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Semtech Corporation SC189CSKTRT
- Part No.:
- SC189CSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC189CSKTRT.pdf
- Description:
- IC REG BUCK 1.2V 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,730
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Product details
Overview
SC189CSKTRT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated I/O or power lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SC189CSKTRT datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping, functional pin roles, real-world clamping behavior under surge conditions, and validated alternatives for 22V bus protection in compact DFN layouts.
Technical Context
The SC189CSKTRT 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 threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under increasing IPP.
It operates over –40°C to +125°C with <20mΩ dynamic resistance (8/20μs), 175pF junction capacitance at 22V/1MHz, and reverse leakage ≤600nA - enabling robust protection without thermal derating penalties typical of junction-based suppressors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds Level 4 requirements for handheld and portable interfaces |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for 22V power rail protection without signal integrity impact |
| Dynamic Resistance | 20mΩ (8/20μs) - enables flat clamping response and minimal VPP rise with increasing surge current |
Pinout & Package
SC189CSKTRT is housed in a RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad not required; all pins must be soldered for full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current - all three pins must be connected to minimize inductance and maximize current sharing |
| 4, 5, 6 | IN | Protected line input - tied together to distribute transient energy across parallel internal FET channels |
Key Features
| Feature | Design Value |
|---|---|
| Constant Clamping Voltage | 27.5–28V across 24–40A and –40°C to +125°C - eliminates thermal derating design margins needed for TVS diodes |
| FET-Based Shunt Architecture | Surge-rated MOSFET triggered by precision circuit - avoids junction heating and enables repeatable high-current clamping |
| Low Dynamic Resistance | 20mΩ - reduces voltage overshoot during fast-rising transients and improves energy diversion efficiency |
| Compact DFN Footprint | 1.6mm × 1.6mm - saves >50% board area vs. SO-8 or SOT-23 TVS solutions rated for equivalent surge energy |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBus lines in USB-C receptacles supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping at 40A surge - prevents latch-up or gate oxide rupture in 24V-tolerant PD controllers under lightning-induced surges. | Use Scenario: Front-end protection for industrial-grade load switches (e.g., HS2950P) powering remote sensors or actuators. IC Role / Device Role / Timing Role: High-energy transient clamp on VIN input to prevent internal FET avalanche failure during 1.2/50μs line surges. Use Value: Enables use of cost-optimized load switches without requiring oversized internal FETs or external series impedance. |
| IoT Device Power Rail Protection | Notebook/Tablet DC Input Protection |
Use Scenario: Securing 22V-rated battery charging inputs or auxiliary power rails in compact IoT edge nodes. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge immunity per IEC 61000-4-2/4-4/4-5. Use Value: Eliminates need for multi-stage protection (TVS + MOV + filter) - reduces BOM count and layout complexity in space-constrained designs. | Use Scenario: Protecting 20V DC-in ports on ultrabooks and tablets against accidental AC mains coupling or hot-plug transients. IC Role / Device Role / Timing Role: First-line clamping device before DC-DC converter input stage. Use Value: Prevents overvoltage shutdown or input capacitor stress during ±1kV (1.2/50μs) common-mode surges per IEC 61000-4-5. |
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 - direct manufacturer-recommended replacement for SC189CSKTRT | No functional difference; used interchangeably in Semtech reference designs for USB-C and load switch protection | Select when sourcing from Semtech's official channel or requiring full traceability to Rev 2.5 datasheet |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping at 20A, 0.25pF capacitance optimized for data lines | Designed for CC/SBU lines in USB-C - not suitable for 22V power rail protection due to lower surge rating and higher clamping | Choose only for low-capacitance signal-line protection; avoid for power rail applications requiring 40A handling |
Compared with TDS2211P and uClamp2411ZA, SC189CSKTRT delivers identical 40A surge capability and 27.5–28V clamping in the same DFN package, while uClamp2411ZA trades surge robustness for ultra-low capacitance - making SC189CSKTRT the sole fit for high-energy 22V bus protection.
Availability
SC189CSKTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch front-ends, IoT power rail protection, and notebook DC-input circuits requiring stable component supply across production lifecycles.
Supply support for SC189CSKTRT 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.
SC189CSKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace traditional TVS diodes in high-reliability 22V power and interface protection where stable clamping and temperature insensitivity are critical.
FAQ
What is the maximum continuous operating voltage for SC189CSKTRT?
The SC189CSKTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously withstand up to 22V DC or RMS on its IN pins relative to GND without conduction. This makes SC189CSKTRT suitable for protecting 20V USB PD buses and other 22V-rated power rails where long-term reliability under nominal voltage is essential.
Does SC189CSKTRT require a thermal pad on the PCB?
No, SC189CSKTRT does not require a thermal pad. Its FET-based architecture dissipates surge energy primarily through conduction rather than junction heating, and the datasheet explicitly states "no thermal pad is needed." Proper layout - including short traces, multiple vias to ground plane, and connection of all GND (pins 1–3) and IN (pins 4–6) terminals - ensures optimal 40A surge performance for SC189CSKTRT.
How does SC189CSKTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN), SC189CSKTRT maintains near-constant clamping (27.5–28V) from 24A to 40A due to its active FET shunt. This eliminates thermal derating and provides predictable protection margins across temperature and surge magnitude - a key advantage confirmed in SC189CSKTRT's characterization curves.
Can SC189CSKTRT be used on high-speed data lines like USB SuperSpeed?
No, SC189CSKTRT is not intended for high-speed data lines. With 175pF junction capacitance, it would severely degrade signal integrity on USB 3.x or PCIe lanes. SC189CSKTRT is designed exclusively for 22V power or low-speed control lines (e.g., USB-C VBus, CC, or load switch enable). For SuperSpeed protection, Semtech recommends RClamp3371ZC (<0.25pF), not SC189CSKTRT.
Is SC189CSKTRT compliant with RoHS and halogen-free standards?
Yes, SC189CSKTRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free - consistent with Semtech's environmental compliance documentation for the TDS family, including SC189CSKTRT and its equivalent TDS2211P.
SC189CSKTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
SC189CSKTRT FAQ
1.How can I place an order for SC189CSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189CSKTRT 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 SC189CSKTRT reliable?
The price and inventory of SC189CSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189CSKTRT is usually 5 days.
3.What payment methods are accepted for SC189CSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189CSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189CSKTRT?
SC189CSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189CSKTRT 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 SC189CSKTRT?
For technical support, including SC189CSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189CSKTRT requirements.
6.How does Aetrix verify that SC189CSKTRT is sourced from the original manufacturer or authorized distributors?
All SC189CSKTRT 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 SC189CSKTRT meets industry standards.
7.What is the process for return or replacement of SC189CSKTRT?
All SC189CSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189CSKTRT, 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 SC189CSKTRT part is unused and in its original packaging.
Return procedure for SC189CSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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