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Semtech Corporation SC1189SWTRT
- Part No.:
- SC1189SWTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SC1189SWTRT.pdf
- Description:
- IC REG TRPL BUCK/LNR 200KHZ 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,208
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Product details
Overview
SC1189SWTRT from Semtech is a Transient Diverting Suppressor (TDS) 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), and stable 27.5–28V clamping across temperature and current range. It protects USB PD, Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC1189SWTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge, low dynamic resistance (<20 mΩ), junction capacitance (175 pF), and DFN 1.6×1.6mm 6-lead package compatibility with high-density PCB layouts.
Technical Context
The SC1189SWTRT employs 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 at 24A and 40A-due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C, maintains <600 nA reverse leakage at 22V, and delivers 1120W peak pulse power (8/20μs). Its functional architecture separates trigger threshold (≈25–27.9V breakdown) from clamping behavior, enabling robust protection without thermal derating penalties typical of junction-based TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - defines maximum continuous DC bus voltage it can protect without leakage or degradation |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD test levels for connector-facing protection |
| Dynamic Resistance | 20 mΩ - enables low-voltage-drop shunting, minimizing IR loss and thermal stress during high-current transients |
| Junction Capacitance | 175 pF at 22V, 1 MHz - compatible with 22V power rail protection; not suitable for high-speed data lines |
| Package | DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead - supports compact placement near USB-C connectors or load switch inputs |
Pinout & Package
SC1189SWTRT is housed in a Pb-free, RoHS-compliant DFN 1.6 mm × 1.6 mm × 0.55 mm 6-lead package with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All pins must be connected-three GND pins (1–3) and three IN pins (4–6)-to achieve full 40A surge rating and minimize parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be tied to solid ground plane via multiple vias for lowest inductance path |
| 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBus); shared connection ensures uniform current sharing and full IPP rating |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5 V across 24–40A surge range and –40°C to +125°C-enables predictable protection margin without thermal derating |
| FET-based shunt topology | Replaces PN-junction TVS with low-RDS(on) MOSFET, eliminating voltage rise with current and reducing junction heating |
| High-energy surge handling | 1120 W peak pulse power (8/20μs) supports repeated lightning-surge events in industrial equipment and metering |
| Low-leakage protection | ≤600 nA at 22V allows use on always-on 22V rails without measurable standby current penalty |
| Compact DFN footprint | 1.6 mm × 1.6 mm saves >50% board area vs. SO-8 or SOT-23 TVS solutions rated for equivalent surge performance |
Applications
| USB Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to ESD and system-level surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller/load switch, clamping transients before they reach sensitive silicon. Use Value: Maintains 27.5–28V clamping across temperature-prevents false overvoltage shutdown and avoids over-spec'ing IPP to compensate for TVS thermal drift. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and PLC I/O modules. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents catastrophic failure of load switches during 1kV/42Ω IEC 61000-4-5 surges by holding clamp below 30V-within safe operating area of 30V-rated switches. |
| IoT Device Power Rail Protection | Notebook/Tablet 22V System Bus Protection |
|
Use Scenario: Securing 22V auxiliary power rails in battery-powered IoT gateways and edge sensors deployed in electrically noisy environments. IC Role / Device Role / Timing Role: Standalone EOS guard for non-isolated DC-DC input stages, absorbing fast EFT bursts (±4kV, 5/50ns) and contact ESD. Use Value: Delivers ±4kV EFT immunity and ±30kV ESD without degrading signal integrity-no added capacitance on control lines or timing paths. |
Use Scenario: Protecting main system bus in thin-and-light notebooks and tablets where space-constrained 22V power distribution networks require minimal-footprint protection. IC Role / Device Role / Timing Role: Compact, low-profile suppressor mounted directly at VRM output or battery interface, minimizing trace inductance to protected node. Use Value: Enables 1.6 mm × 1.6 mm layout with no thermal pad-reduces layer count and eliminates solder void risk associated with QFN thermal pads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, pinout, and package; SC1189SWTRT is Semtech's alternate marking for TDS2211P per official ordering documentation | Same use cases: USB PD, load switch, industrial 22V rail protection | Select SC1189SWTRT for tape-and-reel volume procurement; TDS2211P may appear on legacy BOMs or distributor stock |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 33V clamping, smaller 0.65 mm × 0.65 mm 2-pin package | Better suited for CC/SBU lines in USB-C; insufficient for 40A VBus protection | Use uClamp2411ZA only for low-current, low-capacitance auxiliary lines-not as direct replacement for SC1189SWTRT on power rails |
Compared with TDS2211P (identical device) and uClamp2411ZA (lower-power alternative), SC1189SWTRT delivers full 40A surge capability and stable 28V clamping in a 1.6 mm × 1.6 mm footprint-making it the only option among the three qualified for 22V power rail protection in USB PD and industrial load switch designs.
