FSMRA3J Equivalent & Substitute Parts

Part Overview

The FSMRA3J is a tactile switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a SPST-NO (Single Pole Single Throw Normally Open) device with side actuation and through-hole right-angle mounting. The switch is rated for 0.05A at 24VDC and features an off-momentary switch function with 160gf operating force and 0.30mm switch travel. The FSMRA3J is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain electrical performance, mechanical compatibility, and functional equivalence to ensure seamless integration into existing circuit designs.

Key Parameters

Parameter	Value
Circuit Configuration	SPST-NO
Contact Rating	0.05A @ 24VDC
Switch Function	Off-Mom (Momentary)
Mounting Type	Through Hole, Right Angle
Actuator Orientation	Side Actuated
Termination Style	PC Pin
Outline Dimensions	7.11mm x 6.60mm
Operating Force	160gf
Mechanical Life	100,000 Cycles
Series	FSMRAJ

Substitute Part Grouping Explanation

Substitution of the FSMRA3J is based on strict equivalence of electrical and mechanical parameters. The substitute part 1825027-8 maintains identical circuit configuration (SPST-NO), contact rating (0.05A @ 24VDC), switch function (Off-Mom), mounting type (Through Hole, Right Angle), actuator orientation (Side Actuated), termination style (PC Pin), outline dimensions (7.11mm x 6.60mm), operating force (160gf), and mechanical life (100,000 Cycles). Both parts belong to the FSMRAJ series and share the same base product classification. The substitute part is classified as active product status, ensuring ongoing availability and supply chain support. Substitution is valid where these core parameters remain constant across the application circuit and PCB layout.

Parameter Comparison

Parameter	FSMRA3J (Main Part)	1825027-8 (Substitute)
Manufacturer	TE Connectivity ALCOSWITCH Switches	TE Connectivity ALCOSWITCH Switches
Series	FSMRAJ	FSMRAJ
Circuit Configuration	SPST-NO	SPST-NO
Switch Function	Off-Mom	Off-Mom
Contact Rating @ Voltage	0.05A @ 24VDC	0.05A @ 24VDC
Actuator Type	Standard	Standard
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle
Actuator Length, Right Angle	5.85mm	5.85mm
Actuator Orientation	Side Actuated	Side Actuated
Termination Style	PC Pin	PC Pin
Outline	7.11mm x 6.60mm	7.11mm x 6.60mm
Illumination	Non-Illuminated	Non-Illuminated
Operating Force	160gf	160gf
Switch Travel	0.30mm	0.25mm
Mechanical Life	100,000 Cycles	100,000 Cycles
Operating Temperature	-20°C ~ 70°C	-20°C ~ 105°C
Actuator Material	Acetal	Polyamide (PA), Nylon
Product Status	Obsolete	Active
ECCN	EAR99	EAR99
HTSUS	8536.50.9031	8536.50.9031

Engineering Selection Recommendations

The substitute part 1825027-8 is the direct equivalent for the obsolete FSMRA3J. Selection of 1825027-8 is supported by active product status, ensuring long-term availability and supply chain continuity. The substitute maintains all critical electrical parameters: SPST-NO circuit configuration, 0.05A @ 24VDC contact rating, and momentary switch function. Mechanical compatibility is preserved through identical mounting type (Through Hole, Right Angle), outline dimensions (7.11mm x 6.60mm), actuator orientation (Side Actuated), and operating force (160gf). The substitute part features an extended operating temperature range (-20°C ~ 105°C) compared to the main part (-20°C ~ 70°C), providing enhanced thermal performance. Switch travel differs slightly (0.25mm versus 0.30mm), and actuator material differs (Polyamide/Nylon versus Acetal); these variations remain within functional equivalence for the specified application. The substitute part is ROHS3 compliant and carries EAR99 export classification, matching the regulatory profile of the original part.

Frequently Asked Questions (FAQ)

Question	Answer
Can 1825027-8 directly replace FSMRA3J in existing designs?	Yes. Both parts share identical circuit configuration (SPST-NO), contact rating (0.05A @ 24VDC), mounting type (Through Hole, Right Angle), outline dimensions (7.11mm x 6.60mm), and operating force (160gf). PCB layouts and circuit designs require no modification.
What is the difference in switch travel between the two parts?	FSMRA3J has 0.30mm switch travel, while 1825027-8 has 0.25mm switch travel. Both values fall within the functional range for momentary switch applications at the specified 0.05A @ 24VDC rating.
Are there material differences between the parts?	Yes. FSMRA3J uses Acetal actuator material, while 1825027-8 uses Polyamide (PA) Nylon. Both materials are suitable for the operating temperature and mechanical life specifications of the application.
What is the operating temperature range for each part?	FSMRA3J operates from -20°C to 70°C. The substitute 1825027-8 operates from -20°C to 105°C, providing a wider thermal operating window.
Is 1825027-8 RoHS compliant?	Yes. 1825027-8 is ROHS3 compliant. FSMRA3J compliance status was not specified in the provided data.
What is the packaging difference?	FSMRA3J packaging was not specified. 1825027-8 is supplied in Bulk packaging.
Are both parts from the same manufacturer?	Yes. Both FSMRA3J and 1825027-8 are manufactured by TE Connectivity ALCOSWITCH Switches and belong to the FSMRAJ series.
What is the mechanical life rating for both parts?	Both parts are rated for 100,000 mechanical cycles, ensuring equivalent durability and reliability in momentary switch applications.