EFR32BG29B140F1024IM40

The EFR32BG29B140F1024IM40 is a Bluetooth LE SoC in a 5 mm x 5 mm QFN-40 package, built around a 76.8 MHz Arm Cortex-M33 with 1024 KB of flash and 256 KB of RAM. It supports Bluetooth 5.4 including LE Long Range and 2M PHY modes, transmits at up to +8 dBm — the strongest radio option among the BG29 codes listed here — and exposes 26 GPIOs. The B140 variant uses a buck DC-DC converter for 1.8 V to 3.8 V rails, and the converter's integrated coulomb counter reports battery charge consumption, which simplifies state-of-charge estimation in coin-cell and AA-powered products. Secure Vault High provides the family's top tier of key protection and anti-tamper features for connected locks, meters and medical accessories. The full -40 °C to +125 °C temperature range suits industrial environments where the boost variants below cannot go. Selection note: pick the B140 when your rail is already regulated at 1.8 V to 3.8 V and you want maximum range and temperature headroom; if the product must run from a single low-voltage cell, look at the boost-input B220 or B230 codes instead. Parameters verified against Silicon Labs documentation.