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Semtech Corporation SX1232IMLTRT
- Part No.:
- SX1232IMLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- RF Transceiver ICs
- Package:
- 24-VQFN Exposed Pad
- Datasheet:
-
SX1232IMLTRT.pdf
- Description:
- IC RF TXRX ISM<1GHZ 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,700
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Product details
Overview
SX1232IMLTRT from Semtech is an ultra-low-power, high-link-budget UHF transceiver for 868 MHz (EN 300 220-1) and 915 MHz (FCC Part 15) ISM bands, featuring -123 dBm sensitivity at 1.2 kbps, +20 dBm RF output, and integrated packet engine with 255-byte payload support. It enables long-life battery-powered M2M and metering systems using alkaline or lithium chemistries.
For engineers reviewing the SX1232IMLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include its low RX current (9.3 mA), 143 dB link budget, FSK/GFSK/MSK/GMSK/OOK modulation support, built-in temperature sensor, and io-homecontrol® compatibility - all in a QFN24 package.
Technical Context
The SX1232IMLTRT implements a Low-IF receiver architecture with automatic gain control (AGC), 115 dB+ dynamic range RSSI, and ultra-fast AFC for robust demodulation of low-modulation-index Gaussian-filtered signals. Its Frac-N PLL synthesizer delivers 61 Hz frequency resolution and supports fast transceiver startup times - 130 µs for TX and 110 µs for RX.
Transmit functionality includes dual internal PAs: one optimized for constant +20 dBm output (PA_BOOST mode), the other for high-efficiency +14 dBm operation (RFO mode). The device integrates a 64-byte FIFO, bit synchronizer with clock recovery, sync word recognition, and preamble detection - all managed via SPI interface and sequencer-controlled operating modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | -123 dBm @ 1.2 kbps - enables reliable reception in weak-signal industrial environments |
| Max Output Power | +20 dBm (100 mW) - sufficient for 1–2 km line-of-sight telemetry without external PA |
| Link Budget | 143 dB - calculated as (TX power) – (RX sensitivity), defining maximum path loss tolerance |
| Modulation Support | FSK, GFSK, MSK, GMSK, OOK - covers legacy and spectrally efficient protocols including io-homecontrol® |
| Bit Rate Range | Programmable up to 300 kbps - supports both narrowband telemetry and higher-throughput sensor reporting |
| RX Current | 9.3 mA @ 868 MHz - minimizes average power in duty-cycled wireless sensor nodes |
| Operating Temp | -40°C to +85°C - qualified for outdoor metering and industrial monitoring deployments |
Pinout & Package
Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), RoHS-compliant, exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBAT1, VBAT2 | Analog/Digital Power Supply | Separate rails for analog core (VBAT1) and digital logic (VBAT2); decoupling critical for noise immunity |
| VR_ANA, VR_DIG, VR_PA | Internal LDO Outputs | Provide regulated 1.6 V analog, 1.6 V digital, and 2.4 V PA supply - no external regulators required |
| RFO | RF Output (High-Efficiency PA) | Drives antenna directly in +14 dBm mode; requires matching network per reference design |
| PA_BOOST | RF Output (High-Power PA) | Enables +20 dBm output; requires external antenna switch and tank inductor per Figure 39 |
| DIO0–DIO5 | Digital I/O Control Signals | Configurable IRQ pins for packet sync, preamble detect, timeout, and FIFO status - enable autonomous low-power sequencing |
| SPI Interface (SCK, MISO, MOSI, NSS) | Serial Configuration Interface | 4-wire SPI (mode 0, CPOL=0, CPHA=0) for register access and packet loading at up to 10 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Packet Engine | Handles variable-length packets up to 255 bytes with hardware CRC-16, address filtering, and automatic whitening |
| io-homecontrol® Mode | Pre-configured timing, modulation, and protocol parameters compliant with EnOcean Alliance specification |
| Built-in Temperature Sensor | ±2°C accuracy over -40°C to +85°C - enables on-chip thermal compensation and system health monitoring |
| Low-Battery Indicator | Dedicated analog comparator monitors VBAT1 threshold; triggers interrupt without host MCU intervention |
| Automatic RF Sense + AFC | Enables rapid channel acquisition and drift correction within <100 µs - essential for burst-mode listening |
Applications
| Smart Metering | Wireless Sensor Networks |
|---|---|
Use Scenario: Battery-powered gas/water/electricity meters transmitting hourly consumption data over 1–3 km in urban RF environments. IC Role / Device Role / Timing Role: Primary RF transceiver handling EN 300 220-compliant 868 MHz burst transmission and listen-before-talk receive cycles. Use Value: 9.3 mA RX current and 100 nA register retention extend lithium battery life beyond 10 years; +20 dBm output ensures link margin in obstructed installations. | Use Scenario: Distributed environmental sensors (temp/humidity/pressure) reporting to gateway every 5–30 minutes in factory or agricultural settings. IC Role / Device Role / Timing Role: Low-power node transceiver implementing adaptive listen intervals and preamble-based wake-up to minimize duty cycle. Use Value: Ultra-fast AFC and 115 dB+ RSSI dynamic range maintain reliable demodulation despite multipath and interferer proximity; GFSK shaping meets spectral mask requirements. |
| Home Automation | Security Systems |
Use Scenario: Wireless window/door contact sensors and thermostats interoperating with io-homecontrol®-certified hubs in European residential buildings. IC Role / Device Role / Timing Role: Protocol-compliant transceiver executing io-homecontrol® timing windows, modulation profiles, and secure frame formatting. Use Value: Factory-programmed io-homecontrol® mode eliminates firmware configuration overhead; built-in sync word recognition enables deterministic packet alignment. | Use Scenario: Battery-operated motion detectors and panic buttons transmitting encrypted alerts to central panel with sub-second latency. IC Role / Device Role / Timing Role: High-reliability transceiver supporting OOK and FSK for legacy and modern alarm protocols, with automatic retransmission on ACK timeout. Use Value: -123 dBm sensitivity ensures detection of weak signals from basement or garage zones; 80 dB blocking immunity rejects nearby Wi-Fi/Bluetooth interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI4432-B1B-FMR | Higher max output (+20 dBm), but lower sensitivity (-117 dBm @ 1.2 kbps); uses different SPI register map and lacks io-homecontrol® mode | Preferred where higher TX power is prioritized over weak-signal RX performance; not suitable for io-homecontrol® certification | Select when legacy Si4432 ecosystem integration is required and sensitivity margin is acceptable |
| AX5043-1-TQ48 | Lower power consumption (RX = 7.5 mA), wider frequency range (27–1050 MHz), but no integrated temperature sensor or low-battery indicator | Better suited for multi-band portable devices; requires external components for battery monitoring and thermal compensation | Choose for flexible frequency planning and ultra-low RX current where auxiliary sensing features are handled externally |
Compared with SI4432-B1B-FMR and AX5043-1-TQ48, the SX1232IMLTRT provides superior sensitivity and integrated system-level features (temperature, battery sense, io-homecontrol®), making it optimal for certified, long-life, single-band utility and home automation endpoints - without requiring additional analog monitoring circuitry.
