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Semtech Corporation SC403BMLTRT
- Part No.:
- SC403BMLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
SC403BMLTRT.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 32MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:1,639
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Product details
Overview
SC403BMLTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping across temperature and current range. It protects USB Type-C power delivery buses and load switch inputs in industrial and IoT equipment.
For engineers reviewing the SC403BMLTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection design.
Technical Context
The SC403BMLTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike standard TVS diodes, its clamping voltage remains nearly constant - ~27.6V at 40A and stable from –40°C to +125°C - due to the FET's ultra-low dynamic resistance (20mΩ).
It operates with a 22V reverse stand-off voltage (VRWM), 25–27.9V breakdown (VBR), and only 130–600nA leakage at VRWM. Its 175pF junction capacitance at 22V/1MHz makes it suitable for DC power and low-speed signal line protection, but not high-speed data lanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V VRWM - defines maximum continuous operating voltage before clamping activation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage thresholds. |
| 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 industrial ESD requirements. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimal voltage rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for power rail and medium-speed control line protection. |
| Operating Temp | –40°C to +125°C - supports deployment in harsh environments without derating. |
Pinout & Package
SC403BMLTRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and UL 94V-0 molding compound. All pins must be connected to achieve rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; requires low-inductance PCB connection via multiple vias. |
| Pins 4, 5, 6 | IN | Protected line input - all three pins must be tied together to the same bus for full 40A rating and optimal thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping architecture | Delivers near-constant clamping voltage (27.5–28V) across 1–40A surge range and –40°C to +125°C. |
| Low dynamic resistance | 20mΩ enables minimal voltage overshoot during fast-rising transients, reducing stress on downstream FETs. |
| High-energy surge handling | 1120W peak pulse power (8/20μs) supports robust protection against lightning-induced surges in industrial systems. |
| Ultra-low leakage | ≤600nA at 22V ensures negligible standby power loss and no impact on battery-powered IoT device runtime. |
| Compact DFN footprint | 1.6mm × 1.6mm saves >50% board area vs. legacy 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 VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch. Use Value: Maintains 27.6V clamping at 40A and 125°C - well below typical PD controller absolute max rating (30–33V) - eliminating thermal derating concerns. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient suppressor preventing gate oxide damage and latch-up in integrated FETs. Use Value: Clamps surges before they reach the load switch's internal driver, preserving OVP/UVLO functionality and enabling reliable hot-swap operation. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary rails powering cellular modems or sensors in outdoor gateways. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge immunity per IEC 61000-4-2/4/5. Use Value: Eliminates need for multi-stage protection (TVS + MOV + filter), reducing BOM count and PCB area while improving reliability. |
Use Scenario: Protecting 22V supercapacitor or LiFePO₄ backup supplies in SSDs and NAS enclosures. IC Role / Device Role / Timing Role: Low-leakage (≤600nA), low-capacitance (175pF) protector preserving hold-up time and signal integrity. Use Value: Prevents catastrophic failure during hot-plug events or power rail faults without degrading backup energy retention. |
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, and 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 directly from Semtech or authorized distributors with full traceability. |
| uClamp2411ZA.TCT | 24V VRWM, lower 20A IPP rating, higher 33V clamping at 20A, and smaller 1.0mm × 0.6mm DFN-2 package. | Suitable only for CC/SBU lines or low-power 24V rails - insufficient for 40A surge or main VBUS protection. | Choose uClamp2411ZA.TCT only for space-constrained, lower-energy protection where 22V working voltage margin is acceptable. |
Compared with SC403BMLTRT, TDS2211P.C offers identical performance and form factor with full manufacturer validation, while uClamp2411ZA.TCT trades surge capability and clamping precision for ultra-small size - making it complementary rather than substitutable in main power rail roles.
Availability
SC403BMLTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for SC403BMLTRT 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 SC403BMLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping and temperature insensitivity are critical.
FAQ
What is the exact package type and dimensions of SC403BMLTRT?
SC403BMLTRT uses a 6-lead DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed pad-less construction and UL 94V-0 flammability rating. Pin 1 is marked with a laser dot, and the device is supplied in tape-and-reel format with 3,000 units per 7-inch reel. This footprint matches Semtech's TDS2211P.C and enables direct PCB layout reuse.
Does SC403BMLTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC403BMLTRT is rated for 40A peak pulse current with an 8/20μs waveform per IEC 61000-4-5, and supports ±1kV combination wave testing (1.2/50μs voltage, 8/20μs current, RS = 42Ω). Its 1120W peak pulse power rating confirms compliance with Level 4 industrial surge requirements when properly laid out on PCB.
How does SC403BMLTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with surge current (VC = VBR + IPP × RDYN), SC403BMLTRT uses a triggered FET to maintain 27.5–28V clamping from 1A to 40A and across –40°C to +125°C. This eliminates thermal derating and ensures consistent protection margins for sensitive USB PD controllers and load switches.
Can SC403BMLTRT be used on high-speed data lines like USB SuperSpeed or PCIe?
No, SC403BMLTRT is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V would severely degrade signal integrity on differential pairs operating above ~100Mbps. For USB SS, DP/DM, or PCIe lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), which are designed specifically for those interfaces.
What is the maximum continuous operating voltage for SC403BMLTRT?
The maximum continuous operating voltage for SC403BMLTRT is 22V (VRWM), verified per datasheet Section 3. This value represents the highest DC or RMS voltage the device can withstand without entering breakdown or exhibiting excessive leakage (>600nA). Operating above 22V risks premature conduction and potential failure.
SC403BMLTRT 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)
SC403BMLTRT FAQ
1.How can I place an order for SC403BMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC403BMLTRT 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 SC403BMLTRT reliable?
The price and inventory of SC403BMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC403BMLTRT is usually 5 days.
3.What payment methods are accepted for SC403BMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC403BMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC403BMLTRT?
SC403BMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC403BMLTRT 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 SC403BMLTRT?
For technical support, including SC403BMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC403BMLTRT requirements.
6.How does Aetrix verify that SC403BMLTRT is sourced from the original manufacturer or authorized distributors?
All SC403BMLTRT 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 SC403BMLTRT meets industry standards.
7.What is the process for return or replacement of SC403BMLTRT?
All SC403BMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC403BMLTRT, 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 SC403BMLTRT part is unused and in its original packaging.
Return procedure for SC403BMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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