How many Bluetooth Low Energy (BLE) concurrent connections can the BL54L15 support?

BL54L15

Answer

The BL54L15 (powered by Nordic’s nRF54L15 SoC) has been tested with up to 20 concurrent BLE connections at the controller level. Nordic DevZone

However, actual achievable connection count depends on application requirements such as connection interval, throughput, timing, and memory usage. Higher numbers of connections require more controller RAM and tighter timing scheduling, and may not be feasible if your application needs short connection intervals or high throughput per link. Nordic DevZone

In Zephyr/NCS builds, you can configure connection limits using settings like CONFIG_BT_MAX_CONN, but available RAM (especially on the BLE controller core) and stack load will ultimately influence what you can reliably run. Nordic DevZone