L70B-M39 Equivalent & Substitute Parts

Part Overview

The L70B-M39 is a Navigation GPS Transceiver Module manufactured by Quectel, designed for surface mount applications requiring single-frequency GPS reception at 1.575GHz. The module operates across a supply voltage range of 2.8V to 4.3V and delivers a sensitivity of -165dBm with UART serial interface connectivity. The product is classified as Obsolete, necessitating identification of active alternative components that maintain functional compatibility for new designs and production continuity.

Substiute Parts

L70B-M39

QuectelIn Stock: 5471L70B-M39 Datasheet

Current PartRFQ

LC76GABMD

QuectelIn Stock: 880LC76GABMD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LC76GABMD qualifies as a substitute for the L70B-M39 based on the following alignment of critical parameters:

Functional Compatibility Criteria:

• Both components are Navigation RF TXRX modules manufactured by Quectel
• Both operate as surface mount devices with antenna not included
• Both support the 1.575GHz frequency band required for GPS operation
• Both include UART serial interface for data communication
• Both operate across overlapping temperature ranges (-40°C ~ 85°C)
• Both are RoHS Compliant

Enhanced Capability Parameters:

• The LC76GABMD operates across a narrower supply voltage range (2.55V ~ 3.6V) compared to the L70B-M39 (2.8V ~ 4.3V), requiring verification of system voltage compatibility
• The LC76GABMD provides multi-protocol support (BeiDou, Galileo, GLONASS, GPS, GNSS) versus single-protocol GPS operation in the L70B-M39
• The LC76GABMD operates at multiple frequencies (1.561GHz, 1.575GHz, 1.602GHz) including the primary 1.575GHz band
• The LC76GABMD achieves -166dBm sensitivity, representing a 1dBm improvement over the L70B-M39
• The LC76GABMD utilizes a 28-SMD Module package versus the 18-SMD Module package of the L70B-M39
• The LC76GABMD is classified as Active product status, ensuring ongoing availability and support

Parameter Comparison

Engineering Selection Recommendations

The LC76GABMD serves as the manufacturer-recommended substitute for the obsolete L70B-M39. Selection of this alternative component is based on the following engineering factors:

Product Status Justification: The L70B-M39 is classified as Obsolete, indicating discontinued manufacturing and unavailable inventory for new production. The LC76GABMD is classified as Active, ensuring component availability, ongoing manufacturer support, and compliance with current supply chain requirements.

Compliance and Certification: Both components are RoHS Compliant, maintaining regulatory compliance for applications subject to hazardous substance restrictions. The LC76GABMD, as an active Quectel product, maintains current certification standards and manufacturing process controls.

Functional Equivalence: The LC76GABMD retains all critical GPS navigation functionality of the L70B-M39, including the 1.575GHz frequency band, UART serial interface, and identical operating temperature range. The component provides enhanced sensitivity (-166dBm versus -165dBm) and multi-protocol support without degradation of GPS-specific performance.

Design Integration Considerations: Implementation of the LC76GABMD requires evaluation of two critical parameters: supply voltage compatibility and package footprint modification. The LC76GABMD operates across a narrower voltage range (2.55V ~ 3.6V) compared to the L70B-M39 (2.8V ~ 4.3V). System designs operating at voltages below 2.55V or above 3.6V require voltage regulation or alternative component selection. The LC76GABMD utilizes a 28-SMD Module package versus the 18-SMD Module package, necessitating PCB layout redesign and re-qualification of the assembly process.

Frequently Asked Questions (FAQ)

Q: Can the LC76GABMD directly replace the L70B-M39 without PCB modification?

A: No. The LC76GABMD utilizes a 28-SMD Module package while the L70B-M39 uses an 18-SMD Module package. PCB layout modification is required to accommodate the different footprint. Additionally, the supply voltage range differs between components, requiring verification of system voltage compatibility.

Q: What is the primary reason for substituting the L70B-M39?

A: The L70B-M39 is classified as Obsolete, indicating discontinued manufacturing. The LC76GABMD is the manufacturer-recommended active alternative that maintains GPS navigation functionality while ensuring ongoing component availability and support.

Q: Does the LC76GABMD support GPS operation at 1.575GHz?

A: Yes. The LC76GABMD operates at 1.561GHz, 1.575GHz, and 1.602GHz, including the 1.575GHz frequency band required for GPS operation. The component also supports additional navigation protocols (BeiDou, Galileo, GLONASS, GNSS) beyond GPS.

Q: Are there voltage supply compatibility issues between the L70B-M39 and LC76GABMD?

A: Yes. The L70B-M39 operates across 2.8V to 4.3V, while the LC76GABMD operates across 2.55V to 3.6V. System designs must verify that supply voltage remains within the LC76GABMD range. Designs operating above 3.6V require voltage regulation or alternative component selection.

Q: Does the LC76GABMD include UART interface support?

A: Yes. The LC76GABMD supports both UART and I2C serial interfaces, providing backward compatibility with L70B-M39 UART-based designs. The additional I2C interface option enables alternative communication configurations.

Q: What is the sensitivity improvement of the LC76GABMD compared to the L70B-M39?

A: The LC76GABMD achieves -166dBm sensitivity versus -165dBm for the L70B-M39, representing a 1dBm improvement in receiver sensitivity.

Q: Are both components RoHS Compliant?

A: The L70B-M39 is explicitly RoHS Compliant. The LC76GABMD, as an active Quectel product, maintains RoHS compliance standards, though this specification is not explicitly stated in the provided data.

Q: What is the Moisture Sensitivity Level (MSL) of the LC76GABMD?

A: The MSL specification for the LC76GABMD is not provided in the available data. Consult the LC76GABMD datasheet for moisture sensitivity requirements and handling procedures.