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STMicroelectronics STL3NK40
- Part No.:
- STL3NK40
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- 8-PowerVDFN
- Datasheet:
-
STL3NK40.pdf
- Description:
- MOSFET N-CH 400V 430MA POWERFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
STL3NK40 from STMicroelectronics is an N-channel SuperMESH™ Power MOSFET rated for 400 V drain-source voltage, 5.5 Ω max RDS(on) at VGS = 10 V, 0.43 A continuous drain current at Tpcb = 25 °C, and 2.5 W total power dissipation - designed for high-voltage switching in compact power supplies and LED drivers.
For engineers reviewing the STL3NK40 datasheet, STL3NK40 pinout, STL3NK40 application, or STL3NK40 equivalent, key selection criteria include its 4.5 V/ns dv/dt capability, 100% avalanche tested ruggedness, 60 mJ single-pulse avalanche energy, and PowerFLAT™ 5x5 surface-mount package with thermal resistance of 50 °C/W on FR-4.
Technical Context
This device implements ST's SuperMESH™ process - an evolution of PowerMESH™ - delivering reduced on-resistance while maintaining high voltage blocking and robust transient immunity. Its gate threshold voltage (0.8–2.0 V) enables direct drive from low-voltage logic, and its 8.7 nC typical gate charge supports efficient switching up to several hundred kHz.
The integrated body diode exhibits 166 ns reverse recovery time and 300 nC reverse recovery charge under standard test conditions (ISD = 1.4 A, di/dt = 100 A/µs), enabling reliable operation in inductive switching circuits without external snubbers in many cases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 400 V - supports mains-referenced primary-side switching in offline SMPS up to 265 V AC input. |
| RDS(on) max | 5.5 Ω - defines conduction loss at 0.43 A; yields ~1.0 W I²R loss at full rated current. |
| ID cont. | 0.43 A @ Tpcb = 25 °C - usable in low-power adapters, auxiliary supplies, and LED string switches. |
| dv/dt capability | 4.5 V/ns - ensures immunity to false turn-on during fast voltage transients in high-noise environments. |
| EAS | 60 mJ - enables unclamped inductive switching without failure under defined pulse conditions. |
| Qg typ. | 8.7 nC - determines gate drive power and switching speed; compatible with low-current drivers (e.g., <10 mA peak). |
| Rthj-pcb | 50 °C/W - sets junction-to-PCB thermal rise; requires ≥1 in² 2 oz Cu pad for safe 2.5 W dissipation. |
Pinout & Package
STL3NK40 is housed in a PowerFLAT™ 5x5 surface-mount package (JEDEC MO-229WEED), featuring exposed drain pad for thermal and electrical connection. Pin 1 is marked by a dot or notch on the top side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Drain (exposed pad) | Main current path output / heat sink interface | Electrically and thermally connected to PCB copper area; must be soldered to ≥1 in² 2 oz Cu for rated power handling. |
| Source | Reference node for gate control and current return | Connected to ground or low-side return path; forms common reference for VGS control. |
| Gate | Control terminal for channel conduction | High-impedance input requiring <10 µA leakage; driven by logic-level or dedicated gate driver. |
Key Features
| Feature | Design Value |
|---|---|
| SuperMESH™ technology | Optimized cell layout reduces RDS(on) by ~20% vs. prior PowerMESH™ generation while preserving 400 V rating. |
| 100% avalanche tested | Every unit validated for single-pulse EAS ≥ 60 mJ - eliminates need for external clamping in flyback snubberless designs. |
| Extremely high dv/dt capability | 4.5 V/ns minimum - prevents spurious turn-on during fast voltage transitions in high-frequency converters. |
| Low gate charge | 8.7 nC typical Qg - enables efficient switching at >200 kHz with minimal driver power consumption. |
Applications
| LED Lighting Drivers | Offline Auxiliary Power Supplies |
|---|---|
Use Scenario: Constant-current switching regulator driving 1–3 series white LEDs from 85–265 V AC input. IC Role / Device Role / Timing Role: Primary-side high-voltage switch controlling energy transfer into LED string via transformer-coupled feedback. Use Value: 400 V rating and 60 mJ avalanche energy allow direct mains connection without bulk capacitor derating or extra protection circuitry. | Use Scenario: Standby supply in TV or set-top box providing 5 V/0.3 A to microcontroller and sensors when main rail is off. IC Role / Device Role / Timing Role: Low-duty-cycle, high-VDS switch in flyback converter operating in discontinuous conduction mode (DCM). Use Value: 4.5 Ω RDS(on) minimizes no-load losses; PowerFLAT™ 5x5 footprint saves board space versus TO-92 or DPAK alternatives. |
| Industrial Sensor Interface Protection | Low-Power AC-DC Adapters |
