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STMicroelectronics STK20N75F3
- Part No.:
- STK20N75F3
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- PolarPak®
- Datasheet:
-
STK20N75F3.pdf
- Description:
- MOSFET N-CH 75V 20A POLARPAK
- Quantity:
- Payment:
- Shipping:
Inventory:8,269
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Product details
Overview
STK20N75F3 from STMicroelectronics is an N-channel 75 V PolarPAK® Power MOSFET with RDS(on) = 0.0065 Ω (typ), 20 A continuous drain current at TC = 25°C, and ultra-low junction-to-case thermal resistance (0.8 °C/W top drain). It delivers high-efficiency switching in DC-DC converters and motor control stages where low conduction loss and fast gate charge are critical.
For engineers reviewing the STK20N75F3 datasheet, STK20N75F3 pinout, STK20N75F3 application, or STK20N75F3 equivalent, key selection criteria include its 75 V VDS, 40.4 nC total gate charge, 2480 pF input capacitance, avalanche ruggedness (600 mJ), and PolarPAK® package thermal performance for high-density power layouts.
Technical Context
This STripFET™ III MOSFET uses a trench-gate structure optimized for minimal RDS(on) and reduced gate charge-enabling high-frequency synchronous rectification and PWM motor drive. Its dual-side cooling capability (top-drain + source-terminal thermal path) supports compact thermal design on FR-4 PCBs.
The device features a fully encapsulated die with 100% matte tin finish, compliant with RoHS Directive 2002/95/EC. Its source-drain diode exhibits 49.7 ns reverse recovery time and 103.6 nC Qrr at Tj = 150°C, enabling robust body-diode commutation in half-bridge topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 75 V - Maximum blocking voltage for 24–48 V bus applications with margin |
| RDS(on) max | 0.0079 Ω - Ensures ≤1.6 W conduction loss at 20 A, critical for thermal management |
| Qg | 40.4 nC - Enables efficient 100–500 kHz switching with moderate gate driver strength |
| EAS | 600 mJ - Supports unclamped inductive switching without failure in motor drives |
| Rthj-c (top) | 1.0 °C/W - Allows direct heatsinking to top metal, reducing thermal bottleneck vs. standard SO-8 |
| ID (TC=100°C) | 12.5 A - Defines usable current derating in enclosed industrial enclosures |
| Ciss | 2480 pF - Determines Miller effect and gate drive power requirements at high dV/dt |
Pinout & Package
PolarPAK® is a thermally enhanced, leadless surface-mount package with exposed top drain and bottom source terminals. It enables dual-side cooling and achieves <1.0 °C/W junction-to-case thermal resistance via top metal contact.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Top Metal Pad | Drain (D) | Primary high-current path and thermal interface; must be soldered to large copper pour or heatsink |
| Bottom Source Pads | Source (S) | Low-impedance return path; provides secondary thermal path to PCB ground plane |
| Center Pad (G) | Gate (G) | Control terminal; isolated by thin dielectric; requires low-inductance routing to minimize ringing |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low RDS(on) | 0.0065 Ω typ at VGS = 10 V reduces I²R losses in high-current DC-DC output stages |
| Low Qg/Qgd ratio | 40.4 nC / 9.9 nC improves switching efficiency and reduces gate drive power dissipation |
| High avalanche energy rating | 600 mJ single-pulse withstand enables reliable operation during load dump or inductive kick events |
| PolarPAK® thermal architecture | 0.8 °C/W top-junction-to-case resistance allows >50% higher power density than SO-8 equivalents |
Applications
| Brushless DC Motor Drive | Industrial DC-DC Converter |
|---|---|
Use Scenario: Half-bridge leg in 24–48 V BLDC inverters for HVAC blowers and pumps. IC Role / Device Role / Timing Role: High-side and low-side switching element handling 15–20 A phase current with 20 kHz PWM. Use Value: Low RDS(on) and fast switching reduce conduction + switching losses, enabling >96% efficiency at full load. | Use Scenario: Synchronous rectifier in isolated 48 V to 12 V telecom DC-DC modules. IC Role / Device Role / Timing Role: Secondary-side power switch operating at 300 kHz with zero-voltage switching assist. Use Value: 49.7 ns trr and low Qrr minimize body-diode reverse recovery loss and EMI generation. |
| Automotive Body Control Module | LED Driver for High-Bay Lighting |
