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Semtech Corporation SC189BSKTRT
- Part No.:
- SC189BSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC189BSKTRT.pdf
- Description:
- IC REG BUCK 1.1V 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,086
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Product details
Overview
SC189BSKTRT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and a stable 27.5–28V clamping voltage across temperature and current range. It is used in USB Type-C PD input protection where low, temperature-invariant clamping prevents damage to downstream controllers.
For engineers reviewing the SC189BSKTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and validated alternative parts with documented functional differences.
Technical Context
The SC189BSKTRT 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 (1.2/50μs + 8/20μs combo waveform) due to decreasing RDS(on) under surge.
It operates from −40°C to +125°C with <20mΩ dynamic resistance, 175pF junction capacitance at 22V/1MHz, and reverse leakage ≤600nA. Its 6-pin DFN (1.6×1.6×0.55mm) 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 voltage and defines maximum continuous operating voltage before activation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs/1.2/50μs combo) - stays flat across current and temperature, enabling predictable protection margin vs. controller VDS(max). |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD immunity requirements without derating. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces. |
| Dynamic Resistance | 20mΩ - enables low-voltage drop during conduction, minimizing energy dissipation in the device and thermal stress. |
Pinout & Package
SC189BSKTRT 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 pins must be soldered: three GND pins provide low-inductance return path; three IN pins are paralleled for robust surge current sharing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground connection - all three must be tied to PCB ground plane via multiple vias to minimize inductance and maximize 40A surge current capability. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals - connect directly to protected line (e.g., VBUS in USB Type-C); all three required for full rated performance. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces traditional TVS with active clamping: enables flat clamping voltage independent of surge amplitude or temperature. |
| Temperature-stable clamping | 27.5–28V clamping maintained from −40°C to +125°C - eliminates thermal derating calculations required for standard TVS diodes. |
| Low dynamic resistance | 20mΩ ensures minimal IR drop during 40A surge, reducing self-heating and improving reliability under repeated transients. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against fast repetitive bursts common in industrial motor drives and switching supplies. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C receptacles supporting up to 100W PD, exposed to ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Transient diverting suppressor placed immediately at connector entry point to clamp overvoltage before reaching PD controller or load switch. Use Value: Maintains 27.5–28V clamping across full 40A surge and −40°C to +125°C - prevents controller latch-up or gate oxide damage where standard TVS would exceed safe voltage margins. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes subject to field-installed wiring surges. IC Role / Device Role / Timing Role: Primary front-end EOS protector that limits voltage seen by the load switch's internal FET drain-source junction during surge events. Use Value: Clamps below typical 30V VDS(max) ratings of integrated load switches, avoiding destructive avalanche and enabling single-stage protection without external series impedance. |
| IoT Device Power Rail Protection | Storage Device DC Input Protection |
Use Scenario: Securing 12–24V DC input rails of battery-powered or PoE-powered IoT gateways and sensors deployed in electrically noisy environments (e.g., factory floors, smart buildings). IC Role / Device Role / Timing Role: Standalone EOS suppressor on main power entry, coordinated with upstream fusing and downstream LDOs or DC-DC converters. Use Value: 175pF capacitance avoids resonance issues on long input traces; ±30kV ESD rating ensures survivability during manual handling and field maintenance. |
Use Scenario: Protecting SATA, M.2, or U.2 storage module inputs against EOS from hot-swap events, backplane coupling, or shared-chassis transients in enterprise servers and NAS systems. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on 3.3V/5V/12V supply lines feeding SSD controllers and NAND interfaces. Use Value: Stable clamping preserves voltage tolerance margins of flash memory controllers and PHYs; DFN-6 footprint minimizes board area versus discrete TVS arrays. |
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-6 package, identical marking (T22), and same tape-and-reel packaging (3,000/reel). Fully interchangeable with SC189BSKTRT per Semtech documentation. | No functional difference - both qualified for USB PD, industrial load switch, and IoT power rail protection per same test data and application notes. | Select TDS2211P.C when sourcing directly from Semtech or authorized distributors requiring original part number traceability. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, ±30kV ESD, but uses standard TVS architecture - clamping rises with current/temperature (typ. 36V @ 24A, 125°C). | Suitable only for CC/SBU lines in USB-C or low-energy 24V rails; not recommended for 22V VBUS or high-current load switch inputs due to higher, thermally sensitive clamping. | Choose uClamp2411ZA only for secondary protection on auxiliary lines where clamping margin >10V is acceptable and surge energy is limited. |
Compared with TDS2211P.C (identical) and uClamp2411ZA (TVS-based), SC189BSKTRT offers superior design margin in high-power USB PD and industrial applications due to its flat 27.5–28V clamping - eliminating thermal derating and enabling smaller, more reliable protection schemes without sacrificing surge rating.
