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Semtech Corporation SC4624AMLTRT
- Part No.:
- SC4624AMLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SC4624AMLTRT.pdf
- Description:
- IC REG BUCK ADJ 4A 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:2,722
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Product details
Overview
SC4624AMLTRT 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 a stable 27.5–28V clamping voltage across temperature and current range. Used in USB Type-C PD input protection to safeguard controllers from bus overvoltage.
For engineers reviewing the SC4624AMLTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and validated alternative parts with functional distinctions.
Technical Context
The SC4624AMLTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit upon detection of overvoltage. Unlike conventional TVS diodes, its clamping voltage remains nearly constant - ~27.5–28V at both 24A and 40A - due to decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and 20mΩ dynamic resistance (8/20μs). The device is rated for 1120W peak pulse power and meets IEC 61000-4-4 (±4kV EFT) and IEC 61000-4-5 (±1kV unsymmetrical line surge).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surge. |
| Peak Pulse Current | 40A (8/20μs) - supports compliance with industrial ±1kV surge (IEC 61000-4-5, RS = 42Ω, CS = 0.5μF). |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD stages in portable USB-C designs. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for 20V power rail protection without affecting transient response or stability. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables flat clamping curve and minimizes voltage overshoot during fast-rising surges. |
Pinout & Package
SC4624AMLTRT is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required. All six terminals are electrically active: three parallel GND pins and three parallel IN pins - mandatory connection of all pins is required to achieve rated 40A surge capability and minimize parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to PCB ground plane via multiple vias to reduce inductance. |
| 4, 5, 6 | IN | Input terminal tied to protected bus (e.g., VBUS in USB-C); all three pins conduct surge current in parallel to maximize current handling. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A - eliminates design margin inflation needed with traditional TVS diodes. |
| FET-based shunt topology | Dissipates energy in low-RDS(on) channel instead of PN junction - enables stable performance up to +125°C ambient. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - reduces voltage overshoot during sub-100ns ESD transients. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - exceeds IEC 61000-4-5 Level 4 requirements for industrial equipment. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB-C receptacles supporting up to 20V/5A PD negotiation, exposed to lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS suppressor placed directly at connector, clamping transients before they reach USB PD controller or load switch. Use Value: Maintains 27.5–28V clamping across −40°C to +125°C - avoids derating and guarantees controller survival where standard TVS would exceed 35V at high temperature. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways subjected to 42Ω/0.5μF surge coupling. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by internal FET gate oxide and drain-source junction. Use Value: Prevents catastrophic failure of load switch due to VDS overvoltage - enables use of cost-optimized switches without integrated surge hardening. |
| Notebook/Tablet VBUS Rail Protection | Storage Device Power Bus Protection |
|
Use Scenario: Securing 20V VBUS rails in ultrabooks and tablets against ESD from user-accessible ports and conducted surges from AC adapters. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV networks, minimizing board space in thin form factors. Use Value: 1.6mm × 1.6mm footprint saves >60% area vs. SOD-123 TVS alternatives - critical for height-constrained mobile PCBs. |
Use Scenario: Protecting 12–22V power inputs of NVMe SSDs and external HDD enclosures against ESD during hot-swap and surge events in data centers. IC Role / Device Role / Timing Role: High-reliability transient suppressor placed upstream of PMIC and storage controller power domains. Use Value: 600nA max leakage at 22V prevents standby current accumulation - preserves battery life in portable storage devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same die, identical electrical specs and pinout - SC4624AMLTRT is Semtech's alternate orderable part number for TDS2211P per official Semtech documentation. | No functional difference; used interchangeably in BOMs and layouts. | Select SC4624AMLTRT when sourcing from distributors listing this specific tape-and-reel variant (3,000 pcs/reel, 7″ reel). |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, ±30kV ESD, but higher 35V clamping at 20A - lacks constant-clamp FET architecture. | Suitable only for CC/SBU lines or low-energy 24V rails; cannot replace SC4624AMLTRT on 20V+ VBUS with 40A surge requirement. | Use uClamp2411ZA only for auxiliary signal lines where clamping voltage margin allows >30V, not for main power rail protection. |
Compared with TDS2211P, SC4624AMLTRT is an identical-specification variant with identical DFN-6 pinout and performance - no redesign needed. Compared with uClamp2411ZA, SC4624AMLTRT offers 2× higher surge current rating and 7–8V lower clamping, making it suitable for primary VBUS protection where reliability under sustained industrial surge stress is mandatory.
Availability
SC4624AMLTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch interfaces, and notebook VBUS rail protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SC4624AMLTRT 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.
SC4624AMLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered specifically to replace conventional TVS diodes in high-reliability 12–36V power rail protection applications demanding flat clamping and temperature stability.
FAQ
What is the exact package type and dimensions of SC4624AMLTRT?
SC4624AMLTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with no thermal pad. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. All six pins must be soldered to achieve full 40A surge rating - partial connection degrades performance.
Does SC4624AMLTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC4624AMLTRT is rated for ±1kV (1.2/50μs voltage, 8/20μs current, RS = 42Ω) on unsymmetrical lines and supports 40A (8/20μs) peak pulse current - exceeding IEC 61000-4-5 Level 4 requirements for industrial environments. Its 27.5–28V clamping ensures downstream ICs remain within safe operating voltage.
How does SC4624AMLTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC4624AMLTRT uses a triggered FET to maintain near-constant clamping (~27.5–28V) from 1A to 40A. This eliminates voltage margin uncertainty at high temperatures or high-current surges - a key advantage in USB PD and industrial applications.
Can SC4624AMLTRT be used on high-speed data lines like USB SuperSpeed?
No, SC4624AMLTRT is not intended for high-speed data lines. With 175pF junction capacitance, it is optimized for power rail (VBUS) or low-frequency I/O protection. For USB SS TX/RX lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF); SC4624AMLTRT should only be applied to VBUS, CC, or SBU lines where capacitance is not critical.
Is SC4624AMLTRT RoHS and halogen-free compliant?
Yes, SC4624AMLTRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free - confirmed in Semtech's official datasheet Rev 2.5 and ordering information.
SC4624AMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 20-VFQFN 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):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ (4x4)
SC4624AMLTRT FAQ
1.How can I place an order for SC4624AMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4624AMLTRT 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 SC4624AMLTRT reliable?
The price and inventory of SC4624AMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4624AMLTRT is usually 5 days.
3.What payment methods are accepted for SC4624AMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4624AMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4624AMLTRT?
SC4624AMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4624AMLTRT 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 SC4624AMLTRT?
For technical support, including SC4624AMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4624AMLTRT requirements.
6.How does Aetrix verify that SC4624AMLTRT is sourced from the original manufacturer or authorized distributors?
All SC4624AMLTRT 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 SC4624AMLTRT meets industry standards.
7.What is the process for return or replacement of SC4624AMLTRT?
All SC4624AMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4624AMLTRT, 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 SC4624AMLTRT part is unused and in its original packaging.
Return procedure for SC4624AMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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