diff --git a/homeassistant/components/synology_dsm/binary_sensor.py b/homeassistant/components/synology_dsm/binary_sensor.py
index ac930467442..7511953de90 100644
--- a/homeassistant/components/synology_dsm/binary_sensor.py
+++ b/homeassistant/components/synology_dsm/binary_sensor.py
@@ -2,7 +2,6 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
-from typing import Any
 
 from synology_dsm.api.core.security import SynoCoreSecurity
 from synology_dsm.api.storage.storage import SynoStorage
@@ -17,10 +16,10 @@ from homeassistant.const import CONF_DISKS
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity import EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
-from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
 from . import SynoApi
 from .const import DOMAIN
+from .coordinator import SynologyDSMCentralUpdateCoordinator
 from .entity import (
     SynologyDSMBaseEntity,
     SynologyDSMDeviceEntity,
@@ -89,7 +88,9 @@ async def async_setup_entry(
     async_add_entities(entities)
 
 
-class SynoDSMBinarySensor(SynologyDSMBaseEntity, BinarySensorEntity):
+class SynoDSMBinarySensor(
+    SynologyDSMBaseEntity[SynologyDSMCentralUpdateCoordinator], BinarySensorEntity
+):
     """Mixin for binary sensor specific attributes."""
 
     entity_description: SynologyDSMBinarySensorEntityDescription
@@ -97,7 +98,7 @@ class SynoDSMBinarySensor(SynologyDSMBaseEntity, BinarySensorEntity):
     def __init__(
         self,
         api: SynoApi,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, Any]]],
+        coordinator: SynologyDSMCentralUpdateCoordinator,
         description: SynologyDSMBinarySensorEntityDescription,
     ) -> None:
         """Initialize the Synology DSM binary_sensor entity."""
@@ -131,7 +132,7 @@ class SynoDSMStorageBinarySensor(SynologyDSMDeviceEntity, SynoDSMBinarySensor):
     def __init__(
         self,
         api: SynoApi,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, Any]]],
+        coordinator: SynologyDSMCentralUpdateCoordinator,
         description: SynologyDSMBinarySensorEntityDescription,
         device_id: str | None = None,
     ) -> None:
diff --git a/homeassistant/components/synology_dsm/camera.py b/homeassistant/components/synology_dsm/camera.py
index 6dac67cf72d..65520968e1d 100644
--- a/homeassistant/components/synology_dsm/camera.py
+++ b/homeassistant/components/synology_dsm/camera.py
@@ -20,7 +20,6 @@ from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
-from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
 from . import SynoApi
 from .const import (
@@ -29,6 +28,7 @@ from .const import (
     DOMAIN,
     SIGNAL_CAMERA_SOURCE_CHANGED,
 )
+from .coordinator import SynologyDSMCameraUpdateCoordinator
 from .entity import SynologyDSMBaseEntity, SynologyDSMEntityDescription
 from .models import SynologyDSMData
 
@@ -54,17 +54,16 @@ async def async_setup_entry(
         )
 
 
-class SynoDSMCamera(SynologyDSMBaseEntity, Camera):
+class SynoDSMCamera(SynologyDSMBaseEntity[SynologyDSMCameraUpdateCoordinator], Camera):
     """Representation a Synology camera."""
 
     _attr_supported_features = CameraEntityFeature.STREAM
-    coordinator: DataUpdateCoordinator[dict[str, dict[str, SynoCamera]]]
     entity_description: SynologyDSMCameraEntityDescription
 
     def __init__(
         self,
         api: SynoApi,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, SynoCamera]]],
+        coordinator: SynologyDSMCameraUpdateCoordinator,
         camera_id: str,
     ) -> None:
         """Initialize a Synology camera."""
diff --git a/homeassistant/components/synology_dsm/coordinator.py b/homeassistant/components/synology_dsm/coordinator.py
index e2f0f0741f4..9090b945d44 100644
--- a/homeassistant/components/synology_dsm/coordinator.py
+++ b/homeassistant/components/synology_dsm/coordinator.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 
 from datetime import timedelta
 import logging
-from typing import Any
+from typing import Any, TypeVar
 
 import async_timeout
 from synology_dsm.api.surveillance_station.camera import SynoCamera
@@ -23,9 +23,10 @@ from .const import (
 )
 
 _LOGGER = logging.getLogger(__name__)
+_DataT = TypeVar("_DataT")
 
 
-class SynologyDSMUpdateCoordinator(DataUpdateCoordinator):
+class SynologyDSMUpdateCoordinator(DataUpdateCoordinator[_DataT]):
     """DataUpdateCoordinator base class for synology_dsm."""
 