Use Scenario: Load switch for solenoid valves and relays in 12 V automotive BCMs. IC Role / Device Role / Timing Role: Robust high-side switch with integrated avalanche protection for inductive load switching. Use Value: 600 mJ EAS eliminates need for external snubbers, reducing BOM cost and board space. | Use Scenario: Constant-current switch in 36–72 V LED string drivers for warehouse lighting. IC Role / Device Role / Timing Role: Primary current-regulating FET in buck topology with analog dimming control. Use Value: 75 V VDS provides margin over 60 V LED string transients, ensuring long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel 75 V Power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL20N75F3 | Same die in smaller PolarPAK® "L" variant; RDS(on) = 0.0079 Ω max; lower ID rating (16 A @ TC = 25°C) | Targeted for space-constrained consumer power supplies; reduced thermal mass limits sustained current | Select when PCB area is constrained and peak current ≤16 A; verify thermal pad layout per Figure 21 |
| IPB20N75CF3 | Infineon OptiMOS™ 3; RDS(on) = 0.0075 Ω max; Qg = 38 nC; different gate threshold (2.5–3.5 V) | Optimized for 12 V gate drive; slightly faster turn-off but lower avalanche rating (450 mJ) | Prefer for 12 V gate drive systems requiring tighter VGS(th) distribution; avoid in unclamped inductive loads |
Compared with STL20N75F3 and IPB20N75CF3, STK20N75F3 offers superior thermal resistance (0.8 °C/W vs. ≥1.2 °C/W) and highest avalanche ruggedness-making it optimal for industrial motor drives where thermal headroom and fault tolerance are critical.
Availability
STK20N75F3 is available at Aetrix Electronics and suitable for brushless DC motor drives, industrial DC-DC converters, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for STK20N75F3 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
The STripFET™ III Power MOSFET product line targets high-efficiency power conversion, emphasizing low RDS(on), fast switching, and ruggedness in compact packages like PolarPAK® for space- and thermally constrained applications.
FAQ
What is the maximum continuous drain current at 100°C case temperature?
The STK20N75F3 supports 12.5 A continuous drain current at TC = 100°C, as specified in Table 2 of the datasheet. This derating reflects thermal limitations of the PolarPAK® package on standard FR-4 PCBs and must be validated with actual board layout and airflow conditions.
Does STK20N75F3 require a gate resistor for safe operation?
Yes-a gate resistor (typically 4.7 Ω, per Figure 13 test circuit) is required to control dV/dt and prevent oscillation during switching. The 40.4 nC total gate charge and low gate input resistance (0.85 Ω typical) make external gate resistance essential for stable turn-on/turn-off behavior.
Can STK20N75F3 be used in synchronous rectification applications?
Yes-its low RDS(on) (0.0065 Ω), fast reverse recovery (49.7 ns), and low Qrr (103.6 nC) make it suitable for secondary-side synchronous rectification in isolated DC-DC converters up to 300 kHz, provided gate drive timing avoids shoot-through.
Is the PolarPAK® package RoHS-compliant?
Yes-the STK20N75F3 features 100% matte tin finish and complies with EU Directive 2002/95/EC (RoHS). ST's ECOPACK® documentation confirms this part meets all applicable environmental requirements for lead-free assembly and end-of-life handling.
STK20N75F3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STripFET™
- Package/Case:
- PolarPak®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 75 V
- Current - Continuous Drain (Id) @ 25°C:
- 20A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 7mOhm @ 10A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 53 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 3150 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 5.2W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PolarPak®
STK20N75F3 FAQ
1.How can I place an order for STK20N75F3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK20N75F3 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 STK20N75F3 reliable?
The price and inventory of STK20N75F3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK20N75F3 is usually 5 days.
3.What payment methods are accepted for STK20N75F3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK20N75F3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK20N75F3?
STK20N75F3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK20N75F3 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 STK20N75F3?
For technical support, including STK20N75F3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK20N75F3 requirements.
6.How does Aetrix verify that STK20N75F3 is sourced from the original manufacturer or authorized distributors?
All STK20N75F3 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 STK20N75F3 meets industry standards.
7.What is the process for return or replacement of STK20N75F3?
All STK20N75F3 units undergo pre-shipment inspection (PSI). If there is an issue with STK20N75F3, 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 STK20N75F3 part is unused and in its original packaging.
Return procedure for STK20N75F3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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