FSM8J Equivalent & Substitute Parts

Part Overview

The FSM8J is a tactile switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a SPST-NO (Single Pole Single Throw Normally Open) device rated for 0.05A at 24VDC. This switch features top actuation, through-hole mounting, and is designed for momentary (Off-Mom) operation with a 9.50mm actuator height and 6.00mm x 6.00mm outline footprint.

The FSM8J is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this tactile switch configuration.

Substiute Parts

FSM8J

TE Connectivity ALCOSWITCH SwitchesIn Stock: 1013FSM8J Datasheet

Current PartRFQ

1-1825910-4

TE Connectivity ALCOSWITCH SwitchesIn Stock: 24291-1825910-4 Datasheet

DirectRFQ

TL1105BF160Q

E-SwitchIn Stock: 10134TL1105BF160Q Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FSM8J are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

• Circuit configuration (SPST-NO)
• Switch function (Off-Mom momentary operation)
• Contact rating (0.05A minimum at rated voltage)
• Mounting type (Through Hole)
• Actuator orientation (Top Actuated)
• Actuator height (9.50mm)
• Outline footprint (6.00mm x 6.00mm)
• Termination style (PC Pin)
• Operating force (160gf)
• Switch travel (0.25mm)
• Mechanical life (100,000 Cycles minimum)

Substitute parts must maintain these parameters to ensure direct replacement capability in PCB layouts and circuit applications. Variations in contact voltage rating, operating temperature range, actuator material, and product status are noted but do not preclude substitution when the primary criteria are satisfied.

Parameter Comparison

Engineering Selection Recommendations

1-1825910-4 (TE Connectivity ALCOSWITCH Switches)

The 1-1825910-4 is an active product from the same manufacturer and series (FSMJ) as the FSM8J. This part maintains identical electrical and mechanical specifications including 0.05A @ 24VDC contact rating, 9.50mm actuator height, and 6.00mm x 6.00mm footprint. The 1-1825910-4 offers an extended operating temperature range (-35°C ~ 85°C) compared to the FSM8J (-20°C ~ 70°C) and features PBT actuator material with ROHS3 compliance and MSL 1 rating. Active product status ensures ongoing availability and supply chain continuity.

TL1105BF160Q (E-Switch)

The TL1105BF160Q is an active product from E-Switch that satisfies all primary mechanical and functional compatibility criteria. This part maintains the same circuit configuration (SPST-NO), mounting type (Through Hole), actuator height (9.50mm), outline (6.00mm x 6.00mm), operating force (160gf), and switch travel (0.25mm). The contact rating is specified at 0.05A @ 12VDC, which differs from the FSM8J 24VDC rating. The TL1105BF160Q features polyamide actuator material, ROHS3 compliance, and MSL 1 rating. This part is suitable for applications operating at 12VDC or lower voltage levels.

Frequently Asked Questions (FAQ)

Q: Can the 1-1825910-4 directly replace the FSM8J in existing PCB designs?

A: Yes. The 1-1825910-4 maintains identical mechanical dimensions (9.50mm height, 6.00mm x 6.00mm outline), termination style (PC Pin), and electrical specifications (0.05A @ 24VDC). The part is pin-compatible and footprint-compatible with the FSM8J.

Q: What is the primary difference between the 1-1825910-4 and FSM8J?

A: The 1-1825910-4 is an active product with an extended operating temperature range (-35°C ~ 85°C versus -20°C ~ 70°C), PBT actuator material instead of Acetal, and ROHS3 compliance with MSL 1 rating. Electrical and mechanical specifications are identical.

Q: Can the TL1105BF160Q replace the FSM8J?

A: The TL1105BF160Q is mechanically and functionally compatible with the FSM8J for all primary parameters. However, the contact voltage rating differs: TL1105BF160Q is rated 0.05A @ 12VDC while FSM8J is rated 0.05A @ 24VDC. The TL1105BF160Q is suitable for 12VDC applications and lower voltage circuits.

Q: What are the key parameters that must match for substitution?

A: Critical parameters include circuit configuration (SPST-NO), switch function (Off-Mom), mounting type (Through Hole), actuator orientation (Top Actuated), actuator height (9.50mm), outline footprint (6.00mm x 6.00mm), termination style (PC Pin), operating force (160gf), switch travel (0.25mm), and mechanical life (100,000 Cycles).

Q: Are both substitute parts ROHS3 compliant?

A: Yes. Both the 1-1825910-4 and TL1105BF160Q are ROHS3 compliant. The FSM8J does not specify RoHS status.

Q: What is the difference in packaging between the FSM8J and substitute parts?

A: The FSM8J is specified with "-" packaging notation. Both substitute parts (1-1825910-4 and TL1105BF160Q) are supplied in Bulk packaging.

Q: Which substitute part offers the widest operating temperature range?

A: The 1-1825910-4 offers the widest operating temperature range at -35°C ~ 85°C, compared to the FSM8J and TL1105BF160Q which both operate from -20°C ~ 70°C.

Q: Are all three parts REACH compliant?

A: Yes. The FSM8J, 1-1825910-4, and TL1105BF160Q all have REACH Unaffected status.