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LG77LIAMD Navigation GNSS Transceiver Module
Part Overview
The LG77LIAMD is a multi-constellation navigation transceiver module manufactured by Quectel, designed for GNSS applications supporting BeiDou, GLONASS, and GPS protocols. This surface-mount module operates across the L-band frequency spectrum (1.561GHz, 1.575GHz, 1.602GHz) and integrates I2C and UART serial interfaces for system integration.
The LG77LIAMD carries an obsolete product status, indicating that Quectel has discontinued active production and support. Identifying equivalent substitute parts is necessary to ensure continued component availability, maintain supply chain reliability, and support long-term product maintenance and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LG77LIAMD |
| Manufacturer | Quectel |
| Series | LG77L |
| Product Status | Obsolete |
| RF Family/Standard | Navigation |
| Protocol Support | BeiDou, GLONASS, GPS, GNSS |
| Frequency | 1.561GHz, 1.575GHz, 1.602GHz |
| Sensitivity | -158dBm |
| Serial Interfaces | I2C, UART |
| Voltage Supply Range | 2.8V ~ 4.3V |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 85°C |
| Package/Case | 43-SMD Module |
| Antenna Type | Antenna Not Included |
Substitute Part Grouping Explanation
Substitution eligibility for the LG77LIAMD is determined by strict alignment across the following critical parameters:
Mandatory Matching Parameters:
- Series designation (LG77L)
- Mounting type (Surface Mount)
- Package/case format (43-SMD Module)
- Voltage supply range (2.8V ~ 4.3V)
- Operating temperature range (-40°C ~ 85°C)
- Serial interface support (I2C, UART)
- Frequency band coverage (1.561GHz, 1.575GHz, 1.602GHz)
- Antenna configuration (Antenna Not Included)
The LG77LICMD qualifies as a direct substitute based on full compliance with all mandatory parameters. The substitute part maintains identical electrical specifications, mechanical form factor, and interface requirements while offering enhanced protocol support and improved receiver sensitivity.
Parameter Comparison
| Parameter | LG77LIAMD (Main Part) | LG77LICMD (Substitute) |
|---|---|---|
| Manufacturer | Quectel | Quectel |
| Series | LG77L | LG77L |
| Product Status | Obsolete | Active |
| Protocol Support | BeiDou, GLONASS, GPS, GNSS | BeiDou, Galileo, GLONASS, GPS, GNSS |
| Frequency | 1.561GHz, 1.575GHz, 1.602GHz | 1.561GHz, 1.575GHz, 1.602GHz |
| Sensitivity | -158dBm | -163dBm |
| Serial Interfaces | I2C, UART | I2C, UART |
| Voltage Supply Range | 2.8V ~ 4.3V | 2.8V ~ 4.3V |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Package/Case | 43-SMD Module | 43-SMD Module |
| Antenna Type | Antenna Not Included | Antenna Not Included |
Engineering Selection Recommendations
The LG77LICMD is the designated manufacturer-recommended substitute for the obsolete LG77LIAMD. Selection of the LG77LICMD is appropriate for the following conditions:
Active Production Requirements: New designs and production builds must utilize the LG77LICMD, as the LG77LIAMD is no longer manufactured or supported by Quectel.
Existing Design Compatibility: Designs currently implemented with the LG77LIAMD can transition to the LG77LICMD without modification to PCB layout, power supply architecture, or firmware interface protocols, provided that the existing design does not explicitly exclude Galileo protocol support.
Enhanced Capability: The LG77LICMD provides improved receiver sensitivity (-163dBm versus -158dBm) and extended protocol support including Galileo constellation, delivering superior positioning accuracy and availability in multi-constellation environments.
Supply Chain Continuity: The LG77LICMD maintains 5900 units in current inventory, ensuring reliable component availability for production and maintenance activities.
Frequently Asked Questions (FAQ)
Q: Can the LG77LICMD be used as a direct replacement for the LG77LIAMD in existing designs?
A: Yes. The LG77LICMD maintains identical electrical specifications, mounting configuration, and interface protocols. No PCB redesign or firmware modification is required for substitution.
Q: What is the primary difference between the LG77LIAMD and LG77LICMD?
A: The LG77LICMD adds Galileo constellation support and provides improved receiver sensitivity (-163dBm compared to -158dBm). Both modules support BeiDou, GLONASS, and GPS protocols and operate within identical voltage and temperature ranges.
Q: Does the LG77LICMD require external antenna components?
A: No. Both the LG77LIAMD and LG77LICMD are supplied without integrated antennas. External antenna components must be provided by the system designer.
Q: Are the serial interface protocols identical between the two modules?
A: Yes. Both modules support I2C and UART serial interfaces with identical electrical specifications and protocol implementations.
Q: What is the significance of the LG77LIAMD being marked as obsolete?
A: Obsolete status indicates that Quectel has discontinued manufacturing and technical support for this part number. The LG77LICMD is the active replacement and should be specified for all new designs and procurement activities.
Q: Can both modules operate within the same power supply voltage range?
A: Yes. Both modules require a supply voltage between 2.8V and 4.3V and operate across the identical temperature range of -40°C to 85°C.
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