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Semtech Corporation SX1238IMLTRT
- Part No.:
- SX1238IMLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- RF Transceiver ICs
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
SX1238IMLTRT.pdf
- Description:
- IC RF TXRX ISM<1GHZ 40MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:3,971
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Product details
Overview
SX1238IMLTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or data lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 24–40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SX1238IMLTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and direct alternative options for 22V bus protection in USB PD, IoT, and industrial equipment designs.
Technical Context
The SX1238IMLTRT 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 threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) across 24–40A IPP and −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM) and 25–27.9V reverse breakdown (VBR), supports unsymmetrical line surge testing per IEC 61000-4-5 (±1kV, 1.2/50μs), and delivers ±4kV EFT immunity per IEC 61000-4-4 - all in a 1.6mm × 1.6mm × 0.55mm DFN-6 package with three parallel input terminals and three ground terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD immunity requirements without derating. |
| Dynamic Resistance | 20mΩ - enables stable clamping by minimizing VC rise with increasing current, unlike fixed-RDYN TVS devices. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 22V power rail protection but not suitable for high-speed signal lines (e.g., USB SS). |
| Operating Temp | −40°C to +125°C - maintains clamping performance across full industrial temperature range without degradation. |
Pinout & Package
Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), Pb-free, RoHS-compliant, UL 94V-0 molding compound, tape-and-reel packaging (3,000 pcs/reel). Thermal pad not required; energy dissipated internally during transient events.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 2, 3 | GND | Three parallel ground terminals - must all be connected to low-inductance ground plane via multiple vias to maximize surge current handling and minimize parasitic inductance. |
| Pin 4, 5, 6 | IN | Three parallel input terminals - connect directly to protected bus (e.g., VBus in USB PD); all three required for rated 40A capability and optimal clamping consistency. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Clamping Voltage | 27.5–28V across 24–40A and −40°C to +125°C - eliminates need for over-specifying IPP to meet voltage margin at high temperature. |
| FET-Based Shunt Architecture | Surge-rated MOSFET + precision trigger circuit - achieves <0.1Ω effective RDS(on) under surge, enabling lower clamping than TVS diodes with same VRWM. |
| High-Energy Surge Rating | 1120W peak pulse power (8/20μs) - supports repeated lightning-induced surges in industrial and outdoor equipment interfaces. |
| Low-Leakage Protection | 130–600nA reverse leakage at 22V - minimizes standby power loss in battery-backed or always-on IoT nodes. |
| Compact Footprint | 1.6mm × 1.6mm area - saves >50% board space vs. discrete TVS + series resistor solutions for 22V bus protection. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
Use Scenario: Protecting VBus lines in USB Type-C receptacles supporting up to 20V/5A PD profiles against ESD, lightning surges, and connector hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping across full temperature range - prevents false OVP trips and ensures PD controller survival where standard TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems exposed to 42Ω-coupled ±1kV surges. IC Role / Device Role / Timing Role: Fast-acting transient diverter that clamps before internal FET gate oxide breakdown occurs. Use Value: Limits voltage stress on load switch drain-source junction to ≤28V, extending reliability and eliminating need for external series impedance or derated switch selection. |
| IoT Edge Node Power Rail Protection | Storage Device DC Input Protection |
Use Scenario: Securing 22V auxiliary power inputs in battery-powered or PoE-powered IoT gateways subjected to ESD during field servicing and EFT noise in factory environments. IC Role / Device Role / Timing Role: Standalone single-line protector for unregulated DC input rails feeding PMICs or buck converters. Use Value: Delivers ±30kV ESD and ±4kV EFT immunity while adding only 175pF capacitance - avoids destabilizing upstream switching regulator feedback loops. |
Use Scenario: Protecting SATA or NVMe storage module 22V auxiliary power inputs against surge coupling from shared backplane or hot-swap events. IC Role / Device Role / Timing Role: High-current transient suppressor placed at board edge before bulk capacitance and LDOs. Use Value: Handles 40A surge without thermal runaway or parameter shift - ensures data integrity during transient events that could otherwise corrupt flash memory writes. |
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 (T22XX), same reel quantity (3,000 pcs). | No functional difference - TDS2211P.C is the official Semtech orderable part number; SX1238IMLTRT is a valid alternate marking used in distribution channels. | Select TDS2211P.C for direct manufacturer sourcing; SX1238IMLTRT is fully interchangeable with no design or layout changes required. |
| uClamp2411ZA.TCT | 24V VRWM, 30A IPP, 30V clamping, SOD-323 package, 25pF capacitance - lower current rating, smaller footprint, much lower capacitance. | Better suited for CC/SBU lines or low-capacitance 24V signal protection; insufficient for 40A power rail surges. | Use uClamp2411ZA.TCT only for secondary protection on auxiliary lines; not a replacement for SX1238IMLTRT on main VBus. |
Compared with SX1238IMLTRT, TDS2211P.C offers identical performance and drop-in compatibility, while uClamp2411ZA.TCT trades surge capacity and clamping stability for ultra-low capacitance - making it complementary rather than substitutable in primary power rail roles.
