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Vishay Siliconix SQ4940AEY-T1_BE3
- Part No.:
- SQ4940AEY-T1_BE3
- Manufacturer:
- Vishay Siliconix
- Category:
- FET, MOSFET Arrays
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SQ4940AEY-T1_BE3.pdf
- Description:
- MOSFET 2N-CH 40V 8A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,719
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Product details
Overview
SQ4940AEY-T1_BE3 from Vishay Siliconix is an automotive-grade dual N-channel 40 V MOSFET in SO-8 Dual package, with RDS(on) = 0.024 Ω at VGS = 10 V, 8 A continuous drain current at TC = 25 °C, and AEC-Q101 qualification for under-hood power switching in engine control units.
For engineers reviewing the SQ4940AEY-T1_BE3 datasheet, SQ4940AEY-T1_BE3 pinout, SQ4940AEY-T1_BE3 application, or SQ4940AEY-T1_BE3 equivalent, key selection criteria include its 175 °C junction rating, dual-channel layout for half-bridge or load-switch redundancy, and validated UIS robustness for automotive transients.
Technical Context
This dual N-channel MOSFET integrates two independent trench-based silicon die in a single SO-8 Dual (PowerPAK® SO-8 Dual) thermally enhanced package, enabling synchronous rectification or complementary high-side/low-side drive without external isolation. Each channel supports 40 V VDS, 8 A ID (TC = 25 °C), and operates up to +175 °C junction temperature.
It features 100 % Rg and UIS tested units, gate threshold voltage of 1.5–2.5 V, and dynamic parameters including Ciss = 593–741 pF and Qg = 28.4–43 nC - optimized for fast switching in 12 V automotive DC-DC converters and motor drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V - maximum blocking voltage compatible with 12 V automotive battery systems including load-dump transients. |
| RDS(on) @ VGS = 10 V | 0.024 Ω - enables ≤1.9 W conduction loss at 9 A, supporting compact thermal design in space-constrained ECUs. |
| ID (continuous, TC = 25 °C) | 8 A - sufficient for driving solenoids, fuel injectors, or small BLDC motor phases without external heatsinking. |
| Junction temp. range | −55 to +175 °C - certified for under-hood placement per AEC-Q101, eliminating need for remote mounting or derating. |
| Qg (total gate charge) | 28.4–43 nC - balances switching speed and gate driver stress; supports PWM frequencies up to 200 kHz in buck regulators. |
| Ciss | 593–741 pF - low input capacitance reduces Miller effect, improving noise immunity in noisy automotive environments. |
| RthJF | 38 °C/W - junction-to-foot thermal resistance enables direct PCB copper pour cooling, critical for sustained 5.3 A operation at 125 °C case. |
Pinout & Package
SO-8 Dual (PowerPAK® SO-8 Dual) package with exposed drain pads on both channels for enhanced thermal performance and mechanical stability. Dimensions per JEDEC MS-012 with 1.27 mm pitch and 5.0 × 4.0 mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S1) | Source of Channel 1 | Low-side return path for first MOSFET; tied to PCB ground plane for minimal loop inductance. |
| 2 (G1) | Gate of Channel 1 | Control input requiring <2.5 V threshold; driven by isolated or level-shifted gate driver for high-noise immunity. |
| 3 (S2) | Source of Channel 2 | Independent source node - allows floating configuration for high-side switch or half-bridge topology. |
| 4 (G2) | Gate of Channel 2 | Separate gate control enables independent timing or fault isolation between channels. |
| 5 (D1) | Drain of Channel 1 | Exposed pad connection - must be soldered to large copper area for thermal dissipation and EMI reduction. |
| 6 (D2) | Drain of Channel 2 | Second exposed drain pad - supports dual-output configurations like dual-phase buck or redundant load switching. |
| 7 (D1) | Drain of Channel 1 (redundant) | Same node as Pin 5; paralleled for current sharing and lower effective RDS(on) in high-current paths. |
| 8 (D2) | Drain of Channel 2 (redundant) | Same node as Pin 6; provides mechanical reinforcement and improved thermal coupling to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and UHAST - eliminates qualification overhead for Tier 1 suppliers. |
| TrenchFET® technology | Enables 0.024 Ω RDS(on) at 10 V in SO-8 footprint - achieves performance previously requiring larger packages like TO-252. |
| 100 % Rg and UIS tested | Each unit verified for gate resistance consistency and unclamped inductive switching survival - ensures reliability in motor commutation faults. |
