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Semtech Corporation SX1277IMLTRT
- Part No.:
- SX1277IMLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- RF Transceiver ICs
- Package:
- 28-VQFN Exposed Pad
- Datasheet:
-
SX1277IMLTRT.pdf
- Description:
- IC RF TXRX 802.15.4 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,982
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Product details
Overview
TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping across full current and temperature range (−40°C to +125°C); it is deployed in USB Type-C PD bus protection and load switch input hardening.
For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection considerations include its constant-clamp FET-based architecture, DFN 1.6×1.6mm 6-lead package with triple parallel input/ground terminals, low 20mΩ dynamic resistance, and 175pF junction capacitance at 22V - all critical for robust industrial and high-speed interface surge resilience.
Technical Context
The TDS2211P uses a surge-rated FET as the primary shunt element, activated by a precision trigger circuit that turns on the FET when transient voltage exceeds the breakdown threshold (~27V), enabling near-constant clamping independent of peak current magnitude. Its operation avoids the linear VC = VBR + IPP × RDYN behavior typical of conventional TVS diodes.
Clamping voltage remains stable from −40°C to +125°C due to the FET's decreasing RDS(on) under surge, delivering 27.5–28V at both 24A and 40A (1.2/50μs–8/20μs combo wave, RS = 2Ω), while maintaining <600nA reverse leakage at 22V and 25°C. The device protects one unidirectional line with 22V working voltage and 1120W peak pulse power capability.
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 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage thresholds during worst-case surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - provides system-level ESD robustness without external shielding or layout mitigation. |
| Dynamic Resistance | 20mΩ - enables low-voltage drop during high-current transients, minimizing energy dissipation in the device itself. |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with USB Type-C VBUS protection where signal integrity on adjacent high-speed lanes is preserved. |
| Operating Temp | −40°C to +125°C - supports deployment in industrial equipment, robotics, and automotive-adjacent IoT edge nodes. |
Pinout & Package
Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, marked "T22" + date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Parallel ground terminals - must all be connected to minimize inductance and maximize surge current path efficiency. |
| 4, 5, 6 | IN | Parallel input terminals - connect directly to protected bus (e.g., USB PD VBUS); all three required for rated 40A performance. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping architecture | Delivers flat clamping voltage across 1–40A surge range, eliminating voltage rise with increasing current unlike TVS diodes. |
| Triple-terminal parallel I/O | Reduces effective trace inductance and thermal resistance, enabling full 40A rating without derating or thermal pads. |
| Low dynamic resistance (20mΩ) | Minimizes IR drop during surge, lowering junction temperature rise and extending device lifetime under repeated transients. |
| Stable clamping over temperature | Maintains ≤28V clamping from −40°C to +125°C - critical for industrial environments where ambient drift affects protection margin. |
| 175pF capacitance at 22V | Enables integration on high-voltage power rails without degrading adjacent high-speed data lane integrity (e.g., USB SS, DP). |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the 20–22V VBUS line in USB Type-C ports supporting up to 100W PD, exposed to ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller/load switch, clamping transients before they reach sensitive silicon. Use Value: Maintains 27.5–28V clamping at 40A and across temperature - prevents overvoltage damage to USB PD controllers rated for ≤30V absolute max. |
Use Scenario: Hardening the input of industrial-grade load switches (e.g., HS2950P) used in remote meters, PLC I/O modules, and robotic power distribution. IC Role / Device Role / Timing Role: Front-end transient suppressor on VIN rail, absorbing surge energy before it stresses the internal FET or OVP circuitry of the load switch. Use Value: Keeps clamping voltage below the 30–35V drain-source breakdown of common load switch FETs, avoiding catastrophic failure during 1kV/42Ω surges. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary power inputs in battery-backed IoT gateways, cellular routers, and smart sensors deployed in electrically noisy field environments. IC Role / Device Role / Timing Role: Standalone EOS guard on primary DC input, coordinated with upstream fusing and downstream LDOs/PMICs. Use Value: Delivers ±30kV ESD immunity and 40A surge capacity in 1.6×1.6mm footprint - enabling compact, ruggedized designs without sacrificing protection level. |
Use Scenario: Protecting 22V supercapacitor or LiFePO₄ backup supplies in enterprise SSDs, NAS enclosures, and RAID controllers against power-rail transients during hot-swap or grid instability. IC Role / Device Role / Timing Role: Bidirectional surge clamp on backup supply rail, preventing overvoltage from damaging charge management ICs or NAND flash power domains. Use Value: Stable 28V clamping ensures backup supply stays within safe operating area of storage controller power inputs, even at 125°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Standard unidirectional TVS diode; clamping rises to ~42V at 40A (8/20μs), higher dynamic resistance (~0.5Ω), no temperature stability. | Limited to lower-temp, lower-energy applications; unsuitable for USB PD or industrial 125°C environments requiring flat clamping. | Select only if cost sensitivity outweighs clamping stability and temperature performance. |
| TPD2E001DRYR | Low-capacitance (1.5pF) dual-channel ESD protector; rated only for 3A (8/20μs), 12V working voltage, no surge capability. | Designed for high-speed data lines (USB 2.0, HDMI), not power rail protection; cannot handle 22V or 40A surges. | Use only for signal-line ESD; never substitute for TDS2211P on VBUS or load switch inputs. |
Compared with SMAJ22A and TPD2E001DRYR, the TDS2211P uniquely delivers constant 28V clamping at 40A across −40°C to +125°C in a 1.6×1.6mm DFN - making it the only viable option for space-constrained, thermally demanding 22V power rail protection where traditional TVS diodes fail to meet safety margins.
