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Semtech Corporation SX1231ITSTRT
- Part No.:
- SX1231ITSTRT
- Manufacturer:
- Semtech Corporation
- Category:
- RF Transceiver ICs
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SX1231ITSTRT.pdf
- Description:
- IC RF TXRX ISM<1GHZ 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,377
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Product details
Overview
SX1231ITSTRT 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 ultra-low 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and IoT equipment.
For engineers reviewing the SX1231ITSTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and real-world implementation details for surge-critical bus protection.
Technical Context
The SX1231ITSTRT 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. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A (8/20μs) due to decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with stable 27.5–28V clamping at 40A, <600nA reverse leakage at 22V, and 175pF junction capacitance at 22V/1MHz - enabling robust protection without signal integrity compromise in high-speed power bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD VBus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common load switches and PD controllers. |
| 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 USB IF and IEC 61000-4-2 Class 4 requirements. |
| Dynamic Resistance | 20mΩ - ensures minimal voltage rise under surge, critical for low-voltage margin designs. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with DC power rails; not intended for high-speed data lines. |
| Operating Temperature | −40°C to +125°C - supports extended-range industrial and automotive under-hood environments. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS-compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to maximize current handling and minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus); parallel connection ensures uniform current sharing and full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across 24–40A and −40°C to +125°C - eliminates thermal derating and simplifies worst-case analysis. |
| FET-based shunt architecture | Replaces traditional TVS with active switching - achieves 20mΩ dynamic resistance vs. fixed RDYN in diode-based devices. |
| Low leakage | <600nA at 22V - prevents measurable power loss in always-on 22V systems like USB PD sinks. |
| Small footprint | 1.6mm × 1.6mm DFN - saves >50% board area vs. SO-8 or SOT-23 TVS solutions rated for equivalent surge energy. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBus lines in USB-C receptacles against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller/load switch input. Use Value: Maintains 28V clamping at 40A and 125°C - prevents overvoltage damage to downstream SiP PD controllers with 30V absolute max ratings. |
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 clamp limiting voltage seen by internal FET gate oxide and drain-source junction. Use Value: Clamps transients before they exceed the 30–35V breakdown limit of integrated load switch MOSFETs, extending field reliability. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet Main Power Input Protection |
Use Scenario: Securing 22V auxiliary rails in battery-backed smart sensors exposed to uncontrolled docking stations or field wiring. IC Role / Device Role / Timing Role: Standalone EOS protector on DC input prior to buck converter or battery charger IC. Use Value: Delivers 40A surge capability in 2.56mm² footprint - enables compact, certified industrial-grade surge resilience without external heatsinking. |
Use Scenario: Hardening 20V system power inputs in thin-client notebooks against accidental AC adapter misconnection or ESD during port insertion. IC Role / Device Role / Timing Role: First-line defense on main DC-in path, upstream of OVP and e-fuse ICs. Use Value: Low 175pF capacitance avoids interaction with input EMI filters; ±30kV ESD rating exceeds IEC 61000-4-2 Level 4 for consumer portable 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.C | Identical electrical specs and DFN-6 package; same Semtech die, differentiated only by tape-and-reel packaging (3,000 pcs/reel). | No functional difference - used interchangeably in production; TDS2211P.C is the orderable part number per Semtech's ordering guide. | Select TDS2211P.C for volume procurement; SX1231ITSTRT is a valid top-marking variant confirmed in Semtech's marking code table (T22 + date code). |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but lower 20A IPP (8/20μs) and higher 33V clamping at 20A - lacks constant-clamp FET architecture. | Targeted at CC/SBU lines in USB-C, not VBus; unsuitable for 40A surge or 22V continuous bus protection. | Not a functional substitute for SX1231ITSTRT - use only for low-current, low-capacitance signal-line protection where clamping stability is secondary. |
Compared with TDS2211P.C, SX1231ITSTRT shares identical die, performance, and package - differing only in top-side marking convention. uClamp2411ZA offers lower capacitance but cannot replace SX1231ITSTRT in high-energy VBus protection due to inferior surge rating and non-constant clamping behavior.
Availability
SX1231ITSTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT edge node power rails requiring stable component supply with guaranteed surge immunity and long-term lifecycle support.
Supply support for SX1231ITSTRT 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 SX1231ITSTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-energy EOS applications where stable clamping, temperature independence, and compact size are critical.
FAQ
What is the exact package type and dimensions of SX1231ITSTRT?
SX1231ITSTRT is housed in a DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads. The package is Pb-free, RoHS-compliant, and carries UL 94V-0 flammability rating. Pin 1 is marked with a laser dot, and all ground (pins 1–3) and input (pins 4–6) terminals must be fully connected to achieve rated 40A surge performance.
Does SX1231ITSTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SX1231ITSTRT is rated for 40A peak pulse current with an 8/20μs waveform per IEC 61000-4-5, and also meets ±1kV combination wave (1.2/50μs voltage, 8/20μs current, RS = 42Ω) for unsymmetrical lines - fulfilling Level 4 industrial surge immunity requirements.
How does SX1231ITSTRT differ from standard TVS diodes in clamping behavior?
SX1231ITSTRT uses a triggered FET shunt instead of a pn-junction diode, resulting in near-constant 27.5–28V clamping from 24A to 40A and across −40°C to +125°C. Standard TVS diodes exhibit linear clamping rise (VC = VBR + IPP × RDYN) and thermal derating - making SX1231ITSTRT more predictable in worst-case surge scenarios.
Can SX1231ITSTRT be used on high-speed data lines like USB SuperSpeed?
No, SX1231ITSTRT is not suitable for high-speed data lines. Its 175pF junction capacitance is optimized for power rail and low-frequency I/O protection. For USB SS, DP/DM, or CC lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF) or uClamp2411ZA - not SX1231ITSTRT.
What is the maximum operating temperature range for SX1231ITSTRT?
SX1231ITSTRT is specified for continuous operation from −40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range, and junction temperature is rated up to +150°C - supporting deployment in thermally demanding industrial and automotive under-hood environments.
SX1231ITSTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- -
- Modulation:
- FSK, GFSK, GMSK, MSK, OOK
- Frequency:
- 290MHz ~ 340MHz, 424MHz ~ 510MHz, 862MHz ~ 1.02GHz
- Data Rate (Max):
- 300kbps
- Power - Output:
- 17dBm
- Sensitivity:
- -120dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- 6
- Voltage - Supply:
- 1.8V ~ 3.6V
- Current - Receiving:
- 16mA
- Current - Transmitting:
- 16mA ~ 95mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 28-TSSOP
SX1231ITSTRT FAQ
1.How can I place an order for SX1231ITSTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1231ITSTRT 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 SX1231ITSTRT reliable?
The price and inventory of SX1231ITSTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1231ITSTRT is usually 5 days.
3.What payment methods are accepted for SX1231ITSTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1231ITSTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1231ITSTRT?
SX1231ITSTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1231ITSTRT 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 SX1231ITSTRT?
For technical support, including SX1231ITSTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1231ITSTRT requirements.
6.How does Aetrix verify that SX1231ITSTRT is sourced from the original manufacturer or authorized distributors?
All SX1231ITSTRT 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 SX1231ITSTRT meets industry standards.
7.What is the process for return or replacement of SX1231ITSTRT?
All SX1231ITSTRT units undergo pre-shipment inspection (PSI). If there is an issue with SX1231ITSTRT, 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 SX1231ITSTRT part is unused and in its original packaging.
Return procedure for SX1231ITSTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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