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Semtech Corporation SX1268IMLTRT
- Part No.:
- SX1268IMLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- RF Transceiver ICs
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
SX1268IMLTRT.pdf
- Description:
- IC RF TXRX+MCU ISM<1GHZ 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
SX1268IMLTRT from Semtech is a sub-GHz RF transceiver IC supporting LoRa®, (G)FSK, and OOK modulation, operating in 169–960 MHz bands with 15 dBm output power, 148 dB maximum link budget, and integrated DC-DC converter. It serves as the radio front-end in LPWAN sensor nodes for smart metering and industrial telemetry.
For engineers reviewing the SX1268IMLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include its ultra-low RX current (4.2 mA), programmable packet engine, built-in AES-128 encryption, and support for dynamic RF parameter reconfiguration over SPI without full reset.
Technical Context
The SX1268IMLTRT integrates a fully autonomous packet handler, configurable LoRa modem with SF5–SF12, and adaptive RF front-end with automatic antenna switch control. Its digital baseband includes CRC, whitening, and header compression to reduce over-the-air payload size.
It implements a dual-mode receiver architecture supporting both LoRa and legacy (G)FSK/OOK demodulation within a single chip, enabling interoperability with existing narrowband systems while maintaining LoRa's long-range advantage. The internal DC-DC converter reduces external component count and improves efficiency across supply voltages from 1.8 V to 3.7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency Range | 169–960 MHz - supports global ISM bands including EU 863–870 MHz, US 902–928 MHz, and CN 470–510 MHz |
| Max Output Power | +15 dBm - sufficient for Class A end-node transmission up to 10 km in rural LoRaWAN deployments |
| Receiver Sensitivity | −148 dBm @ 125 kHz, SF12 - enables reliable reception at extreme range with minimal infrastructure |
| RX Current Consumption | 4.2 mA @ 125 kHz LoRa - extends battery life in coin-cell-powered sensors beyond 10 years |
| Integrated DC-DC Converter | Yes - eliminates need for external buck regulator, reducing BOM cost and PCB area by ~30% |
| Modulation Schemes | LoRa®, (G)FSK, OOK - allows fallback to legacy protocols during network migration or interference events |
| AES-128 Encryption Engine | Built-in hardware accelerator - offloads secure payload encryption from host MCU, reducing firmware complexity |
Pinout & Package
Package: QFN-24, 4.0 mm × 4.0 mm × 0.85 mm, exposed thermal pad, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply Input | Primary 1.8–3.7 V rail powering RF and digital blocks; decoupling required per layout guidelines |
| GND | Ground Reference | All 6 GND pins must be connected to low-inductance ground plane for stable RF performance and EMI suppression |
| ANT | RF Output | Differential RF output port requiring matching network to 50 Ω antenna; supports internal antenna switch control |
| XTAL_IN / XTAL_OUT | Crystal Oscillator Interface | Drives 32 MHz TCXO or crystal; frequency accuracy critical for LoRa timing and channel plan compliance |
| SPI_MOSI / SPI_MISO / SPI_SCK / NSS | Digital Interface | 4-wire SPI interface with dedicated NSS; supports up to 10 MHz clock for fast register access and firmware updates |
| DIO1–DIO3 | Interrupt Outputs | Configurable GPIOs signaling TX done, RX timeout, CRC OK, or preamble detection - enables low-power polling-free operation |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous Packet Engine | Handles TX/RX sequence, CRC, whitening, and header management without MCU intervention - reduces host processing load by >70% |
| Dynamic RF Parameter Reconfiguration | Change spreading factor, bandwidth, coding rate, or output power mid-operation via SPI - enables adaptive link margin optimization |
| Ultra-Low Standby Current | 1.2 μA in Sleep mode with RTC wake-up - ideal for energy-harvesting and battery-backed applications |
| Integrated Antenna Switch Control | Direct GPIO-driven control of external SPDT switch - eliminates need for separate antenna driver IC |
| Temperature-Compensated RSSI | ±1 dB accuracy over −40°C to +85°C - enables reliable signal quality assessment in outdoor deployments |
Applications
| Smart Utility Metering | Industrial Sensor Networks |
|---|---|
Use Scenario: Gas/water/electricity meters transmitting consumption data hourly via public or private LoRaWAN networks. IC Role / Device Role / Timing Role: Primary RF transceiver handling LoRa modulation, packet framing, and secure payload encryption before uplink. Use Value: −148 dBm sensitivity ensures reliable reception in underground or shielded meter pits; 15 dBm output penetrates concrete enclosures. |
Use Scenario: Wireless vibration, temperature, and pressure sensors deployed on rotating machinery in factories or oil fields. IC Role / Device Role / Timing Role: Low-power, long-range node transceiver supporting scheduled wake-up and adaptive data rate based on event severity. Use Value: 4.2 mA RX current enables multi-year battery life; autonomous packet engine minimizes MCU active time and firmware overhead. |
| Asset Tracking | Environmental Monitoring |
Use Scenario: GPS-denied indoor/outdoor cargo containers reporting location and door-open events using geofenced LoRa alerts. IC Role / Device Role / Timing Role: Dual-role transceiver supporting both periodic status reporting and immediate event-triggered uplinks. Use Value: Dynamic RF reconfiguration allows switching to higher SF during weak-signal conditions; DIO interrupts enable zero-polling event response. |
Use Scenario: Solar-powered air quality stations measuring PM2.5, NO₂, and humidity in remote urban or agricultural zones. IC Role / Device Role / Timing Role: Energy-aware RF interface coordinating with solar harvester and ultra-low-power MCU to maximize duty cycle efficiency. Use Value: 1.2 μA Sleep current preserves charge during extended dark periods; integrated DC-DC maintains regulation across wide input voltage swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sub-GHz transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SX1276IMLTRT | Legacy LoRa transceiver; no integrated DC-DC, higher RX current (9.9 mA), larger 32-pin QFN package | Limited to fixed-frequency designs; requires external regulator and more PCB area | Choose when migrating legacy designs or needing pin compatibility with older Semtech reference boards |
| CC1312R1F3RGZR | Texas Instruments SimpleLink device; ARM Cortex-M4F MCU + sub-GHz RF; supports multiple protocols (Proprietary, IEEE 802.15.4g) | Higher BOM cost and code complexity; better suited for protocol-flexible or compute-intensive edge nodes | Choose when requiring embedded processing, multi-protocol support, or TI ecosystem integration |
Compared with SX1276IMLTRT, the SX1268IMLTRT delivers 57% lower RX current and 30% smaller footprint; compared with CC1312R1F3RGZR, it offers simpler integration, lower system-level power, and optimized LoRa-specific feature set without MCU overhead.
