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Semtech Corporation SC310ASKTRT
- Part No.:
- SC310ASKTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
SC310ASKTRT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
SC310ASKTRT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance. It protects USB Type-C power delivery buses, load switch inputs, and industrial interfaces where stable clamping under temperature and current stress is critical.
For engineers reviewing the SC310ASKTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated DFN-6 pin mapping, real-world USB PD and load switch protection use cases, and two confirmed alternative suppressors with documented clamping and thermal behavior differences.
Technical Context
The SC310ASKTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A (8/20μs) due to decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with stable 27.5–28V clamping up to 125°C, 22V reverse stand-off voltage, and <600nA leakage at 22V. Its 175pF capacitance at 22V/1MHz and 20mΩ dynamic resistance enable low-voltage overshoot control without signal integrity degradation in high-speed bus protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness standards for connector-facing protection. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve; reduces voltage rise per amp vs. TVS diodes (which exhibit linear VC = VBR + IPP×RDYN). |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for USB PD VBUS protection without degrading power rail stability or turn-on timing. |
| Operating Temp | −40°C to +125°C - supports deployment in industrial enclosures, automotive under-hood modules, and ruggedized IoT edge devices. |
Pinout & Package
SC310ASKTRT is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required; all six terminals are functional and must be connected for full 40A rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be tied to solid ground plane with multiple vias to minimize inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., USB PD VBUS); parallel connection of all three pins lowers impedance and distributes current evenly across 40A surge. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage stays within 27.5–28V from 24A to 40A and −40°C to +125°C - eliminates derating uncertainty in thermal design. |
| FET-based shunt topology | Surge energy diverted through low-RDS(on) MOSFET instead of PN-junction - avoids thermal runaway and enables higher single-pulse energy handling. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot by >10V versus typical 22V TVS diodes at 40A. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive fast transients in motor drives and PLC I/O modules. |
| Space-optimized DFN | 1.6mm × 1.6mm footprint - saves >60% board area vs. SO-8 or SOT-23 TVS solutions rated for equivalent 40A surge. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V USB PD VBUS lines against lightning-induced surges and hot-plug ESD in portable docking stations and power adapters. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed directly at Type-C connector, clamping transients before they reach PD controller and buck-boost ICs. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents false overvoltage shutdown and enables use of cost-optimized 24V-rated downstream components. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) against 1kV/42Ω surges in remote meters and robotic power distribution units. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by internal FET gate oxide, preventing permanent latch-up or gate rupture. Use Value: 40A surge rating and stable clamping ensure load switch survives repeated industrial surge events without parameter drift or failure. |
| IoT Edge Device Power Bus Protection | Storage Device 22V Rail Protection |
Use Scenario: Securing 22V auxiliary rails in battery-powered IoT gateways exposed to ESD during field servicing and conducted surges via PoE-like interfaces. IC Role / Device Role / Timing Role: Standalone transient suppressor on main system power input, coordinated with upstream e-fuse for fault containment. Use Value: 175pF capacitance avoids interaction with 22V DC-DC feedback loops; ±30kV ESD rating eliminates need for secondary ESD arrays. |
Use Scenario: Protecting 22V supply rails in NVMe SSD enclosures and enterprise storage backplanes subject to hot-swap transients and system-level EFT. IC Role / Device Role / Timing Role: High-energy clamping device placed at board edge connector, routing surge current directly to chassis ground. Use Value: 1120W peak pulse power rating handles worst-case storage subsystem surge coupling without thermal saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Identical electrical specs, same DFN-6 package, identical marking code T22 - direct Semtech second-source variant with identical production lot traceability. | No functional difference; used interchangeably in USB PD reference designs and industrial schematics. | Select when requiring Semtech's standard tape-and-reel packaging (3,000 pcs/reel) and official Semtech documentation traceability. |
| SMAJ22A | Standard 22V unidirectional TVS diode; clamps at ~38V @ 24A/125°C (vs. 27.5V for SC310ASKTRT); 500mΩ dynamic resistance; 1000pF capacitance. | Limited to lower-temp, lower-current applications; unsuitable for sustained 40A surges or high-temperature industrial environments. | Choose only for cost-sensitive, non-critical 22V rails where clamping voltage margin >10V is acceptable and thermal derating is managed externally. |
Compared with TDS2211P.C (identical performance, alternate packaging) and SMAJ22A (higher clamping, lower surge rating), SC310ASKTRT delivers guaranteed 27.5V clamping at 40A and full temperature stability - making it the only option for USB PD 3.1 and industrial 22V bus designs demanding zero clamping drift.
