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Semtech Corporation SC189LSKTRT
- Part No.:
- SC189LSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC189LSKTRT.pdf
- Description:
- IC REG BUCK 1.8V 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,429
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Product details
Overview
SC189LSKTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping across temperature and current range - enabling robust USB Type-C PD bus protection in industrial and mobile systems.
For engineers reviewing the SC189LSKTRT 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 layout compatibility with high-density USB PD and load switch input designs.
Technical Context
The SC189LSKTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 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 achieves 1120W peak pulse power handling. Its functional architecture isolates surge energy dissipation into the FET channel rather than the junction, enabling superior thermal stability versus standard TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surges. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - provides system-level ESD robustness without external shielding or layout mitigation. |
| Dynamic Resistance | 20 mΩ - enables low-voltage drop during high-current transients, minimizing power dissipation and thermal stress. |
| Junction Capacitance | 175 pF at 22V / 1 MHz - compatible with USB PD bus signaling integrity; no signal distortion on 20V power rails. |
| Package | DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead - supports ultra-compact placement near connectors with minimal PCB area (<2.56 mm²). |
Pinout & Package
SC189LSKTRT is housed in a Pb-free, RoHS-compliant DFN 1.6 mm × 1.6 mm × 0.55 mm package with exposed pad not electrically connected. All six terminals are surface-mount; pins 1–3 form a common ground path, and pins 4–6 form a common input path - both groups must be fully connected for rated 40A surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three pins must be routed to solid ground plane with multiple vias to minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS in USB PD); all three pins must be shorted together externally and placed adjacent to connector entry point. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient diversion | Replaces traditional TVS diode with active shunt FET, delivering flat clamping voltage independent of surge amplitude or temperature. |
| Stable clamping over temperature | 27.5–28 V clamping maintained from –40°C to +125°C - eliminates derating concerns in industrial or automotive ambient environments. |
| Low dynamic resistance | 20 mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot and localized heating during multi-pulse events. |
| High-energy surge rating | 1120 W peak pulse power (8/20μs) - exceeds IEC 61000-4-5 requirements for 22V systems with 42Ω source impedance. |
| Ultra-low leakage | ≤600 nA at 22V - prevents standby current drain in battery-powered IoT and portable equipment. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C PD ports against lightning-induced surges and contact ESD. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector entry, diverting >40A transients to ground before reaching PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping across full temperature range - avoids overvoltage damage to sensitive 24V-tolerant PD ICs even at 125°C ambient. |
Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by internal FET gate oxide during 1.2/50μs surges. Use Value: Prevents gate-oxide rupture and latch-up in load switches by clamping below 28V - eliminating need for oversized, costly discrete TVS arrays. |
| Notebook/Tablet VBUS Line Protection | IoT Device Power Rail Protection |
Use Scenario: Securing 20V power rails in thin-client notebooks and detachable tablets where board space and thermal margin are constrained. IC Role / Device Role / Timing Role: Single-component solution replacing dual-stage TVS + MOV networks, reducing BOM count and layout complexity. Use Value: 1.6×1.6mm footprint saves >60% board area vs. legacy SOD-123 TVS solutions while delivering higher surge rating and lower clamping. |
Use Scenario: Hardening 22V auxiliary power inputs in smart sensors, edge gateways, and wireless modems deployed in uncontrolled environments. IC Role / Device Role / Timing Role: Standalone EOS guard for always-on power domains subject to field ESD, induced surges, and hot-plug transients. Use Value: ±30kV ESD immunity and 4kV EFT tolerance ensure reliable operation in harsh RF/noisy industrial settings without firmware intervention. |
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 electrical specs, same DFN 1.6×1.6mm package, identical pinout and marking code T22 - direct Semtech-recommended replacement. | No functional difference; used interchangeably in USB PD reference designs and production BOMs. | Select TDS2211P.C when sourcing from authorized Semtech distributors with full traceability and date-code visibility. |
| uClamp2411ZA.TCT | Zener-based TVS with 24V working voltage, 33V clamping at 1A, 12A peak pulse, and 0.25pF capacitance - significantly lower surge rating and higher clamping voltage. | Suitable only for CC/SBU lines in USB-C; not rated for VBUS or power rail protection due to insufficient IPP and clamping margin. | Use uClamp2411ZA.TCT only for low-capacitance data-line protection - never as substitute for SC189LSKTRT on 22V power paths. |
Compared with TDS2211P.C, SC189LSKTRT offers identical performance and fit; compared with uClamp2411ZA.TCT, SC189LSKTRT provides 3.3× higher peak current, 5.5V lower clamping, and proven suitability for 22V bus protection - making it the sole viable option for high-energy power-rail EOS suppression.
Availability
SC189LSKTRT is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch inputs, and notebook/tablet VBUS protection requiring stable component supply, full RoHS compliance, and guaranteed long-term lifecycle support.
Supply support for SC189LSKTRT 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 SC189LSKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-voltage, high-surge industrial and consumer power interfaces where clamping stability and thermal resilience are critical.
FAQ
What is the maximum continuous operating voltage for SC189LSKTRT?
The SC189LSKTRT has a reverse stand-off voltage (VRWM) of 22 V, meaning it can continuously block up to 22 V DC without significant leakage or conduction. This makes SC189LSKTRT ideal for protecting 20V USB PD buses and other 22V-rated power rails where sustained voltage exposure occurs during normal operation.
Does SC189LSKTRT require a thermal pad on the PCB?
No, SC189LSKTRT does not require a thermal pad. Its energy dissipation occurs primarily through the active FET channel during transient events, not via junction heating. The datasheet explicitly states "no thermal pad is needed," and the DFN package relies on low-inductance ground connections (pins 1–3) and short input traces (pins 4–6) for optimal surge performance.
Can SC189LSKTRT be used on USB SuperSpeed differential pairs?
No, SC189LSKTRT is not suitable for USB SuperSpeed (TX/RX) differential signal lines. With 175 pF junction capacitance, it would severely distort high-speed signals. SC189LSKTRT is designed exclusively for single-ended power or control lines like VBUS, CC, or load switch inputs - low-capacitance devices such as RClamp3371ZC are required for SuperSpeed protection.
How does SC189LSKTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC189LSKTRT uses an active FET shunt that maintains near-constant clamping (27.5–28 V) from 24A to 40A. This eliminates design uncertainty caused by temperature-dependent VC drift and ensures predictable protection margins across operating conditions.
Is SC189LSKTRT pin-compatible with other Semtech TDS devices?
SC189LSKTRT shares the same DFN 1.6×1.6mm 6-lead package and pin configuration (pins 1–3 = GND, pins 4–6 = IN) with TDS2211P.C and TDS2411P, but is not functionally interchangeable with higher-voltage variants like TDS3311P (33V). Always verify working voltage, clamping, and surge rating match the target application before substitution.
SC189LSKTRT 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):
- 1.8V
- 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
SC189LSKTRT FAQ
1.How can I place an order for SC189LSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189LSKTRT 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 SC189LSKTRT reliable?
The price and inventory of SC189LSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189LSKTRT is usually 5 days.
3.What payment methods are accepted for SC189LSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189LSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189LSKTRT?
SC189LSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189LSKTRT 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 SC189LSKTRT?
For technical support, including SC189LSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189LSKTRT requirements.
6.How does Aetrix verify that SC189LSKTRT is sourced from the original manufacturer or authorized distributors?
All SC189LSKTRT 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 SC189LSKTRT meets industry standards.
7.What is the process for return or replacement of SC189LSKTRT?
All SC189LSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189LSKTRT, 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 SC189LSKTRT part is unused and in its original packaging.
Return procedure for SC189LSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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