FSMRA4J Equivalent & Substitute Parts

Part Overview

The FSMRA4J is a tactile switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a SPST-NO (Single Pole Single Throw Normally Open) device with a contact rating of 0.05A at 24VDC. This switch features side actuation, through-hole right-angle mounting, and is designed for off-momentary operation with an operating force of 160gf and mechanical life rating of 100,000 cycles.

The FSMRA4J carries an obsolete product status. Identification of equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this switch specification remains functionally required.

Substiute Parts

FSMRA4J

TE Connectivity ALCOSWITCH SwitchesIn Stock: 839FSMRA4J Datasheet

Current PartRFQ

1-1825027-1

TE Connectivity ALCOSWITCH SwitchesIn Stock: 19241-1825027-1 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSMRA4J is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Circuit configuration (SPST-NO), contact rating (0.05A @ 24VDC), and switch function (Off-Mom) must remain identical.

Mechanical Parameters: Mounting type (Through Hole, Right Angle), actuator orientation (Side Actuated), actuator length (8.35mm), outline dimensions (7.11mm x 6.60mm), operating force (160gf), and switch travel distance must be compatible.

Environmental Parameters: Operating temperature range (-20°C ~ 105°C) and moisture sensitivity level (MSL 1) must be maintained.

Termination Parameters: Termination style (PC Pin) must match the original specification.

The substitute part 1-1825027-1 satisfies all critical electrical, mechanical, and environmental parameters required for direct substitution. Minor variations in actuator material composition and switch travel distance (0.25mm versus 0.30mm) remain within functional tolerance for this switch category and do not affect circuit performance or mechanical fit.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 1-1825027-1

The part 1-1825027-1 is the direct equivalent substitute for the obsolete FSMRA4J. This substitute maintains identical electrical specifications, mechanical dimensions, and environmental operating parameters. The substitute carries an active product status, ensuring ongoing availability and supply chain continuity.

The substitute part demonstrates enhanced regulatory compliance through ROHS3 certification, providing additional assurance for applications subject to European Union Restriction of Hazardous Substances directives. Both the original and substitute parts maintain REACH Unaffected status and share identical ECCN (EAR99) and HTSUS (8536.50.9031) classifications.

Material composition differs between the original (Acetal) and substitute (Polybutylene Terephthalate) actuators; however, both materials are standard for this switch category and provide equivalent mechanical performance within the specified operating force and temperature range. Switch travel variation (0.30mm to 0.25mm) represents a minor reduction that does not affect functional operation or circuit compatibility.

The substitute part is available in bulk packaging with higher inventory levels (1900 units) compared to the original part (729 units), supporting both immediate component requirements and long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can the 1-1825027-1 be used as a direct replacement for the FSMRA4J in existing designs?

A: Yes. The 1-1825027-1 maintains identical electrical ratings (0.05A @ 24VDC, SPST-NO), mechanical dimensions (7.11mm x 6.60mm outline, 8.35mm actuator length), mounting configuration (through-hole right angle), and operating parameters (160gf operating force, -20°C to 105°C temperature range). PCB layout and circuit design require no modification.

Q: What is the significance of the switch travel difference between the two parts?

A: The FSMRA4J specifies 0.30mm switch travel while the 1-1825027-1 specifies 0.25mm. Both values fall within the functional range for tactile switches in this category and do not affect electrical performance, contact closure reliability, or mechanical durability. The difference reflects normal manufacturing variation within the FSMRAJ series.

Q: Does the actuator material change from Acetal to PBT affect performance?

A: No. Both Acetal and Polybutylene Terephthalate (PBT) are standard actuator materials for tactile switches operating within the specified temperature range (-20°C to 105°C) and mechanical life rating (100,000 cycles). Material selection does not impact electrical characteristics, operating force, or reliability.

Q: Is the 1-1825027-1 compliant with current regulatory requirements?

A: Yes. The 1-1825027-1 carries ROHS3 compliance certification and maintains REACH Unaffected status, identical to the original part. Both components share the same ECCN (EAR99) and HTSUS (8536.50.9031) classifications, ensuring equivalent regulatory treatment.

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

A: The 1-1825027-1 is supplied in bulk packaging. The original FSMRA4J packaging format is not specified in available documentation. Bulk packaging is suitable for production assembly operations and component inventory management.

Q: Are there any circuit design considerations when substituting this part?

A: No circuit design modifications are required. The substitute part maintains identical SPST-NO circuit configuration, off-momentary switch function, and 0.05A @ 24VDC contact rating. Existing PCB traces, connector assignments, and control logic remain unchanged.

Q: What is the mechanical life expectancy of the substitute part?

A: The 1-1825027-1 is rated for 100,000 mechanical cycles, identical to the original FSMRA4J. This rating applies to the actuator mechanism and contact cycling under specified operating conditions.