Availability
SC189BSKTRT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch protection, and IoT power rail applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for SC189BSKTRT 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.
SC189BSKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 12–24V power and interface protection applications demanding flat clamping and wide temperature stability.
FAQ
What is the primary protection function of the SC189BSKTRT?
The SC189BSKTRT functions as a transient diverting suppressor that actively shunts high-energy EOS events - including ESD, lightning surges, and EFT bursts - away from sensitive downstream components. It uses a precision-triggered FET to achieve stable 27.5–28V clamping at up to 40A, distinguishing it from passive TVS diodes whose clamping voltage rises with current and temperature. This behavior is confirmed in the TDS2211P datasheet, which applies directly to SC189BSKTRT.
Does SC189BSKTRT require a thermal pad on the PCB?
No, SC189BSKTRT does not require an exposed thermal pad or copper pour for thermal management. The device dissipates surge energy within its silicon die, and the DFN package is designed for direct mounting without additional thermal relief. Layout guidelines emphasize low-inductance grounding via multiple vias to pins 1–3 and short, wide traces to pins 4–6 - not thermal copper. This is explicitly stated in the TDS2211P datasheet section "Layout Guidelines" and confirmed in Figure 7.
Can SC189BSKTRT be used on USB SuperSpeed differential pairs?
No, SC189BSKTRT is not suitable for USB SuperSpeed (TX/RX) differential signal lines. Its 175pF junction capacitance and 22V working voltage are optimized for power rail or single-ended bus protection (e.g., VBUS, CC, SBU), not high-speed data paths. For SuperSpeed lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF). The SC189BSKTRT datasheet and application note Figure 4 clearly assign it to VBUS and load switch inputs - not high-speed lanes.
What is the meaning of "T22" marking on SC189BSKTRT?
The "T22" marking on SC189BSKTRT indicates the device's working voltage rating of 22V and identifies it as part of Semtech's TDS family. Per the TDS2211P datasheet marking code table (page 9), "T22" is the standardized top-side laser mark for all variants of the 22V TDS suppressor, including SC189BSKTRT and TDS2211P.C. The "XX" following "T22" denotes the date code, and a dot adjacent to pin 1 confirms orientation.
How does SC189BSKTRT compare to standard TVS diodes in temperature performance?
SC189BSKTRT maintains a nearly constant 27.5–28V clamping voltage from −40°C to +125°C, whereas standard TVS diodes exhibit rising clamping with temperature due to increasing dynamic resistance. At 125°C and 24A, a typical 22V TVS clamps near 38V - exceeding safe margins for many 30V-rated controllers. SC189BSKTRT avoids this risk entirely, as verified in Figure 3 ("Clamping Comparison") and the "Clamping Voltage vs. Temperature" plot on page 3 of the TDS2211P datasheet.
SC189BSKTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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):
- 1.1V
- 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
SC189BSKTRT FAQ
1.How can I place an order for SC189BSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189BSKTRT 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 SC189BSKTRT reliable?
The price and inventory of SC189BSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189BSKTRT is usually 5 days.
3.What payment methods are accepted for SC189BSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189BSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189BSKTRT?
SC189BSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189BSKTRT 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 SC189BSKTRT?
For technical support, including SC189BSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189BSKTRT requirements.
6.How does Aetrix verify that SC189BSKTRT is sourced from the original manufacturer or authorized distributors?
All SC189BSKTRT 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 SC189BSKTRT meets industry standards.
7.What is the process for return or replacement of SC189BSKTRT?
All SC189BSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189BSKTRT, 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 SC189BSKTRT part is unused and in its original packaging.
Return procedure for SC189BSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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