FSM1SJMTR Equivalent & Substitute Parts

Part Overview

The FSM1SJMTR is a tactile switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a SPST-NO (Single Pole Single Throw - Normally Open) momentary contact switch. This surface mount component is rated for 0.05A at 24VDC and features a sealed, fully waterproof design with IP67 ingress protection. The part is currently classified as obsolete, necessitating identification of equivalent substitute components for ongoing production and maintenance applications.

Substiute Parts

FSM1SJMTR

TE Connectivity ALCOSWITCH SwitchesIn Stock: 1094FSM1SJMTR Datasheet

Current PartRFQ

147873-2

TE Connectivity ALCOSWITCH SwitchesIn Stock: 950355147873-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSM1SJMTR is based on strict electrical and mechanical compatibility criteria. The substitute part 147873-2 maintains functional equivalence through the following key parameters:

Electrical Compatibility:

• Identical circuit configuration (SPST-NO)
• Identical switch function (Off-Mom momentary operation)
• Identical contact rating (0.05A @ 24VDC)
• Identical operating temperature range (-35°C ~ 85°C)

Mechanical Compatibility:

• Identical mounting type (Surface Mount)
• Identical actuator type (Rectangular Button)
• Identical actuator orientation (Top Actuated)
• Identical termination style (J Lead)

Environmental & Compliance:

• Identical moisture sensitivity level (MSL 1)
• Identical ECCN classification (EAR99)
• Identical HTSUS code (8536.50.9031)

The substitute part 147873-2 is manufactured by the same supplier (TE Connectivity ALCOSWITCH Switches) and carries an active product status, making it suitable for replacement in applications where the FSM1SJMTR is no longer available.

Parameter Comparison

Engineering Selection Recommendations

The 147873-2 serves as the direct functional equivalent to the obsolete FSM1SJMTR. Selection of this substitute is based on the following engineering criteria:

Product Status Alignment: The 147873-2 maintains active product status with TE Connectivity ALCOSWITCH Switches, ensuring continued availability and supply chain reliability compared to the obsolete FSM1SJMTR.

Electrical Equivalence: Both components share identical electrical specifications: SPST-NO circuit configuration, 0.05A @ 24VDC contact rating, and momentary switch function. These parameters ensure direct functional replacement in existing circuit designs.

Mechanical Compatibility: Both parts feature identical mounting type (Surface Mount), actuator type (Rectangular Button), actuator orientation (Top Actuated), and termination style (J Lead). The actuator height of 4.30mm is identical, supporting PCB layout compatibility.

Environmental & Compliance Equivalence: Both components maintain MSL 1 moisture sensitivity level, identical ECCN classification (EAR99), and identical HTSUS code (8536.50.9031), ensuring regulatory and environmental compliance parity.

Physical Footprint Considerations: The 147873-2 features a smaller outline (6.00mm x 3.50mm) compared to the FSM1SJMTR (6.80mm x 4.70mm). PCB layout verification is required to confirm that the reduced footprint accommodates existing design constraints.

Operational Characteristic Variations: The 147873-2 exhibits higher operating force (180gf versus 130gf) and reduced switch travel (0.25mm versus 0.35mm), resulting in a shorter mechanical life rating (40,000 cycles versus 50,000 cycles). These differences reflect design optimization in the active substitute part and do not affect functional equivalence for standard momentary switch applications.

Frequently Asked Questions (FAQ)

Q: Can the 147873-2 directly replace the FSM1SJMTR in existing designs?

A: The 147873-2 provides direct electrical and functional replacement for the FSM1SJMTR. Both components share identical circuit configuration (SPST-NO), contact rating (0.05A @ 24VDC), mounting type (Surface Mount), and operating temperature range (-35°C ~ 85°C). PCB layout verification is required due to differences in outline dimensions (147873-2: 6.00mm x 3.50mm versus FSM1SJMTR: 6.80mm x 4.70mm).

Q: What are the key differences between these two parts?

A: The primary differences are outline dimensions, operating force, switch travel, mechanical life, and actuator material. The 147873-2 has a smaller footprint, higher operating force (180gf versus 130gf), shorter switch travel (0.25mm versus 0.35mm), lower mechanical life rating (40,000 versus 50,000 cycles), and uses Polyphenylene Sulfide (PPS) actuator material instead of Thermoplastic. Electrical specifications and environmental ratings remain identical.

Q: Is the 147873-2 available in the same packaging as the FSM1SJMTR?

A: The 147873-2 is supplied in Cut Tape (CT) packaging. The FSM1SJMTR packaging specification was not provided in the available documentation. Packaging compatibility should be confirmed with your procurement requirements.

Q: Does the 147873-2 maintain the same ingress protection rating?

A: The FSM1SJMTR specifies IP67 ingress protection (Dust Tight, Waterproof). The 147873-2 ingress protection specification was not provided in the available documentation. Ingress protection requirements should be confirmed for applications requiring sealed or waterproof operation.

Q: Are there compliance or regulatory differences between these parts?

A: Both components share identical ECCN classification (EAR99), HTSUS code (8536.50.9031), and MSL rating (MSL 1 - Unlimited). The 147873-2 carries RoHS3 compliance and REACH Unaffected status. Compliance documentation should be reviewed for specific regulatory requirements.

Q: What is the impact of the higher operating force in the 147873-2?

A: The 147873-2 requires 180gf operating force compared to 130gf for the FSM1SJMTR. This represents a 38% increase in actuation force. Applications with specific force requirements or user interface considerations should evaluate this parameter for compatibility with intended use.

Q: How does the reduced mechanical life of the 147873-2 affect long-term reliability?

A: The 147873-2 is rated for 40,000 mechanical cycles compared to 50,000 cycles for the FSM1SJMTR. This represents a 20% reduction in rated mechanical life. Applications with high-cycle actuation requirements should evaluate this specification against expected operational demands.