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Semtech Corporation SC120SKTRT
- Part No.:
- SC120SKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SOT-23-6
- Datasheet:
-
SC120SKTRT.pdf
- Description:
- IC REG BST ADJ/1.8V 80MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:32,165
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Product details
Overview
SC120SKTRT 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 PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC120SKTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and validated alternatives for 22V bus protection design.
Technical Context
The SC120SKTRT 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 reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and junction capacitance of 175pF at 22V/1MHz. 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 minimize parasitic inductance and maximize surge current handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream 24V-rated ICs (e.g., USB PD controllers, load switches) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD applications. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without derating. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for VBus protection without distorting 100kHz–1MHz control signaling (e.g., USB PD BMC). |
| Operating Temp | -40°C to +125°C - supports operation in harsh environments including industrial enclosures and automotive under-hood proximity. |
Pinout & Package
SC120SKTRT is housed in a Pb-free, RoHS-compliant 6-lead DFN package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. The compact footprint saves >50% board area versus SO-8 or SOT-23 TVS solutions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to solid ground plane via multiple vias for full 40A surge capability. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBus); shared connection reduces trace inductance and improves current sharing during EOS events. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and -40°C to +125°C - eliminates thermal derating and simplifies worst-case margin analysis. |
| Surge-rated FET protection | Replaces fragile PN-junction TVS with robust MOSFET-based shunt - withstands repeated 40A surges without parameter drift or degradation. |
| Low dynamic resistance | 20mΩ enables <1V overshoot during 10ns/100A dV/dt events - critical for protecting sensitive gate drivers and analog front-ends. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz burst) - ensures reliable operation in electrically noisy industrial PLC and motor drive environments. |
| DFN-6 thermal performance | No thermal pad required; energy dissipated directly through copper traces and ground plane - simplifies layout and avoids solder voiding risks. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V VBus lines in USB-C receptacles against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary high-energy shunt suppressor placed adjacent to the Type-C connector, clamping transients before they reach the PD controller and power path manager. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents false overvoltage shutdown and ensures PD negotiation integrity under stress. |
Use Scenario: Safeguarding input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes exposed to field wiring surges. IC Role / Device Role / Timing Role: Front-end transient guard that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Keeps clamping voltage below 30V - avoids gate oxide rupture and drain avalanche failure in 30V-rated load switches during ±1kV IEC 61000-4-5 tests. |
| Storage Device Power Rail Protection | Notebook/Tablet VBus Line Protection |
Use Scenario: Securing 12–22V supply rails in NVMe SSDs and external HDD enclosures against ESD from user-handled connectors and cable coupling. IC Role / Device Role / Timing Role: Low-capacitance, high-current transient diverter placed between connector and DC-DC input filter stage. Use Value: 175pF capacitance avoids signal integrity issues on 12V/19V rails while delivering 40A surge capacity - eliminates need for series ferrites or RC filters. |
Use Scenario: Protecting VBus routing on thin PCBs in ultrabooks and tablets where layout space is constrained and thermal mass is limited. IC Role / Device Role / Timing Role: Compact, low-profile EOS suppressor mounted directly at USB-C port, minimizing trace length to reduce inductive kick. Use Value: 1.6×1.6mm DFN footprint fits within tight keep-out zones near connectors - enables single-layer ground pour beneath device for optimal return path. |
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. | No functional difference; used interchangeably in Semtech documentation and distributor listings. | Select TDS2211P.C when sourcing from authorized distributors with standard reel packaging; SC120SKTRT may reflect alternate branding or regional distribution channel. |
| uClamp2411ZA.TCT | 24V working voltage, ±30kV ESD, but lower 20A IPP (8/20μs) and higher 33V clamping at 20A - not rated for 40A surge or constant-clamp behavior. | Suitable only for CC/SBU lines or low-power auxiliary rails - insufficient for main VBus or load switch inputs requiring 40A handling. | Choose uClamp2411ZA.TCT only for secondary signal-line protection where clamping voltage margin allows >30V; not a functional replacement for SC120SKTRT in power rail roles. |
Compared with TDS2211P.C (pin-identical and spec-identical) and uClamp2411ZA.TCT (lower surge rating, higher clamping), SC120SKTRT delivers guaranteed 40A/28V performance in the smallest possible footprint - making it the sole choice for space-constrained, high-reliability 22V bus protection where clamping stability is non-negotiable.
Availability
SC120SKTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and notebook VBus protection requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SC120SKTRT 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 ICs for precision sensing, protection, and signal integrity.
The SC120SKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-voltage, high-surge industrial and computing interfaces where clamping voltage stability and repeatable surge endurance are critical.
FAQ
What is the exact package type and dimensions of SC120SKTRT?
SC120SKTRT uses a 6-lead DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad omitted (no thermal slug). Pin 1 is marked by a laser dot; land pattern follows Semtech's recommended 0.30mm pad width and 0.50mm pitch. All six terminals are functional - Pins 1–3 are GND, Pins 4–6 are IN - and must be fully routed per datasheet layout guidelines to achieve rated 40A surge performance.
Does SC120SKTRT meet IEC 61000-4-5 Level 4 surge immunity?
Yes, SC120SKTRT is rated for 40A peak pulse current with 8/20μs waveform per IEC 61000-4-5, which satisfies Level 4 (±1kV, RS = 42Ω, CS = 0.5μF) for unsymmetrical lines. Its 27.5–28V clamping voltage at 40A ensures protected circuits remain within safe operating limits during full-level surge testing - confirmed in Semtech's TDS2211P datasheet Rev 2.5, page 2.
How does SC120SKTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC120SKTRT maintains ~27.5–28V clamping from 24A to 40A and across -40°C to +125°C. This results from its FET-based shunt architecture with decreasing RDS(on) under surge - eliminating thermal derating and enabling predictable protection margins in wide-temperature applications.
Can SC120SKTRT be used to protect USB PD controller VBus pins?
Yes, SC120SKTRT is explicitly validated for USB PD VBus protection in Semtech's application diagrams (Figure 4). With 22V working voltage and 27.5–28V clamping at 40A, it stays well below the 30V absolute maximum rating of common USB PD controllers (e.g., STUSB4500, CYPD3177), preventing latch-up or gate oxide damage during ESD and surge events - even at 125°C ambient.
Is SC120SKTRT RoHS and REACH compliant?
Yes, SC120SKTRT is Pb-free, halogen-free, and compliant with both RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Its molding compound carries UL 94V-0 flammability rating, and lead finish is 100% matte tin - confirmed in the "Mechanical Characteristics" section of the TDS2211P datasheet Rev 2.5, page 1.
SC120SKTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 4.5V
- Voltage - Output (Min/Fixed):
- 1.8V (3.3V)
- Voltage - Output (Max):
- 5V
- Current - Output:
- 80mA
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
SC120SKTRT FAQ
1.How can I place an order for SC120SKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC120SKTRT 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 SC120SKTRT reliable?
The price and inventory of SC120SKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC120SKTRT is usually 5 days.
3.What payment methods are accepted for SC120SKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC120SKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC120SKTRT?
SC120SKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC120SKTRT 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 SC120SKTRT?
For technical support, including SC120SKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC120SKTRT requirements.
6.How does Aetrix verify that SC120SKTRT is sourced from the original manufacturer or authorized distributors?
All SC120SKTRT 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 SC120SKTRT meets industry standards.
7.What is the process for return or replacement of SC120SKTRT?
All SC120SKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC120SKTRT, 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 SC120SKTRT part is unused and in its original packaging.
Return procedure for SC120SKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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