EM250-RT Equivalent & Substitute Parts

Part Overview

The EM250-RT is a Silicon Labs RF transceiver with integrated microcontroller designed for 802.15.4 Zigbee 2.4GHz applications. This device combines a wireless transceiver and MCU in a 48-VFQFN package, offering 128kB Flash memory and 5kB SRAM with support for I2C, SPI, and UART interfaces.

The EM250-RT has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems currently deployed with this component.

Substiute Parts

EM250-RT

Silicon LabsIn Stock: 1459EM250-RT Datasheet

Current PartRFQ

EFR32MG22C224F512IM40-C

Silicon LabsIn Stock: 1492EFR32MG22C224F512IM40-C Datasheet

MFR RecommendedRFQ

EFR32MG13P732F512GM48-D

Silicon LabsIn Stock: 3728EFR32MG13P732F512GM48-D Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the EM250-RT is determined by the following critical parameters:

Primary Compatibility Criteria:

• Manufacturer: Silicon Labs (maintains firmware and tool ecosystem compatibility)
• Type: TxRx + MCU (integrated transceiver and microcontroller architecture)
• Protocol Support: Zigbee® (primary wireless protocol requirement)
• Frequency Band: 2.4GHz (ISM band operation)
• Package Type: VFQFN with exposed pad (physical and thermal interface compatibility)
• Serial Interfaces: I2C, SPI, UART (communication protocol support)

Secondary Compatibility Considerations:

• Memory capacity (Flash and RAM must meet or exceed application requirements)
• GPIO count (must support existing pin assignments)
• Supply voltage range (must overlap with system power architecture)
• Operating temperature range (must cover deployment environment)
• RF performance parameters (output power, sensitivity, data rate)

The two substitute parts listed below maintain Zigbee protocol support and are from the same manufacturer's active product lines, ensuring continued access to development tools, firmware updates, and technical support.

Parameter Comparison

Engineering Selection Recommendations

EFR32MG13P732F512GM48-D is the primary substitute for EM250-RT applications. This part maintains the 48-VFQFN package footprint, ensuring direct PCB compatibility without layout modifications. The EFR32MG13P732 series supports 802.15.4, Bluetooth v5.0, Thread, and Zigbee protocols, providing extended protocol flexibility while preserving Zigbee functionality. The device offers significantly increased memory (512kB Flash, 64kB RAM versus 128kB Flash, 5kB SRAM), enhanced GPIO count (31 versus 17), and improved RF sensitivity (-103.3dBm versus -99dBm). Operating temperature range matches the original (-40°C to 85°C). Product status is Active with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

EFR32MG22C224F512IM40-C is an alternative substitute for applications where package size reduction is acceptable. This part uses a 40-VFQFN package (5x5mm versus 7x7mm), requiring PCB redesign. The EFR32MG22C224 series supports Bluetooth v5.2 and Zigbee protocols with extended operating temperature range (-40°C to 125°C). Memory capacity (512kB Flash, 32kB RAM) and GPIO count (26) exceed the original specification. This option is suitable for new designs or redesigns where the smaller footprint provides board space advantages. Product status is Active with ROHS3 compliance.

Both substitutes are manufactured by Silicon Labs, maintaining compatibility with existing development environments, software stacks, and technical support channels. Selection between these options depends on PCB layout constraints and application-specific protocol requirements.

Frequently Asked Questions (FAQ)

Q: Can the EFR32MG13P732F512GM48-D be used as a direct replacement for the EM250-RT without PCB modifications?

A: Yes. The EFR32MG13P732F512GM48-D uses the same 48-VFQFN package with exposed pad, providing identical footprint and pinout compatibility. No PCB layout changes are required for physical integration.

Q: What are the key differences in memory between the EM250-RT and its substitutes?

A: The EM250-RT provides 128kB Flash and 5kB SRAM. Both substitute parts offer significantly larger memory: EFR32MG13P732F512GM48-D provides 512kB Flash and 64kB RAM, while EFR32MG22C224F512IM40-C provides 512kB Flash and 32kB RAM. Applications must verify that firmware and data storage requirements are compatible with the original memory constraints before migration.

Q: Are the substitute parts compatible with existing Zigbee firmware?

A: Both substitute parts support Zigbee protocol. However, firmware compatibility depends on application-specific code and Silicon Labs software stack versions. Firmware porting and validation are required to ensure functional equivalence.

Q: What is the impact of the package change for the EFR32MG22C224F512IM40-C?

A: The EFR32MG22C224F512IM40-C uses a 40-VFQFN package (5x5mm) instead of the 48-VFQFN package (7x7mm). This requires PCB redesign, including footprint changes, trace routing modifications, and thermal management adjustments. This option is not suitable for direct replacement on existing boards.

Q: How do the RF performance characteristics compare?

A: The EM250-RT provides 5dBm output power and -99dBm sensitivity. The EFR32MG13P732F512GM48-D offers superior sensitivity (-103.3dBm) and higher output power (19dBm). The EFR32MG22C224F512IM40-C provides 6dBm output power and -106.7dBm sensitivity. Enhanced RF performance in the substitutes may improve link budget and range in Zigbee deployments.

Q: What is the operating temperature range difference?

A: The EM250-RT and EFR32MG13P732F512GM48-D both operate from -40°C to 85°C. The EFR32MG22C224F512IM40-C extends the upper limit to 125°C, providing wider temperature margin for industrial or automotive applications.

Q: Are both substitute parts currently available?

A: Both substitute parts have Active product status with current inventory availability. The EM250-RT is Obsolete and no longer manufactured. For new designs or long-term production planning, the Active substitutes are recommended.