| 175 °C max junction temperature | Permits operation in engine bay ambient up to 125 °C with full rated current - avoids thermal shutdown in high-load conditions. |
| Low Coss (103–129 pF) | Reduces turn-off energy loss and improves efficiency in hard-switched topologies like automotive LED drivers. |
Applications
| Engine Control Unit (ECU) Injector Driver | Automotive HVAC Blower Motor Control |
|---|---|
Use Scenario: Driving 12 V solenoid fuel injectors with PWM modulation up to 15 kHz. IC Role / Device Role / Timing Role: Low-side switch controlling injector coil current; handles repetitive 32 A pulsed loads during cranking. Use Value: 0.024 Ω RDS(on) limits conduction loss to <2 W at peak current, enabling direct PCB mounting without heatsink. |
Use Scenario: Controlling brushed DC blower motor speed via half-bridge configuration using both channels. IC Role / Device Role / Timing Role: Dual-channel switch implementing high-side and low-side drive with dead-time management. Use Value: Independent gate terminals (G1/G2) allow precise timing control to prevent shoot-through, while shared thermal pad maintains uniform junction temperature. |
| 12 V Automotive DC-DC Converter Sync Rectifier | Body Control Module (BCM) Load Switch |
Use Scenario: Replacing Schottky diodes in secondary-side synchronous rectification of 12 V output buck converter. IC Role / Device Role / Timing Role: Dual N-channel rectifier operating in parallel to halve conduction loss versus single-device solution. Use Value: Matched RDS(on) across channels ensures balanced current sharing; 175 °C rating sustains >95 % efficiency at full load and 85 °C ambient. |
Use Scenario: Powering infotainment displays, sensors, or lighting modules with overcurrent and thermal protection. IC Role / Device Role / Timing Role: High-reliability load switch with integrated avalanche energy rating (EAS = 15 mJ) for surge suppression. Use Value: AEC-Q101 qualification and 100 % UIS testing ensure survivability against load dump (ISO 7637-2 Pulse 5a) without external TVS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual N-channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL220N4F7AG | 40 V, RDS(on) = 0.022 Ω @ 10 V, but only rated to 150 °C TJ and not AEC-Q101 qualified. | Lacks automotive qualification; suitable for industrial or commercial DC-DC where ambient <105 °C. | Select when cost sensitivity outweighs automotive compliance requirements and thermal margin is available. |
| IRF7341TRPBF | 40 V, RDS(on) = 0.055 Ω @ 10 V, 5.7 A ID, SO-8 package, AEC-Q101 qualified but higher on-resistance. | Lower current capability and higher conduction loss limit use to <3 A continuous loads. | Choose for legacy designs already using IRF7341 footprint and where thermal budget permits higher RDS(on). |
Compared with STL220N4F7AG and IRF7341TRPBF, SQ4940AEY-T1_BE3 uniquely delivers AEC-Q101 qualification, 175 °C operation, and lowest RDS(on) in SO-8 Dual - making it optimal for next-generation automotive power stages demanding both density and ruggedness.
Availability
SQ4940AEY-T1_BE3 is available at Aetrix Electronics and suitable for engine control units, HVAC motor drives, and body control modules requiring stable component supply across extended automotive production lifecycles.
Supply support for SQ4940AEY-T1_BE3 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
Vishay Siliconix is a global leader in discrete semiconductors, specializing in high-reliability MOSFETs, diodes, and optoelectronics for automotive, industrial, and computing markets.
The SQ4940AEY-T1_BE3 belongs to Vishay's TrenchFET® automotive power MOSFET family, engineered specifically for under-hood switching applications demanding AEC-Q101 compliance, high-temperature operation, and low-loss performance in compact packages.
FAQ
What is the maximum continuous drain current rating for SQ4940AEY-T1_BE3 at 125 °C case temperature?
The SQ4940AEY-T1_BE3 supports 5.3 A continuous drain current at TC = 125 °C, as specified in the Absolute Maximum Ratings table. This rating assumes proper PCB copper area for thermal conduction and accounts for RDS(on) increase with temperature - the device maintains 0.036 Ω at 125 °C and 0.043 Ω at 175 °C junction temperature. SQ4940AEY-T1_BE3 is designed to sustain this current without derating in automotive under-hood environments.
