diff --git a/bom_replace_alphax_8ch-c.csv b/bom_replace_alphax_8ch-c.csv
index 5c971ad..69b7caa 100644
--- a/bom_replace_alphax_8ch-c.csv
+++ b/bom_replace_alphax_8ch-c.csv
@@ -26,6 +26,9 @@ F410,"nSMD050-24V","SMD1206","C70076"
 # TLS115
 U411,"TLS115B0EJXUMA1","PG-DSO-8","C3743696"
 
+# clock crystal
+Y101,"SC-20S,32.768kHz,20PPM,7pF","2012","C97602"
+
 # MUX
 "U293,U291,U289,U287,U270,U275,U280,U285,U755,U756,U755_2,U756_2,U755_3,U756_3","WAS3157B-6","SOT-363","C213161"