Use Scenario: Reverse-polarity and overvoltage protection stage for 24 V DC industrial sensors connected to PLC inputs. IC Role / Device Role / Timing Role: High-side load switch isolating downstream circuitry during fault conditions. Use Value: 4.5 V/ns dv/dt immunity prevents latch-up during ESD or surge events on long sensor cables. | Use Scenario: 5 W wall adapter powering IoT hubs or smart home controllers. IC Role / Device Role / Timing Role: Main power switch in quasi-resonant flyback topology operating at 65–100 kHz. Use Value: 8.7 nC Qg and 128 pF Ciss enable ZVS transition at light loads, improving efficiency across full load range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, low-current switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP3NK40Z | TO-220 package; higher RDS(on) (6.5 Ω); same 400 V rating and avalanche rating. | Requires heatsink for >1 W dissipation; unsuitable for ultra-compact layouts. | Choose when board space is unconstrained and manual assembly preferred. |
| FQP4N40 | TO-220; 4.5 Ω RDS(on); no specified avalanche energy or dv/dt rating. | Lacks production-grade avalanche testing; not recommended for unclamped inductive loads. | Acceptable only in non-critical, low-reliability consumer applications with soft-switching. |
Compared with STL3NK40, STP3NK40Z trades compactness for thermal headroom and ease of prototyping, while FQP4N40 omits critical ruggedness specs - making STL3NK40 the sole choice where space, reliability, and transient immunity are jointly required.
Availability
STL3NK40 is available at Aetrix Electronics and suitable for LED lighting drivers, offline auxiliary power supplies, and industrial sensor interface protection requiring stable component supply and long-term manufacturability.
Supply support for STL3NK40 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 sensing solutions for automotive, industrial, and consumer markets.
The STL3NK40 belongs to ST's SuperMESH™ Power MOSFET product line, engineered specifically for high-voltage, low-power switching applications where compact size, avalanche ruggedness, and dv/dt immunity are essential.
FAQ
What is the maximum continuous drain current at 100 °C PCB temperature?
The STL3NK40 supports 0.27 A continuous drain current when mounted on a 1 inch² FR-4 board with 2 oz copper at Tpcb = 100 °C. This derating reflects thermal limits imposed by the 50 °C/W junction-to-PCB resistance and 150 °C maximum junction temperature.
Does the STL3NK40 have an integrated body diode, and what are its key parameters?
Yes, it includes a monolithic source-drain diode with 0.43 A continuous forward current rating, 1.2 V typical forward voltage at 0.43 A, and 166 ns reverse recovery time at 1.4 A and 100 A/µs di/dt. The diode is fully characterized and qualified for inductive switching.
Can the STL3NK40 be driven directly from a 3.3 V microcontroller GPIO?
No - its gate threshold voltage spans 0.8–2.0 V, but full enhancement requires VGS ≥ 10 V for guaranteed RDS(on) ≤ 5.5 Ω. A 3.3 V signal yields weak conduction and excessive heating; a level-shifted or buffered gate driver is mandatory.
Is the PowerFLAT™ 5x5 package lead-free and RoHS-compliant?
Yes - the STL3NK40 is supplied in ECOPACK®-compliant PowerFLAT™ 5x5 packaging, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. The device is halogen-free and qualifies for lead-free reflow soldering per JEDEC J-STD-020.
STL3NK40 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- SuperMESH™
- Package/Case:
- 8-PowerVDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 400 V
- Current - Continuous Drain (Id) @ 25°C:
- 430mA (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 5.5Ohm @ 220mA, 10V
- Vgs(th) (Max) @ Id:
- 2V @ 50µA
- Gate Charge (Qg) (Max) @ Vgs:
- 13 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 200 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 2.5W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerFLAT™ (5x5)
STL3NK40 FAQ
1.How can I place an order for STL3NK40 through Aetrix?
Please submit a Request for Quotation (RFQ) for STL3NK40 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 STL3NK40 reliable?
The price and inventory of STL3NK40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STL3NK40 is usually 5 days.
3.What payment methods are accepted for STL3NK40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STL3NK40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STL3NK40?
STL3NK40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STL3NK40 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 STL3NK40?
For technical support, including STL3NK40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STL3NK40 requirements.
6.How does Aetrix verify that STL3NK40 is sourced from the original manufacturer or authorized distributors?
All STL3NK40 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 STL3NK40 meets industry standards.
7.What is the process for return or replacement of STL3NK40?
All STL3NK40 units undergo pre-shipment inspection (PSI). If there is an issue with STL3NK40, 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 STL3NK40 part is unused and in its original packaging.
Return procedure for STL3NK40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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