Availability
SC310ASKTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch protection circuits, and IoT edge device power bus designs requiring stable component supply with guaranteed surge performance and long-term lifecycle support.
Supply support for SC310ASKTRT 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The SC310ASKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail and interface protection applications.
FAQ
What is the exact clamping voltage of SC310ASKTRT at 40A surge current?
The SC310ASKTRT clamps at 27.5–28V under 40A peak pulse current (8/20μs waveform, 2Ω source impedance), as specified in the Electrical Characteristics table of its official datasheet. This value is guaranteed across −40°C to +125°C and reflects the device's FET-based constant-clamp architecture - not a typical TVS diode's linear VC = VBR + IPP×RDYN behavior. The SC310ASKTRT maintains this tight clamping window regardless of ambient temperature or pulse repetition.
Does SC310ASKTRT require a thermal pad on the PCB?
No, SC310ASKTRT does not require a thermal pad. Its DFN-6 package dissipates surge energy primarily through the copper traces connected to pins 1–3 (GND) and pins 4–6 (IN), and the datasheet explicitly states "no thermal pad is needed" because energy is dissipated in the device during transient events rather than continuously. Layout best practice emphasizes low-inductance grounding via multiple vias to the ground plane - not thermal mass under the package - to maximize 40A surge capability. This applies equally to SC310ASKTRT and its functional twin TDS2211P.C.
Can SC310ASKTRT protect USB Type-C CC and SBU lines?
No, SC310ASKTRT is not intended for USB Type-C CC or SBU line protection. Its 175pF junction capacitance and 22V working voltage are optimized for VBUS or high-current power rails - not low-capacitance, bidirectional data lines. For CC/SBU protection, Semtech recommends uClamp2411ZA (24V, <10pF). SC310ASKTRT is specified exclusively for single-direction, high-energy EOS suppression on 22V-rated power or I/O lines, as confirmed in its Application Information section and USB Type-C Protection Solution diagram.
What is the pin configuration and recommended layout for SC310ASKTRT?
SC310ASKTRT uses a 6-pin DFN package with pins 1–3 as GND and pins 4–6 as IN. All GND pins must connect to a solid ground plane using multiple vias; all IN pins must tie together with a short, wide trace to the protected line. Placement must be adjacent to the connector (e.g., USB Type-C receptacle) to minimize trace inductance. This layout is identical to TDS2211P.C and validated in Semtech's Figure 7 PCB Layout Recommendation - no thermal pad, no keep-out zone under the body, and no floating pins permitted for full 40A rating.
How does SC310ASKTRT differ from standard TVS diodes in surge response?
SC310ASKTRT uses a triggered FET shunt instead of a PN-junction avalanche structure. When a transient exceeds the trigger threshold, the internal drive circuit turns on a low-RDS(on) FET, resulting in near-constant clamping voltage (27.5–28V) from 1A to 40A and −40°C to +125°C. Standard TVS diodes exhibit rising clamping (e.g., +10V from 24A to 40A) and significant thermal derating. This fundamental architecture difference makes SC310ASKTRT uniquely suited for 22V industrial and USB PD applications where clamping predictability is mandatory.
SC310ASKTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 150 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 270µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 25 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
SC310ASKTRT FAQ
1.How can I place an order for SC310ASKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC310ASKTRT 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 SC310ASKTRT reliable?
The price and inventory of SC310ASKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC310ASKTRT is usually 5 days.
3.What payment methods are accepted for SC310ASKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC310ASKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC310ASKTRT?
SC310ASKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC310ASKTRT 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 SC310ASKTRT?
For technical support, including SC310ASKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC310ASKTRT requirements.
6.How does Aetrix verify that SC310ASKTRT is sourced from the original manufacturer or authorized distributors?
All SC310ASKTRT 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 SC310ASKTRT meets industry standards.
7.What is the process for return or replacement of SC310ASKTRT?
All SC310ASKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC310ASKTRT, 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 SC310ASKTRT part is unused and in its original packaging.
Return procedure for SC310ASKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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