, 25 W total dissipation, and 100% avalanche tested for ruggedness. It serves as a primary switch in isolated DC-DC converters where low gate charge (29.5 nC) and high dv/dt immunity (10 V/ns) are critical.
For engineers reviewing the STF17NF25 datasheet, STF17NF25 pinout, STF17NF25 application, or STF17NF25 equivalent, this device is selected for high-efficiency power conversion requiring stable switching performance under repetitive unclamped inductive loads, thermal robustness up to 150°C junction temperature, and reliable source-drain diode recovery (trr = 157 ns at Tj = 25°C).
Technical Context
This STripFET™ II MOSFET employs a planar vertical structure optimized for reduced input capacitance (Ciss = 1000 pF) and minimized gate charge-enabling fast switching with low drive loss. Its SOA is defined for pulsed operation up to 68 A and supports hard-switched topologies without external snubbers.
The integrated body diode exhibits controlled reverse recovery (Qrr = 0.91 µC, IRRM = 11.6 A) and is rated for 17 A continuous conduction. Thermal resistance junction-to-case is 5 °C/W, enabling direct heatsink mounting without isolation washers in compact industrial SMPS designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 250 V - Withstands DC bus voltages up to 250 V in offline or intermediate bus converters |
| RDS(on) | ≤ 0.165 Ω - Limits conduction loss to ≤ 24 W at 17 A, enabling thermally constrained layouts |
| Qg | 29.5 nC - Reduces gate driver power demand and enables use of low-cost SOT-23 drivers |
| dv/dt Rating | 10 V/ns - Suppresses false turn-on during high-speed switching in noisy power stages |
| EAS | 100 mJ - Absorbs single-pulse inductive energy without failure in flyback or forward converters |
| TJ Max | 150 °C - Supports operation in sealed enclosures or high-ambient industrial environments |
| Coss | 178 pF - Enables ZVS-compatible resonant design when paired with appropriate external inductance |
Pinout & Package
STF17NF25 uses the TO-220FP (Full-Pak) package: insulated plastic case with integral heatsink tab, no metal tab isolation required. Mounting hole accommodates M3 screw; leads are tin-plated copper with lead-free finish per ECOPACK®.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Source) | Power return path for load current | Low-inductance connection point for PCB ground plane; ties directly to source of synchronous rectifier in secondary-side control |
| 2 (Gate) | Control terminal for channel modulation | High-impedance input requiring <100 nA leakage; sensitive to ESD-must be protected with TVS or RC filter |
| 3 (Drain) | Main high-voltage power terminal | Connected to transformer primary or bus rail; carries full switching voltage swing and must be routed with clearance ≥2.5 mm |
Key Features
| Feature | Design Value |
|---|---|
| STripFET™ II process | Reduces gate charge by 35% vs. standard planar MOSFETs-lowers driver IC cost and improves efficiency above 100 kHz |
| 100% avalanche tested | Guarantees single-pulse ruggedness to 100 mJ-eliminates need for external clamping in flyback snubberless designs |
| Low Coss/Crss ratio | 178 pF / 28 pF = 6.4 - Improves Miller immunity and enables stable operation with high-side gate drivers |
| ECOPACK® compliance | Lead-free second-level interconnect with JEDEC JESD97 marking-meets RoHS and REACH requirements for global OEM shipments |
| Enhanced dv/dt capability | 10 V/ns rating - Prevents parasitic turn-on in half-bridge configurations with fast-rising node voltages |
Applications
| AC-DC Adapter Primary Switch | Industrial DC-DC Isolated Converter |
|---|---|
Use Scenario: 65 W universal-input offline adapter powering IoT gateways with 12 V/5 A output. IC Role / Device Role / Timing Role: Main switch in quasi-resonant flyback topology operating at 65–130 kHz. Use Value: Low Qg reduces gate drive loss by 42% vs. legacy MOSFETs; 100 mJ EAS eliminates snubber capacitor. |
Use Scenario: 48 V to 12 V isolated converter in programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Primary-side switch in forward converter with synchronous rectification on secondary. Use Value: 5 °C/W Rth(j-c) allows direct heatsink mounting in confined 2U chassis; 150°C TJ rating ensures reliability at 70°C ambient. |
| LED Driver High-Side Switch | UPS Inverter Half-Bridge |
Use Scenario: Constant-current LED driver for street lighting with 300 V DC bus and PWM dimming. IC Role / Device Role / Timing Role: High-side switch controlling series-connected LED strings in buck-boost topology. Use Value: 10 V/ns dv/dt rating prevents false triggering during 100 kHz PWM edge transitions; 17 A ID supports 20 A peak LED surge. |
