PTS125SJM73 Equivalent & Substitute Parts

Part Overview

The PTS125SJM73 is a tactile switch manufactured by C&K, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.05A at 12VDC. This through-hole mounted component features a plunger actuator with top actuation, 7.30mm height, and 12.00mm x 12.00mm outline dimensions. The product is currently obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility (SPST-NO circuit, 0.05A contact rating) and mechanical compatibility (through-hole mounting, similar actuator height and outline).

Substiute Parts

PTS125SJM73

C&KIn Stock: 845PTS125SJM73 Datasheet

Current PartRFQ

PTS125SJM73-2LFS

C&KIn Stock: 861PTS125SJM73-2LFS Datasheet

DirectRFQ

JB15LPC-BB

NKK SwitchesIn Stock: 1151JB15LPC-BB Datasheet

SimilarRFQ

JB15LPC-BC

NKK SwitchesIn Stock: 798JB15LPC-BC Datasheet

SimilarRFQ

MJTP1212A

APEM Inc.In Stock: 5364MJTP1212A Datasheet

SimilarRFQ

MJTP1212C

APEM Inc.In Stock: 26235MJTP1212C Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic is based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Compatibility Requirements:

• Circuit configuration must be SPST-NO
• Contact rating must support 0.05A minimum at operating voltage
• Switch function must be Off-Mom (momentary)

Mechanical Compatibility Requirements:

• Mounting type must be through-hole
• Actuator orientation must be top actuated
• Termination style must be PC pin
• Outline dimensions must be 12.00mm x 12.00mm or 10.00mm x 10.00mm (within PCB footprint tolerance)
• Actuator height must be within acceptable range (7.30mm nominal, with tolerance for 11.20mm variants in specific applications)
• Operating force must be 160gf or 176gf (within tactile feedback specification)

Compliance Requirements:

• RoHS3 compliance preferred for active products
• MSL rating must be 1 (Unlimited)

Substitute parts are grouped into two categories:

Direct Substitutes (Same Voltage Rating):

• PTS125SJM73-2LFS (C&K): Active product, identical electrical and mechanical specifications, tube packaging

Similar Substitutes (Compatible but Different Voltage Rating or Features):

• JB15LPC-BB and JB15LPC-BC (NKK Switches): 24VDC rated, illuminated variants, higher mechanical life (5,000,000 cycles), IP67 ingress protection, larger actuator height (11.20mm)
• MJTP1212A and MJTP1212C (APEM Inc.): 12VDC rated, non-illuminated, lower mechanical life (100,000 cycles), slightly taller actuator height (7.50mm for MJTP1212A, 7.30mm for MJTP1212C)

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: PTS125SJM73-2LFS

The PTS125SJM73-2LFS is the direct substitute for the obsolete PTS125SJM73. This C&K component maintains identical electrical specifications (0.05A @ 12VDC, SPST-NO), mechanical configuration (plunger actuator, 7.30mm height, 12.00mm x 12.00mm outline), and operating force (160gf). The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Packaging differs (tube versus original strip), but electrical and mechanical compatibility is complete. This substitute requires no design modification.

Secondary Recommendations: MJTP1212A and MJTP1212C

APEM Inc. MJTP series parts maintain 12VDC electrical compatibility and identical outline dimensions (12.00mm x 12.00mm). MJTP1212C matches the plunger actuator type and 7.30mm height of the original part. MJTP1212A features a standard actuator with 7.50mm height. Both parts are active, ROHS3 compliant, and feature tactile feedback. Mechanical life is lower (100,000 cycles versus 200,000 cycles), and operating temperature range is narrower (-20°C ~ 70°C versus -40°C ~ 60°C). These substitutes are suitable for applications where the reduced mechanical life and temperature range are acceptable.

Alternative Consideration: JB15LPC-BB and JB15LPC-BC

NKK Switches JB series parts offer significantly enhanced mechanical life (5,000,000 cycles) and IP67 ingress protection. However, these parts operate at 24VDC (not 12VDC), feature illuminated LED indicators (red, 1.8VDC), and have larger actuator height (11.20mm). Outline dimensions are smaller (10.00mm x 10.00mm). These substitutes are suitable only for applications where the circuit voltage can be adjusted to 24VDC, illumination is desired or acceptable, and the larger actuator height does not conflict with enclosure design. PCB footprint modification may be required due to different outline dimensions.

Frequently Asked Questions (FAQ)

Q: Can PTS125SJM73-2LFS be used as a direct replacement for PTS125SJM73?

A: Yes. PTS125SJM73-2LFS is electrically and mechanically identical to PTS125SJM73. Both parts feature SPST-NO circuit configuration, 0.05A @ 12VDC contact rating, plunger actuator, 7.30mm height, 12.00mm x 12.00mm outline, and 160gf operating force. The only difference is packaging (tube versus original). No design modification is required.

Q: What is the key difference between MJTP1212A and MJTP1212C?

A: Both parts are APEM Inc. MJTP series switches with identical electrical specifications (0.05A @ 12VDC) and outline dimensions (12.00mm x 12.00mm). The primary difference is actuator type: MJTP1212A features a standard actuator with 7.50mm height, while MJTP1212C features a plunger actuator with 7.30mm height (matching the original PTS125SJM73). MJTP1212C is the closer mechanical match.

Q: Why do JB15LPC-BB and JB15LPC-BC have different voltage ratings?

A: JB15LPC-BB and JB15LPC-BC are rated for 24VDC operation, not 12VDC. These parts are not direct substitutes for the 12VDC PTS125SJM73 unless the circuit design is modified to support 24VDC. Additionally, these parts include LED illumination (red, 1.8VDC) and IP67 ingress protection, which are not present in the original part.

Q: Can I use MJTP1212A or MJTP1212C in applications requiring -40°C operation?

A: No. MJTP1212A and MJTP1212C are rated for -20°C ~ 70°C operating temperature, which does not include the -40°C lower limit of the original PTS125SJM73 (-40°C ~ 60°C). For applications requiring -40°C operation, PTS125SJM73-2LFS is the only suitable substitute from this list.

Q: What is the mechanical life difference between substitute parts?

A: PTS125SJM73 and PTS125SJM73-2LFS are rated for 200,000 cycles. MJTP1212A and MJTP1212C are rated for 100,000 cycles (50% lower). JB15LPC-BB and JB15LPC-BC are rated for 5,000,000 cycles (25 times higher). Application duty cycle requirements determine which mechanical life rating is acceptable.

Q: Do all substitute parts have the same outline dimensions?

A: No. PTS125SJM73-2LFS, MJTP1212A, and MJTP1212C maintain the original 12.00mm x 12.00mm outline. JB15LPC-BB and JB15LPC-BC have smaller outline dimensions (10.00mm x 10.00mm), which may require PCB footprint modification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (PTS125SJM73-2LFS, MJTP1212A, MJTP1212C, JB15LPC-BB, JB15LPC-BC) are ROHS3 compliant. The original PTS125SJM73 is RoHS compliant (earlier standard). All parts have MSL rating of 1 (Unlimited).