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Semtech Corporation SC220QSTRT
- Part No.:
- SC220QSTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SC220QSTRT.pdf
- Description:
- IC REG BUCK ADJ 650MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,647
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Product details
Overview
SC220QSTRT from Semtech is a transient diverting suppressor 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 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC220QSTRT datasheet, pinout, applications, or equivalent options, this device offers stable clamping across temperature and current-critical for protecting 22V bus interfaces where conventional TVS diodes exhibit rising VC with IPP and temperature.
Technical Context
The SC220QSTRT 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 due to decreasing RDS(on) under surge, not fixed RDYN.
It operates over –40°C to +125°C, maintains 27.5–28V clamping from 24A to 40A (1.2/50μs + 8/20μs combo waveform, RS = 2Ω), and delivers 1120W peak pulse power. Its 175pF junction capacitance at 22V/1MHz supports low-speed power-line protection without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD VBus and industrial 24V rail derating requirements. |
| Clamping Voltage | 27.5–28V at 40A - stays flat across full rated current, enabling predictable downstream IC protection. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD test requirements. |
| Dynamic Resistance | 20mΩ - ensures minimal IR drop during surge, preserving clamping stability. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for DC power and low-speed control lines, not high-speed data. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - enables ultra-compact placement near connectors with minimal PCB area. |
Pinout & Package
SC220QSTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm package with exposed thermal pad not required (energy dissipated in silicon). All six terminals are electrically active: three GND pins (1–3) and three IN pins (4–6), requiring parallel connection for full 40A rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to minimize inductance and maximize current sharing. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus); parallel connection ensures uniform current distribution and full 40A capability. |
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. |
| Temperature-stable protection | Clamping remains ~27.5–28V from –40°C to +125°C - removes thermal derating calculations for industrial deployments. |
| High-energy surge handling | 1120W peak pulse power (8/20μs) - sustains repeated surges without degradation, unlike Zener-based TVS. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - minimizes voltage overshoot during fast-rising transients. |
| Compact DFN layout | 1.6 × 1.6 mm footprint - saves >60% board space vs. SO-8 or SOT-23 TVS solutions with comparable ratings. |
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 ESD, lightning-induced surges, and connector hot-plug transients. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, shunting EOS energy to ground before it reaches the PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping across –40°C to +125°C and 24–40A, preventing PD controller latch-up or gate oxide damage where TVS devices exceed safe thresholds at elevated temperatures. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes exposed to 1kV/42Ω surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary front-end protector for the VIN pin of integrated load switches, limiting transient voltage below the internal FET's absolute maximum rating. Use Value: Prevents destructive failure of the load switch's integrated MOSFET by clamping at 28V - well below typical 30–36V VDS(max) limits - even during 40A surges at 125°C. |
| Notebook/Tablet DC Power Input Protection | Industrial 24V Rail Surge Suppression |
|
Use Scenario: Securing the main DC input (e.g., barrel jack or USB-C PD port) of portable computing devices against user-handled ESD and accidental AC line coupling. IC Role / Device Role / Timing Role: Standalone EOS protector on the primary power rail, upstream of buck converters and battery charge management ICs. Use Value: Delivers ±30kV ESD robustness and 40A surge capacity in a 1.6mm² footprint - enabling thinner chassis designs without sacrificing reliability certification margins. |
Use Scenario: Hardening 24V auxiliary rails in programmable logic controllers (PLCs), motor drives, and factory automation I/O modules against induced surges from relay switching or nearby lightning. IC Role / Device Role / Timing Role: Point-of-entry protector on distributed 24V supply lines feeding sensors, actuators, and communication interfaces. Use Value: Provides repeatable 28V clamping at full 40A rating - ensuring downstream 24V-rated ICs (e.g., RS-485 transceivers, ADC references) remain within safe operating area during repetitive surge events. |
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), same Semtech datasheet Rev 2.5 - confirmed pin-to-pin and functional replacement. | No difference; validated for identical USB PD, load switch, and 22V rail use cases. | Select TDS2211P.C if sourcing directly from Semtech or authorized distributors with full traceability. |
| SMAJ22A | Zener TVS diode: 22V VRWM, 35.5V VC @ 12.5A, 100mΩ RDYN - clamping rises sharply with current/temperature; 5.6× larger SMC package. | Requires larger layout, higher clamping margin, and thermal derating above 85°C - less suitable for compact, thermally constrained designs. | Choose SMAJ22A only for cost-sensitive, non-temperature-critical 22V protection where board space is not constrained. |
Compared with SC220QSTRT, TDS2211P.C offers identical performance and fit; SMAJ22A provides lower cost but sacrifices clamping stability, temperature resilience, and board-area efficiency - making SC220QSTRT optimal for space-constrained, high-reliability 22V EOS protection.
