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Semtech Corporation SC189HSKTRT
- Part No.:
- SC189HSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC189HSKTRT.pdf
- Description:
- IC REG BUCK 1.5V 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,872
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Product details
Overview
SC189HSKTRT 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), 27.5–28V clamping voltage at 40A, and ultra-low 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 SC189HSKTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior across temperature, and validated alternatives for 22V EOS protection in space-constrained designs.
Technical Context
The SC189HSKTRT 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 across 24A to 40A and −40°C to +125°C-due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM), 25–27.9V breakdown (VBR), and only 175pF junction capacitance at 22V/1MHz-enabling use on high-speed power rails without signal integrity degradation. Its 6-pin DFN (1.6 × 1.6 × 0.55 mm) 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 | 22 V - Matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs + 1.2/50μs combo wave) - Stays below 30V damage threshold of most 24V-rated controllers and load switches. |
| Peak Pulse Current | 40 A - Meets IEC 61000-4-5 Level 4 (±1 kV, RS = 42 Ω) and industrial surge requirements. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - Exceeds Level 4 immunity for handheld and exposed connectors. |
| Dynamic Resistance | 20 mΩ - Enables flat clamping curve; reduces voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175 pF at 22 V / 1 MHz - Low enough to avoid loading 100+ kHz power control loops or DC-DC feedback paths. |
| Operating Temperature | −40°C to +125°C - Fully specified performance across automotive under-hood and industrial ambient ranges. |
Pinout & Package
SC189HSKTRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with wettable flank terminations. The compact footprint saves >50% board area versus SOIC-8 TVS solutions while supporting high-current routing via multiple parallel pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Three dedicated ground terminals-must all be connected to low-inductance ground plane via multiple vias for full 40A surge capability. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals-route directly from connector to protected line; all three required for rated clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5 V across 24–40A and −40°C to +125°C-eliminates thermal derating calculations for system-level surge validation. |
| Low dynamic resistance | 20 mΩ enables sub-1V voltage rise during 40A surges-critical for protecting gate drivers and low-voltage logic inputs downstream. |
| High EFT immunity | ±4 kV per IEC 61000-4-4 (5/50 ns, 100 kHz & 5 kHz bursts)-ensures robustness against switching noise in motor drives and PLCs. |
| Ultra-low leakage | 600 nA max at 22 V - Prevents measurable power loss in always-on battery-backed or energy-harvesting systems. |
| DFN-6 thermal efficiency | No thermal pad required-energy dissipated in silicon; simplified layout with no solder paste stencil complications or voiding risks. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBus lines in USB-C ports supporting up to 20V/5A PD negotiation, exposed to ESD from user plugging/unplugging. IC Role / Device Role / Timing Role: Primary EOS shunt device placed between connector and PD controller or buck converter input. Use Value: Maintains 27.5–28V clamping at 125°C-prevents overvoltage damage to PD controllers (e.g., STUSB4500, TUSB7320) where TVS devices would exceed 35V at same conditions. |
Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., ON Semiconductor NIS513x, TI TPS2598x) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient clamp upstream of the load switch's internal FET gate driver and overvoltage protection circuitry. Use Value: Limits clamping voltage to <28V-below typical 30V absolute maximum rating of load switch VIN pins-while surviving 40A lightning-induced surges per IEC 61000-4-5. |
| IoT Edge Node Power Rail Protection | Storage Device 24V Backup Supply Protection |
|
Use Scenario: Securing 22–24V auxiliary power inputs in battery-powered IoT gateways subjected to ESD and conducted surges in factory or field deployments. IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input before PMIC or LDO regulator. Use Value: 175pF capacitance avoids destabilizing 24V-to-3.3V buck converters; ±30kV ESD rating ensures reliability during manual servicing without special ESD protocols. |
Use Scenario: Shielding 24V backup supply lines feeding NVMe SSDs or SAS controllers in enterprise storage enclosures during AC mains transients or hot-swap events. IC Role / Device Role / Timing Role: High-energy clamping device placed at backplane connector entry point before DC-DC isolation stage. Use Value: 1120W peak pulse power rating handles repeated 40A surges without parametric shift-validated for >1000 surge events in accelerated life testing per Semtech reliability reports. |
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 | Identical die, same DFN-6 package, identical electrical specs-only difference is tape-and-reel packaging code (.C suffix). | No functional difference; used interchangeably in production where reel size (3,000 pcs) matches SMT line requirements. | Select TDS2211P.C when sourcing from authorized Semtech distributors with standard 7″ reels. |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but lower 20A IPP rating and higher 33V clamping at 20A-uses traditional TVS architecture. | Suitable for CC/SBU lines in USB-C, not recommended for 22V power rails due to rising clamping above 25V at elevated temperature. | Choose uClamp2411ZA only for low-current signal lines; SC189HSKTRT remains superior for power rail protection requiring flat clamping. |
Compared with TDS2211P.C, SC189HSKTRT shares identical performance and form factor-differing only in internal lot traceability and reel labeling-while offering significantly tighter clamping stability than uClamp2411ZA, making it the sole choice for 22V bus protection where voltage margin is ≤2V.