Use Scenario: 1 kVA online UPS inverter stage converting 360 V DC bus to 230 V AC output. IC Role / Device Role / Timing Role: Upper-leg switch in two-level inverter leg with bootstrap gate drive. Use Value: Controlled trr (157 ns) minimizes cross-conduction risk during dead-time; 68 A pulsed ID handles motor startup surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel 250V Power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP17NF25 | Same die, TO-220 package with non-insulated tab; Rth(j-c) = 1.38 °C/W; PTOT = 90 W | Requires insulating washer and thermal pad; suited for higher-power 90 W designs with active heatsinking | Select when thermal budget allows lower Rth and mechanical mounting permits tab isolation |
| IRF640NPbF | 200 V VDSS, RDS(on) = 0.18 Ω, Qg = 39 nC, no avalanche rating, TO-220 | Lacks 250 V margin and avalanche ruggedness; unsuitable for 230 VAC-derived 340 V bus designs | Only consider for lower-voltage (<200 V) DC-DC stages where cost is prioritized over reliability |
Compared with STF17NF25, STP17NF25 delivers superior thermal performance but requires electrical isolation, while IRF640NPbF trades voltage margin and ruggedness for legacy compatibility-making STF17NF25 optimal for space-constrained, 250 V-rated industrial SMPS where insulation and avalanche safety are mandatory.
Availability
STF17NF25 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial DC-DC converters, and LED driver systems requiring stable component supply across multi-year production cycles.
Supply support for STF17NF25 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and power applications.
This device belongs to the STripFET™ II Power MOSFET product line-engineered specifically for high-efficiency, high-reliability switching power supplies operating at frequencies up to 500 kHz.
FAQ
What is the maximum continuous drain current at 100°C case temperature?
The STF17NF25 supports 10 A continuous drain current at TC = 100°C, as specified in Table 1 of the datasheet. This derating reflects thermal limits of the TO-220FP package with its 5 °C/W junction-to-case resistance and 25 W total dissipation rating at 25°C case temperature.
Does STF17NF25 require a gate resistor for safe operation?
Yes-a gate resistor (typically 4.7 Ω) is required to dampen ringing and control switching speed, as validated in the datasheet's Figure 15 test circuit. Without it, excessive dv/dt can cause oscillation or shoot-through in bridge configurations due to parasitic inductance in gate traces.
Can STF17NF25 replace STP17NF25 in existing designs?
No direct replacement: STF17NF25 has lower power dissipation (25 W vs. 90 W) and higher thermal resistance (5 °C/W vs. 1.38 °C/W), so substituting it into a STP17NF25 layout risks thermal runaway unless board-level heatsinking is significantly increased or operating current reduced below 10 A continuous.
Is the body diode suitable for synchronous rectification?
No-the body diode is not optimized for synchronous rectification. Its reverse recovery time (157 ns) and Qrr (0.91 µC) are too high for efficient 100+ kHz operation. External Schottky or MOSFET-based synchronous rectifiers are required for high-efficiency secondary-side conduction.
STF17NF25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STripFET™ II
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 250 V
- Current - Continuous Drain (Id) @ 25°C:
- 17A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 165mOhm @ 8.5A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 29.5 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1000 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 25W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FP
STF17NF25 FAQ
1.How can I place an order for STF17NF25 through Aetrix?
Please submit a Request for Quotation (RFQ) for STF17NF25 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STF17NF25 reliable?
The price and inventory of STF17NF25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF17NF25 is usually 5 days.
3.What payment methods are accepted for STF17NF25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF17NF25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STF17NF25?
STF17NF25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STF17NF25 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STF17NF25?
For technical support, including STF17NF25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF17NF25 requirements.
6.How does Aetrix verify that STF17NF25 is sourced from the original manufacturer or authorized distributors?
All STF17NF25 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STF17NF25 meets industry standards.
7.What is the process for return or replacement of STF17NF25?
All STF17NF25 units undergo pre-shipment inspection (PSI). If there is an issue with STF17NF25, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STF17NF25 part is unused and in its original packaging.
Return procedure for STF17NF25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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