FSM3J Equivalent & Substitute Parts

Part Overview

The FSM3J is a tactile switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a SPST-NO (Single Pole Single Throw Normally Open) device with off-momentary switch function. This component is rated for 0.05A at 24VDC and features top actuation through-hole mounting with a 6.00mm x 6.00mm outline. The FSM3J is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support, maintenance, and production continuity. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in existing circuit designs.

Substiute Parts

FSM3J

TE Connectivity ALCOSWITCH SwitchesIn Stock: 1132FSM3J Datasheet

Current PartRFQ

1825910-6

TE Connectivity ALCOSWITCH SwitchesIn Stock: 22601825910-6 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSM3J is determined by strict equivalence across the following critical parameters: circuit configuration (SPST-NO), switch function (Off-Mom), contact rating (0.05A @ 24VDC), mounting type (Through Hole), actuator orientation (Top Actuated), outline dimensions (6.00mm x 6.00mm), actuator height (5.00mm), operating force (160gf), switch travel (0.25mm), mechanical life (100,000 Cycles), termination style (PC Pin), and non-illuminated status.

The substitute part 1825910-6 meets all these critical parameters. While the substitute exhibits differences in product status (Active versus Obsolete), operating temperature range, actuator material composition, and compliance certifications, these variations do not affect functional or mechanical compatibility in the target application. The substitute part maintains identical electrical performance and physical form factor, enabling direct replacement in through-hole PCB assemblies.

Parameter Comparison

Engineering Selection Recommendations

The 1825910-6 is the direct functional equivalent for the obsolete FSM3J. Selection of this substitute is supported by the following engineering factors:

Product Status: The FSM3J is obsolete, whereas 1825910-6 is active and currently manufactured. Active product status ensures ongoing availability, supply chain reliability, and access to current manufacturing documentation.

Electrical Equivalence: Both parts maintain identical contact ratings (0.05A @ 24VDC), circuit configuration (SPST-NO), and switch function (Off-Mom), ensuring electrical performance parity in the target application.

Mechanical Equivalence: Identical outline dimensions (6.00mm x 6.00mm), actuator height (5.00mm), operating force (160gf), switch travel (0.25mm), and mechanical life (100,000 Cycles) confirm direct PCB footprint compatibility and tactile performance equivalence.

Compliance Enhancement: The substitute part carries ROHS3 compliance certification, providing regulatory advantage for new designs and manufacturing environments subject to RoHS directives.

Operating Temperature: The substitute exhibits an extended operating temperature range (-35°C ~ 85°C versus -20°C ~ 70°C), providing thermal margin for applications operating at temperature extremes.

Frequently Asked Questions (FAQ)

Q: Can 1825910-6 be used as a direct replacement for FSM3J in existing designs?

A: Yes. The 1825910-6 maintains identical electrical ratings (0.05A @ 24VDC, SPST-NO), mechanical dimensions (6.00mm x 6.00mm outline, 5.00mm actuator height), and functional characteristics (Off-Mom, 160gf operating force, 0.25mm travel). Direct PCB footprint compatibility and electrical performance equivalence are confirmed.

Q: What is the primary reason for substitution?

A: The FSM3J is classified as obsolete. The 1825910-6 is an active product from the same manufacturer (TE Connectivity ALCOSWITCH Switches) with identical functional specifications, ensuring continued component availability and supply chain continuity.

Q: Are there differences in actuator material between these parts?

A: Yes. The FSM3J uses polyester actuator material, while 1825910-6 uses polybutylene terephthalate (PBT). Both materials are suitable for tactile switch applications and do not affect electrical or mechanical compatibility. PBT offers enhanced thermal and chemical resistance characteristics.

Q: Does the substitute part have different packaging?

A: The FSM3J is supplied in standard packaging, while 1825910-6 is supplied in bulk packaging. Packaging format does not affect component functionality or performance.

Q: What is the operating temperature difference?

A: The FSM3J operates from -20°C to 70°C, while 1825910-6 operates from -35°C to 85°C. The substitute provides a wider thermal operating window, suitable for applications requiring extended temperature performance.

Q: Is the substitute part RoHS compliant?

A: Yes. The 1825910-6 is ROHS3 compliant. Both parts maintain REACH Unaffected status.

Q: Are the mechanical life specifications identical?

A: Yes. Both parts are rated for 100,000 mechanical cycles, ensuring equivalent durability and switch life expectancy.