BLE121LR-A-M256K Equivalent & Substitute Parts

Part Overview

The BLE121LR-A-M256K is a Bluetooth v4.0 transceiver module manufactured by Silicon Labs, designed for 2.4GHz RF applications with integrated antenna and chip-level surface mount packaging. This module integrates the CC2541 IC and provides 256kB Flash and 8kB SRAM memory for Bluetooth connectivity applications. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support, redesigns, and new production requirements.

Substiute Parts

BLE121LR-A-M256K

Silicon LabsIn Stock: 6315BLE121LR-A-M256K Datasheet

Current PartRFQ

BGM210PA32JIA2R

Silicon LabsIn Stock: 10404BGM210PA32JIA2R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The BGM210PA32JIA2R qualifies as a manufacturer-recommended substitute based on the following substitution criteria:

Common Functional Parameters:

• RF Family/Standard: Both are Bluetooth transceiver modules
• Frequency Band: Both operate in the 2.4GHz band (BLE121LR-A-M256K: 2.4GHz; BGM210PA32JIA2R: 2.4GHz ~ 2.4835GHz)
• Data Rate: Both support 2Mbps
• Serial Interfaces: Both include I2C, SPI, and UART (BGM210PA32JIA2R adds ADC, GPIO, I2S, IrDA, PWM)
• Antenna Type: Both feature integrated chip antenna
• Mounting Type: Both are surface mount modules
• Manufacturer: Both manufactured by Silicon Labs
• MSL Rating: Both rated MSL 3 (168 Hours)

Substitution Basis: The BGM210PA32JIA2R represents a technology advancement within the Silicon Labs Bluetooth module portfolio, offering enhanced performance specifications while maintaining core functional compatibility through shared communication interfaces and frequency band operation.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The BLE121LR-A-M256K is obsolete, necessitating substitution for new designs and ongoing production support. The BGM210PA32JIA2R is actively manufactured by Silicon Labs and represents the recommended upgrade path.

Compliance & Certifications: Both modules share identical ECCN (5A992C) and HTSUS (8517.62.0090) classifications. The BGM210PA32JIA2R adds RoHS Compliance certification, meeting modern regulatory requirements for electronic components.

Functional Compatibility: The BGM210PA32JIA2R maintains core Bluetooth transceiver functionality across the 2.4GHz band with equivalent 2Mbps data rate capability. Shared serial interface support (I2C, SPI, UART) ensures protocol-level compatibility for existing communication architectures.

Performance Enhancements: The BGM210PA32JIA2R provides measurable improvements in receiver sensitivity (-104.5dBm vs. -98dBm), transmit power (20dBm vs. 8dBm), and memory capacity (1MB Flash/96kB RAM vs. 256kB Flash/8kB SRAM). These enhancements support more demanding Bluetooth v5.3 applications while maintaining backward compatibility with v4.0 protocol requirements.

Design Considerations: Substitution requires verification of physical PCB layout compatibility due to different module package designations (Module vs. 31-SMD Module). Transmit current specifications differ significantly due to higher output power capability; power supply design should accommodate the extended current range (59.7mA ~ 173mA). Extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin for industrial applications.

Frequently Asked Questions (FAQ)

Q: Can the BGM210PA32JIA2R directly replace the BLE121LR-A-M256K without firmware changes?

A: The BGM210PA32JIA2R maintains I2C, SPI, and UART serial interfaces present in the BLE121LR-A-M256K. However, firmware compatibility depends on application-specific code. The BGM210PA32JIA2R supports Bluetooth v5.3 while the BLE121LR-A-M256K operates on Bluetooth v4.0; applications must be evaluated for protocol-level compatibility requirements.

Q: What are the key electrical differences affecting circuit design?

A: The BGM210PA32JIA2R requires lower minimum supply voltage (1.71V vs. 2V) and exhibits significantly lower receive current (9.1mA ~ 9.9mA vs. 28mA ~ 33mA), improving power efficiency. Transmit current is higher due to increased output power (20dBm vs. 8dBm). Power supply and current budgeting must be recalculated for the substitute module.

Q: Are the module packages physically compatible?

A: The BLE121LR-A-M256K uses a Module package while the BGM210PA32JIA2R uses a 31-SMD Module package. Physical dimensions and pinout may differ; PCB layout verification is required before substitution.

Q: Does the BGM210PA32JIA2R support the same communication protocols?

A: Both modules support I2C, SPI, and UART interfaces. The BGM210PA32JIA2R adds ADC, GPIO, I2S, IrDA, and PWM capabilities. Existing I2C, SPI, and UART implementations are compatible; additional interfaces are optional enhancements.

Q: What is the significance of the extended operating temperature range?

A: The BGM210PA32JIA2R operates from -40°C to 125°C compared to -40°C to 85°C for the BLE121LR-A-M256K. This extended range supports industrial and automotive applications requiring higher temperature tolerance.

Q: Is the BGM210PA32JIA2R suitable for battery-powered applications?

A: The BGM210PA32JIA2R demonstrates improved power efficiency in receive mode (9.1mA ~ 9.9mA vs. 28mA ~ 33mA) and supports lower minimum supply voltage (1.71V). These characteristics make it suitable for battery-powered applications, though transmit current increases with higher output power.

Q: What certifications apply to both modules?

A: Both modules share ECCN 5A992C and HTSUS 8517.62.0090 classifications. The BGM210PA32JIA2R additionally carries RoHS Compliance certification, meeting environmental and regulatory standards for modern electronics manufacturing.