There are a few APEM tactile switch parts with an added “L” suffix that isn’t listed on the datasheet.
Per the manufacturer -
The L indicated Long life. The L options are built with a stainless steel dome that will reach up to 1 million cycles where the standard part is made from a Phosphor bronze that will get you about 100K cycles or so depending on the model.
| Apem Part # | Mechanical Life Cycles | Packaging |
| MJTP1138 | 100,000 | Bulk |
| MJTP1138TR | 100,000 | Tape and Reel |
| MJTP1138LTR | 1,000,000 | Tape and Reel |
Summary
| DK Part # | Mfr Part # |
|---|---|
| 679-2412-2-ND | MJTP1138ALTR |
| 679-2410-2-ND | MJTP1138LTR |
| 679-2323-2-ND | MJTP1138CLTR |
| MJTP1230BL-ND | MJTP1230BL |
| MJTP1232AL-ND | MJTP1232AL |
| 679-2414-2-ND | MJTP1138BLTR |
| MJTP1138CLBULK-ND | MJTP1138CLBULK |
| MJTP1138BLTUBE-ND | MJTP1138BLTUBE |
| 679-MJTP1122LTR-ND | MJTP1122LTR |