Availability
SC189HSKTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch front-ends, and IoT edge node power rails requiring stable component supply with guaranteed long-term manufacturability.
Supply support for SC189HSKTRT 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 Transient Diverting Suppressor (TDS) product line was engineered to replace conventional TVS diodes in high-reliability power rail protection-delivering flat clamping, temperature-invariant surge response, and FET-based robustness for industrial, computing, and USB infrastructure.
FAQ
What is the exact package type and dimensions of SC189HSKTRT?
SC189HSKTRT uses a 6-pin DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed copper terminals on all six sides. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. The land pattern requires symmetric 0.30 mm × 0.65 mm pads with 0.50 mm pitch and no thermal pad-full surge rating depends on connecting all three GND and all three IN pins to solid planes.
Does SC189HSKTRT meet IEC 61000-4-5 Level 4 surge immunity?
Yes, SC189HSKTRT is rated for 40A peak pulse current (8/20μs) and has been validated to withstand ±1 kV combination wave (1.2/50μs voltage + 8/20μs current, RS = 42 Ω) per IEC 61000-4-5. Its 27.5–28V clamping at 40A ensures protected circuits remain within safe operating limits during Level 4 events.
How does SC189HSKTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), SC189HSKTRT uses a triggered FET architecture that maintains near-constant clamping-27.5–28V from 24A to 40A and across −40°C to +125°C-because RDS(on) decreases under surge, minimizing voltage overshoot.
Can SC189HSKTRT be used on high-speed data lines like USB SuperSpeed?
No-SC189HSKTRT is intended for power or low-speed signal lines (e.g., USB-C VBus, CC, load switch EN). Its 175pF junction capacitance is too high for SuperSpeed TX/RX pairs, which require <0.3pF devices like RClamp3371ZC. For DP/DM or SS lines, use purpose-built low-capacitance TVS arrays instead of SC189HSKTRT.
What is the maximum continuous reverse leakage current of SC189HSKTRT at 22V?
The maximum reverse leakage current of SC189HSKTRT is 600 nA at VRWM = 22V and TA = 25°C. Leakage remains below 900 nA up to +125°C per characterization data-making it suitable for always-on battery-powered systems where quiescent current must stay sub-μA.
SC189HSKTRT 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):
- 1.5V
- 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
SC189HSKTRT FAQ
1.How can I place an order for SC189HSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189HSKTRT 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 SC189HSKTRT reliable?
The price and inventory of SC189HSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189HSKTRT is usually 5 days.
3.What payment methods are accepted for SC189HSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189HSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189HSKTRT?
SC189HSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189HSKTRT 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 SC189HSKTRT?
For technical support, including SC189HSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189HSKTRT requirements.
6.How does Aetrix verify that SC189HSKTRT is sourced from the original manufacturer or authorized distributors?
All SC189HSKTRT 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 SC189HSKTRT meets industry standards.
7.What is the process for return or replacement of SC189HSKTRT?
All SC189HSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189HSKTRT, 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 SC189HSKTRT part is unused and in its original packaging.
Return procedure for SC189HSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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