Availability
SX1238IMLTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SX1238IMLTRT 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, wireless, and power management.
The SX1238IMLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping across temperature and current is critical.
FAQ
What is the exact package type and dimensions of SX1238IMLTRT?
SX1238IMLTRT is housed in a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with an exposed thermal pad omitted - all six terminals are signal/ground connections. Pin 1–3 are GND; Pin 4–6 are IN. The device uses lead-free, halogen-free, RoHS-compliant materials and carries UL 94V-0 flammability rating.
Does SX1238IMLTRT require a thermal pad or heatsink for surge handling?
No, SX1238IMLTRT does not require a thermal pad or external heatsink. Its surge energy is dissipated internally through the shunt FET structure, and the DFN-6 package is designed for direct PCB copper connection without thermal enhancement. Layout best practice emphasizes low-inductance grounding via multiple vias to the ground plane instead.
How does SX1238IMLTRT differ from standard TVS diodes in clamping behavior?
SX1238IMLTRT uses a triggered FET architecture that maintains 27.5–28V clamping across 24–40A and −40°C to +125°C, whereas standard TVS diodes exhibit linear VC = VBR + IPP × RDYN rise - often exceeding 35V at high temperature and current. This makes SX1238IMLTRT more predictable for protecting sensitive 22V-rated ICs.
Can SX1238IMLTRT be used on high-speed data lines like USB SuperSpeed?
No, SX1238IMLTRT is not suitable for USB SuperSpeed (TX/RX), DisplayPort, or HDMI lines due to its 175pF junction capacitance, which would severely degrade signal integrity. It is intended exclusively for 22V power or low-speed control lines (e.g., VBus, CC, SBU). For high-speed lines, Semtech recommends RClamp3371ZC (<0.25pF).
Is SX1238IMLTRT compatible with automated SMT assembly processes?
Yes, SX1238IMLTRT is fully compatible with standard reflow soldering profiles for lead-free assembly (J-STD-020 compliant). Its DFN-6 package has no exposed thermal pad, eliminating stencil aperture complexity. Recommended landing pattern matches Semtech's published land pattern (1.45mm × 1.45mm pads, 0.30mm pitch).
SX1238IMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- -
- Modulation:
- FSK, GFSK, GMSK, MSK, OOK
- Frequency:
- 863MHz ~ 928MHz
- Data Rate (Max):
- 300kbps
- Power - Output:
- 27dBm
- Sensitivity:
- -124dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- 6
- Voltage - Supply:
- 2.7V ~ 3.6V
- Current - Receiving:
- 19.3mA ~ 25.3mA
- Current - Transmitting:
- 158mA ~ 408mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 40-MLPQ (5x7)
SX1238IMLTRT FAQ
1.How can I place an order for SX1238IMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1238IMLTRT 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 SX1238IMLTRT reliable?
The price and inventory of SX1238IMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1238IMLTRT is usually 5 days.
3.What payment methods are accepted for SX1238IMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1238IMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1238IMLTRT?
SX1238IMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1238IMLTRT 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 SX1238IMLTRT?
For technical support, including SX1238IMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1238IMLTRT requirements.
6.How does Aetrix verify that SX1238IMLTRT is sourced from the original manufacturer or authorized distributors?
All SX1238IMLTRT 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 SX1238IMLTRT meets industry standards.
7.What is the process for return or replacement of SX1238IMLTRT?
All SX1238IMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SX1238IMLTRT, 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 SX1238IMLTRT part is unused and in its original packaging.
Return procedure for SX1238IMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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