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Semtech Corporation SC2442ITSTRT
- Part No.:
- SC2442ITSTRT
- Manufacturer:
- Semtech Corporation
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SC2442ITSTRT.pdf
- Description:
- IC REG CTRLR BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
SC2442ITSTRT 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 24–40A, and 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC2442ITSTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance, DFN-6 package layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards.
Technical Context
The SC2442ITSTRT 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 from −40°C to +125°C due to decreasing RDS(on) under surge.
It operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V (It = 1mA), and exhibits only 175pF junction capacitance at 22V/1MHz. Its 6-pin DFN 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 - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - ensures downstream ICs (e.g., USB PD controllers) 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 interfaces. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without degradation. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs) - enables stable clamping and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for VBus protection without signal integrity impact on DC/low-frequency power lines. |
Pinout & Package
SC2442ITSTRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no solder mask defined). All six terminals must be connected: pins 1–3 serve as low-inductance ground return paths; pins 4–6 form a parallel input node for the protected line.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Three dedicated ground terminals - must be tied together and connected to PCB ground plane via multiple vias to minimize surge loop inductance. |
| 4, 5, 6 | IN | Parallel-connected input terminals - connect directly to protected bus (e.g., USB PD VBus); all three required for full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage stays within 27.5–28V across full 24–40A surge range and −40°C to +125°C - eliminates derating uncertainty vs. TVS diodes. |
| Low dynamic resistance | 20mΩ enables minimal voltage rise under surge, reducing stress on downstream FETs and controllers in load switch applications. |
| High-energy ESD immunity | ±30kV contact/air per IEC 61000-4-2 - supports robust front-end protection for consumer and industrial connectors without external shielding. |
| Compact DFN-6 footprint | 1.6mm × 1.6mm area saves >50% board space vs. SO-8 or SOT-23 TVS solutions rated for comparable surge energy. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the 20–22V VBus line in USB Type-C ports supporting Power Delivery up to 100W. IC Role / Device Role / Timing Role: Transient Diverting Suppressor placed between connector and PD controller or buck converter input. Use Value: Maintains clamping at ≤28V across temperature and surge current - prevents overvoltage damage to PD controllers rated for 24–28V absolute max. |
Use Scenario: Safeguarding the input of industrial-grade load switches (e.g., HS2950P) against lightning-induced surges and ESD in remote meters or robotics. IC Role / Device Role / Timing Role: Primary shunt protector upstream of the load switch's internal FET, limiting gate-source and drain-source overvoltage. Use Value: Keeps clamping voltage below the load switch's 30V VDS(max), avoiding destructive avalanche or gate oxide failure during 1kV/42Ω surges. |
| IoT Device Power Rail Protection | Notebook/Tablet DC Power Input Protection |
|
Use Scenario: Securing 12–24V DC input rails in battery-powered IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main power entry point before PMIC or battery charger IC. Use Value: Delivers 40A surge handling in <2.6mm² footprint - enables compact, certified designs meeting IEC 61000-4-5 Level 4 without external MOVs or cascaded TVS. |
Use Scenario: Protecting 19–20V adapter input rails in ultrabooks and tablets against accidental AC line transients and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary clamping device on DC jack or USB-C port VBus line, coordinated with low-capacitance TVS on data lanes. Use Value: Stable 27.5–28V clamping ensures system-level surge immunity without compromising adapter OVP thresholds or causing false shutdowns. |
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 code "T22" - direct Semtech-manufactured variant with same production lot traceability. | No functional difference; used interchangeably in USB PD and industrial designs where Semtech part numbering alignment is required. | Select TDS2211P.C when sourcing from authorized Semtech channels or requiring exact datasheet revision (Rev 2.5) and tape-and-reel packaging (3,000/reel). |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A; higher clamping, no constant-clamp behavior; 200W PPPK vs. 1120W for SC2442ITSTRT. | Limited to lower-energy transients; unsuitable for sustained 40A surges or high-temperature operation where clamping drift exceeds safe margins. | Choose SMAJ22A only for cost-sensitive, non-critical 22V rail protection where 35.5V clamping is acceptable and surge duty cycle is infrequent. |
Compared with TDS2211P.C (identical function and spec) and SMAJ22A (higher-clamp TVS), SC2442ITSTRT delivers superior surge robustness and thermal stability - enabling smaller, more reliable protection schemes in USB PD, industrial load switches, and portable power systems.
