diff --git a/homeassistant/components/stt/__init__.py b/homeassistant/components/stt/__init__.py
index f82d6c2ab93b0..2fb3b652c5c91 100644
--- a/homeassistant/components/stt/__init__.py
+++ b/homeassistant/components/stt/__init__.py
@@ -32,6 +32,7 @@
 from .const import (
     DATA_PROVIDERS,
     DOMAIN,
+    DOMAIN_DATA,
     AudioBitRates,
     AudioChannels,
     AudioCodecs,
@@ -72,11 +73,9 @@
 @callback
 def async_default_engine(hass: HomeAssistant) -> str | None:
     """Return the domain or entity id of the default engine."""
-    component: EntityComponent[SpeechToTextEntity] = hass.data[DOMAIN]
-
     default_entity_id: str | None = None
 
-    for entity in component.entities:
+    for entity in hass.data[DOMAIN_DATA].entities:
         if entity.platform and entity.platform.platform_name == "cloud":
             return entity.entity_id
 
@@ -91,9 +90,7 @@ def async_get_speech_to_text_entity(
     hass: HomeAssistant, entity_id: str
 ) -> SpeechToTextEntity | None:
     """Return stt entity."""
-    component: EntityComponent[SpeechToTextEntity] = hass.data[DOMAIN]
-
-    return component.get_entity(entity_id)
+    return hass.data[DOMAIN_DATA].get_entity(entity_id)
 
 
 @callback
@@ -111,13 +108,11 @@ def async_get_speech_to_text_languages(hass: HomeAssistant) -> set[str]:
     """Return a set with the union of languages supported by stt engines."""
     languages = set()
 
-    component: EntityComponent[SpeechToTextEntity] = hass.data[DOMAIN]
-    legacy_providers: dict[str, Provider] = hass.data[DATA_PROVIDERS]
-    for entity in component.entities:
+    for entity in hass.data[DOMAIN_DATA].entities:
         for language_tag in entity.supported_languages:
             languages.add(language_tag)
 
-    for engine in legacy_providers.values():
+    for engine in hass.data[DATA_PROVIDERS].values():
         for language_tag in engine.supported_languages:
             languages.add(language_tag)
 
@@ -128,7 +123,7 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     """Set up STT."""
     websocket_api.async_register_command(hass, websocket_list_engines)
 
-    component = hass.data[DOMAIN] = EntityComponent[SpeechToTextEntity](
+    component = hass.data[DOMAIN_DATA] = EntityComponent[SpeechToTextEntity](
         _LOGGER, DOMAIN, hass
     )
 
@@ -150,14 +145,12 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
 
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Set up a config entry."""
-    component: EntityComponent[SpeechToTextEntity] = hass.data[DOMAIN]
-    return await component.async_setup_entry(entry)
+    return await hass.data[DOMAIN_DATA].async_setup_entry(entry)
 
 
 async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Unload a config entry."""
-    component: EntityComponent[SpeechToTextEntity] = hass.data[DOMAIN]
-    return await component.async_unload_entry(entry)
+    return await hass.data[DOMAIN_DATA].async_unload_entry(entry)
 
 
 class SpeechToTextEntity(RestoreEntity):
@@ -426,15 +419,12 @@ def websocket_list_engines(
     hass: HomeAssistant, connection: websocket_api.ActiveConnection, msg: dict
 ) -> None:
     """List speech-to-text engines and, optionally, if they support a given language."""
-    component: EntityComponent[SpeechToTextEntity] = hass.data[DOMAIN]
-    legacy_providers: dict[str, Provider] = hass.data[DATA_PROVIDERS]
-
     country = msg.get("country")
     language = msg.get("language")
     providers = []
     provider_info: dict[str, Any]
 
-    for entity in component.entities:
+    for entity in hass.data[DOMAIN_DATA].entities:
         provider_info = {
             "engine_id": entity.entity_id,
             "supported_languages": entity.supported_languages,
@@ -445,7 +435,7 @@ def websocket_list_engines(
             )
         providers.append(provider_info)
 
-    for engine_id, provider in legacy_providers.items():
+    for engine_id, provider in hass.data[DATA_PROVIDERS].items():
         provider_info = {
             "engine_id": engine_id,
             "name": provider.name,
diff --git a/homeassistant/components/stt/const.py b/homeassistant/components/stt/const.py
index 2df5bea03165a..5c805494cef34 100644
--- a/homeassistant/components/stt/const.py
+++ b/homeassistant/components/stt/const.py
@@ -1,9 +1,21 @@
 """STT constante."""
 
+from __future__ import annotations
+
 from enum import Enum
+from typing import TYPE_CHECKING
+
+from homeassistant.util.hass_dict import HassKey
+
+if TYPE_CHECKING:
+    from homeassistant.helpers.entity_component import EntityComponent
+
+    from . import SpeechToTextEntity
+    from .legacy import Provider
 
 DOMAIN = "stt"
-DATA_PROVIDERS = f"{DOMAIN}_providers"
+DOMAIN_DATA: HassKey[EntityComponent[SpeechToTextEntity]] = HassKey(DOMAIN)
+DATA_PROVIDERS: HassKey[dict[str, Provider]] = HassKey(f"{DOMAIN}_providers")
 
 
 class AudioCodecs(str, Enum):
diff --git a/homeassistant/components/stt/legacy.py b/homeassistant/components/stt/legacy.py
index 7bb0d84c289f4..13144eae5b424 100644
--- a/homeassistant/components/stt/legacy.py
+++ b/homeassistant/components/stt/legacy.py
@@ -34,7 +34,8 @@
 @callback
 def async_default_provider(hass: HomeAssistant) -> str | None:
     """Return the domain of the default provider."""
-    return next(iter(hass.data[DATA_PROVIDERS]), None)
+    providers = hass.data[DATA_PROVIDERS]
+    return next(iter(providers), None)
 
 
 @callback
@@ -42,7 +43,7 @@ def async_get_provider(
     hass: HomeAssistant, domain: str | None = None
 ) -> Provider | None:
     """Return provider."""
-    providers: dict[str, Provider] = hass.data[DATA_PROVIDERS]
+    providers = hass.data[DATA_PROVIDERS]
     if domain:
         return providers.get(domain)