Silicon Labs
Series 2 multiprotocol wireless SoC: Zigbee, Thread and Bluetooth LE, +20 dBm, 1 MB Flash, QFN32
The Silicon Labs EFR32MG21A020F1024IM32-C is a Mighty Gecko Series 2 2.4 GHz wireless SoC built on an 80 MHz Arm Cortex-M33 with a dedicated security core. It integrates 1024 KB Flash and 96 KB RAM, and a radio with up to +20 dBm output power for Zigbee, Thread, Bluetooth LE and multiprotocol designs such as smart-home hubs, lighting, gateways and building automation nodes. Silicon Labs plans full production until at least April 2029.
Key Specifications
Verify against the original datasheet before quoting.
| Core | Arm Cortex-M33, 80 MHz, with dedicated security core |
|---|---|
| Memory | 1024 KB Flash, 96 KB RAM |
| Radio | 2.4 GHz, up to +20 dBm TX; RX sensitivity −104.3 dBm (250 kbps O-QPSK DSSS) |
| Protocols | Zigbee, Thread, Bluetooth LE, multiprotocol |
| I/O | 20 GPIO |
| Package / temperature | QFN32; −40 °C to +125 °C |
Market Status — as of October 2026
Allocated – Limited Market Stock
Quality & Traceability
Cerametronics is ISO 9001 certified and products are RoHS compliant, with counterfeit screening and full traceability on every shipment. A Certificate of Conformance is available on request. For allocation-sensitive or high-risk lots, independent third-party lab verification can be arranged — just flag it on your RFQ. Any lot that fails incoming inspection is quarantined and never shipped.
FAQ
What does "A020" in the part number mean?
The "020" indicates a maximum transmit power of +20 dBm. Silicon Labs also offers lower-power EFR32MG21 variants (e.g. A010, +10 dBm), so confirm the RF power your design and certification are based on before substituting.
How long will EFR32MG21 be available?
Silicon Labs states a minimum 10-year lifecycle target for this family and expects full production until at least April 2029; any end-of-life notice would come after that date.
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