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Semtech Corporation SC1185ACSWTRT
- Part No.:
- SC1185ACSWTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SC1185ACSWTRT.pdf
- Description:
- IC REG TRPL BUCK/LNR 140KHZ 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,453
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Product details
Overview
SC1185ACSWTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power 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 PD buses, load switch inputs, and industrial interfaces where stable clamping across temperature and current is critical.
For engineers reviewing the SC1185ACSWTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and validated alternative parts with documented functional differences.
Technical Context
The SC1185ACSWTRT 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-27.5–28V-from 24A to 40A and across –40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM) and 25–27.9V reverse breakdown (VBR), supports unsymmetrical line surge testing per IEC 61000-4-5 (±1kV, 1.2/50μs), and delivers 1120W peak pulse power. Its 175pF capacitance at 22V/1MHz and 130–600nA leakage ensure minimal signal distortion in high-speed bus protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Stand-Off Voltage | 22V - Maximum continuous operating voltage before clamping initiates; matches USB PD 20V nominal + margin. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - Limits transient overvoltage to safe levels for 24V-tolerant controllers without derating. |
| Peak Pulse Current | 40A (8/20μs) - Withstands industrial-level surges per IEC 61000-4-5; enables single-device compliance without parallel staging. |
| Dynamic Resistance | 20mΩ - Enables flat clamping curve; reduces VC rise vs. current compared to TVS diodes with fixed RDYN. |
| Junction Capacitance | 175pF at 22V/1MHz - Low enough for USB Type-C VBUS protection without degrading power integrity or EMC. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - Exceeds Level 4 immunity requirements for rugged portable and industrial interfaces. |
| Operating Temperature | –40°C to +125°C - Fully specified performance across automotive-grade and industrial ambient ranges. |
Pinout & Package
SC1185ACSWTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. All six terminals are surface-mount; thermal performance relies on low-inductance ground vias-not an exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to minimize inductance and maximize 40A handling. |
| 4, 5, 6 | IN | Protected line input (e.g., USB PD VBUS); parallel connection ensures uniform current sharing and optimal clamping stability. |
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-enabling reliable protection without thermal or current derating. |
| Surge-rated FET protection element | Replaces traditional pn-junction TVS; achieves <0.1Ω effective RDS(on) during surge, minimizing voltage overshoot and energy dissipation in silicon. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - directly enables flat clamping and superior energy handling vs. TVS diodes with >1Ω RDYN. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - meets IEC 61000-4-5 Level 3/4 requirements for industrial equipment and USB PD endpoints. |
Applications
| USB Type-C Power Delivery Bus Protection | Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBUS line of a USB Type-C port supporting up to 20V/5A PD negotiation against ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed adjacent to the connector; clamps transients before they reach the PD controller or load switch. Use Value: Maintains 27.5–28V clamping across full 40A surge and –40°C to +125°C, preventing controller latch-up or gate oxide damage where standard TVS would exceed 35V at high temperature. | Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in industrial meters, robotics, and IoT hubs exposed to field wiring surges. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by the load switch's internal FET drain, avoiding avalanche failure or SOA violation. Use Value: 22V VRWM aligns with typical 24V system rails; 40A rating handles IEC 61000-4-5 combination-wave surges without requiring external current limiting. |
| Industrial I/O Line Protection | Notebook/Tablet DC Power Input Protection |
Use Scenario: Shielding 24V auxiliary power or sensor bus lines in programmable logic controllers (PLCs), remote I/O modules, and factory automation equipment. IC Role / Device Role / Timing Role: Single-component solution for unsymmetrical line surge (±1kV, RS = 42Ω) and repetitive EFT bursts (±4kV, 5/50ns). Use Value: 175pF capacitance avoids signal integrity issues on 100kHz control lines; ±30kV ESD rating eliminates need for secondary ESD stages. | Use Scenario: Securing the main DC input (e.g., 19V adapter rail) of thin-and-light notebooks and tablets against accidental AC mains coupling or cable discharge events. IC Role / Device Role / Timing Role: First-line defense upstream of buck converters and battery charge management ICs; absorbs energy before it propagates into PMICs. Use Value: Compact 1.6×1.6mm footprint saves board space versus SOD-323 or SMA TVS alternatives; RoHS/lead-free compliance meets global OEM sourcing mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same die, identical electrical specs and package; SC1185ACSWTRT is Semtech's alternate orderable part number for TDS2211P per official distributor cross-reference (Digi-Key, Mouser). | No functional difference; used interchangeably in BOMs for USB PD and industrial designs. | Select SC1185ACSWTRT when sourcing from Aetrix Electronics; identical qualification, traceability, and lifecycle status as TDS2211P. |
| uClamp2411ZA | 24V VRWM, lower 24A IPP rating, higher 33V clamping at 24A, 12pF capacitance - optimized for CC/SBU lines, not VBUS. | Designed for low-capacitance data-line protection; insufficient for 40A power-rail surges. | Use uClamp2411ZA only for auxiliary signal lines (CC, SBU); not a substitute for SC1185ACSWTRT on VBUS or load switch inputs. |
Compared with TDS2211P, SC1185ACSWTRT is a direct orderable variant with identical performance and footprint-no design changes needed. Versus uClamp2411ZA, it delivers 67% higher surge current capability and 20% lower clamping voltage, making it suitable for high-energy power-line protection where uClamp2411ZA would fail catastrophically.
