RM191-SM RF Transceiver Module Equivalent & Substitute Parts

Part Overview

The RM191-SM is a General ISM < 1GHz LoRa™ Transceiver Module manufactured by Laird Connectivity Inc., designed for wireless communication applications operating in the 902MHz to 928MHz frequency band. This surface mount module integrates RF transmission and reception capabilities with multiple serial interfaces (I2C, SPI, UART) and operates across an industrial temperature range of -40°C to 85°C.

The RM191-SM is currently designated as Last Time Buy, indicating that this component is approaching end-of-life status. Identifying equivalent and substitute parts is necessary for design continuity, long-term product support, and supply chain planning.

Substiute Parts

RM191-SM

Laird Connectivity Inc.In Stock: 4662RM191-SM Datasheet

Current PartRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RM191-SM must satisfy the following critical parameters to ensure functional and mechanical compatibility:

Primary Substitution Criteria:

• RF Family/Standard: General ISM < 1GHz
• Protocol: LoRa™
• Frequency Range: 902MHz ~ 928MHz (North American ISM band)
• Serial Interfaces: I2C, SPI, UART (minimum requirement)
• Antenna Connector: U.FL surface mount
• Voltage Supply Range: 1.8V ~ 3.6V
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 85°C (minimum)
• Package Type: Module
• RoHS Compliance: ROHS3 Compliant

Secondary Compatibility Factors:

• Power Output: 15dBm (acceptable range: 14dBm to 20dBm)
• Data Rate: 1Mbps (acceptable range: 1Mbps to 50kbps)
• Current Transmitting: 58mA (acceptable range: 50mA to 100mA)

Currently, no substitute parts have been identified in the provided database that meet all specified parameters for the RM191-SM. The combination of LoRa™ protocol, 902-928MHz frequency band, U.FL antenna connector, and surface mount module packaging represents a specific product category with limited alternatives in the market.

Parameter Comparison

Engineering Selection Recommendations

Given the Last Time Buy status of the RM191-SM, the following engineering considerations apply:

Supply Chain Planning: Secure adequate inventory of RM191-SM components during the remaining availability window. The current stock of 4583 pieces represents the final production lot.

Compliance Verification: The RM191-SM maintains ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic components in industrial and commercial applications.

Long-Term Design Strategy: For new product designs or redesigns, evaluate alternative LoRa™ transceiver modules from other manufacturers that maintain equivalent electrical specifications and surface mount packaging. Ensure any alternative maintains the same serial interface configuration (I2C, SPI, UART) and operating temperature range.

Certification Alignment: The ECCN classification (5A992C) and HTSUS code (8517.62.0090) should be verified for any substitute component to ensure consistent export compliance and tariff classification.

Frequently Asked Questions (FAQ)

Q: Why are no substitute parts listed for the RM191-SM?

A: The RM191-SM combines specific technical requirements—LoRa™ protocol, 902-928MHz frequency band, U.FL antenna connector, and surface mount module packaging—that define a narrow product category. No equivalent parts meeting all specified parameters are currently available in the component database.

Q: Can I use a different antenna connector type as a substitute?

A: No. The U.FL connector is a mechanical and electrical interface requirement. Substituting with SMA, MMCX, or other connector types would require circuit board redesign and antenna recalibration, disqualifying it as a direct substitute.

Q: What if I need a LoRa™ module for a different frequency band?

A: Modules operating in different ISM bands (433MHz, 868MHz, or 915MHz variants) are not substitutes for the 902-928MHz RM191-SM. Frequency band selection is application-specific and cannot be changed without regulatory and hardware modifications.

Q: Is the RM191-SM compatible with non-LoRa™ wireless protocols?

A: No. The RM191-SM is specifically designed for LoRa™ protocol operation. Substitutes must support LoRa™ to maintain protocol compatibility with existing network infrastructure.

Q: What serial interface options are required for substitution?

A: Any substitute must support I2C, SPI, and UART interfaces. These are the minimum communication protocols required for integration with standard microcontroller platforms.

Q: Does the operating temperature range affect substitution eligibility?

A: Yes. The -40°C to 85°C operating range is mandatory for industrial applications. Substitutes with narrower temperature ranges (e.g., 0°C to 70°C) are not acceptable for equivalent replacement.

Q: Can I substitute based on power output alone?

A: No. Power output (15dBm) is one of many parameters. A substitute must meet all specified criteria: frequency band, protocol, interfaces, antenna type, voltage supply, temperature range, and compliance certifications.