SX1276/77/79

Part: Semtech SX1276/77/78/79

Type: Low Power Long Range Transceiver

Description: The Semtech SX1276/77/78/79 are low power long range transceivers featuring LoRa™ modulation, operating from 137 MHz to 1020 MHz with a maximum link budget of 168 dB, +20 dBm RF output, and -148 dBm sensitivity.

Operating Conditions:

• Supply voltage: 1.8–3.7 V
• Operating temperature: -40 to +85 °C
• Frequency range: 137 MHz to 1020 MHz

Absolute Maximum Ratings:

• Max supply voltage: 3.9 V
• Max junction/storage temperature: -55 to +150 °C

Key Specs:

• Frequency Range: 137 MHz to 1020 MHz
• LoRa™ Sensitivity: -148 dBm
• Maximum RF Output Power: +20 dBm (100 mW)
• LoRa™ RX Current: 9.9 mA (Typ)
• Register Retention Current: 200 nA (Typ)
• Programmable Bit Rate: up to 300 kbps
• Frequency Synthesizer Resolution: 61 Hz
• Maximum Link Budget: 168 dB

Features:

• LoRa™ Modem
• 168 dB maximum link budget
• +20 dBm - 100 mW constant RF output vs. V supply
• High sensitivity: down to -148 dBm
• Low RX current of 9.9 mA, 200 nA register retention
• FSK, GFSK, MSK, GMSK, LoRa™ and OOK modulation
• Built-in temperature sensor and low battery indicator

Applications:

• Automated Meter Reading.
• Home and Building Automation.
• Wireless Alarm and Security Systems.
• Industrial Monitoring and Control
• Long range Irrigation Systems

Package:

• QFN 28 Package
• Wafer Form

•  LoRa TM Modem
•  168 dB maximum link budget
•  +20 dBm - 100 mW constant RF output vs. V supply
•  +14 dBm high efficiency PA
•  Programmable bit rate up to 300 kbps
•  High sensitivity: down to -148 dBm
•  Bullet-proof front end: IIP3 = -11 dBm
•  Excellent blocking immunity
•  Low RX current of 9.9 mA, 200 nA register retention
•  Fully integrated synthesizer with a resolution of 61 Hz
•  FSK, GFSK, MSK, GMSK, LoRa TM and OOK modulation
•  Built-in bit synchronizer for clock recovery
•  Preamble detection
•  127 dB Dynamic Range RSSI
•  Automatic RF Sense and CAD with ultra-fast AFC
•  Packet engine up to 256 bytes with CRC
•  Built-in temperature sensor and low battery indicator

•  Automated Meter Reading.
•  Home and Building Automation.
•  Wireless Alarm and Security Systems.
•  Industrial Monitoring and Control
•  Long range Irrigation Systems

Table 2 Pin Description

Stresses above the values listed below may cause permanent device failure. Exposure to absolute maximum ratings for extended periods may affect device reliability.

Table 3 Absolute Maximum Ratings

Note Specific ratings apply to +20 dBm operation (see Section 5.4.3).

Table 5 Thermal Properties

The SX1276/77/78/79 is available in a 28-lead QFN package as shown in Figure 57.

Figure 57. Package Outline Drawing

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