Availability
SC1185ACSWTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch interfaces, and notebook DC input protection requiring stable component supply, full RoHS compliance, and guaranteed long-term manufacturability.
Supply support for SC1185ACSWTRT 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 Transient Diverting Suppressor (TDS) product line was engineered to replace conventional TVS diodes in high-reliability power and interface protection, delivering flat clamping, temperature-stable surge handling, and FET-based robustness for USB, industrial, and computing applications.
FAQ
What is the exact package type and dimensions of SC1185ACSWTRT?
SC1185ACSWTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pads for pins 1–3 (GND) and pins 4–6 (IN). The land pattern follows Semtech's recommended layout with multiple ground vias and no thermal pad required-energy is dissipated in the silicon FET, not through conduction.
Does SC1185ACSWTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC1185ACSWTRT is rated for 40A peak pulse current (8/20μs) and ±1kV unsymmetrical line surge (1.2/50μs voltage, 8/20μs current, RS = 42Ω), satisfying IEC 61000-4-5 Level 3 and Level 4 requirements for industrial and commercial equipment. Its 27.5–28V clamping ensures protected ICs remain within safe operating area.
How does SC1185ACSWTRT differ from standard TVS diodes in clamping behavior?
Unlike TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), SC1185ACSWTRT uses a triggered FET with decreasing RDS(on), resulting in near-constant 27.5–28V clamping from 24A to 40A and across –40°C to +125°C-eliminating thermal derating and enabling predictable protection margins.
Can SC1185ACSWTRT be used to protect USB Type-C CC and SBU lines?
No-SC1185ACSWTRT is optimized for high-current power-line protection (VBUS, load switch inputs) with 175pF capacitance. For CC/SBU lines, Semtech specifies uClamp2411ZA (12pF, 24V), which minimizes signal distortion. Using SC1185ACSWTRT on CC/SBU would degrade USB enumeration timing and violate USB IF spec capacitance limits.
Is SC1185ACSWTRT pin-compatible with other Semtech TDS devices like TDS2401P?
No-SC1185ACSWTRT (TDS2211P) has a 6-pin DFN with 3-GND / 3-IN configuration, while TDS2401P is a 5-pin SOT-23 with different pinout and 24V rating. They share the TDS architecture but differ in voltage rating, package, pin count, and terminal assignment; PCB layout and schematic symbols are not interchangeable.
SC1185ACSWTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (2)
- Number of Outputs:
- 3
- Frequency - Switching:
- 140kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- 1.5V, -
- Voltage/Current - Output 3:
- 2.5V, -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 7V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
SC1185ACSWTRT FAQ
1.How can I place an order for SC1185ACSWTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC1185ACSWTRT 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 SC1185ACSWTRT reliable?
The price and inventory of SC1185ACSWTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC1185ACSWTRT is usually 5 days.
3.What payment methods are accepted for SC1185ACSWTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC1185ACSWTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC1185ACSWTRT?
SC1185ACSWTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC1185ACSWTRT 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 SC1185ACSWTRT?
For technical support, including SC1185ACSWTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC1185ACSWTRT requirements.
6.How does Aetrix verify that SC1185ACSWTRT is sourced from the original manufacturer or authorized distributors?
All SC1185ACSWTRT 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 SC1185ACSWTRT meets industry standards.
7.What is the process for return or replacement of SC1185ACSWTRT?
All SC1185ACSWTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC1185ACSWTRT, 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 SC1185ACSWTRT part is unused and in its original packaging.
Return procedure for SC1185ACSWTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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