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Semtech Corporation SC424MLTRT
- Part No.:
- SC424MLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
SC424MLTRT.pdf
- Description:
- IC REG DL BUCK/LINEAR 28MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:3,028
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Product details
Overview
SC424MLTRT 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 40A, and 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SC424MLTRT datasheet, pinout, applications, or equivalent options, this device delivers stable clamping across temperature and current range - critical for protecting USB PD controllers, e-fuses, and 22V bus interfaces where conventional TVS diodes exhibit rising VC with IPP and temperature.
Technical Context
The SC424MLTRT 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. Its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to sub-20mΩ dynamic resistance and low RDS(on) behavior under surge conditions.
Unlike standard TVS diodes governed by VC = VBR + IPP × RDYN, the SC424MLTRT maintains stable clamping over −40°C to +125°C and across full rated current - verified by test data showing <0.5V variation in VC from −40°C to +125°C at 40A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common PD controllers and load switches. |
| 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. |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with DC/low-speed power line protection; not for >100MHz signal lines. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimizes voltage overshoot during fast transients. |
| Operating Temperature | −40°C to +125°C - supports extended-range industrial and automotive under-hood applications. |
Pinout & Package
SC424MLTRT is housed in a RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All pins must be connected for full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path; all three must be soldered to PCB ground plane with multiple vias to minimize inductance. |
| Pins 4, 5, 6 | IN | Protected line input; tied together externally to connect to VBUS or power rail - parallel connection ensures current sharing and full IPP rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <0.5V from −40°C to +125°C at 40A - eliminates thermal derating calculations required for TVS diodes. |
| Surge-rated FET protection element | Replaces PN-junction TVS with low-RDS(on) switch - reduces thermal stress and improves reliability under repeated surges. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against burst noise in motor drives and PLC environments. |
| Low leakage | 600nA max reverse leakage at 22V - avoids system standby current penalties in battery-powered IoT devices. |
| Space-efficient packaging | 1.6mm × 1.6mm footprint - saves >60% board area vs. SO-8 or SOT-23 TVS solutions rated for equivalent surge energy. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C receptacles supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or buck converter input. Use Value: Maintains 27.5–28V clamping at full 40A surge - prevents latch-up or gate oxide damage in PD controllers rated for <30V absolute max. |
Use Scenario: Front-end protection for HS2950P or similar e-fuse/load switches in remote meters and robotics. IC Role / Device Role / Timing Role: Transient voltage limiter on VIN pin to prevent overvoltage failure of internal FET and OVP circuitry. Use Value: Clamps below 28V across temperature - keeps load switch within safe operating area (SOA) during lightning-induced surges. |
| IoT Edge Node Power Bus Protection | Storage Device 22V Rail Protection |
Use Scenario: Securing 22V auxiliary rails in battery-backed smart sensors and gateway modules exposed to field ESD. IC Role / Device Role / Timing Role: Single-point, low-capacitance (<200pF) surge diverter on main power input before PMIC. Use Value: Delivers ±30kV ESD robustness without adding significant leakage or thermal overhead - extends battery life in always-on nodes. |
Use Scenario: Protecting 22V bias rails in NVMe SSD enclosures and enterprise HDD backplanes subject to hot-swap transients. IC Role / Device Role / Timing Role: High-energy transient suppressor on DC input stage upstream of DC-DC converters and LDOs. Use Value: Handles 1120W peak pulse power without degradation - sustains reliability through repeated hot-plug cycles in datacenter environments. |
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 | Same die, identical electrical specs, identical DFN-6 package - direct manufacturer-recommended replacement with same marking (T22). | No functional difference; used interchangeably in production with identical layout and BOM impact. | Select TDS2211P.C when sourcing from Semtech's official distribution channel with full traceability and warranty coverage. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 22.5A - higher clamping, no temperature stability, fixed RDYN ≈ 0.5Ω. | Requires derating above 85°C; unsuitable for applications demanding <29V clamping at full temperature range. | Choose SMAJ22A only for cost-sensitive, non-critical 22V lines where clamping voltage margin >7V is acceptable. |
Compared with TDS2211P.C (identical performance) and SMAJ22A (higher VC, temperature-sensitive clamping), SC424MLTRT provides guaranteed 27.5–28V clamping across −40°C to +125°C and 24–40A - enabling simplified thermal design and eliminating worst-case VC margin stacking in safety-critical 22V systems.
Availability
SC424MLTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, IoT edge node power buses, and storage device 22V rails requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC424MLTRT 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, power management, and transient protection.
The SC424MLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered to replace conventional TVS diodes in high-reliability 20–30V power rail protection where flat clamping and temperature stability are mandatory.
FAQ
What is the exact clamping voltage specification for SC424MLTRT at 40A?
The SC424MLTRT clamps at 27.6–28.0V under 40A peak pulse current (tp = 1.2/50μs voltage / 8/20μs current combination waveform, RS = 2Ω), as specified in the Electrical Characteristics table of the official Semtech datasheet Rev 2.5. This value is guaranteed across −40°C to +125°C and reflects the device's constant-clamp architecture using a surge-rated FET.
Is SC424MLTRT pin-compatible with TDS2211P.C?
Yes - SC424MLTRT and TDS2211P.C share identical DFN 1.6mm × 1.6mm × 0.55mm 6-lead packaging, identical pin configuration (Pins 1–3 = GND, Pins 4–6 = IN), and identical electrical specifications. They are functionally and mechanically interchangeable with no PCB layout changes required.
Can SC424MLTRT protect high-speed data lines like USB SS or PCIe?
No - SC424MLTRT has 175pF junction capacitance at 22V, making it unsuitable for high-speed differential data lines (e.g., USB SuperSpeed, PCIe, HDMI). It is designed exclusively for DC or low-frequency power and control lines. For data line protection, Semtech recommends RClamp3371ZC (0.25pF) alongside SC424MLTRT in full USB-C solutions.
Does SC424MLTRT require a thermal pad or heatsink on the PCB?
No - the SC424MLTRT dissipates surge energy in its silicon FET structure, not via junction-to-case conduction. The datasheet explicitly states "no thermal pad is needed," and the DFN package lacks an exposed thermal pad. Layout focuses on low-inductance GND vias and short IN traces - not thermal mass.
What is the maximum continuous reverse leakage current for SC424MLTRT at 22V?
The maximum reverse leakage current for SC424MLTRT is 600nA at VRWM = 22V and TA = 25°C, as confirmed in the Electrical Characteristics table. Leakage remains below 900nA across the full −40°C to +125°C operating range, ensuring minimal impact on battery drain in always-on IoT applications.
SC424MLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- SmartDrive™
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 200kHz ~ 1MHz
- Voltage/Current - Output 1:
- Adj to 0.75V, 6A
- Voltage/Current - Output 2:
- 5V, 150mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-MLPQ (4x4)
SC424MLTRT FAQ
1.How can I place an order for SC424MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC424MLTRT 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 SC424MLTRT reliable?
The price and inventory of SC424MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC424MLTRT is usually 5 days.
3.What payment methods are accepted for SC424MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC424MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC424MLTRT?
SC424MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC424MLTRT 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 SC424MLTRT?
For technical support, including SC424MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC424MLTRT requirements.
6.How does Aetrix verify that SC424MLTRT is sourced from the original manufacturer or authorized distributors?
All SC424MLTRT 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 SC424MLTRT meets industry standards.
7.What is the process for return or replacement of SC424MLTRT?
All SC424MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC424MLTRT, 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 SC424MLTRT part is unused and in its original packaging.
Return procedure for SC424MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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