Tactile Switches 6mm G TERM OFF-(ON)
Research Notes
1. What this is
FSM4JSMA is a TE/Alcoswitch FSM tactile switch.
2. Part-number decode
- Series: TE/Alcoswitch FSM
- Type: tactile switch
3. Compatibility & ordering
TE Connectivity / Alcoswitch makes pushbutton, toggle, slide, and tactile switches for electronics and industrial equipment. Match by type, actuation, illumination, sealing, and mounting, then use the manufacturer datasheet to confirm the exact contact and termination encoded in the part number.
4. Data-quality note
The TE/Alcoswitch product line/type is identified; the detailed configuration is left to the datasheet rather than guessed. Flagged decoded-partial.
5. Sources
- TE/Alcoswitch product catalog (te.com)
- Distributor listing (DigiKey / Mouser) — search the exact part number
1 source
- TE/Alcoswitch — FSM4JSMA — te.com
Specifications
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Device class
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tactile switch
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Enriched by
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te-alcoswitch-decoder-2026-08-12
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Lead time
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108 Days
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Manufacturer series
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FSM
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Mouser part number
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506-FSM4JSMA
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Pn status
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decoded-partial
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Rohs status
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RoHS Compliant
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Series description
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TE/Alcoswitch FSM-series tactile / detect switch (PCB)
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Installation Quick Reference
Panel cutout: 22mm. Insert from the front of the panel, secure with mounting nut from behind (tighten to 2-3 Nm).
Contact block: Snap or screw the contact block onto the rear of the button body. Ensure the contact block orientation matches the wiring diagram — NO terminals are usually marked.
Wiring: Use 0.5-2.5mm² stranded wire with ferrules. Tighten screw terminals to 0.8 Nm. Test the button function before energizing the circuit.
Dimensions
Troubleshooting
Button doesn't respond when pressed
Check the contact block first — it's the most common failure point. Test continuity across the NO or NC terminals with a multimeter. If no click is felt, the return spring in the head may be broken.
Works intermittently
Contact block contacts are pitted or burned. Replace the contact block — don't try to file the contacts. Check if the rated cycle count has been exceeded.
Button feels mushy or doesn't click
The spring return mechanism in the button head is worn. Replace the head. The contact block can usually be reused if it tests OK.
Quick Specs
- Device class
- tactile switch
- Enriched by
- te-alcoswitch-decoder-2026-08-12
- Lead time
- 108 Days
- Manufacturer series
- FSM
- Mouser part number
- 506-FSM4JSMA
