diff --git a/pandas/core/arrays/timedeltas.py b/pandas/core/arrays/timedeltas.py
index 6ca57e7872910..c97c7da375fd4 100644
--- a/pandas/core/arrays/timedeltas.py
+++ b/pandas/core/arrays/timedeltas.py
@@ -214,6 +214,19 @@ def _simple_new(
 
     @classmethod
     def _from_sequence(
+        cls, data, dtype=TD64NS_DTYPE, copy: bool = False
+    ) -> "TimedeltaArray":
+        if dtype:
+            _validate_td64_dtype(dtype)
+
+        data, inferred_freq = sequence_to_td64ns(data, copy=copy, unit=None)
+        freq, _ = dtl.validate_inferred_freq(None, inferred_freq, False)
+
+        result = cls._simple_new(data, freq=freq)
+        return result
+
+    @classmethod
+    def _from_sequence_not_strict(
         cls,
         data,
         dtype=TD64NS_DTYPE,
diff --git a/pandas/core/indexes/timedeltas.py b/pandas/core/indexes/timedeltas.py
index 854c4e33eca01..858387f2e1600 100644
--- a/pandas/core/indexes/timedeltas.py
+++ b/pandas/core/indexes/timedeltas.py
@@ -153,7 +153,7 @@ def __new__(
 
         # - Cases checked above all return/raise before reaching here - #
 
-        tdarr = TimedeltaArray._from_sequence(
+        tdarr = TimedeltaArray._from_sequence_not_strict(
             data, freq=freq, unit=unit, dtype=dtype, copy=copy
         )
         return cls._simple_new(tdarr, name=name)