Availability
SC220QSTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and notebook/tablet DC power protection requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC220QSTRT 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.
The SC220QSTRT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered to replace conventional TVS diodes in high-reliability 22V power-line protection where flat clamping and temperature stability are mandatory.
FAQ
What is the maximum clamping voltage of SC220QSTRT at 40A surge current?
The SC220QSTRT clamps at 27.5–28V under 40A peak pulse current (tp = 8/20μs, 1.2/50μs combo waveform, RS = 2Ω), with minimal variation across temperature (–40°C to +125°C). This flat clamping behavior is enabled by its FET-based architecture, not achievable with standard TVS diodes.
Is SC220QSTRT pin-compatible with TDS2211P.C?
Yes, SC220QSTRT is pin-compatible and functionally identical to TDS2211P.C: both use the same DFN-6 1.6 × 1.6 mm package, share identical pinout (GND on pins 1–3, IN on pins 4–6), and meet identical electrical specifications per Semtech Rev 2.5 datasheet.
Can SC220QSTRT protect high-speed data lines like USB SuperSpeed?
No, SC220QSTRT is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V would severely degrade signal integrity on USB 3.x, PCIe, or HDMI lines. It is intended exclusively for DC power rails and low-speed control lines such as USB PD VBus, CC, or load switch enable inputs.
What is the recommended PCB layout for SC220QSTRT to achieve full 40A rating?
To achieve the full 40A rating, connect all three IN pins (4–6) via a single short, wide trace to the protected line, and all three GND pins (1–3) to a solid ground plane using multiple vias. Place SC220QSTRT within 2 mm of the connector to minimize inductive coupling - layout guidelines are specified in Semtech's TDS2211P datasheet Figure 7.
Does SC220QSTRT require a thermal pad or heatsink for surge dissipation?
No, SC220QSTRT does not require a thermal pad or external heatsink. Its surge energy is dissipated internally in the silicon FET structure, and the DFN package is designed for direct PCB copper conduction. The datasheet explicitly states "no thermal pad is needed" - thermal management relies on PCB copper area, not package-level heatsinking.
SC220QSTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- X-EMI™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 650mA
- Frequency - Switching:
- 20MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SC220QSTRT FAQ
1.How can I place an order for SC220QSTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC220QSTRT 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 SC220QSTRT reliable?
The price and inventory of SC220QSTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC220QSTRT is usually 5 days.
3.What payment methods are accepted for SC220QSTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC220QSTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC220QSTRT?
SC220QSTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC220QSTRT 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 SC220QSTRT?
For technical support, including SC220QSTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC220QSTRT requirements.
6.How does Aetrix verify that SC220QSTRT is sourced from the original manufacturer or authorized distributors?
All SC220QSTRT 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 SC220QSTRT meets industry standards.
7.What is the process for return or replacement of SC220QSTRT?
All SC220QSTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC220QSTRT, 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 SC220QSTRT part is unused and in its original packaging.
Return procedure for SC220QSTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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