Availability
SX1232IMLTRT is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, home automation, security systems, and industrial monitoring applications requiring stable component supply and long-term lifecycle support.
Supply support for SX1232IMLTRT 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 ICs for power management, protection, and wireless sensing.
The SX1232IMLTRT belongs to Semtech's Wireless & Sensing product line, designed specifically for ultra-low-power, long-range, regulatory-compliant sub-GHz IoT endpoints in utility, building, and industrial markets.
FAQ
What is the operating frequency range supported by the SX1232IMLTRT?
The SX1232IMLTRT operates in two licensed-free ISM bands: 863–870 MHz for EN 300 220-1 compliance in Europe and 902–928 MHz for FCC Part 15 compliance in North America. Its fractional-N synthesizer achieves 61 Hz step resolution across this range, enabling precise channel placement and hopping. The SX1232IMLTRT does not support 433 MHz or 2.4 GHz bands.
Does the SX1232IMLTRT support both FSK and OOK modulation schemes?
Yes, the SX1232IMLTRT natively supports FSK, GFSK, MSK, GMSK, and OOK modulation formats through dedicated digital modulator blocks. Each mode is configurable via SPI registers, with independent shaping filters and demodulator paths. The SX1232IMLTRT's OOK peak detector and FSK discriminator operate concurrently with automatic mode switching based on packet header flags.
How does the SX1232IMLTRT manage power efficiency in battery-powered applications?
The SX1232IMLTRT achieves ultra-low power operation via multiple hardware features: 9.3 mA RX current, 100 nA register retention in sleep mode, programmable low-duty-cycle listen intervals, and autonomous wake-on-preamble detection. Its dual-PA architecture allows selection between +20 dBm (regulated) and +14 dBm (high-efficiency) modes - letting designers optimize for range or battery life. The SX1232IMLTRT also includes a low-battery comparator that triggers interrupts without MCU involvement.
Is the SX1232IMLTRT pin-compatible with the SX1231 or SX1272 transceivers?
No, the SX1232IMLTRT is not pin-compatible with the SX1231 or SX1272. It uses a unique 24-pin QFN package with distinct power rail assignments (VBAT1/VBAT2, VR_ANA/VR_DIG/VR_PA), dedicated PA_BOOST and RFO outputs, and six DIO pins mapped to specific sequencer events. Register maps, SPI timing, and functional blocks differ significantly - migration requires PCB redesign and firmware rework. The SX1232IMLTRT is a standalone solution optimized for io-homecontrol® and high-link-budget metering.
What reference clock source is required for the SX1232IMLTRT?
The SX1232IMLTRT requires a 32 MHz fundamental-mode crystal or TCXO connected between XTAL1 and XTAL2 pins. The oscillator circuit includes internal load capacitors; external caps are optional and only needed if fine-tuning frequency accuracy beyond ±10 ppm. A 32.768 kHz watch crystal is not supported - the device lacks a secondary oscillator input. The SX1232IMLTRT's RC oscillator serves only as a backup clock during crystal startup or failure.
SX1232IMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 24-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:
- 862Mhz ~ 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:
- 9.3mA
- Current - Transmitting:
- 18mA ~ 125mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-QFN (5x5)
SX1232IMLTRT FAQ
1.How can I place an order for SX1232IMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SX1232IMLTRT 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 SX1232IMLTRT reliable?
The price and inventory of SX1232IMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX1232IMLTRT is usually 5 days.
3.What payment methods are accepted for SX1232IMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX1232IMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX1232IMLTRT?
SX1232IMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX1232IMLTRT 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 SX1232IMLTRT?
For technical support, including SX1232IMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX1232IMLTRT requirements.
6.How does Aetrix verify that SX1232IMLTRT is sourced from the original manufacturer or authorized distributors?
All SX1232IMLTRT 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 SX1232IMLTRT meets industry standards.
7.What is the process for return or replacement of SX1232IMLTRT?
All SX1232IMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SX1232IMLTRT, 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 SX1232IMLTRT part is unused and in its original packaging.
Return procedure for SX1232IMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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