RN41-I/RM Equivalent & Substitute Parts

Part Overview

The RN41-I/RM is a Bluetooth v2.1 +EDR Class 1 transceiver module manufactured by Microchip Technology, designed for 2.4GHz RF applications requiring integrated chip-level Bluetooth connectivity. This module features surface mount packaging with integrated antenna and supports multiple serial interfaces including SPI, UART, and USB. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design considerations.

Substiute Parts

RN41-I/RM

Microchip TechnologyIn Stock: 2188RN41-I/RM Datasheet

Current PartRFQ

BTM443

Laird Connectivity Inc.In Stock: 4840BTM443 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN41-I/RM is determined by the following critical parameters:

Primary Compatibility Criteria:

• RF Family/Standard: Bluetooth protocol support
• Frequency Band: 2.4GHz operation
• Mounting Type: Surface Mount configuration
• Antenna Type: Integrated chip antenna
• Operating Temperature Range: -40°C ~ 85°C minimum
• Supply Voltage Compatibility: Overlapping voltage ranges
• RoHS/REACH Compliance: ROHS3 and REACH Unaffected status

Secondary Consideration Parameters:

• Serial Interface availability (UART as minimum requirement)
• Power output and sensitivity specifications
• Current consumption profiles
• Package form factor compatibility

The BTM443 qualifies as a substitute based on shared Bluetooth v2.1 +EDR protocol support, 2.4GHz frequency operation, surface mount configuration, integrated chip antenna, matching operating temperature range, compatible supply voltage window, and equivalent compliance certifications. Differences in power class (Class 1 vs. Class 2), data rate capability, and serial interface availability represent functional trade-offs that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

RN41-I/RM Status Consideration: The RN41-I/RM is classified as obsolete. Continued procurement may face supply constraints and extended lead times. Active product status of the BTM443 provides improved availability and supply chain stability.

Compliance Alignment: Both modules maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for equivalent applications. MSL ratings are identical at Level 3 (168 Hours), indicating equivalent moisture handling requirements during assembly.

Functional Trade-offs: The BTM443 operates at Bluetooth v2.1 +EDR Class 2 power classification versus the RN41-I/RM Class 1 specification. This results in reduced transmit power (4dBm vs. 16dBm) and communication range. The BTM443 provides higher data rate capability (2.1Mbps vs. 300kbps) and improved receiver sensitivity (-84dBm vs. -80dBm). Serial interface support is limited to UART on the BTM443, eliminating SPI and USB options available on the RN41-I/RM.

Supply Voltage Consideration: The BTM443 maximum supply voltage is 3.3V, while the RN41-I/RM supports up to 3.6V. Systems designed for the full 3.6V range require voltage adjustment or regulation to operate the BTM443 within specification.

Frequently Asked Questions (FAQ)

Q: Can the BTM443 directly replace the RN41-I/RM in existing designs?

A: Direct replacement requires evaluation of three critical factors: (1) Transmit power requirements—the BTM443 Class 2 output (4dBm) provides significantly reduced range compared to Class 1 (16dBm); (2) Serial interface requirements—if SPI or USB communication is required, the BTM443 UART-only interface is incompatible; (3) Supply voltage—systems operating at 3.6V must be modified to operate within the BTM443 maximum of 3.3V.

Q: What are the key differences in power consumption between these modules?

A: The RN41-I/RM draws 65mA during transmission and 35mA during reception. The BTM443 draws 40mA during both transmission and reception. The BTM443 provides lower and more consistent current draw, potentially reducing power supply requirements in battery-powered applications.

Q: Are there compatibility issues with the package form factor?

A: Both modules use surface mount configuration with integrated chip antennas. The RN41-I/RM specifies 35-SMD Module packaging. The BTM443 packaging is specified as Tray. Physical footprint compatibility must be verified against PCB layout and assembly documentation before substitution.

Q: How do the receiver sensitivity specifications compare?

A: The BTM443 provides superior receiver sensitivity at -84dBm compared to the RN41-I/RM at -80dBm. This 4dB improvement in sensitivity partially compensates for the reduced transmit power in range-limited applications, though Class 1 transmit power advantage remains significant.

Q: What is the impact of the data rate difference?

A: The RN41-I/RM supports 300kbps data rate while the BTM443 supports 2.1Mbps. The BTM443 higher data rate enables faster communication and reduced transmission time, which may reduce power consumption in applications with intermittent data transfer requirements.