Availability
SC2442ITSTRT is available at Aetrix Electronics and suitable for USB Type-C Power Delivery, industrial load switch inputs, and IoT device power rail protection requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-2/4-4/4-5 standards.
Supply support for SC2442ITSTRT 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, and signal integrity.
The SC2442ITSTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 12–24V power rail protection where stable clamping and high surge endurance are critical.
FAQ
What is the maximum continuous operating voltage for SC2442ITSTRT?
The SC2442ITSTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC without significant leakage or conduction. This makes SC2442ITSTRT suitable for protecting 20V USB PD VBus lines and other 22V-rated power rails while maintaining low leakage (<600nA at 22V).
How does SC2442ITSTRT achieve constant clamping voltage across surge current?
SC2442ITSTRT uses a surge-rated FET activated by an integrated trigger circuit. As surge current increases, the FET's RDS(on) decreases, counteracting voltage rise - resulting in stable clamping of 27.5–28V from 24A to 40A. This differs fundamentally from TVS diodes, whose clamping rises linearly with current.
Can SC2442ITSTRT replace a standard TVS diode like SMAJ22A in existing designs?
SC2442ITSTRT is not a drop-in replacement for SMAJ22A due to different package (DFN-6 vs. DO-214AC), pin configuration, and circuit behavior. While both have 22V VRWM, SC2442ITSTRT offers lower clamping (28V vs. 35.5V) and higher surge rating (40A vs. 12.3A), but requires proper PCB layout with all six pins connected per datasheet guidelines.
What is the recommended PCB layout for optimal performance of SC2442ITSTRT?
Place SC2442ITSTRT as close as possible to the protected connector. Connect all three IN pins (4–6) via a single short, wide trace to the protected line, and tie all three GND pins (1–3) directly to a solid ground plane using ≥3 vias. Avoid thermal relief on GND pads and omit solder mask over the exposed pad to ensure low-inductance grounding.
Is SC2442ITSTRT compliant with environmental and safety standards?
Yes, SC2442ITSTRT is Pb-free, halogen-free, and RoHS/WEEE compliant. Its molding compound meets UL 94V-0 flammability rating. It is also qualified per IEC 61000-4-2 (±30kV ESD), IEC 61000-4-4 (±4kV EFT), and IEC 61000-4-5 (40A 8/20μs, ±1kV 1.2/50μs), making SC2442ITSTRT suitable for industrial and consumer safety-certified designs.
SC2442ITSTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.75V ~ 30V
- Frequency - Switching:
- 100kHz ~ 1.1MHz
- Duty Cycle (Max):
- 94%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SC2442ITSTRT FAQ
1.How can I place an order for SC2442ITSTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC2442ITSTRT 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 SC2442ITSTRT reliable?
The price and inventory of SC2442ITSTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC2442ITSTRT is usually 5 days.
3.What payment methods are accepted for SC2442ITSTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC2442ITSTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC2442ITSTRT?
SC2442ITSTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC2442ITSTRT 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 SC2442ITSTRT?
For technical support, including SC2442ITSTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC2442ITSTRT requirements.
6.How does Aetrix verify that SC2442ITSTRT is sourced from the original manufacturer or authorized distributors?
All SC2442ITSTRT 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 SC2442ITSTRT meets industry standards.
7.What is the process for return or replacement of SC2442ITSTRT?
All SC2442ITSTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC2442ITSTRT, 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 SC2442ITSTRT part is unused and in its original packaging.
Return procedure for SC2442ITSTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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