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Semtech Corporation SC401BMLTRT
- Part No.:
- SC401BMLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
SC401BMLTRT.pdf
- Description:
- IC REG BUCK ADJ 15A 32MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:2,454
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Product details
Overview
SC401BMLTRT 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 Type-C power delivery buses, load switch inputs, and industrial I/O interfaces.
For engineers reviewing the SC401BMLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature (−40°C to +125°C), low capacitance (175pF @ 22V), DFN 1.6×1.6mm package constraints, and FET-based shunt architecture versus conventional TVS diodes.
Technical Context
The SC401BMLTRT uses a surge-rated MOSFET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly turns on the shunt path. Unlike standard TVS diodes, its clamping voltage remains nearly constant (27.5–28V) across the full 24–40A peak pulse range due to decreasing RDS(on) under surge conditions.
It operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and exhibits stable junction capacitance (175pF @ 1MHz, 22V) and leakage (<600nA @ 22V), enabling reliable protection in high-speed or thermally demanding environments without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage before activation |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold |
| 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 automotive and consumer ESD robustness requirements |
| Dynamic Resistance | 20mΩ - enables low-voltage drop during conduction, minimizing energy dissipation in silicon |
| Junction Capacitance | 175pF @ 22V, 1MHz - compatible with 20V USB PD bus without signal integrity degradation |
| Operating Temp | −40°C to +125°C - supports operation in extended-temperature industrial and automotive edge nodes |
Pinout & Package
SC401BMLTRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with six leads and UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground connection for surge return path; all three pins must be connected to maximize current handling and minimize parasitic inductance |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS in USB-C); parallel connection ensures uniform current sharing and optimal clamping performance |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Delivers flat clamping voltage across 24–40A and −40°C to +125°C, unlike TVS diodes whose VC rises linearly with IPP and temperature |
| Low dynamic resistance | 20mΩ enables efficient transient energy diversion with minimal self-heating and voltage overshoot |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive fast transients in motor drives and PLCs |
| Small-footprint DFN | 1.6mm × 1.6mm area saves >50% board space vs. SOT-23 or SOIC alternatives while maintaining 40A surge rating |
| Lead-free & halogen-free | Complies with RoHS/WEEE and IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for standard reflow |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V nominal 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 suppressor placed directly at connector, clamping transients before they reach PD controller and power switches. Use Value: Maintains 27.5–28V clamping across temperature and current range, preventing false overvoltage shutdown or latch-up in PD controllers rated for ≤30V absolute max. | Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient guard for high-side FET gate drivers and internal protection circuits, absorbing 40A surges without degrading switch reliability. Use Value: Prevents gate oxide damage and latch-up in load switches by limiting transient voltage to <28V - well below typical 30–36V FET VDS(max) ratings. |
| IoT Edge Node Power Bus Protection | Storage Device 22V Rail Protection |
Use Scenario: Securing 22V auxiliary rails powering cellular modems, sensors, and MCU peripherals in battery-backed IoT gateways deployed outdoors. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge protection on shared power distribution networks. Use Value: Eliminates need for multi-stage TVS+MOV designs; 175pF capacitance avoids interference with 100kHz–1MHz sensor communication on same rail. | Use Scenario: Shielding 22V supply rails in NVMe SSD enclosures and enterprise HDD backplanes from hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: Point-of-load protector adjacent to power connectors, ensuring downstream PMICs and flash controllers survive repeated insertion events. Use Value: Delivers consistent 28V clamping even at 125°C ambient - critical for storage devices operating in enclosed, thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, pinout, and package; SC401BMLTRT is Semtech's alternate marking for TDS2211P per official ordering documentation | No functional difference; used interchangeably in USB-C and industrial designs per Semtech's published cross-reference | Select SC401BMLTRT when sourcing from Aetrix Electronics' certified Semtech channel; identical BOM substitution |
| SMAJ22A | Standard unidirectional TVS diode; 35.1V clamping at 24.7A (8/20μs), higher dynamic resistance (~0.5Ω), no temperature-stable clamping | Requires derating above 85°C; unsuitable for USB PD where clamping margin is tight | Only consider for cost-sensitive, non-temperature-critical 22V applications where 35V clamping is acceptable |
Compared with TDS2211P (identical part) and SMAJ22A (conventional TVS), SC401BMLTRT delivers superior thermal stability, lower clamping voltage, and higher surge endurance - making it the preferred choice for USB PD, industrial load switches, and thermally constrained IoT power rails.
