LS8J4M-T Equivalent & Substitute Parts

Part Overview

The LS8J4M-T is a tactile switch manufactured by Citizen, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.02A at 12VDC. This component features top-actuated surface mount construction with an oval button actuator and 2.50mm height off PCB. The LS8J4M-T is currently listed as obsolete, making identification of equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

LS8J4M-T

CitizenIn Stock: 784LS8J4M-T Datasheet

Current PartRFQ

EVQ-P2602W

Panasonic Electronic ComponentsIn Stock: 129025EVQ-P2602W Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LS8J4M-T is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Circuit configuration must be SPST-NO
• Switch function must be Off-Mom (momentary operation)
• Contact rating current must be 0.02A
• Mounting type must be Surface Mount
• Actuator orientation must be Top Actuated
• Actuator height off PCB must be 2.50mm
• Operating force must be 350gf
• Termination must be compatible with SMD assembly

Allowable Variations:

• Contact voltage rating may exceed 12VDC (higher voltage rating is acceptable)
• Actuator button shape may differ (oval to rectangular)
• Switch travel may vary within mechanical tolerance
• Mechanical life may exceed 100,000 cycles
• Outline dimensions may vary within PCB footprint compatibility
• Termination style may differ if electrically and mechanically compatible

The EVQ-P2602W from Panasonic Electronic Components meets these substitution criteria with the following alignment: identical circuit configuration (SPST-NO), identical switch function (Off-Mom), identical contact current rating (0.02A), identical mounting type (Surface Mount), identical actuator orientation (Top Actuated), and identical actuator height (2.50mm).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: EVQ-P2602W (Panasonic Electronic Components)

The EVQ-P2602W is the qualified substitute for the obsolete LS8J4M-T based on the following engineering factors:

Electrical Compatibility: The EVQ-P2602W maintains identical circuit configuration (SPST-NO), switch function (Off-Mom momentary operation), and contact current rating (0.02A). The contact voltage rating of 15VDC exceeds the original 12VDC specification, providing additional design margin without compromising functionality in 12VDC applications.

Mechanical Compatibility: Both switches share identical actuator height (2.50mm), top-actuated orientation, and operating force (350gf). The outline dimensions vary slightly (4.70mm x 3.50mm versus 4.90mm x 3.20mm), requiring PCB footprint verification. The switch travel difference (0.25mm versus 0.20mm) falls within acceptable mechanical tolerance for tactile switch applications.

Regulatory and Compliance Status: The EVQ-P2602W holds ROHS3 compliance, meeting current regulatory requirements. Both components maintain MSL 1 (Unlimited) moisture sensitivity and REACH Unaffected status. The substitute is currently in active production status, ensuring long-term availability and supply chain continuity.

Termination Consideration: The EVQ-P2602W uses J Lead termination versus the original SMD Tab termination. Both are surface mount compatible; however, PCB assembly process parameters and solder reflow profiles may require adjustment to accommodate the different lead geometry.

Mechanical Life Enhancement: The EVQ-P2602W provides 200,000 mechanical cycles compared to the original 100,000 cycles, offering improved durability for high-cycle applications.

Frequently Asked Questions (FAQ)

Q: Can the EVQ-P2602W directly replace the LS8J4M-T without PCB modifications?

A: The EVQ-P2602W is electrically compatible and functionally equivalent. However, the outline dimensions differ slightly (4.70mm x 3.50mm versus 4.90mm x 3.20mm), and the termination style changes from SMD Tab to J Lead. PCB footprint verification is required before implementation. If the original footprint accommodates the substitute dimensions, no PCB modification is necessary. If footprint adjustment is needed, PCB redesign is required.

Q: What is the voltage rating difference between the two switches?

A: The LS8J4M-T is rated for 12VDC, while the EVQ-P2602W is rated for 15VDC. In applications operating at 12VDC, the higher voltage rating of the substitute provides additional design margin and does not create compatibility issues. The substitute is suitable for 12VDC circuits.

Q: Are there differences in actuator feel or tactile response?

A: Both switches share identical operating force (350gf) and actuator height (2.50mm). The LS8J4M-T features an oval button actuator, while the EVQ-P2602W uses a rectangular button. The actuator shape difference does not affect electrical function or tactile response characteristics; however, user interface feel may differ slightly due to button geometry.

Q: What is the impact of the different switch travel specifications?

A: The LS8J4M-T has 0.20mm switch travel, while the EVQ-P2602W has 0.25mm travel. This 0.05mm difference is within normal mechanical tolerance for tactile switches and does not affect electrical performance or circuit operation in standard applications.

Q: Is the EVQ-P2602W suitable for high-cycle applications?

A: Yes. The EVQ-P2602W is rated for 200,000 mechanical cycles compared to the original 100,000 cycles. This makes the substitute suitable for applications requiring extended mechanical life and higher cycle counts.

Q: What packaging format is available for the EVQ-P2602W?

A: The EVQ-P2602W is supplied in Tape & Reel (TR) packaging format, standard for surface mount component distribution. The original LS8J4M-T packaging format is not specified in the available data.

Q: Are there any assembly process considerations when switching to the EVQ-P2602W?

A: The termination style change from SMD Tab to J Lead may require adjustment of solder reflow profiles and assembly parameters. The J Lead termination is standard for surface mount assembly; however, lead geometry differences should be evaluated with your assembly partner to ensure optimal solder joint quality and reliability.

Q: What is the current availability status of both components?

A: The LS8J4M-T is obsolete and no longer manufactured. The EVQ-P2602W is in active production status with substantial inventory availability (128,935 pieces reported in stock), ensuring reliable long-term supply for new designs and production requirements.