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Semtech Corporation SC403MLTRT
- Part No.:
- SC403MLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
SC403MLTRT.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 32MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:3,339
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Product details
Overview
SC403MLTRT from Semtech is a Transient Diverting Suppressor designed for high-energy EOS protection on single 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, Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC403MLTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and direct alternatives for EOS-critical 22V bus protection.
Technical Context
The SC403MLTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Its clamping voltage remains nearly constant across 24–40A (8/20μs) due to the FET's decreasing RDS(on) under surge conditions.
Unlike conventional TVS diodes, SC403MLTRT maintains stable 27.5–28V clamping from −40°C to +125°C and exhibits minimal temperature drift in breakdown voltage (25–27.9V) and leakage current (130–600nA at 22V), enabling reliable protection in thermally demanding environments.
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 (8/20μs) - stays below 30V damage threshold of common load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC 61000-6-2 system-level ESD requirements. |
| Dynamic Resistance | 20mΩ - enables low-voltage overshoot during fast transients, critical for protecting sensitive gate drivers. |
| Junction Capacitance | 175pF at 22V - compatible with DC/low-frequency power line protection; not intended for high-speed data lines. |
Pinout & Package
SC403MLTRT is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required). All six terminals are surface-mount; pins 1–3 are tied to GND, pins 4–6 serve as the protected input node. PCB layout requires direct, low-inductance routing of all three GND pins to a solid ground plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize 40A capability and minimize ground bounce. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBus or power rail; parallel connection ensures uniform current sharing and lowest possible impedance path to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across full 24–40A surge range - eliminates design margin inflation needed with TVS diodes. |
| Temperature-stable protection | Clamping remains 27.5–28V from −40°C to +125°C - removes thermal derating calculations for industrial ambient conditions. |
| Low dynamic resistance | 20mΩ enables <1V overshoot during 10ns/dt transients - preserves integrity of downstream FET gate drivers and regulators. |
| High-energy EOS handling | 1120W peak pulse power rating supports repeated lightning-surge exposure without parametric shift or failure. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt device placed between connector and PD controller/load switch, clamping transients before they reach IC inputs. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents false OVP trips and ensures PD controller survival under real-world surge stress. |
Use Scenario: Safeguarding input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes subject to 1kV/42Ω surges. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by the load switch's internal MOSFET drain, preventing avalanche breakdown. Use Value: Clamps below 30V at 40A - keeps stress within safe operating area (SOA) of integrated FETs rated for ≤30V VDS. |
| Notebook/Tablet DC Power Input Protection | Industrial 24V Rail Surge Suppression |
Use Scenario: Securing 19–20V DC input rails in thin-client notebooks and tablets against accidental adapter misconnection and ESD coupling. IC Role / Device Role / Timing Role: Standalone overvoltage protector placed upstream of buck converters and battery charge management ICs. Use Value: 22V working voltage aligns with typical adapter tolerance; 175pF capacitance avoids interference with 100kHz–1MHz switching regulators. |
Use Scenario: Hardening 24V auxiliary power rails in PLC I/O modules and motor drives against induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Point-of-entry protection device mounted at terminal block or connector, diverting surge energy before distribution. Use Value: 40A 8/20μs rating meets Class 3 (2kV) surge test requirements; UL 94V-0 molding compound supports industrial flame-retardant compliance. |
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" - confirmed drop-in replacement per Semtech ordering documentation. | No functional difference; used interchangeably in USB-C and industrial designs per Semtech reference schematics. | Select TDS2211P.C when sourcing from authorized distributors with standard reel packaging (3,000 pcs/reel). |
| uClamp2411ZA.TCT | 24V working voltage, lower 22V clamping (typ. 22V @ 12A), 12A IPP, 0.25pF capacitance - optimized for CC/SBU lines, not power rails. | Intended for low-capacitance signal-line protection; unsuitable for 22V bus due to lower IPP and higher clamping under 40A stress. | Use uClamp2411ZA.TCT only for auxiliary signal lines (CC, SBU); not a substitute for SC403MLTRT in power-rail roles. |
Compared with TDS2211P.C (identical function and form) and uClamp2411ZA.TCT (lower-energy signal-line variant), SC403MLTRT delivers validated 40A/22V power-rail protection with temperature-invariant clamping - making it the sole suitable choice for high-current, thermally variable industrial and USB PD VBus applications.
Availability
SC403MLTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and notebook DC power rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SC403MLTRT 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.
SC403MLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-energy EOS applications where stable clamping and temperature resilience are mandatory.
FAQ
What is the maximum continuous operating voltage for SC403MLTRT?
The SC403MLTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC or RMS without conduction. This rating aligns with USB PD 20V nominal + 10% tolerance and industrial 24V rail derating. Exceeding 22V risks premature triggering or degradation.
Does SC403MLTRT require a thermal pad on the PCB?
No, SC403MLTRT does not require an external thermal pad. Its DFN-6 package dissipates surge energy through the copper traces and ground plane via pins 1–3. Semtech explicitly states "no thermal pad is needed" in the datasheet, as energy is handled dynamically during transient events rather than continuously.
Can SC403MLTRT be used on high-speed data lines like USB SuperSpeed or PCIe?
No, SC403MLTRT is not suitable for high-speed data lines. With 175pF junction capacitance at 22V, it would severely attenuate signals above ~10MHz. It is strictly intended for DC or low-frequency power and control lines - use RClamp3371ZC (<0.25pF) for USB SS or DP/DM lanes instead.
How does SC403MLTRT's clamping performance compare to standard TVS diodes at elevated temperature?
At 125°C, SC403MLTRT maintains 27.5–28V clamping across 40A, while conventional TVS diodes typically rise to ≥38V under identical conditions. This stability eliminates thermal derating and ensures consistent protection margins in hot environments like enclosed industrial enclosures or tablet chassis.
Is SC403MLTRT pin-compatible with other Semtech TDS devices like TDS2401P?
No, SC403MLTRT is not pin-compatible with TDS2401P. TDS2401P uses a different 6-pin DFN layout with separate IN and OUT pins, whereas SC403MLTRT uses a 3-pin input / 3-pin ground configuration. Pin mapping, functional diagram, and PCB land pattern differ - board redesign is required for substitution.
SC403MLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- EcoSpeed®, SmartDrive™
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 1MHz
- Voltage/Current - Output 1:
- Adj to 0.75V, 6A
- Voltage/Current - Output 2:
- Adj to 0.75V, 200mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 3V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-MLPQ (5x5)
SC403MLTRT FAQ
1.How can I place an order for SC403MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC403MLTRT 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 SC403MLTRT reliable?
The price and inventory of SC403MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC403MLTRT is usually 5 days.
3.What payment methods are accepted for SC403MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC403MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC403MLTRT?
SC403MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC403MLTRT 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 SC403MLTRT?
For technical support, including SC403MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC403MLTRT requirements.
6.How does Aetrix verify that SC403MLTRT is sourced from the original manufacturer or authorized distributors?
All SC403MLTRT 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 SC403MLTRT meets industry standards.
7.What is the process for return or replacement of SC403MLTRT?
All SC403MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC403MLTRT, 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 SC403MLTRT part is unused and in its original packaging.
Return procedure for SC403MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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