Does SQ4940AEY-T1_BE3 support high-side switching configurations?
Yes, SQ4940AEY-T1_BE3 supports high-side switching because each channel has independent source and gate terminals (S1/G1 and S2/G2), allowing Channel 2 to be configured with S2 floating above ground. Its 40 V VDS rating and 20 V VGS tolerance enable bootstrap or isolated gate drive. SQ4940AEY-T1_BE3 is commonly used in half-bridge topologies where one channel serves as high-side and the other as low-side switch.
Is SQ4940AEY-T1_BE3 pin-compatible with standard SO-8 packages?
No, SQ4940AEY-T1_BE3 uses the PowerPAK® SO-8 Dual package, which has identical outline and lead pitch (1.27 mm) to JEDEC MS-012 SO-8 but features dual exposed drain pads (Pins 5/7 and 6/8) and internal dual-die layout. While footprint dimensions match, PCB land patterns must follow Vishay's recommended pattern (Document 72600) to ensure thermal and mechanical integrity - SQ4940AEY-T1_BE3 is not a drop-in replacement for single-die SO-8 MOSFETs.
What does "100 % Rg and UIS tested" mean for SQ4940AEY-T1_BE3?
"100 % Rg and UIS tested" means every SQ4940AEY-T1_BE3 unit undergoes production screening for gate resistance (Rg) consistency and unclamped inductive switching (UIS) robustness. Rg testing ensures gate drive timing predictability, while UIS testing validates survival under worst-case inductive turn-off events (e.g., motor coil interruption). SQ4940AEY-T1_BE3 is rated for 17 A single-pulse avalanche current and 15 mJ energy - critical for automotive motor and solenoid applications.
How does the thermal performance of SQ4940AEY-T1_BE3 compare to standard SO-8 MOSFETs?
SQ4940AEY-T1_BE3 delivers superior thermal performance versus standard SO-8 MOSFETs due to its PowerPAK® SO-8 Dual construction: RthJF = 38 °C/W (junction-to-foot) and RthJA = 112 °C/W (junction-to-ambient on 1"² FR-4). The dual exposed drain pads enable direct thermal coupling to PCB copper, reducing thermal impedance by ~30 % compared to conventional SO-8. SQ4940AEY-T1_BE3 sustains 5.3 A at 125 °C case temperature where typical SO-8 devices derate to ≤3 A.
SQ4940AEY-T1_BE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- TrenchFET®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- MOSFET (Metal Oxide)
- Configuration:
- 2 N-Channel (Dual)
- FET Feature:
- -
- Drain to Source Voltage (Vdss):
- 40V
- Current - Continuous Drain (Id) @ 25°C:
- 8A (Tc)
- Rds On (Max) @ Id, Vgs:
- 24mOhm @ 5.3A, 10V
- Vgs(th) (Max) @ Id:
- 2.5V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 43nC @ 10V
- Input Capacitance (Ciss) (Max) @ Vds:
- 741pF @ 20V
- Power - Max:
- 4W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SQ4940AEY-T1_BE3 FAQ
1.How can I place an order for SQ4940AEY-T1_BE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SQ4940AEY-T1_BE3 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 SQ4940AEY-T1_BE3 reliable?
The price and inventory of SQ4940AEY-T1_BE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SQ4940AEY-T1_BE3 is usually 5 days.
3.What payment methods are accepted for SQ4940AEY-T1_BE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SQ4940AEY-T1_BE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SQ4940AEY-T1_BE3?
SQ4940AEY-T1_BE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SQ4940AEY-T1_BE3 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 SQ4940AEY-T1_BE3?
For technical support, including SQ4940AEY-T1_BE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SQ4940AEY-T1_BE3 requirements.
6.How does Aetrix verify that SQ4940AEY-T1_BE3 is sourced from the original manufacturer or authorized distributors?
All SQ4940AEY-T1_BE3 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 SQ4940AEY-T1_BE3 meets industry standards.
7.What is the process for return or replacement of SQ4940AEY-T1_BE3?
All SQ4940AEY-T1_BE3 units undergo pre-shipment inspection (PSI). If there is an issue with SQ4940AEY-T1_BE3, 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 SQ4940AEY-T1_BE3 part is unused and in its original packaging.
Return procedure for SQ4940AEY-T1_BE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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