MJTP1122B Tactile Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The MJTP1122B is an active-status tactile switch manufactured by APEM Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) device with off-momentary switch function. This surface mount component is rated for 0.05A at 12VDC with top actuated operation and gull wing termination. Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within alternative electrical and mechanical specifications.

Substiute Parts

MJTP1122B

APEM Inc.In Stock: 881MJTP1122B Datasheet

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EDGSC1LFG

C&KIn Stock: 2030EDGSC1LFG Datasheet

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EDM 450 S AC LFS

C&KIn Stock: 1392EDM 450 S AC LFS Datasheet

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KSC441G ST1 LFS

C&KIn Stock: 8616KSC441G ST1 LFS Datasheet

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PTS645SM43SMTR92 LFS

C&KIn Stock: 462682PTS645SM43SMTR92 LFS Datasheet

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TL3303F160QG

E-SwitchIn Stock: 1826TL3303F160QG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SPST-NO
• Switch function must be Off-Mom
• Contact rating must support 0.05A minimum at operating voltage
• Mounting type must be Surface Mount (for direct PCB replacement)
• Actuator orientation must be Top Actuated
• Termination style must be Gull Wing (for direct footprint compatibility)
• Outline dimensions must be compatible with existing PCB layout
• RoHS3 compliance required

Secondary Compatibility Parameters:

• Operating temperature range must encompass or exceed the application requirement
• Mechanical life rating must meet or exceed 100,000 cycles
• MSL rating must be 1 (Unlimited) for standard handling

The substitute parts listed below meet all primary compatibility criteria and maintain electrical equivalence at the specified contact rating. Variations in actuator height, operating force, and switch travel are permitted when the application design accommodates these mechanical differences.

Parameter Comparison

Engineering Selection Recommendations

Direct Footprint Equivalents (Gull Wing Termination, Surface Mount):

TL3303F160QG (E-Switch) and PTS645SM43SMTR92 LFS (C&K) are the closest electrical and mechanical equivalents to MJTP1122B. Both maintain identical contact rating (0.05A @ 12VDC), operating force (160gf), switch travel (0.25mm), and mechanical life (100,000 cycles). TL3303F160QG matches the actuator height precisely at 3.10mm. PTS645SM43SMTR92 LFS operates across an extended upper temperature limit (-20°C ~ 85°C) compared to the MJTP1122B (-20°C ~ 70°C). Both parts are ROHS3 compliant with MSL rating 1.

Alternative Surface Mount Options (Modified Mechanical Characteristics):

KSC441G ST1 LFS (C&K) operates at higher contact voltage (32VDC) and provides extended mechanical life (300,000 cycles). The actuator height is elevated to 5.20mm and operating force increases to 340gf. This part is suitable when PCB clearance permits and higher actuation force is acceptable. Operating temperature range extends to -40°C ~ 85°C.

EDGSC1LFG (C&K) features the highest contact voltage rating (100VAC/DC) and exceptional mechanical life (1,000,000 cycles). The actuator height is significantly reduced to 1.20mm with increased operating force (240gf). Termination style differs (SMD Tab instead of Gull Wing), requiring PCB footprint modification. IP67 ingress protection is provided.

Through-Hole Alternative:

EDM 450 S AC LFS (C&K) is a through-hole mounted variant with 100VAC/DC contact rating and 1,000,000 cycle mechanical life. This part is not suitable for direct replacement on PCB layouts designed for surface mount components.

All listed substitutes maintain ROHS3 compliance and MSL rating 1 (Unlimited), ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can TL3303F160QG replace MJTP1122B directly on the PCB?

A: Yes. TL3303F160QG maintains identical contact rating (0.05A @ 12VDC), actuator height (3.10mm), operating force (160gf), switch travel (0.25mm), and gull wing termination. The outline dimensions are 6.20mm x 6.00mm versus 6.20mm x 6.20mm for MJTP1122B, representing a negligible difference compatible with standard PCB tolerances.

Q: What is the primary difference between PTS645SM43SMTR92 LFS and MJTP1122B?

A: Both parts are electrically equivalent at 0.05A @ 12VDC with identical operating force (160gf) and mechanical life (100,000 cycles). PTS645SM43SMTR92 LFS extends the upper operating temperature limit to 85°C (versus 70°C for MJTP1122B) and features a blue actuator. The outline is 6.00mm x 6.00mm, slightly smaller than MJTP1122B.

Q: Why does KSC441G ST1 LFS have a higher operating force (340gf)?

A: Operating force is a mechanical characteristic determined by actuator design and snap dome configuration. KSC441G ST1 LFS is engineered for applications requiring higher tactile feedback and actuation resistance. This parameter is provided in the datasheet and must be evaluated against application requirements.

Q: Can EDGSC1LFG be used as a direct replacement?

A: EDGSC1LFG is electrically compatible (0.05A contact rating) but requires PCB footprint modification. The termination style is SMD Tab instead of Gull Wing, and the actuator height is significantly reduced to 1.20mm. This part is suitable only when the PCB layout can be redesigned to accommodate the different footprint.

Q: What does MSL rating 1 (Unlimited) mean?

A: MSL (Moisture Sensitivity Level) rating 1 indicates the component has unlimited shelf life under standard storage conditions (typically 30°C / 60% relative humidity). No special moisture control or baking procedures are required before soldering.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting the same environmental and hazardous substance restrictions as MJTP1122B.

Q: Which substitute offers the longest mechanical life?

A: EDGSC1LFG and EDM 450 S AC LFS both provide 1,000,000 cycle mechanical life, compared to 100,000 cycles for MJTP1122B. These parts are suitable for high-cycle applications where extended component longevity is required.