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Semtech Corporation SC189ZSKTRT
- Part No.:
- SC189ZSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC189ZSKTRT.pdf
- Description:
- IC REG BUCK 3.3V 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,932
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Product details
Overview
SC189ZSKTRT 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 a stable 27.5–28V clamping voltage across temperature and current range - enabling robust USB PD and load switch input protection in space-constrained industrial and portable systems.
For engineers reviewing the SC189ZSKTRT datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp FET-based architecture, DFN 1.6×1.6mm 6-lead package, 22V working voltage, 175pF junction capacitance, and compliance with IEC 61000-4-2/4-4/4-5 standards.
Technical Context
The SC189ZSKTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge - not fixed dynamic resistance.
It operates over –40°C to +125°C, maintains ≤600nA reverse leakage at 22V, and achieves 20mΩ dynamic resistance (measured 1–40A, 8/20μs). Its functional design targets unsymmetrical line protection with 2Ω source impedance per IEC 61000-4-5 combination waveform testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave) - ensures protected ICs (e.g., USB PD controllers) stay below damage thresholds. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD inputs. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD 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 flat clamping response and minimizes voltage rise during fast-rising transients. |
| Operating Temp. | –40°C to +125°C - supports deployment in extended-temperature industrial and automotive edge devices. |
Pinout & Package
SC189ZSKTRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and UL 94V-0 molding compound. The package features three dedicated ground terminals and three parallel input terminals for low-inductance, high-current surge path routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to minimize parasitic inductance and maximize 40A capability. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected bus (e.g., VBUS in USB PD); enables uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping | Delivers <28V clamping up to 40A with <0.1Ω effective RDS(on), eliminating linear VC = VBR + IPP×RDYN drift seen in TVS diodes. |
| Temperature-stable clamping | Clamping voltage varies <0.5V from –40°C to +125°C - critical for reliability in uncooled industrial enclosures. |
| Low dynamic resistance | 20mΩ measured across 1–40A range - reduces voltage overshoot during sub-microsecond ESD events. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated lightning-surge exposure in remote metering and robotics. |
| DFN footprint efficiency | 1.6×1.6mm area saves >60% board space vs. SO-8 or SOT-23 TVS solutions rated for comparable 40A surge. |
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 and hot-plug surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector, diverting transients before reaching PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across full temperature range - avoids overvoltage damage to 24V-tolerant PD ICs even at 125°C ambient. |
Use Scenario: Safeguarding input pins of high-side load switches (e.g., HS2950P) in programmable logic controllers and smart sensors. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage stress on internal FET gate oxide and drain-source junction during lightning-induced surges. Use Value: Prevents latch-up or permanent failure of load switches rated for ≤30V absolute max, using sub-28V clamping at 40A. |
| IoT Edge Node Power Bus Protection | Tablet/Notebook DC Input Protection |
|
Use Scenario: Securing 12–22V power rails in battery-powered IoT gateways subjected to EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Single-device solution for unsymmetrical line protection with no external bias or control signals required. Use Value: ±4kV EFT immunity (IEC 61000-4-4) and 175pF capacitance enable clean power delivery without filtering overhead or signal coupling. |
Use Scenario: Hardening 20V DC input jacks in ultrabooks and 2-in-1 tablets against accidental AC adapter misconnection and ESD. IC Role / Device Role / Timing Role: Standalone transient suppressor mounted adjacent to barrel jack or USB-C port, minimizing trace inductance. Use Value: 1.6×1.6mm DFN footprint allows placement within 2mm of connector - critical for sub-1ns ESD rise time suppression. |
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 marking (T22), and same tape-and-reel packaging (3,000/reel). | No functional difference - TDS2211P.C is the standard orderable variant; SC189ZSKTRT is a Semtech-marketed alternate part number for the same die and assembly. | Select TDS2211P.C for direct alignment with Semtech's official ordering nomenclature and documentation. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A; higher clamping, no FET-based regulation; 200pF capacitance. | Limited to lower-energy surges; clamping rises with temperature and current - unsuitable for sustained 40A or high-temp USB PD designs. | Consider only for cost-sensitive, non-critical 22V rail protection where <30V clamping is not mandatory. |
Compared with SC189ZSKTRT, TDS2211P.C offers identical performance and form factor with full documentation traceability, while SMAJ22A provides lower-cost surge suppression at the expense of clamping stability, temperature resilience, and peak current capability.
