diff --git a/esphome/core/component.cpp b/esphome/core/component.cpp
index 00a36fce3d..8f9d6e0165 100644
--- a/esphome/core/component.cpp
+++ b/esphome/core/component.cpp
@@ -280,8 +280,8 @@ bool Component::should_warn_of_blocking(uint32_t blocking_time) {
     // Set new threshold: blocking_time + increment, converted back to centiseconds
     uint32_t new_threshold_ms = blocking_time + WARN_IF_BLOCKING_INCREMENT_MS;
     uint32_t new_cs = new_threshold_ms / 10U;
-    // Saturate at uint8_t max (255 = 2550ms)
-    this->warn_if_blocking_over_ = static_cast<uint8_t>(new_cs > 255U ? 255U : new_cs);
+    // Saturate at 7-bit max (127 = 1270ms)
+    this->warn_if_blocking_over_ = static_cast<uint16_t>(new_cs > 127U ? 127U : new_cs);
     return true;
   }
   return false;
@@ -543,6 +543,6 @@ void clear_setup_priority_overrides() {
 #endif
 
 // Weak default for component_source_lookup - overridden by generated code
-__attribute__((weak)) const LogString *component_source_lookup(uint8_t) { return LOG_STR("<unknown>"); }
+__attribute__((weak)) const LogString *component_source_lookup(uint16_t) { return LOG_STR("<unknown>"); }
 
 }  // namespace esphome
diff --git a/esphome/core/component.h b/esphome/core/component.h
index c390a205f0..fd57478291 100644
--- a/esphome/core/component.h
+++ b/esphome/core/component.h
@@ -90,7 +90,7 @@ inline constexpr uint8_t WARN_IF_BLOCKING_OVER_CS = 5U;  // 50ms in centiseconds
 
 /// Lookup component source name by index (1-based). Generated by Python codegen.
 /// Weak default returns "<unknown>" so builds without codegen still link.
-const LogString *component_source_lookup(uint8_t index);
+const LogString *component_source_lookup(uint16_t index);
 
 class Component {
  public:
@@ -300,7 +300,7 @@ class Component {
    * This is set by the ESPHome core during setup, and should not be called manually.
    * @param index 1-based index into the component source lookup table (0 = not set)
    */
-  void set_component_source_(uint8_t index) { this->component_source_index_ = index; }
+  void set_component_source_(uint16_t index) { this->component_source_index_ = index; }
 
   virtual void call_setup();
   void call_dump_config_();
@@ -519,8 +519,9 @@ class Component {
   void status_clear_error_slow_path_();
 
   // Ordered for optimal packing on 32-bit systems (8 bytes total with vtable)
-  uint8_t component_source_index_{0};  ///< Index into component source PROGMEM lookup table (0 = not set)
-  uint8_t warn_if_blocking_over_{WARN_IF_BLOCKING_OVER_CS};  ///< Warn threshold in centiseconds (max 2550ms)
+  // Bitfield packs into 16 bits: 9-bit source index (0-511) + 7-bit blocking threshold (0-127 centiseconds)
+  uint16_t component_source_index_ : 9 {0};  ///< Index into component source PROGMEM lookup table (0 = not set)
+  uint16_t warn_if_blocking_over_ : 7 {WARN_IF_BLOCKING_OVER_CS};  ///< Warn threshold in centiseconds (max 1270ms)
   /// State of this component - each bit has a purpose:
   /// Bits 0-2: Component state (0x00=CONSTRUCTION, 0x01=SETUP, 0x02=LOOP, 0x03=FAILED, 0x04=LOOP_DONE)
   /// Bit 3: STATUS_LED_WARNING
diff --git a/esphome/cpp_helpers.py b/esphome/cpp_helpers.py
index e7ff2965c8..66fe24b470 100644
--- a/esphome/cpp_helpers.py
+++ b/esphome/cpp_helpers.py
@@ -26,8 +26,8 @@ _LOGGER = logging.getLogger(__name__)
 
 _COMPONENT_SOURCE_DOMAIN = "component_source_pool"
 
-# Maximum unique component source names (8-bit index, 0 = not set)
-_MAX_COMPONENT_SOURCES = 0xFF  # 255
+# Maximum unique component source names (9-bit index, 0 = not set)
+_MAX_COMPONENT_SOURCES = 0x1FF  # 511
 
 
 @dataclass
@@ -110,7 +110,7 @@ def _generate_source_table_code(
 
     entries = ", ".join(var_names)
     lines.append(f"static const char *const {table_var}[] PROGMEM = {{{entries}}};")
-    lines.append(f"const LogString *{lookup_fn}(uint8_t index) {{")
+    lines.append(f"const LogString *{lookup_fn}(uint16_t index) {{")
     lines.append(f'  if (index == 0 || index > {count}) return LOG_STR("<unknown>");')
     lines.append("  return reinterpret_cast<const LogString *>(")
     lines.append(f"    progmem_read_ptr(&{table_var}[index - 1]));")
diff --git a/tests/unit_tests/test_cpp_helpers.py b/tests/unit_tests/test_cpp_helpers.py
index 52424a7cb2..63cb5be6d0 100644
--- a/tests/unit_tests/test_cpp_helpers.py
+++ b/tests/unit_tests/test_cpp_helpers.py
@@ -137,7 +137,7 @@ def test_register_component_source_overflow_warns(
 ) -> None:
     # Pre-fill pool to max
     pool = ComponentSourcePool(
-        sources={f"comp_{i}": i + 1 for i in range(0xFF)},
+        sources={f"comp_{i}": i + 1 for i in range(0x1FF)},
         table_registered=True,
     )
     monkeypatch.setattr(ch, "CORE", Mock(data={ch._COMPONENT_SOURCE_DOMAIN: pool}))