XA series header part numbering. Letters "N" & "A"


#1

What is the difference in the XA series header part numbers with and without the “N”?

This question is not specifically addressed in the data sheet, however JST offers the following answer.

The parts without the “N” incorporated in the part number may emit an unpleasant odor. In response to customer requests, the parts with the “N” use a raw material resin grade for the wafer material that incorporates countermeasures against the odor.
Without “N” part numbers in which an unpleasant odor may be present:
B( )B-XASK-1 (LF)(SN)
B( )B-XASK-1-A (LF)(SN)
With “N” part numbers that incorporate countermeasure against an odor:
B( )B-XASK-1N (LF)(SN)
B( )B-XASK-1N-A (LF)(SN)
Replace ( ) with the applicable number of circuits for the series.

Here are a couple other questions that come up on this series part numbering
(LF)(SN) is the RoHS compliant identifier.

Without “A” is without a locating / polarizing boss.
With “A” is with a locating / polarizing boss.

Applicable Part Numbers

455-2023-2-ND 455-2023-1-ND 455-2023-6-ND 455-2025-2-ND 455-2025-1-ND 455-2025-6-ND 455-1989-ND 455-1994-ND 455-1995-ND 455-1996-ND 455-2044-ND 455-2941-ND 455-1998-ND 455-1999-ND 455-2942-ND 455-2005-ND 455-2022-2-ND 455-2022-1-ND 455-2022-6-ND 455-3276-ND 455-2024-2-ND 455-2024-1-ND 455-2024-6-ND 455-2027-2-ND 455-2027-1-ND 455-2027-6-ND 455-2028-2-ND 455-2028-1-ND 455-2028-6-ND 455-1990-ND 455-2026-2-ND 455-2026-1-ND 455-2026-6-ND B05B-XASK-1-A(LF)(SN)-ND S03B-XASK-1(LF)(SN)-ND B06B-XASK-1-A(LF)(SN)-ND B07B-XASK-1-A(LF)(SN)-ND S04B-XASK-1(LF)(SN)-ND S06B-XASK-1(LF)(SN)-ND S08B-XASK-1(LF)(SN)-ND B13B-XASK-1(LF)(SN)-ND B14B-XASK-1-A(LF)(SN)-ND BM04B-XASS-TF(LF)(SN)-ND B15B-XASK-1(LF)(SN)-ND B15B-XASK-1-A(LF)(SN)-ND B20B-XASK-1(LF)(SN)-ND S12B-XASK-1(LF)(SN)-ND 455-2029-2-ND B02B-XASK-1-ND B03B-XASK-1-ND B04B-XASK-1-ND B05B-XASK-1-ND B06B-XASK-1-ND B08B-XASK-1-ND B09B-XASK-1-ND B10B-XASK-1-ND B11B-XASK-1-ND B12B-XASK-1-ND B14B-XASK-1-ND S02B-XASS-1-ND BM02B-XASS-TF-ND BM03B-XASS-TF-ND BM05B-XASS-TF-ND BM06B-XASS-TF-ND BM07B-XASS-TF-ND BM08B-XASS-TF-ND BM09B-XASS-TF-ND BM12B-XASS-TF-ND BM13B-XASS-TF-ND BM15B-XASS-TF-ND
BM03B-XASS-TF(LF)(SN) BM03B-XASS-TF(LF)(SN) BM03B-XASS-TF(LF)(SN) BM06B-XASS-TF(LF)(SN) BM06B-XASS-TF(LF)(SN) BM06B-XASS-TF(LF)(SN) B02B-XASK-1(LF)(SN) B04B-XASK-1(LF)(SN) B05B-XASK-1(LF)(SN) B06B-XASK-1(LF)(SN) S02B-XASS-1(LF)(SN) B07B-XASK-1(LF)(SN) B08B-XASK-1(LF)(SN) B09B-XASK-1(LF)(SN) B10B-XASK-1-A(LF)(SN) B12B-XASK-1(LF)(SN) BM02B-XASS-TF(LF)(SN) BM02B-XASS-TF(LF)(SN) BM02B-XASS-TF(LF)(SN) B10B-XASK-1(LF)(SN) BM05B-XASS-TF(LF)(SN) BM05B-XASS-TF(LF)(SN) BM05B-XASS-TF(LF)(SN) BM08B-XASS-TF(LF)(SN) BM08B-XASS-TF(LF)(SN) BM08B-XASS-TF(LF)(SN) BM09B-XASS-TF(LF)(SN) BM09B-XASS-TF(LF)(SN) BM09B-XASS-TF(LF)(SN) B03B-XASK-1(LF)(SN) BM07B-XASS-TF(LF)(SN) BM07B-XASS-TF(LF)(SN) BM07B-XASS-TF(LF)(SN) B05B-XASK-1-A(LF)(SN) S03B-XASK-1(LF)(SN) B06B-XASK-1-A(LF)(SN) B07B-XASK-1-A(LF)(SN) S04B-XASK-1(LF)(SN) S06B-XASK-1(LF)(SN) S08B-XASK-1(LF)(SN) B13B-XASK-1(LF)(SN) B14B-XASK-1-A(LF)(SN) BM04B-XASS-TF(LF)(SN) B15B-XASK-1(LF)(SN) B15B-XASK-1-A(LF)(SN) B20B-XASK-1(LF)(SN) S12B-XASK-1(LF)(SN) BM13B-XASS-TF(LF)(SN) B02B-XASK-1 B03B-XASK-1 B04B-XASK-1 B05B-XASK-1 B06B-XASK-1 B08B-XASK-1 B09B-XASK-1 B10B-XASK-1 B11B-XASK-1 B12B-XASK-1 B14B-XASK-1 S02B-XASS-1 BM02B-XASS-TF BM03B-XASS-TF BM05B-XASS-TF BM06B-XASS-TF BM07B-XASS-TF BM08B-XASS-TF BM09B-XASS-TF BM12B-XASS-TF BM13B-XASS-TF BM15B-XASS-TF