     def __init__(
@@ -46,7 +47,9 @@ class SynologyDSMUpdateCoordinator(DataUpdateCoordinator):
         )
 
 
-class SynologyDSMSwitchUpdateCoordinator(SynologyDSMUpdateCoordinator):
+class SynologyDSMSwitchUpdateCoordinator(
+    SynologyDSMUpdateCoordinator[dict[str, dict[str, Any]]]
+):
     """DataUpdateCoordinator to gather data for a synology_dsm switch devices."""
 
     def __init__(
@@ -78,7 +81,7 @@ class SynologyDSMSwitchUpdateCoordinator(SynologyDSMUpdateCoordinator):
         }
 
 
-class SynologyDSMCentralUpdateCoordinator(SynologyDSMUpdateCoordinator):
+class SynologyDSMCentralUpdateCoordinator(SynologyDSMUpdateCoordinator[None]):
     """DataUpdateCoordinator to gather data for a synology_dsm central device."""
 
     def __init__(
@@ -106,7 +109,9 @@ class SynologyDSMCentralUpdateCoordinator(SynologyDSMUpdateCoordinator):
         return None
 
 
-class SynologyDSMCameraUpdateCoordinator(SynologyDSMUpdateCoordinator):
+class SynologyDSMCameraUpdateCoordinator(
+    SynologyDSMUpdateCoordinator[dict[str, dict[str, SynoCamera]]]
+):
     """DataUpdateCoordinator to gather data for a synology_dsm cameras."""
 
     def __init__(
diff --git a/homeassistant/components/synology_dsm/entity.py b/homeassistant/components/synology_dsm/entity.py
index 1404d933020..0cc17222802 100644
--- a/homeassistant/components/synology_dsm/entity.py
+++ b/homeassistant/components/synology_dsm/entity.py
@@ -2,16 +2,19 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
-from typing import Any
+from typing import Any, TypeVar
 
 from homeassistant.helpers.entity import DeviceInfo, EntityDescription
-from homeassistant.helpers.update_coordinator import (
-    CoordinatorEntity,
-    DataUpdateCoordinator,
-)
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
 
 from .common import SynoApi
 from .const import ATTRIBUTION, DOMAIN
+from .coordinator import (
+    SynologyDSMCentralUpdateCoordinator,
+    SynologyDSMUpdateCoordinator,
+)
+
+_CoordinatorT = TypeVar("_CoordinatorT", bound=SynologyDSMUpdateCoordinator[Any])
 
 
 @dataclass
@@ -26,9 +29,7 @@ class SynologyDSMEntityDescription(EntityDescription, SynologyDSMRequiredKeysMix
     """Generic Synology DSM entity description."""
 
 
-class SynologyDSMBaseEntity(
-    CoordinatorEntity[DataUpdateCoordinator[dict[str, dict[str, Any]]]]
-):
+class SynologyDSMBaseEntity(CoordinatorEntity[_CoordinatorT]):
     """Representation of a Synology NAS entry."""
 
     entity_description: SynologyDSMEntityDescription
@@ -38,7 +39,7 @@ class SynologyDSMBaseEntity(
     def __init__(
         self,
         api: SynoApi,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, Any]]],
+        coordinator: _CoordinatorT,
         description: SynologyDSMEntityDescription,
     ) -> None:
         """Initialize the Synology DSM entity."""
@@ -67,13 +68,15 @@ class SynologyDSMBaseEntity(
         await super().async_added_to_hass()
 
 
-class SynologyDSMDeviceEntity(SynologyDSMBaseEntity):
+class SynologyDSMDeviceEntity(
+    SynologyDSMBaseEntity[SynologyDSMCentralUpdateCoordinator]
+):
     """Representation of a Synology NAS disk or volume entry."""
 
     def __init__(
         self,
         api: SynoApi,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, Any]]],
+        coordinator: SynologyDSMCentralUpdateCoordinator,
         description: SynologyDSMEntityDescription,
         device_id: str | None = None,
     ) -> None:
diff --git a/homeassistant/components/synology_dsm/sensor.py b/homeassistant/components/synology_dsm/sensor.py
index 156dbe3e79c..0a0779b1979 100644
--- a/homeassistant/components/synology_dsm/sensor.py
+++ b/homeassistant/components/synology_dsm/sensor.py
@@ -26,11 +26,11 @@ from homeassistant.const import (
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity import EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
-from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 from homeassistant.util.dt import utcnow
 
 from . import SynoApi
 from .const import CONF_VOLUMES, DOMAIN, ENTITY_UNIT_LOAD
+from .coordinator import SynologyDSMCentralUpdateCoordinator
 from .entity import (
     SynologyDSMBaseEntity,
     SynologyDSMDeviceEntity,
@@ -328,7 +328,9 @@ async def async_setup_entry(
     async_add_entities(entities)
 
