EM357-IRT Equivalent & Substitute Parts Reference

Part Overview

The EM357-IRT is an IEEE 802.15.4 2.4GHz System-on-Chip (SoC) manufactured by Silicon Labs, integrating RF transceiver and microcontroller functionality for Zigbee applications. This device is classified as obsolete, necessitating identification of active alternative components for new designs and ongoing production requirements. The EM357-IRT provides 192kB Flash and 12kB RAM with integrated 802.15.4 protocol support and operates across a 2.1V to 3.6V supply range.

Substiute Parts

EM357-IRT

Silicon LabsIn Stock: 720EM357-IRT Datasheet

Current PartRFQ

EFR32MG24A010F1024IM48-B

Silicon LabsIn Stock: 685EFR32MG24A010F1024IM48-B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EM357-IRT is determined by the following critical parameters:

• Package Compatibility: Both devices must use 48-pin VFQFN with exposed pad to ensure PCB layout and thermal management compatibility
• Mounting Type: Surface mount requirement maintained across all alternatives
• Supply Voltage Range: Substitute must operate within or encompass the 2.1V to 3.6V range
• RF Frequency Band: 2.4GHz operation is mandatory for frequency allocation compliance
• Manufacturer Ecosystem: Silicon Labs components ensure software tool compatibility and development environment continuity
• Product Status: Active status preferred to ensure long-term availability and support

The EFR32MG24A010F1024IM48-B qualifies as a manufacturer-recommended substitute based on identical package geometry, matching frequency band, compatible supply voltage envelope, and active product status from the same manufacturer.

Parameter Comparison

Engineering Selection Recommendations

The EFR32MG24A010F1024IM48-B is the manufacturer-recommended substitute for the obsolete EM357-IRT. Selection is justified on the following engineering criteria:

• Active Product Status: The EFR32MG24A010F1024IM48-B maintains active production status, ensuring component availability, technical support, and long-term supply chain stability
• Regulatory Compliance: Both devices maintain equivalent RoHS compliance certifications (RoHS Compliant vs. ROHS3 Compliant), satisfying environmental and hazardous substance restrictions
• Package Geometry: Identical 48-VFQFN exposed pad package ensures direct PCB layout compatibility without redesign
• Supply Voltage Compatibility: The substitute's 1.71V to 3.8V range encompasses the original 2.1V to 3.6V specification, maintaining power supply design compatibility
• Thermal Operating Range: Extended temperature range (-40°C to 125°C vs. -40°C to 85°C) provides broader operational envelope
• Manufacturer Continuity: Both components originate from Silicon Labs, ensuring development tool compatibility and firmware migration pathways

Frequently Asked Questions (FAQ)

Q: Can the EFR32MG24A010F1024IM48-B be used as a direct pin-for-pin replacement?

A: Both devices use the 48-VFQFN exposed pad package. However, the supplier device package dimensions differ (7x7 vs. 6x6), which may affect thermal performance and PCB layout considerations. Verify pinout compatibility and thermal pad requirements in the respective datasheets before implementation.

Q: What are the key differences in memory capacity?

A: The EFR32MG24A010F1024IM48-B provides significantly larger memory: 1024kB Flash and 128kB RAM compared to the EM357-IRT's 192kB Flash and 12kB RAM. This enhancement supports more complex firmware implementations and larger application code bases.

Q: Are the RF protocols compatible?

A: The EM357-IRT implements IEEE 802.15.4 Zigbee protocol, while the EFR32MG24A010F1024IM48-B supports Bluetooth v5.3. These are distinct RF protocols operating in the same 2.4GHz frequency band. Protocol compatibility depends on application requirements and cannot be assumed without explicit design verification.

Q: What supply voltage considerations apply?

A: The substitute device operates across 1.71V to 3.8V, which encompasses the original 2.1V to 3.6V range. Existing power supply designs remain compatible. The extended lower voltage limit (1.71V) may enable additional power optimization strategies in new designs.

Q: How do the GPIO counts compare?

A: The EFR32MG24A010F1024IM48-B provides 32 GPIO pins versus the EM357-IRT's 24 GPIO pins. Additional GPIO availability supports expanded peripheral integration without requiring external I/O expansion components.

Q: What is the significance of the different supplier device package dimensions?

A: The EM357-IRT uses a 7x7mm QFN package while the EFR32MG24A010F1024IM48-B uses a 6x6mm QFN package. Both maintain the 48-pin VFQFN configuration, but the smaller footprint of the substitute may require PCB layout optimization, particularly for thermal management and trace routing around the exposed pad.