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Semtech Corporation SX1236IMLTRT
- Part No.:
- SX1236IMLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- RF Transceiver ICs
- Package:
- 28-VQFN Exposed Pad
- Datasheet:
-
SX1236IMLTRT.pdf
- Description:
- IC RF TXRX ISM<1GHZ 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:994
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Product details
Overview
SX1236IMLTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power 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 its full current and temperature range (−40°C to +125°C). It is used in USB Type-C PD input protection where low, temperature-invariant clamping prevents damage to downstream controllers.
For engineers reviewing the SX1236IMLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over temperature, dynamic resistance (<20 mΩ), junction capacitance (175 pF), and DFN 1.6×1.6 mm 6-lead package compatibility with high-density USB and industrial PCB layouts.
Technical Context
The SX1236IMLTRT 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 ~27.9V breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge, not fixed RDYN.
It operates as a single-line protector with three parallel input terminals (Pins 4–6) and three ground terminals (Pins 1–3), enabling low-inductance layout and 40A surge handling. Its solid-state architecture avoids junction heating limitations, sustaining performance up to +125°C without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - Maximum continuous DC bus voltage it safely withstands without leakage or conduction. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - Limits transient overvoltage to safe levels for 22V-rated ICs like USB PD controllers. |
| Peak Pulse Current | 40 A (8/20μs) - Withstands high-energy surges per IEC 61000-4-5, including ±1 kV (1.2/50μs) on unsymmetrical lines. |
| Dynamic Resistance | 20 mΩ - Enables flat clamping response; voltage rise per amp is negligible (<0.02 V/A) across full surge range. |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - Low enough for 22V power rail protection without signal integrity impact on DC/low-frequency lines. |
| ESD Rating | ±30 kV contact & air (IEC 61000-4-2) - Meets highest system-level ESD immunity requirements for exposed connectors. |
| Operating Temperature | −40°C to +125°C - Fully specified performance across automotive and industrial ambient ranges without derating. |
Pinout & Package
Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, Pb-free, RoHS-compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to maximize surge current capability and minimize parasitic impedance. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBUS); shared connection ensures uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28 V across 24–40 A and −40°C to +125°C - Eliminates need for thermal derating and simplifies worst-case margin analysis. |
| Ultra-low dynamic resistance | 20 mΩ - Reduces voltage overshoot during fast-rising transients and enables higher surge current handling in compact layout. |
| High EFT immunity | ±4 kV per IEC 61000-4-4 (5/50 ns, 100 kHz/5 kHz) - Protects against repetitive burst noise common in industrial motor drives and switching power supplies. |
| Small-footprint DFN package | 1.6 mm × 1.6 mm - Saves >50% board area vs. traditional SOT-23 or SOIC TVS solutions while maintaining 40A rating. |
| Lead-free & halogen-free | RoHS/WEEE compliant with UL 94V-0 flammability - Meets global environmental compliance and safety standards for consumer and industrial end equipment. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBUS line of a USB Type-C port supporting up to 20V PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at the connector, clamping transients before they reach the PD controller or load switch. Use Value: Maintains 27.5–28 V clamping across temperature-prevents overvoltage damage to 22V-tolerant PD controllers where conventional TVS would exceed 35 V at 125°C. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways subjected to field-installed wiring surges. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage stress on the load switch's internal MOSFET drain-source junction during 40A surges. Use Value: Prevents latch-up or permanent failure of the load switch by holding clamping voltage below its absolute maximum VDS rating, even at full temperature range. |
| Notebook/Tablet VBUS Rail Protection | Industrial Equipment DC Power Input Protection |
Use Scenario: Securing the main 20V DC input rail of thin-client notebooks and tablets against accidental hot-plug transients and connector ESD. IC Role / Device Role / Timing Role: Standalone rail protector between the USB-C receptacle and system PMIC, operating continuously at 22V working voltage. Use Value: Delivers 175 pF capacitance-low enough to avoid affecting power rail stability or inrush behavior, unlike higher-capacitance polymer TVS alternatives. |
Use Scenario: Hardening 24V DC input ports on programmable logic controllers (PLCs), HMI panels, and factory automation modules against induced surges from relay switching or nearby motor operation. IC Role / Device Role / Timing Role: First-stage surge diverter on the primary DC input, coordinated with downstream ceramic fuses and filtering. Use Value: Withstands repeated ±1 kV (1.2/50 μs) surges per IEC 61000-4-5 without degradation-enabling long-term reliability in harsh electromagnetic 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 | Identical electrical specs and package; same Semtech die, differentiated only by tape-and-reel packaging (3,000 pcs/reel vs. SX1236IMLTRT's standard reel quantity). | No functional difference; both rated for USB PD, industrial 22V rails, and load switch protection. | Select TDS2211P.C if volume procurement requires exact Semtech ordering code alignment and traceability. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A (8/20μs), 3.5Ω RDYN - clamping rises significantly with current and temperature. | Higher clamping voltage limits use in 22V systems near controller breakdown margins; unsuitable for high-temp industrial operation without derating. | Choose SMAJ22A only for cost-sensitive, non-temperature-critical 22V applications where 35.5V clamping is acceptable. |
Compared with SX1236IMLTRT, TDS2211P.C offers identical protection performance and drop-in compatibility, while SMAJ22A provides lower cost but sacrifices clamping stability, temperature resilience, and surge robustness-making SX1236IMLTRT the preferred choice for USB PD and industrial 22V systems demanding consistent protection margins.
