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Semtech Corporation SC705CSTRT
- Part No.:
- SC705CSTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
SC705CSTRT.pdf
- Description:
- IC PWR SWITCH N-CHAN 1:1 4CSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,669
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Product details
Overview
SC705CSTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping across temperature and current range - enabling robust USB Type-C PD and industrial load switch input protection.
For engineers reviewing the SC705CSTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge, low dynamic resistance (20mΩ), junction capacitance (175pF), thermal performance up to +125°C, and DFN 1.6×1.6mm package compatibility with high-density PCB layouts.
Technical Context
The SC705CSTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under increasing IPP - eliminating linear VC = VBR + IPP × RDYN dependency.
It operates across –40°C to +125°C with guaranteed 22V reverse stand-off voltage, 27.9V max breakdown, and <600nA leakage at VRWM. The device handles unsymmetrical surges per IEC 61000-4-5 (±1kV, RS = 42Ω) and EFT bursts up to ±4kV (IEC 61000-4-4).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surge. |
| Peak Pulse Current | 40A (8/20μs) - supports compliance with IEC 61000-4-5 Level 4 industrial surge immunity testing. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements for connector-facing protection. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 20V bus protection without signal integrity degradation in USB PD applications. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
Pinout & Package
SC705CSTRT is housed in a RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed pad not required for thermal dissipation. All pins must be connected: GND pins (1–3) and IN pins (4–6) are grouped to maximize surge current handling and minimize parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to low-inductance ground plane via multiple vias. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch input); parallel connection ensures uniform current sharing and full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Clamping Voltage | 27.5–28V across 24–40A and –40°C to +125°C - eliminates derating concerns in thermally constrained industrial environments. |
| FET-Based Protection Architecture | Surge-rated shunt FET with drive/trigger circuit - replaces traditional TVS diodes with superior energy handling and lower clamping variation. |
| Low Dynamic Resistance | 20mΩ - reduces voltage overshoot during sub-microsecond transients and improves system-level surge margin. |
| High EFT Immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive burst noise in motor drives and PLC I/O modules. |
Applications
| USB Type-C Power Delivery | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V VBUS lines in USB-C receptacles exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS suppressor placed directly at connector, shunting transients before reaching PD controller or e-fuse. Use Value: Maintains 28V clamping at 40A and 125°C - prevents overvoltage damage to USB PD ICs where conventional TVS would exceed 38V at same conditions. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage stress on internal FET gate oxide and overvoltage protection circuitry. Use Value: Enables use of cost-optimized load switches by absorbing 1120W peak surge energy without latch-up or parametric shift. |
| IoT Edge Node Power Bus | Storage Device 22V Rail Protection |
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways subjected to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-component solution for EOS protection of PMIC inputs and backup power paths. Use Value: 175pF capacitance avoids filtering effects on 22V DC-DC feedback loops while delivering ±30kV ESD robustness. |
Use Scenario: Protecting SATA or NVMe storage module 22V auxiliary supplies against hot-plug transients and board-level coupling. IC Role / Device Role / Timing Role: Standoff protector for high-reliability storage enclosures requiring IEC 61000-4-5 compliance. Use Value: 40A surge rating meets EN 61000-4-5 Class 4 requirements for enterprise storage systems without adding bulkier discrete solutions. |
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 | Same die, identical electrical specs, identical DFN 1.6×1.6mm package - differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC705CSTRT's unspecified quantity). | Direct drop-in replacement; validated for same USB-C PD and load switch use cases per Semtech documentation. | Select TDS2211P.C for volume production with standard reel logistics; SC705CSTRT may reflect alternate packaging or distribution channel. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 30V clamping, smaller 0.65×0.65mm DFN package - optimized for CC/SBU lines, not main VBUS. | Not suitable for 22V bus protection; intended for low-capacitance, low-current signal-line protection in same USB-C ecosystem. | Use uClamp2411ZA only for sideband use (CC/SBU), never as substitute for SC705CSTRT on power rails. |
Compared with TDS2211P.C, SC705CSTRT offers identical protection performance but may differ in reel configuration or traceability marking; versus uClamp2411ZA, SC705CSTRT provides 67% higher surge current capacity and 2V lower clamping - making it the sole valid choice for 22V power-line EOS hardening.
Availability
SC705CSTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V IoT power bus designs requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC705CSTRT 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 high-performance analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The SC705CSTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered specifically to replace conventional TVS diodes in high-voltage, high-energy EOS applications where clamping stability and temperature independence are critical.
FAQ
What is the maximum continuous operating voltage for SC705CSTRT?
The SC705CSTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can reliably withstand up to 22V DC or RMS AC on the protected line without significant leakage or conduction. This rating is confirmed in the absolute maximum ratings table and electrical characteristics section of the official Semtech datasheet Rev 2.5.
Does SC705CSTRT require a thermal pad on the PCB?
No, SC705CSTRT does not require a thermal pad. Its DFN 1.6×1.6mm package dissipates surge energy primarily through the copper planes connected to pins 1–3 (GND) and 4–6 (IN). Semtech explicitly states "no thermal pad is needed" in the layout guidelines, as energy is handled during transient events rather than steady-state operation.
Can SC705CSTRT be used for protecting USB SuperSpeed differential pairs?
No, SC705CSTRT is not suitable for USB SuperSpeed (TX/RX) differential pair protection. Its 175pF junction capacitance would severely degrade signal integrity at multi-Gbps data rates. For those lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), as specified in the USB Type-C protection reference design.
What is the clamping voltage of SC705CSTRT at 125°C ambient temperature?
The clamping voltage of SC705CSTRT remains stable at 27.5–28V even at +125°C ambient, as verified in the "Clamping Voltage vs. Temperature" characteristic plot (Figure on page 3 of the datasheet). This temperature stability is a core differentiator from conventional TVS diodes, whose clamping rises significantly with temperature.
Is SC705CSTRT pin-compatible with other Semtech TDS devices like TDS2401P?
No, SC705CSTRT is not pin-compatible with TDS2401P. While both are 6-pin DFN TDS devices, TDS2401P uses a different pinout (e.g., dedicated enable/control pins) and targets 24V systems with distinct trigger thresholds. SC705CSTRT has a fixed 3-pin GND / 3-pin IN configuration with no control interface - confirmed in Figure 6 (Pin Configuration) of the datasheet.
SC705CSTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 4-WFBGA, CSPBGA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- N-Channel
- Interface:
- On/Off
- Voltage - Load:
- 1.1V ~ 3.6V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 500mA
- Rds On (Typ):
- 64mOhm
- Input Type:
- -
- Features:
- Load Discharge, Slew Rate Controlled
- Fault Protection:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-CSP (0.76x0.76)
SC705CSTRT FAQ
1.How can I place an order for SC705CSTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC705CSTRT 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 SC705CSTRT reliable?
The price and inventory of SC705CSTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC705CSTRT is usually 5 days.
3.What payment methods are accepted for SC705CSTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC705CSTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC705CSTRT?
SC705CSTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC705CSTRT 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 SC705CSTRT?
For technical support, including SC705CSTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC705CSTRT requirements.
6.How does Aetrix verify that SC705CSTRT is sourced from the original manufacturer or authorized distributors?
All SC705CSTRT 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 SC705CSTRT meets industry standards.
7.What is the process for return or replacement of SC705CSTRT?
All SC705CSTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC705CSTRT, 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 SC705CSTRT part is unused and in its original packaging.
Return procedure for SC705CSTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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