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Semtech Corporation SC189YSKTRT
- Part No.:
- SC189YSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC189YSKTRT.pdf
- Description:
- IC REG BUCK 2.5V 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,994
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Product details
Overview
SC189YSKTRT 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, and 20mΩ dynamic resistance. 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 SC189YSKTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior across temperature and current, and validated alternatives for 22V bus protection in USB PD, IoT, and industrial equipment.
Technical Context
The SC189YSKTRT 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 reverse stand-off voltage (VRWM) of 22V, breakdown voltage (VBR) of 25–27.9V at 1mA, and ultra-low junction capacitance of 175pF at 22V/1MHz-enabling use on high-speed power rails without signal integrity degradation. Its 6-pin DFN package integrates three parallel input terminals (pins 4–6) and three ground terminals (pins 1–3) to maximize surge current handling and minimize parasitic inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of most 24V-rated controllers and load switches. |
| 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 automotive and consumer ESD requirements without external staging. |
| Dynamic Resistance | 20mΩ - ensures minimal voltage rise under fast-rising transients, critical for protecting sensitive gate drivers. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for DC power rail protection without affecting downstream regulation stability. |
| Operating Temperature | –40°C to +125°C - supports extended-range operation in enclosed industrial enclosures and automotive under-hood proximity. |
Pinout & Package
SC189YSKTRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six terminals must be connected-three GND pins for low-inductance return path and three IN pins for parallel surge current sharing-to achieve rated 40A performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground reference for trigger circuit and shunt FET source; all three must be soldered to solid ground plane with multiple vias. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals tied directly to protected line (e.g., VBUS in USB-C); enables 40A rating via current sharing and reduced trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <0.5V from 24A to 40A-eliminates need for over-spec'ing IPP to meet voltage thresholds. |
| Temperature-stable clamping | 27.5–28V clamping maintained from –40°C to +125°C-removes thermal derating calculations for industrial designs. |
| Low dynamic resistance | 20mΩ RDYN minimizes IR drop during surge-preserves voltage margin for downstream 24V logic and analog circuits. |
| High-energy ESD robustness | ±30kV contact/air withstand enables single-device protection for unshielded connectors in handheld and field-deployed IoT devices. |
| DFN-6 space efficiency | 1.6mm × 1.6mm footprint saves >60% board area vs. SO-8 TVS solutions-critical for compact USB-C receptacle layouts. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation against lightning-induced surges and connector hot-plug transients. IC Role / Device Role / Timing Role: Transient diverting suppressor placed between connector and PD controller/load switch, clamping transients before they reach IC inputs. Use Value: Maintains 27.5–28V clamping at full 40A surge-prevents latch-up or gate oxide damage in PD controllers rated for ≤30V absolute maximum. |
Use Scenario: Safeguarding input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and programmable logic controllers exposed to 1kV/42Ω surges. IC Role / Device Role / Timing Role: Primary front-end protector shunting surge current away from the load switch's internal MOSFET drain-source path. Use Value: Keeps clamping voltage below the 30V VDS(max) of common 24V load switches-avoids destructive avalanche failure during repeated surge events. |
| IoT Edge Node Power Rail Protection | Storage Device 24V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary power rails in battery-backed wireless sensors and gateways subjected to ESD during field servicing and EMC testing. IC Role / Device Role / Timing Role: Standalone EOS protector on DC input traces entering the PCB, located within 2mm of the connector per layout guidelines. Use Value: Delivers ±30kV ESD immunity without adding series impedance or capacitance-preserves power rail stability for low-noise analog sensor front-ends. |
Use Scenario: Protecting 24V backup supply inputs in NVMe SSDs and enterprise storage controllers against power-line transients during data center brownouts or switching events. IC Role / Device Role / Timing Role: High-energy clamp on the 24V standby rail upstream of buck converters and PMICs. Use Value: 1120W peak pulse power rating handles sustained 40A surges-ensures no shutdown or data corruption during multi-millisecond grid disturbances. |
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, same DFN-6 package; differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC189YSKTRT's unspecified quantity). | No functional difference-fully interchangeable in design and layout. | Select TDS2211P.C if standard Semtech reel size and traceability are required for automated assembly. |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but lower 20A IPP rating and higher 33V clamping at 20A; SOD-323 package (smaller, but single-terminal input). | Suitable for CC/SBU lines in USB-C, not for high-current VBUS or load switch inputs. | Choose uClamp2411ZA only for low-capacitance (<0.5pF), low-current signal line protection-not as a replacement for SC189YSKTRT's 40A power rail role. |
Compared with TDS2211P.C, SC189YSKTRT offers identical protection performance and layout compatibility; versus uClamp2411ZA, it delivers double the surge current capacity and 5.5V lower clamping-making it the sole viable option for 22V/40A industrial power rail protection.
Availability
SC189YSKTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT edge node power rails requiring stable component supply with guaranteed long-term manufacturability and full traceability.
Supply support for SC189YSKTRT 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 semiconductors for precision protection, sensing, and connectivity.
SC189YSKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-energy, temperature-critical 20–24V power rail applications where clamping stability and surge robustness are non-negotiable.
FAQ
What is the exact package type and dimensions of SC189YSKTRT?
SC189YSKTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pad. Pin pitch is 0.5mm, and the marking "T22" appears adjacent to pin 1. The package is Pb-free, halogen-free, and RoHS/WEEE compliant with UL 94V-0 flammability rating. This matches Semtech's standardized DFN-6 footprint for TDS devices.
Does SC189YSKTRT require a thermal pad or heatsink on the PCB?
No, SC189YSKTRT does not require an external thermal pad or heatsink. Its energy dissipation occurs internally in the silicon during transient events, and the DFN package is designed for direct mounting without thermal vias. Layout best practice emphasizes low-inductance grounding via multiple vias under pins 1–3-not thermal conduction.
How does SC189YSKTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC189YSKTRT maintains near-constant clamping-27.5–28V from 24A to 40A-due to its FET-based shunt architecture and decreasing RDS(on). This eliminates thermal derating and simplifies margin analysis for 22V system designs.
Can SC189YSKTRT be used on high-speed data lines like USB SS or PCIe?
No, SC189YSKTRT is not intended for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on superspeed lanes. It is strictly for DC power rails and low-frequency control lines. For USB SS/PCIe, Semtech recommends RClamp3371ZC (<0.25pF) instead of SC189YSKTRT.
What is the maximum operating temperature range for SC189YSKTRT?
SC189YSKTRT is rated for continuous operation from –40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range-27.5–28V at 40A-making it suitable for sealed industrial enclosures and automotive under-dash environments where thermal management is limited.
SC189YSKTRT 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):
- 2.5V
- 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
SC189YSKTRT FAQ
1.How can I place an order for SC189YSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189YSKTRT 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 SC189YSKTRT reliable?
The price and inventory of SC189YSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189YSKTRT is usually 5 days.
3.What payment methods are accepted for SC189YSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189YSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189YSKTRT?
SC189YSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189YSKTRT 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 SC189YSKTRT?
For technical support, including SC189YSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189YSKTRT requirements.
6.How does Aetrix verify that SC189YSKTRT is sourced from the original manufacturer or authorized distributors?
All SC189YSKTRT 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 SC189YSKTRT meets industry standards.
7.What is the process for return or replacement of SC189YSKTRT?
All SC189YSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189YSKTRT, 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 SC189YSKTRT part is unused and in its original packaging.
Return procedure for SC189YSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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