Availability
SX1236IMLTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and notebook/tablet VBUS rail protection requiring stable component supply, long lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SX1236IMLTRT 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.
SX1236IMLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power and interface protection applications where clamping stability and temperature insensitivity are critical.
FAQ
What is the maximum continuous operating voltage for SX1236IMLTRT?
The SX1236IMLTRT has a reverse stand-off voltage (VRWM) of 22 V, meaning it can reliably block up to 22 V DC or RMS AC continuously without significant leakage or conduction. This makes it suitable for nominal 20V USB PD and 24V industrial power rails where transient headroom is required.
How does SX1236IMLTRT achieve stable clamping voltage across temperature?
SX1236IMLTRT uses a surge-rated FET triggered by a precision circuit instead of a PN-junction diode. As surge current increases, the FET's RDS(on) decreases, counteracting voltage rise. This architecture maintains clamping at 27.5–28 V from −40°C to +125°C-unlike TVS diodes whose clamping rises linearly with temperature and current.
Can SX1236IMLTRT be used for protecting USB SuperSpeed differential pairs?
No-SX1236IMLTRT is designed for single-line, high-current power or control rail protection (e.g., VBUS, CC, or load switch inputs), not high-speed data lines. Its 175 pF capacitance would severely degrade signal integrity on USB 3.x or DisplayPort lanes. For those, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25 pF).
What is the recommended PCB layout for optimal surge performance of SX1236IMLTRT?
Place SX1236IMLTRT as close as possible to the protected connector. Connect all three IN pins (4–6) via a single short, wide trace to the protected line, and tie all three GND pins (1–3) directly to a solid ground plane using multiple vias. Avoid stubs or splits-this minimizes inductance and ensures full 40A surge current sharing across parallel terminals.
Is SX1236IMLTRT compatible with lead-free reflow soldering processes?
Yes-SX1236IMLTRT is qualified for standard lead-free reflow profiles (JEDEC J-STD-020), with a moisture sensitivity level (MSL) of 1 and maximum peak temperature tolerance of 260°C. Its DFN package and Pb-free terminations comply with IPC-A-610 Class 2/3 assembly requirements.
SX1236IMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 28-VQFN 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:
- 137MHz ~ 1.02GHz
- Data Rate (Max):
- 300kbps
- Power - Output:
- 20dBm
- Sensitivity:
- -123dBm
- 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)
SX1236IMLTRT FAQ
1.How can I place an order for SX1236IMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1236IMLTRT 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 SX1236IMLTRT reliable?
The price and inventory of SX1236IMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1236IMLTRT is usually 5 days.
3.What payment methods are accepted for SX1236IMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1236IMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1236IMLTRT?
SX1236IMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1236IMLTRT 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 SX1236IMLTRT?
For technical support, including SX1236IMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1236IMLTRT requirements.
6.How does Aetrix verify that SX1236IMLTRT is sourced from the original manufacturer or authorized distributors?
All SX1236IMLTRT 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 SX1236IMLTRT meets industry standards.
7.What is the process for return or replacement of SX1236IMLTRT?
All SX1236IMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SX1236IMLTRT, 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 SX1236IMLTRT part is unused and in its original packaging.
Return procedure for SX1236IMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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