Availability
SC1189SWTRT is available at Aetrix Electronics and suitable for USB Power Delivery systems, industrial load switch interfaces, and 22V IoT power rail protection requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SC1189SWTRT 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 connectivity.
The TDS family-including SC1189SWTRT-is engineered specifically for high-energy EOS protection of 12–36V power and interface lines, replacing traditional TVS diodes where clamping stability, temperature independence, and surge endurance are critical.
FAQ
Is SC1189SWTRT a direct replacement for TDS2211P?
Yes, SC1189SWTRT is Semtech's alternate part number for TDS2211P, sharing identical electrical specifications, pinout, package dimensions, marking code (T22), and tape-and-reel packaging. Both part numbers refer to the same silicon die and functional design-SC1189SWTRT is used in certain distribution channels and volume-ordering contexts.
What is the maximum continuous operating voltage for SC1189SWTRT?
The maximum continuous operating voltage for SC1189SWTRT is 22 V (VRWM), verified per IEC 61000-4-5 and confirmed in the Absolute Maximum Ratings table. Operating above this voltage risks excessive reverse leakage (>600 nA) and accelerated degradation; it is not rated for 24V continuous use.
Can SC1189SWTRT be used on high-speed data lines like USB SuperSpeed or PCIe?
No, SC1189SWTRT is not suitable for high-speed data lines. Its 175 pF junction capacitance at 22V would severely degrade signal integrity on differential pairs operating above ~100 Mbps. It is intended exclusively for 22V power rails and low-bandwidth I/O lines-use RClamp3371ZC (<0.25 pF) for USB SS or DP/DM protection instead.
Does SC1189SWTRT require a thermal pad on the PCB?
No, SC1189SWTRT does not require a thermal pad. The DFN package dissipates surge energy within the silicon die, and the datasheet explicitly states "no thermal pad is needed." Layout best practice emphasizes low-inductance grounding via multiple vias to the inner ground plane-not copper pour under the package.
How does SC1189SWTRT's clamping performance compare to standard TVS diodes at elevated temperature?
Unlike standard TVS diodes-whose clamping voltage rises with temperature and peak current-SC1189SWTRT maintains 27.5–28V clamping from –40°C to +125°C and across 24–40A. This stability prevents overvoltage damage to downstream 24V-rated ICs in hot industrial enclosures where conventional TVS could exceed safe thresholds.
SC1189SWTRT 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:
- 200kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- 1.25V, -
- 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
SC1189SWTRT FAQ
1.How can I place an order for SC1189SWTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC1189SWTRT 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 SC1189SWTRT reliable?
The price and inventory of SC1189SWTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC1189SWTRT is usually 5 days.
3.What payment methods are accepted for SC1189SWTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC1189SWTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC1189SWTRT?
SC1189SWTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC1189SWTRT 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 SC1189SWTRT?
For technical support, including SC1189SWTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC1189SWTRT requirements.
6.How does Aetrix verify that SC1189SWTRT is sourced from the original manufacturer or authorized distributors?
All SC1189SWTRT 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 SC1189SWTRT meets industry standards.
7.What is the process for return or replacement of SC1189SWTRT?
All SC1189SWTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC1189SWTRT, 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 SC1189SWTRT part is unused and in its original packaging.
Return procedure for SC1189SWTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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