BUG: Added test and release note pandas-dev#45319

Author: KingOfTheShow69

doc/source/whatsnew/v1.5.0.rst

@@ -827,7 +827,7 @@ Datetimelike
 - Bug in :meth:`DatetimeIndex.resolution` incorrectly returning "day" instead of "nanosecond" for nanosecond-resolution indexes (:issue:`46903`)
 - Bug in :class:`Timestamp` with an integer or float value and ``unit="Y"`` or ``unit="M"`` giving slightly-wrong results (:issue:`47266`)
 - Bug in :class:`.DatetimeArray` construction when passed another :class:`.DatetimeArray` and ``freq=None`` incorrectly inferring the freq from the given array (:issue:`47296`)
--
+- Bug in :func:`to_datetime` where ``OutOfBoundsDatetime`` would be thrown even if ``errors=coerce`` if there were more than 50 rows (:issue:`45319`)
 
 Timedelta
 ^^^^^^^^^

pandas/tests/tools/test_to_datetime.py

@@ -2773,3 +2773,23 @@ def test_to_datetime_monotonic_increasing_index(cache):
     result = to_datetime(times.iloc[:, 0], cache=cache)
     expected = times.iloc[:, 0]
     tm.assert_series_equal(result, expected)
+
+
+@pytest.mark.parametrize(
+    "input",
+    [
+        Series(
+            [datetime.fromisoformat("1446-04-12 00:00:00+00:00")]
+            + ([datetime.fromisoformat("1991-10-20 00:00:00+00:00")] * 40)
+        ),
+        Series(
+            [datetime.fromisoformat("1446-04-12 00:00:00+00:00")]
+            + ([datetime.fromisoformat("1991-10-20 00:00:00+00:00")] * 50)
+        ),
+    ],
+)
+def test_to_datetime_cache_coerce_50_lines(input):
+    # GH#45319
+    result = to_datetime(input, errors="coerce", utc=True)
+
+    assert result[0] is NaT