SX1281IMLTRT SEMTECH Integrated Circuit (Quad Flat No-Lead) In Stock
SEMTECH SX1281IMLTRT is a 2.4 GHz LoRa and FLRC wireless transceiver IC in a compact QFN package, offering up to 1 Mbps data rate with long-range sub-GHz-class link budget for IoT and smart home applications. Features integrated PA and low-power modes. Available from stock with worldwide shipping.
- Manufacturer
- SEMTECH
- Package
- Quad Flat No-Lead
- Pin Count
- 25
- Lifecycle
- ACTIVE
- Datasheet
- SX1281IMLTRT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $3.0250(MOQ 19)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 2.4 GHz LoRa transceiver supporting data rates from 203 kbps up to 1625 kbps, enabling flexible range-versus-throughput trade-offs in IoT networks
- FLRC (Fast Long Range Communication) mode achieves up to 1 Mbps at sensitivity near -96 dBm for high-throughput short-range wireless links
- Integrated power amplifier and LNA in a compact QFN package minimize external RF component count and PCB area for space-constrained IoT designs
Applications
The SX1281IMLTRT is designed for short-range to mid-range IoT applications including smart home sensors, building automation gateways, wireless game controllers, and industrial monitoring nodes that require reliable 2.4 GHz connectivity at data rates up to 1 Mbps. Its LoRa modulation at 2.4 GHz provides robust link performance in environments with multipath interference, while FLRC mode serves applications that demand higher throughput than sub-1 GHz LoRa can deliver. The integrated PA and low-power sleep modes make it suitable for battery-powered devices with duty-cycled transmission.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What modulation schemes does SX1281IMLTRT support and what data rates do they achieve?
The SX1281IMLTRT supports LoRa modulation at 2.4 GHz with data rates ranging from approximately 203 kbps to 1625 kbps depending on spreading factor and bandwidth, and FLRC mode reaching up to 1 Mbps. This flexibility lets designers trade off range against throughput: LoRa at lower data rates extends link range, while FLRC maximizes throughput for latency-sensitive applications.
How does the 2.4 GHz SX1281 compare to a sub-1 GHz SX1276 LoRa transceiver for a building sensor network?
The SX1281IMLTRT operates at 2.4 GHz with a typical receiver sensitivity around -93 dBm in LoRa mode, while the SX1276 at 868 MHz achieves sensitivity near -137 dBm. The sub-1 GHz SX1276 offers better wall penetration and longer outdoor range, whereas the SX1281 benefits from higher data rates (up to 1 Mbps in FLRC mode) and avoids crowded 868/915 MHz ISM bands in environments with many LoRa gateways.
What is the package type and approximate size of SX1281IMLTRT, and how does that affect PCB layout?
The SX1281IMLTRT comes in a QFN (Quad Flat No-Lead) package, which is a compact surface mount form with an exposed thermal pad on the bottom. QFN packages typically measure 4 mm x 4 mm or 5 mm x 5 mm; designers should verify the exact footprint in SEMTECH's datasheet and include a ground via array under the thermal pad to achieve the specified RF and thermal performance in a 2-layer or 4-layer PCB layout.
Which IoT protocol stacks are compatible with SX1281IMLTRT for multi-node mesh networking?
The SX1281IMLTRT can run SEMTECH's LoRa 2.4 GHz protocol stack, which is compatible with LoRaWAN Class A, B, and C node designs at 2.4 GHz frequencies. For mesh topologies, it supports point-to-multipoint configurations with up to 255 addressable nodes in a star or multi-hop arrangement, operating across 80 MHz of available bandwidth in the 2.4 GHz ISM band with channel plans selectable at 800 kHz spacing.
Related Guides
CL31A107MQHNNNE 1206 100 uF MLCC Selection Guide
How to choose CL31A107MQHNNNE and related 1206 MLCCs for low-voltage bulk capacitance and regulator stability.
Jul 2, 2026
CL05B103KB5NNNC 0402 10 nF X7R MLCC Selection Guide
How to choose CL05B103KB5NNNC and related 0402 MLCCs for bypassing, filtering, voltage derating, and sourcing.
Jul 2, 2026
ADAQ7768-1 Design Guide for Precision Vibration and Dynamic Signal Measurement
Design ADAQ7768-1 precision data acquisition channels for vibration and dynamic sensing with the right bandwidth, reference, clock, and layout choices.
Jun 30, 2026
AD5204BRZ10 Design Guide for SPI-Controlled Gain and Offset Calibration
Design AD5204BRZ10 digital potentiometer calibration loops with bounded trim span, safe wiper current, clean SPI routing, and reliable startup codes.
Jun 30, 2026
Why Buy from FindMyChip
About SEMTECH
SEMTECH is a leading electronic component manufacturer. FindMyChip sources SEMTECH ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 19+ | $3.2500 | $61.75 |
| 500+ | $3.2367 | $1618.35 |
| 1000+ | $3.1575 | $3157.50 |
| 2500+ | $3.0879 | $7719.75 |
| 48000+ | $3.0250 | $145200.00 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”