Availability
TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch hardening, and IoT edge node power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for TDS2211P 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, power management, and transient protection.
The TDS family was engineered to replace conventional TVS diodes in high-reliability 20–30V power rail applications, delivering flat clamping via FET-shunt architecture for industrial, computing, and USB infrastructure markets.
FAQ
What is the maximum continuous operating voltage for TDS2211P?
The TDS2211P has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC without significant leakage or conduction. This makes TDS2211P suitable for protecting 20V USB PD VBUS lines and other 22V-rated power rails where sustained voltage exposure occurs without triggering clamping action.
How does TDS2211P achieve constant clamping voltage across varying surge currents?
TDS2211P achieves constant clamping by using a surge-rated FET as the shunt element, activated by a precision trigger circuit. As surge current increases, the FET's RDS(on) decreases, counteracting voltage rise - resulting in stable 27.5–28V clamping from 1A to 40A (8/20μs). This differs fundamentally from TVS diodes whose clamping rises linearly with current.
Can TDS2211P be used on bidirectional signal lines like USB DP/DM?
No - TDS2211P is a unidirectional suppressor intended only for power or single-ended I/O lines. Its pinout (IN/GND) and electrical characteristics (22V VRWM, 27V VBR) are optimized for VBUS or load switch input protection. For bidirectional high-speed lines such as USB DP/DM, low-capacitance ESD arrays like RClamp3371ZC are required instead of TDS2211P.
What is the recommended PCB layout for optimal surge performance of TDS2211P?
For optimal performance, place TDS2211P as close as possible to the connector, connect all three IN pins (4,5,6) via a single short, wide trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using multiple vias. Avoid thermal pads - energy is dissipated in the FET channel, not the die attach.
Is TDS2211P compliant with industry environmental standards?
Yes - TDS2211P is Pb-free, halogen-free, and RoHS/WEEE compliant. Its molding compound meets UL 94V-0 flammability rating, and it ships in tape-and-reel packaging (3,000 units per 7-inch reel) with marking code "T22" plus date code, ensuring full traceability and regulatory alignment for global industrial and consumer deployments.
SX1277IMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- LoRa™
- Package/Case:
- 28-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- 802.15.4
- Protocol:
- LoRa™
- Modulation:
- FSK, GFSK, GMSK, MSK, OOK
- Frequency:
- 137MHz ~ 1.02GHz
- Data Rate (Max):
- 300kbps
- Power - Output:
- 20dBm
- Sensitivity:
- -148dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- 6
- Voltage - Supply:
- 1.8V ~ 3.7V
- Current - Receiving:
- 10.8mA ~ 12mA
- Current - Transmitting:
- 20mA ~ 120mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 28-QFN (6x6)
SX1277IMLTRT FAQ
1.How can I place an order for SX1277IMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1277IMLTRT 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 SX1277IMLTRT reliable?
The price and inventory of SX1277IMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1277IMLTRT is usually 5 days.
3.What payment methods are accepted for SX1277IMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1277IMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1277IMLTRT?
SX1277IMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1277IMLTRT 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 SX1277IMLTRT?
For technical support, including SX1277IMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1277IMLTRT requirements.
6.How does Aetrix verify that SX1277IMLTRT is sourced from the original manufacturer or authorized distributors?
All SX1277IMLTRT 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 SX1277IMLTRT meets industry standards.
7.What is the process for return or replacement of SX1277IMLTRT?
All SX1277IMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SX1277IMLTRT, 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 SX1277IMLTRT part is unused and in its original packaging.
Return procedure for SX1277IMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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