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STMicroelectronics STS15N4LLF3
- Part No.:
- STS15N4LLF3
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STS15N4LLF3.pdf
- Description:
- MOSFET N-CH 40V 15A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,951
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Product details
Overview
STS15N4LLF3 from STMicroelectronics is an N-channel enhancement-mode Power MOSFET in SO-8 package, rated for 40V VDS, 15A continuous drain current at TC = 25°C, and 0.0042Ω RDS(on) @ VGS = 10V. It delivers low conduction and switching losses in high-efficiency DC-DC converters and motor drive half-bridges.
For engineers reviewing the STS15N4LLF3 datasheet, STS15N4LLF3 pinout, STS15N4LLF3 application, or STS15N4LLF3 equivalent, key selection criteria include its 4.5V gate-drive compatibility, 21.5nC total gate charge, rugged 2J single-pulse avalanche energy, and SO-8 thermal performance with Rthj-pcb = 47°C/W on FR-4.
Technical Context
This MOSFET employs ST's "Single Feature Size™" strip-based STripFET™ III process, enabling high cell density and exceptional manufacturing reproducibility. Its optimized RDS(on) × Qg trade-off at 4.5V supports efficient operation in synchronous buck converters and load switches.
The device features a robust source-drain diode with 15A continuous forward current, 1.2V VSD at 15A, and fast 43ns reverse recovery time at 150°C - critical for freewheeling in inductive switching applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40V - maximum blocking voltage in high-side switch or half-bridge leg |
| RDS(on) | 0.0042Ω @ VGS = 10V - enables <1W conduction loss at 15A in PCB-mounted designs |
| Qg | 21.5nC - determines gate driver power requirement and switching speed in 20V/7.5A test conditions |
| EAS | 2J - supports unclamped inductive switching without failure under defined stress (Tj = 25°C, ID = 7.5A) |
| Rthj-pcb | 47°C/W - junction-to-PCB thermal resistance on 1in² 2oz Cu FR-4, defining heatsinking needs |
| VGS(th) | 1V min - ensures reliable turn-on with 3.3V or 5V logic-level gate drivers |
| ID (TC = 100°C) | 9.3A - derated continuous current limit for sustained operation in enclosed industrial environments |
Pinout & Package
STS15N4LLF3 is housed in a standard SO-8 surface-mount package with exposed drain pad (pin 1–4 and 6–8 are source; pin 5 is gate; pins 1–4 and 6–8 internally tied to drain via thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 6–8 | Drain (D) | High-current output node; thermally connected to exposed copper pad for heat dissipation |
| 5 | Gate (G) | Control input requiring ≤±16V bias; 21.5nC total charge drives switching transitions |
| All Source pins | Source (S) | Reference node for gate drive and current sensing; tied internally to pins 1–4 and 6–8 in SO-8 layout |
Key Features
| Feature | Design Value |
|---|---|
| STripFET™ III process | Enables ultra-low RDS(on) × Qg product for high-frequency switching efficiency |
| ECOPACK® packaging | Lead-free second-level interconnect compliant with JEDEC JESD97, suitable for RoHS-compliant assembly |
| Rugged avalanche rating | 2J single-pulse energy withstand capability eliminates need for external snubbers in flyback topologies |
| Low VGS(th) | 1V minimum threshold allows direct interface with 3.3V microcontrollers without level-shifting circuitry |
| Fast body diode | 43ns trr and 3nC Qrr reduce switching losses during synchronous rectification or freewheeling |
Applications
| DC-DC Synchronous Buck Converter | Automotive Body Control Module (BCM) Load Switch |
|---|---|
Use Scenario: High-efficiency 12V-to-3.3V point-of-load converter in telecom infrastructure equipment. IC Role / Device Role / Timing Role: Low-side power switch operating at 500kHz with 15A peak current and 4.5V gate drive. Use Value: 0.0042Ω RDS(on) limits conduction loss to 0.95W at full load, while 21.5nC Qg enables clean 25ns rise time with 4.7Ω gate resistor. | Use Scenario: Solid-state replacement for mechanical relays controlling headlight or HVAC loads in 12V automotive systems. IC Role / Device Role / Timing Role: High-current, logic-level controlled load switch with integrated avalanche protection. Use Value: 2J EAS withstands inductive kickback from lamp filaments; SO-8 footprint simplifies PCB layout versus TO-220 alternatives. |
| Industrial Motor Drive Half-Bridge | USB-C Power Delivery Sink Protection |
Use Scenario: 24V BLDC motor control stage in factory automation actuators. IC Role / Device Role / Timing Role: Upper-leg switch in three-phase inverter, driven by isolated gate driver with 10V supply. Use Value: 40V VDS margin accommodates 30V bus transients; 9.3A ID @ 100°C supports continuous 7A RMS phase current. | Use Scenario: Overcurrent and short-circuit protection switch in 20V/5A USB-C PD sink path. IC Role / Device Role / Timing Role: Fast-turnoff current-limiting FET placed between connector and DC-DC regulator. Use Value: 1V VGS(th) ensures activation by 3.3V system controller; 60A pulsed IDM handles 10× overload for fault clearing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRF7470PBF | RDS(on) = 0.0045Ω @ 10V, Qg = 25nC, same SO-8 package | Slightly higher gate charge increases driver loss; identical avalanche rating | Preferred where gate driver has higher current capability and layout allows minor efficiency trade-off |
| FDMS7680 | RDS(on) = 0.0038Ω @ 10V, Qg = 22nC, dual-MOSFET SO-8 with common-drain configuration | Integrated dual topology reduces board area but requires redesign of gate drive routing | Best for new designs targeting space-constrained DC-DC modules needing matched high/low-side devices |
Compared with IRF7470PBF and FDMS7680, STS15N4LLF3 offers the lowest Qg/RDS(on) ratio among SO-8 40V N-ch devices, making it optimal for high-frequency, thermally constrained applications where gate drive power and junction temperature must be minimized.
