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Semtech Corporation SC189ASKTRT
- Part No.:
- SC189ASKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC189ASKTRT.pdf
- Description:
- IC REG BUCK 1V 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:11,390
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Product details
Overview
SC189ASKTRT 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, 20mΩ dynamic resistance, and 175pF junction capacitance. It protects USB PD and Type-C VBus lines in industrial and portable electronics.
For engineers reviewing the SC189ASKTRT datasheet, pinout, applications, or equivalent options, this device offers stable clamping across temperature and current-critical for load switch input protection, USB Type-C bus hardening, and IoT equipment surge resilience where conventional TVS diodes exhibit rising VC with IPP or temperature.
Technical Context
The SC189ASKTRT 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 standard 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 with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and reverse leakage <600nA at 22V. Its DFN 1.6×1.6×0.55mm package integrates three parallel input terminals (Pins 4–6) and three ground terminals (Pins 1–3) to minimize parasitic inductance and maximize surge current handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD VBus nominal range and avoids false triggering during normal operation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common 30V-rated load switches and PD controllers. |
| 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 mandates without derating. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for DC power rail protection without affecting load switch response or stability. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
Pinout & Package
SC189ASKTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad not required (energy dissipated in FET channel). All six pins are electrically active: three dedicated to ground and three to protected line connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to PCB ground plane via multiple vias for full 40A surge capability. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected bus (e.g., USB PD VBus); shared connection ensures uniform current sharing and minimized trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A - eliminates design margin inflation needed with conventional TVS diodes. |
| Temperature-stable protection | Clamping remains 27.5–28V from –40°C to +125°C - enables reliable protection in uncontrolled thermal environments like industrial enclosures. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - reduces IR drop during surge, preserving downstream voltage integrity. |
| High-energy ESD rating | ±30kV contact/air per IEC 61000-4-2 - exceeds USB Type-C compliance requirements and supports hot-plug robustness. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBus line of a USB Type-C port supporting up to 20V/5A PD negotiation against lightning-induced surges and connector ESD events. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, shunting surge current to ground before it reaches the PD controller or load switch. Use Value: Maintains clamping at ≤28V across full temperature and current range - prevents latch-up or gate oxide damage in 30V-rated PD controllers like STUSB4500 or TUSB7320. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., ON Semiconductor NIS5132MN) powering remote sensors or actuators in metering or robotics systems. IC Role / Device Role / Timing Role: Primary front-end surge clamp on VIN rail, absorbing 40A transients while limiting voltage seen by the switch's internal FET. Use Value: Prevents overvoltage failure of the load switch's integrated MOSFET by holding clamping voltage 2.5V below its absolute maximum rating (30V). |
| IoT Edge Device Power Rail Hardening | Notebook/Tablet DC Power Input Protection |
Use Scenario: Securing the 22V input rail of battery-powered IoT gateways exposed to field ESD and induced surges in smart building or agricultural deployments. IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input, operating without external bias or control signals. Use Value: Delivers 1120W peak pulse power handling in 1.6×1.6mm footprint - replaces bulkier multi-device TVS arrays while reducing BOM count and board area. |
Use Scenario: Protecting the 20V DC input of ultrabooks or tablets using USB-C PD charging, where space constraints limit discrete protection solutions. IC Role / Device Role / Timing Role: Single-chip transient suppressor co-located with the USB-C receptacle, minimizing trace length to <2mm for optimal ESD performance. Use Value: 175pF capacitance avoids compromising power rail stability or causing inrush oscillation in high-bandwidth buck converters feeding CPU/GPU rails. |
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 (T22XX), manufactured by Semtech with same revision history. | No functional difference - direct manufacturer-equivalent variant with identical tape-and-reel packaging (3,000 pcs/reel, 7″ reel). | Select TDS2211P.C when sourcing directly from Semtech distribution channels; SC189ASKTRT is the authorized Aetrix Electronics orderable SKU mapped to this part. |
| SMAJ22A | Standard unidirectional TVS diode; 22V standoff, 35.5V clamping at 14.3A (8/20μs), 1.5Ω dynamic resistance - clamping rises linearly with current and temperature. | Requires higher derating margin for 40A surges; unsuitable for high-temp industrial use where clamping may exceed 40V at 125°C. | Choose SMAJ22A only for cost-sensitive, low-surge (<15A), ambient-temperature-limited designs - not recommended for USB PD or load switch protection. |
Compared with TDS2211P.C (identical function and form) and SMAJ22A (conventional TVS), SC189ASKTRT delivers flat clamping, superior thermal stability, and 40A surge capability in the same compact DFN package - making it the only option qualified for robust USB PD and industrial load switch protection without layout or thermal compromises.
Availability
SC189ASKTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge device power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for SC189ASKTRT 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 power management, protection, sensing, and signal integrity applications.
SC189ASKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power rail protection where flat clamping and temperature stability are mandatory.
FAQ
What is the exact package type and dimensions of SC189ASKTRT?
SC189ASKTRT uses a DFN (Dual Flat No-lead) package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads. Pins 1–3 are ground terminals and Pins 4–6 are input terminals. The package is Pb-free, halogen-free, and RoHS/WEEE compliant with UL 94V-0 flammability rating. No thermal pad is required as energy is dissipated in the FET channel.
Does SC189ASKTRT require any external bias or control signals to operate?
No, SC189ASKTRT is a fully autonomous transient suppressor. It contains an integrated precision trigger circuit and surge-rated FET - no external voltage, enable pin, or configuration is needed. SC189ASKTRT activates automatically when transient voltage exceeds its breakdown threshold (~25–27.9V), making it ideal for plug-and-play protection in USB PD and industrial power rails.
How does SC189ASKTRT's clamping behavior differ from standard TVS diodes like SMAJ22A?
Unlike SMAJ22A - whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN) and increases with temperature - SC189ASKTRT maintains 27.5–28V clamping from 24A to 40A and across –40°C to +125°C. This is achieved via a low-RDS(on) FET shunt that dominates conduction during surge, eliminating voltage drift.
Can SC189ASKTRT be used to protect bidirectional data lines such as USB DP/DM?
No, SC189ASKTRT is designed exclusively for unidirectional DC power or I/O line protection (e.g., USB PD VBus, load switch VIN). Its pin configuration (IN-to-GND only) and 22V working voltage make it unsuitable for low-voltage, bidirectional, high-speed data lines. For DP/DM protection, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), not SC189ASKTRT.
What is the maximum continuous reverse leakage current of SC189ASKTRT at 22V?
At VRWM = 22V and TA = 25°C, SC189ASKTRT exhibits reverse leakage current of 130–600nA. This ultra-low leakage ensures minimal standby power loss in battery-backed or energy-sensitive applications such as IoT sensors and portable medical devices, without compromising surge response time.
SC189ASKTRT 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):
- 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
SC189ASKTRT FAQ
1.How can I place an order for SC189ASKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189ASKTRT 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 SC189ASKTRT reliable?
The price and inventory of SC189ASKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189ASKTRT is usually 5 days.
3.What payment methods are accepted for SC189ASKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189ASKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189ASKTRT?
SC189ASKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189ASKTRT 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 SC189ASKTRT?
For technical support, including SC189ASKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189ASKTRT requirements.
6.How does Aetrix verify that SC189ASKTRT is sourced from the original manufacturer or authorized distributors?
All SC189ASKTRT 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 SC189ASKTRT meets industry standards.
7.What is the process for return or replacement of SC189ASKTRT?
All SC189ASKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189ASKTRT, 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 SC189ASKTRT part is unused and in its original packaging.
Return procedure for SC189ASKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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