Availability
SC189ZSKTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery interfaces, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for SC189ZSKTRT 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.
SC189ZSKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–30V power rail protection applications demanding flat clamping and temperature stability.
FAQ
What is the exact function of SC189ZSKTRT in a circuit?
SC189ZSKTRT functions as a transient diverting suppressor that actively shunts high-energy EOS events - including ESD, EFT, and lightning surges - from protected 22V power or I/O lines to ground. Unlike passive TVS diodes, it uses a triggered FET to achieve near-constant clamping voltage, making SC189ZSKTRT ideal for safeguarding sensitive USB PD controllers and load switches.
Does SC189ZSKTRT require any external bias or control signals to operate?
No, SC189ZSKTRT is fully autonomous and requires no external bias, enable pins, or control logic. Its internal trigger circuit activates the shunt FET automatically when transient voltage exceeds the breakdown threshold. This self-contained operation makes SC189ZSKTRT simple to integrate - just connect Pins 4–6 to the protected line and Pins 1–3 to solid ground.
How does SC189ZSKTRT differ from traditional TVS diodes like SMAJ22A?
SC189ZSKTRT uses a surge-rated FET and precision trigger circuit to maintain ~27.5V clamping from 1A to 40A and across –40°C to +125°C, whereas SMAJ22A - a standard TVS - exhibits rising clamping (up to 35.5V) with increasing current and temperature. SC189ZSKTRT also offers lower dynamic resistance (20mΩ vs. ~1Ω) and superior ESD rating (±30kV vs. ±30kV contact only).
Can SC189ZSKTRT be used on bidirectional data lines such as USB DP/DM?
No, SC189ZSKTRT is designed exclusively for unidirectional, high-voltage power or I/O line protection (e.g., VBUS, load switch inputs). Its 175pF capacitance and 22V working voltage make it unsuitable for high-speed data lines. For USB SuperSpeed or DP/DM protection, low-capacitance TVS devices like RClamp3371ZC (<0.25pF) are recommended instead of SC189ZSKTRT.
What PCB layout practices maximize SC189ZSKTRT's surge performance?
To maximize SC189ZSKTRT's 40A surge capability, connect all three GND pins (1–3) and all three IN pins (4–6) with short, wide copper traces; place the device within 2mm of the connector; use multiple vias to ground plane under GND pads; and avoid thermal relief on GND pins. These practices minimize parasitic inductance - essential for maintaining sub-28V clamping during 8/20μs transients.
SC189ZSKTRT 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):
- 3.3V
- 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
SC189ZSKTRT FAQ
1.How can I place an order for SC189ZSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189ZSKTRT 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 SC189ZSKTRT reliable?
The price and inventory of SC189ZSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189ZSKTRT is usually 5 days.
3.What payment methods are accepted for SC189ZSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189ZSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189ZSKTRT?
SC189ZSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189ZSKTRT 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 SC189ZSKTRT?
For technical support, including SC189ZSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189ZSKTRT requirements.
6.How does Aetrix verify that SC189ZSKTRT is sourced from the original manufacturer or authorized distributors?
All SC189ZSKTRT 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 SC189ZSKTRT meets industry standards.
7.What is the process for return or replacement of SC189ZSKTRT?
All SC189ZSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189ZSKTRT, 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 SC189ZSKTRT part is unused and in its original packaging.
Return procedure for SC189ZSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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