Availability
STS15N4LLF3 is available at Aetrix Electronics and suitable for DC-DC converters, automotive load switching, industrial motor drives, and USB-C power delivery protection requiring stable component supply and legacy-design continuity.
Supply support for STS15N4LLF3 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, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
STS15N4LLF3 belongs to the STripFET™ III power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in space- and thermally-constrained power conversion systems.
FAQ
Is STS15N4LLF3 suitable for 3.3V logic-level gate drive?
Yes. With a minimum gate threshold voltage of 1V and guaranteed RDS(on) of 0.005Ω at VGS = 4.5V, STS15N4LLF3 fully turns on using standard 3.3V microcontroller GPIOs. Its low Qg (21.5nC) also minimizes required gate drive current, reducing stress on logic-level drivers.
What is the maximum continuous drain current at 85°C case temperature?
Based on the derating curve and absolute maximum ratings, STS15N4LLF3 supports approximately 11.2A continuous drain current at TC = 85°C. This is interpolated from the linear derating between 15A at 25°C and 9.3A at 100°C, assuming SO-8 mounting on standard FR-4 with 1in² copper.
Does STS15N4LLF3 have a qualified AEC-Q101 rating for automotive use?
No. STS15N4LLF3 is not AEC-Q101 qualified. While it operates across –55°C to 150°C and meets industrial reliability standards, ST does not list it in their automotive-grade portfolio. For automotive BCM or lighting applications, ST recommends AEC-Q101-certified alternatives such as STD15N4LH5.
Can STS15N4LLF3 replace older STS15N4LH5 in existing designs?
Yes, with verification. Both share identical SO-8 package, pinout, and 40V/15A ratings, but STS15N4LLF3 improves RDS(on) (0.0042Ω vs. 0.0045Ω) and reduces Qg (21.5nC vs. 24nC). Thermal and switching performance will improve slightly; no layout or driver changes are needed for drop-in replacement.
STS15N4LLF3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STripFET™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 40 V
- Current - Continuous Drain (Id) @ 25°C:
- 15A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 5mOhm @ 7.5A, 10V
- Vgs(th) (Max) @ Id:
- 1V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 28 nC @ 4.5 V
- Vgs (Max):
- ±16V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2530 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 2.7W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
STS15N4LLF3 FAQ
1.How can I place an order for STS15N4LLF3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STS15N4LLF3 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 STS15N4LLF3 reliable?
The price and inventory of STS15N4LLF3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STS15N4LLF3 is usually 5 days.
3.What payment methods are accepted for STS15N4LLF3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STS15N4LLF3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STS15N4LLF3?
STS15N4LLF3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STS15N4LLF3 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 STS15N4LLF3?
For technical support, including STS15N4LLF3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STS15N4LLF3 requirements.
6.How does Aetrix verify that STS15N4LLF3 is sourced from the original manufacturer or authorized distributors?
All STS15N4LLF3 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 STS15N4LLF3 meets industry standards.
7.What is the process for return or replacement of STS15N4LLF3?
All STS15N4LLF3 units undergo pre-shipment inspection (PSI). If there is an issue with STS15N4LLF3, 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 STS15N4LLF3 part is unused and in its original packaging.
Return procedure for STS15N4LLF3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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