Table schema:
CREATE TABLE table_name_66 (body_width_mm INTEGER, part_number VARCHAR, body_length_mm VARCHAR)

Question: How much Body Width/mm has a Part Number of tsop40/44, and a Body Length/mm smaller than 18.42?
SQL: SELECT SUM(body_width_mm) FROM table_name_66 WHERE part_number = "tsop40/44" AND body_length_mm < 18.42