diff --git a/soc/arm/st_stm32/stm32h7/Kconfig.defconfig.stm32h7a3xx b/soc/arm/st_stm32/stm32h7/Kconfig.defconfig.stm32h7a3xx
new file mode 100644
index 00000000000..8ad7bb7850d
--- /dev/null
+++ b/soc/arm/st_stm32/stm32h7/Kconfig.defconfig.stm32h7a3xx
@@ -0,0 +1,14 @@
+# ST STM32H7A3X MCU configuration options
+
+# Copyright (c) 2021 Electrolance Solutions
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32H7A3XX
+
+config SOC
+	default "stm32h7a3xx"
+
+config NUM_IRQS
+	default 155
+
+endif # SOC_STM32H7A3XX
diff --git a/soc/arm/st_stm32/stm32h7/Kconfig.soc b/soc/arm/st_stm32/stm32h7/Kconfig.soc
index 299d1ad677f..94206f4bd9a 100644
--- a/soc/arm/st_stm32/stm32h7/Kconfig.soc
+++ b/soc/arm/st_stm32/stm32h7/Kconfig.soc
@@ -41,4 +41,9 @@ config SOC_STM32H753XX
 	select CPU_CORTEX_M7
 	select CPU_HAS_FPU_DOUBLE_PRECISION
 
+config SOC_STM32H7A3XX
+	bool "STM32H7A3XX"
+	select CPU_CORTEX_M7
+	select CPU_HAS_FPU_DOUBLE_PRECISION
+
 endchoice