Availability
SX1268IMLTRT is available at Aetrix Electronics and suitable for smart utility metering, industrial sensor networks, and asset tracking applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SX1268IMLTRT 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 high-performance analog and mixed-signal semiconductors for enterprise computing, IoT, and communications infrastructure.
The SX1268IMLTRT belongs to Semtech's LoRa Core™ transceiver family, designed specifically for ultra-long-range, low-power LPWAN endpoints in utility, industrial, and environmental monitoring applications.
FAQ
What modulation schemes does the SX1268IMLTRT support?
The SX1268IMLTRT supports LoRa® (spreading factors 5–12, bandwidths 7.8–500 kHz), (G)FSK, and OOK modulation. This multi-modulation capability allows the SX1268IMLTRT to interoperate with legacy narrowband systems while leveraging LoRa's link budget advantages. Each scheme is configured independently via SPI registers, and modulation can be changed dynamically during operation without resetting the SX1268IMLTRT.
Does the SX1268IMLTRT include an integrated DC-DC converter?
Yes, the SX1268IMLTRT includes a fully integrated DC-DC converter supporting input voltages from 1.8 V to 3.7 V. This eliminates the need for an external buck regulator, reduces external component count by up to 5 parts, and improves overall system efficiency-especially critical in battery-powered applications where the SX1268IMLTRT achieves 4.2 mA RX current and 1.2 μA Sleep current.
What is the maximum link budget achievable with the SX1268IMLTRT?
The SX1268IMLTRT achieves a maximum link budget of 148 dB, calculated from its −148 dBm sensitivity at 125 kHz LoRa SF12 and +15 dBm output power. This value is confirmed in Semtech's official datasheet and validated across production units under standard test conditions. The SX1268IMLTRT maintains this link budget across its full operating temperature range (−40°C to +85°C) due to temperature-compensated RSSI and stable oscillator performance.
How many interrupt pins does the SX1268IMLTRT provide, and what are their functions?
The SX1268IMLTRT provides three dedicated DIO pins (DIO1–DIO3), each configurable via register settings to signal events such as TX done, RX timeout, CRC pass/fail, preamble detection, or sync word detection. These pins eliminate polling overhead and allow the host MCU to remain in low-power sleep until an RF event occurs-enabling deterministic, low-latency response in time-critical SX1268IMLTRT deployments.
Is the SX1268IMLTRT suitable for use in LoRaWAN-certified end-devices?
Yes, the SX1268IMLTRT is widely used in LoRaWAN Class A end-devices and is supported by Semtech's certified LoRa Basics MAC library. Its precise timing control, adaptive data rate (ADR) responsiveness, and regulatory-compliant RF performance-including spectral mask adherence and spurious emission limits-make the SX1268IMLTRT compliant with LoRaWAN 1.0.4 and later specifications when implemented per Semtech's reference design guidelines.
SX1268IMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- LoRa™
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- LoRaWAN
- Modulation:
- FSK, GFSK, GMSK, MSK
- Frequency:
- 410MHz ~ 810MHz
- Data Rate (Max):
- 300kbps
- Power - Output:
- 22dBm
- Sensitivity:
- -148dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- -
- Voltage - Supply:
- 1.8V ~ 3.7V
- Current - Receiving:
- 4.2mA ~ 10.1mA
- Current - Transmitting:
- 32mA ~ 107mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-QFN (4x4)
SX1268IMLTRT FAQ
1.How can I place an order for SX1268IMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1268IMLTRT 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 SX1268IMLTRT reliable?
The price and inventory of SX1268IMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1268IMLTRT is usually 5 days.
3.What payment methods are accepted for SX1268IMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1268IMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1268IMLTRT?
SX1268IMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1268IMLTRT 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 SX1268IMLTRT?
For technical support, including SX1268IMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1268IMLTRT requirements.
6.How does Aetrix verify that SX1268IMLTRT is sourced from the original manufacturer or authorized distributors?
All SX1268IMLTRT 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 SX1268IMLTRT meets industry standards.
7.What is the process for return or replacement of SX1268IMLTRT?
All SX1268IMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SX1268IMLTRT, 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 SX1268IMLTRT part is unused and in its original packaging.
Return procedure for SX1268IMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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