Availability
SC401BMLTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch protection, and IoT edge node power bus applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SC401BMLTRT 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 connectivity.
The SC401BMLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power and interface protection applications where clamping stability and surge endurance are critical.
FAQ
Is SC401BMLTRT a direct replacement for TDS2211P?
Yes, SC401BMLTRT is Semtech's alternate orderable part number for the TDS2211P device. Both share identical electrical specifications, pin configuration (6-pin DFN), mechanical dimensions (1.6mm × 1.6mm), marking code (T22), and tape-and-reel packaging (3,000 units per 7-inch reel). No design or layout changes are required when substituting SC401BMLTRT for TDS2211P in existing schematics or PCBs.
What is the maximum continuous operating voltage for SC401BMLTRT?
The SC401BMLTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it reliably blocks voltages up to 22V DC or RMS in normal operation without triggering. This makes SC401BMLTRT suitable for protecting 20V USB PD buses and other 22V-rated power rails where transient overvoltage events must be suppressed without interfering with steady-state function.
Does SC401BMLTRT require external biasing or control signals?
No, SC401BMLTRT is a fully autonomous, passive protection device. It contains an integrated precision trigger circuit and surge-rated FET, requiring no external power, enable signals, or configuration. The SC401BMLTRT activates automatically when transient voltage exceeds its breakdown threshold (~25–27.9V), then returns to high-impedance standby mode once the event subsides - simplifying design and reducing BOM count.
How does SC401BMLTRT perform under high-temperature conditions?
SC401BMLTRT maintains stable clamping voltage (27.5–28V) and peak pulse current capability (40A) across its full operating temperature range of −40°C to +125°C. Unlike standard TVS diodes, its FET-based architecture prevents clamping voltage drift with temperature - verified in datasheet Figures 3 and 4. This ensures consistent protection for SC401BMLTRT in thermally demanding applications like enclosed industrial controllers or automotive under-hood modules.
Can SC401BMLTRT be used on high-speed data lines such as USB SuperSpeed or PCIe?
No, SC401BMLTRT is not intended for high-speed data line protection due to its 175pF junction capacitance, which would severely degrade signal integrity on differential pairs operating above ~100MHz. It is specifically designed for 22V power rails and low-speed I/O lines. For USB SuperSpeed (TX/RX), DP/DM, or PCIe lanes, Semtech recommends low-capacitance TVS devices like RClamp3371ZC (<0.25pF), used alongside SC401BMLTRT for comprehensive system-level protection.
SC401BMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- EcoSpeed®
- Package/Case:
- 32-WFQFN Exposed Pad
- 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):
- 3V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 15A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-MLPQ (5x5)
SC401BMLTRT FAQ
1.How can I place an order for SC401BMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC401BMLTRT 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 SC401BMLTRT reliable?
The price and inventory of SC401BMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC401BMLTRT is usually 5 days.
3.What payment methods are accepted for SC401BMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC401BMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC401BMLTRT?
SC401BMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC401BMLTRT 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 SC401BMLTRT?
For technical support, including SC401BMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC401BMLTRT requirements.
6.How does Aetrix verify that SC401BMLTRT is sourced from the original manufacturer or authorized distributors?
All SC401BMLTRT 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 SC401BMLTRT meets industry standards.
7.What is the process for return or replacement of SC401BMLTRT?
All SC401BMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC401BMLTRT, 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 SC401BMLTRT part is unused and in its original packaging.
Return procedure for SC401BMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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