 
-class SynoDSMSensor(SynologyDSMBaseEntity, SensorEntity):
+class SynoDSMSensor(
+    SynologyDSMBaseEntity[SynologyDSMCentralUpdateCoordinator], SensorEntity
+):
     """Mixin for sensor specific attributes."""
 
     entity_description: SynologyDSMSensorEntityDescription
@@ -336,7 +338,7 @@ class SynoDSMSensor(SynologyDSMBaseEntity, SensorEntity):
     def __init__(
         self,
         api: SynoApi,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, Any]]],
+        coordinator: SynologyDSMCentralUpdateCoordinator,
         description: SynologyDSMSensorEntityDescription,
     ) -> None:
         """Initialize the Synology DSM sensor entity."""
@@ -383,7 +385,7 @@ class SynoDSMStorageSensor(SynologyDSMDeviceEntity, SynoDSMSensor):
     def __init__(
         self,
         api: SynoApi,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, Any]]],
+        coordinator: SynologyDSMCentralUpdateCoordinator,
         description: SynologyDSMSensorEntityDescription,
         device_id: str | None = None,
     ) -> None:
@@ -410,7 +412,7 @@ class SynoDSMInfoSensor(SynoDSMSensor):
     def __init__(
         self,
         api: SynoApi,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, Any]]],
+        coordinator: SynologyDSMCentralUpdateCoordinator,
         description: SynologyDSMSensorEntityDescription,
     ) -> None:
         """Initialize the Synology SynoDSMInfoSensor entity."""
diff --git a/homeassistant/components/synology_dsm/switch.py b/homeassistant/components/synology_dsm/switch.py
index 26909ceddd9..245b8804488 100644
--- a/homeassistant/components/synology_dsm/switch.py
+++ b/homeassistant/components/synology_dsm/switch.py
@@ -12,10 +12,10 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
-from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
 from . import SynoApi
 from .const import DOMAIN
+from .coordinator import SynologyDSMSwitchUpdateCoordinator
 from .entity import SynologyDSMBaseEntity, SynologyDSMEntityDescription
 from .models import SynologyDSMData
 
@@ -54,17 +54,18 @@ async def async_setup_entry(
         )
 
 
-class SynoDSMSurveillanceHomeModeToggle(SynologyDSMBaseEntity, SwitchEntity):
+class SynoDSMSurveillanceHomeModeToggle(
+    SynologyDSMBaseEntity[SynologyDSMSwitchUpdateCoordinator], SwitchEntity
+):
     """Representation a Synology Surveillance Station Home Mode toggle."""
 
-    coordinator: DataUpdateCoordinator[dict[str, dict[str, bool]]]
     entity_description: SynologyDSMSwitchEntityDescription
 
     def __init__(
         self,
         api: SynoApi,
         version: str,
-        coordinator: DataUpdateCoordinator[dict[str, dict[str, bool]]],
+        coordinator: SynologyDSMSwitchUpdateCoordinator,
         description: SynologyDSMSwitchEntityDescription,
     ) -> None:
         """Initialize a Synology Surveillance Station Home Mode."""
@@ -78,7 +79,7 @@ class SynoDSMSurveillanceHomeModeToggle(SynologyDSMBaseEntity, SwitchEntity):
     @property
     def is_on(self) -> bool:
         """Return the state."""
-        return self.coordinator.data["switches"][self.entity_description.key]
+        return self.coordinator.data["switches"][self.entity_description.key]  # type: ignore[no-any-return]
 
     async def async_turn_on(self, **kwargs: Any) -> None:
         """Turn on Home mode."""
diff --git a/homeassistant/components/synology_dsm/update.py b/homeassistant/components/synology_dsm/update.py
index 445e682651c..18200fb30d9 100644
--- a/homeassistant/components/synology_dsm/update.py
+++ b/homeassistant/components/synology_dsm/update.py
@@ -14,6 +14,7 @@ from homeassistant.helpers.entity import EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from .const import DOMAIN
+from .coordinator import SynologyDSMCentralUpdateCoordinator
 from .entity import SynologyDSMBaseEntity, SynologyDSMEntityDescription
 from .models import SynologyDSMData
 
@@ -46,7 +47,9 @@ async def async_setup_entry(
     )
 
 
-class SynoDSMUpdateEntity(SynologyDSMBaseEntity, UpdateEntity):
+class SynoDSMUpdateEntity(
+    SynologyDSMBaseEntity[SynologyDSMCentralUpdateCoordinator], UpdateEntity
+):
     """Mixin for update entity specific attributes."""
 
     entity_description: SynologyDSMUpdateEntityEntityDescription