FSM7J Tactile Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The FSM7J is a tactile switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a SPST-NO (Single Pole Single Throw Normally Open) momentary contact switch rated for 0.05A at 24VDC. This through-hole mounted component features a top-actuated standard actuator with a 6.00mm x 6.00mm footprint and includes a grounding pin. The FSM7J is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and component procurement.

Substiute Parts

FSM7J

TE Connectivity ALCOSWITCH SwitchesIn Stock: 658FSM7J Datasheet

Current PartRFQ

1-1825955-4

TE Connectivity ALCOSWITCH SwitchesIn Stock: 238861-1825955-4 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete FSM7J is based on electrical and mechanical parameter equivalence within the FSMJ series. The substitute part 1-1825955-4 maintains compatibility through identical circuit configuration (SPST-NO), contact rating (0.05A @ 24VDC), switch function (Off-Mom), mounting type (Through Hole), actuator orientation (Top Actuated), outline dimensions (6.00mm x 6.00mm), operating force (160gf), termination style (PC Pin), and mechanical life rating (100,000 Cycles).

The substitute part is functionally interchangeable based on the following critical parameters:

• Electrical: SPST-NO circuit, 0.05A @ 24VDC contact rating
• Mechanical: Through-hole mounting, 6.00mm x 6.00mm footprint, 9.50mm actuator height, 160gf operating force
• Functional: Momentary contact operation with grounding pin
• Reliability: 100,000 cycle mechanical life rating

Variations in operating temperature range, actuator material composition, and switch travel distance do not affect functional substitution for applications within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

The substitute part 1-1825955-4 is the direct replacement for the obsolete FSM7J. This substitution is supported by:

Product Status: The substitute part maintains active product status with TE Connectivity ALCOSWITCH Switches, ensuring ongoing availability and manufacturing support compared to the obsolete FSM7J.

Regulatory Compliance: Both parts maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99), confirming equivalent regulatory standing. The substitute part carries RoHS3 compliance certification, providing enhanced environmental compliance documentation.

Electrical Equivalence: Identical circuit configuration (SPST-NO), contact rating (0.05A @ 24VDC), and switch function (Off-Mom) ensure direct electrical interchangeability in all applications designed for the FSM7J.

Mechanical Compatibility: Matching through-hole mounting, 6.00mm x 6.00mm footprint, 9.50mm actuator height, PC pin termination, and 160gf operating force provide complete mechanical interchangeability without PCB redesign.

Reliability: Both parts specify 100,000 cycle mechanical life and MSL 1 (Unlimited) moisture sensitivity rating, confirming equivalent long-term reliability performance.

The substitute part 1-1825955-4 operates across an extended temperature range (-35°C ~ 85°C versus -20°C ~ 70°C) and incorporates PBT actuator material with reduced switch travel (0.10mm versus 0.25mm), representing design improvements in the active product line.

Frequently Asked Questions (FAQ)

Q: Can the 1-1825955-4 be used as a direct replacement for the FSM7J without PCB modifications?

A: Yes. The substitute part maintains identical through-hole mounting configuration, 6.00mm x 6.00mm footprint, 9.50mm actuator height, and PC pin termination. No PCB layout changes are required for mechanical or electrical integration.

Q: Are the electrical specifications identical between FSM7J and 1-1825955-4?

A: Yes. Both parts are configured as SPST-NO switches with 0.05A @ 24VDC contact rating and Off-Mom (momentary) switch function. Electrical performance is equivalent for all applications within these specifications.

Q: What is the difference in switch travel between these parts?

A: The FSM7J specifies 0.25mm switch travel, while the 1-1825955-4 specifies 0.10mm switch travel. This difference does not affect functional substitution for standard momentary contact applications. Both parts maintain identical 160gf operating force and 100,000 cycle mechanical life.

Q: Does the actuator material change affect compatibility?

A: The FSM7J uses Acetal actuator material, while the 1-1825955-4 uses Polybutylene Terephthalate (PBT). Both materials are suitable for the specified operating temperature ranges and do not affect electrical or mechanical interchangeability. The substitute part operates across an extended temperature range (-35°C ~ 85°C versus -20°C ~ 70°C).

Q: What packaging options are available for the substitute part?

A: The 1-1825955-4 is supplied in Bulk packaging. The FSM7J packaging specification was not provided in the original documentation.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both parts maintain REACH Unaffected status and EAR99 ECCN classification. The substitute part 1-1825955-4 carries additional RoHS3 compliance certification, confirming compliance with current environmental regulations.

Q: What is the inventory status for each part?

A: The FSM7J (obsolete) has 634 pieces in stock. The 1-1825955-4 (active) has 23,823 pieces in stock, providing significantly greater availability for ongoing procurement.