KSC422G 70SH LFS - Sealed SMT Tactile Switch, 1.7N, IP67 | C&K
MPN: KSC422G ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.4 | $4.00 |
| 100 | $0.34 | $34.00 |
| 500 | $0.29 | $145.00 |
| 1,000 | $0.25 | $250.00 |
| 3,000 | $0.22 | $660.00 |
KSC422G Overview
A tactile switch is an electromechanical component that completes a circuit only while a user is actively pressing the actuator; once released, an internal spring returns the dome and re-opens the contacts. Within the broader electromechanical hierarchy, tactile switches sit alongside pushbuttons, detect switches, and DIP switches as user-input devices, and the IP-rated sealed variants extend the family into industrial, automotive, and outdoor applications where dust and moisture would defeat a non-sealed part.
Key features include a positive tactile feel with a defined click, six available actuation forces (130 gf to 750 gf) across the KSC4 series, gull-wing or J-bend termination options, IP67 sealing, and a soft actuator compatible with potting. The switch is single-pole single-throw normally open (SPST-NO) and rated for 1 million operations, making it suitable for high-life user-interface designs.
The KSC422G uses a stainless-steel dome contact mechanism over a gold- or silver-plated copper alloy terminal system, with a thermoplastic housing that is UL94 V-0 rated. The sealed construction and top-actuation geometry let engineers place the part on a top panel or board edge while keeping the solder joints protected beneath the housing.
Typical applications include industrial control panel buttons, outdoor remote-control keypads, automotive center-stack switches, medical device user interfaces, and any sealed human-machine interface exposed to water spray or dust. The 1.7 N operating force gives a deliberate click that resists accidental activation in high-vibration environments.
When designing with the KSC422G, observe the recommended 6.2 x 6.2 mm land pattern and place the part on a board edge or recessed opening so the actuator can travel without obstruction. For potting-friendly parts, leave at least 0.5 mm of clearance around the actuator cap so the soft actuator is not preloaded by the encapsulant.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes for the KSC422G 70SH LFS that are not aggregated in a single manufacturer document.
Drop-in alternatives for KSC422G — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
KSC421G70SHLFS
✅ Drop-In📋 Reference alternative (not in catalog)
KSC423G70SHLFS
✅ Drop-In📋 Reference alternative (not in catalog)
KSC422G70SHPF
✅ Drop-In📋 Reference alternative (not in catalog)
KSC422G50LFS
✅ Drop-In📋 Reference alternative (not in catalog)
KSC424G70SHLFS
✅ Drop-In📋 Reference alternative (not in catalog)
KSC422G Maximum Ratings & Electrical Characteristics
| Switch Function | Momentary (SPST-NO) |
| Contact Arrangement | 1 Form A (SPST-NO) |
| Actuator Type | Top actuated, round button |
| Operating Force | 1.7 N (170 gf) |
| Current Rating (Max) | 50 mA |
| Voltage Rating DC (Max) | 32 V |
| Mechanical Life | 1,000,000 cycles |
| IP Rating | IP67 |
| Termination Style | Gull-wing (G leads), surface mount |
| Body Dimensions | 6.2 x 6.2 mm |
| Actuator Height | 5.1 mm (5.2 mm PF variant) |
| Operating Temperature | -40C to +85C |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel |
| RoHS Status | Compliant |
| Potting Friendly | Yes (PF suffix variant) |
KSC422G Pin Configuration
| Pin 1 | Terminal 1 — Common contact, gull-wing SMT pad |
| Pin 2 | Terminal 2 — Normally open contact, gull-wing SMT pad |
| Pin 3 | Mount Tab 1 — Mechanical mounting tab, soldered for board retention |
| Pin 4 | Mount Tab 2 — Mechanical mounting tab, soldered for board retention |
Typical Applications
KSC422G is suitable for 6 applications: Industrial Control Panel Buttons, Outdoor Remote Control Keypads, Automotive Center Stack Switches, Medical Device User Interfaces, Marine and Pool Equipment Controls, Heavy-Duty Handheld Scanner Buttons.
Industrial Control Panel Buttons
The KSC422G 70SH LFS suits industrial control panels because its IP67 sealing blocks dust and water ingress, its 1.7 N operating force resists accidental activation in vibrating factory environments, and its 1M-cycle life supports years of repeated operator use. Place the switch on a board edge with the actuator protruding through a panel cut-out, and add a silicone gasket around the cut-out to maintain the panel-level IP rating. The 50 mA / 32 VDC rating is well-matched to PLC discrete inputs and 24V industrial logic.
Recommended
Outdoor Remote Control Keypads
Outdoor remote controls for gates, lighting, and industrial equipment benefit from the KSC422G's IP67 sealing and gull-wing SMT terminations that hold up to thermal cycling. The 1.7 N force provides a deliberate click that users can feel through gloves, while the 5.1 mm actuator height accommodates a recessed keypad with a protective overlay. Pair the switch with a low-power MCU input and use the 1M-cycle rating to support a 10-year product lifetime at 300 actuations per day.
Recommended
Automotive Center Stack Switches
Automotive center-stack and steering-wheel buttons demand IP67 sealing against spills and condensation, plus a tactile feel that survives years of use. The KSC422G 70SH LFS meets these needs with its sealed construction, 1.7 N click, and 1M-cycle rating. For under-hood or exterior applications, select the KSC422G 70SH LFS PF variant so the soft actuator survives potting compound. Use the part on a flexible PCB or rigid board with strain-relief features to handle vibration.
Recommended
Medical Device User Interfaces
Medical device front panels require sealed, cleanable switches that survive repeated disinfection with isopropyl alcohol or bleach wipes. The KSC422G 70SH LFS's IP67 sealing and SMT gull-wing package allow sealed membrane overlays to be bonded directly over the actuator. The 1.7 N force provides clear tactile feedback to clinicians wearing gloves, and the 50 mA / 32 VDC rating is well-matched to low-voltage medical logic rails. The 1M-cycle rating supports typical medical equipment service life.
Recommended
Marine and Pool Equipment Controls
Marine chart plotters, fish-finder keypads, and pool automation panels operate in environments with constant humidity and occasional water spray. The KSC422G 70SH LFS IP67 sealing and gull-wing SMT terminations are designed for these conditions. The 1.7 N operating force prevents accidental activation on a rocking boat, and the actuator height of 5.1 mm works with a recessed panel gasket. For submerged applications, select the PF potting-friendly variant and encapsulate the switch in epoxy.
Recommended
Heavy-Duty Handheld Scanner Buttons
Industrial barcode scanners and ruggedized PDAs use the KSC422G 70SH LFS for scan triggers and function keys because the IP67 sealing survives drops into puddles and the 1.7 N force requires an intentional press to avoid accidental scans. The gull-wing SMT terminations survive reflow and rework during ruggedization, and the 5.1 mm actuator height fits the slim profile of a handheld scanner. The 1M-cycle rating covers high-volume warehouse and logistics use cases.
Recommended
Recommended Products Summary
Engineering reference data for KSC422G — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSC421G70SHLFS | KSC423G70SHLFS | KSC422G70SHPF | KSC422G50LFS |
|---|---|---|---|---|---|
| Brand | C&K | C&K | C&K | C&K | C&K |
| Package | 6.2 x 6.2 mm Gull-wing | 6.2 x 6.2 mm Gull-wing - same | 6.2 x 6.2 mm Gull-wing - same | 6.2 x 6.2 mm Gull-wing - same | 6.2 x 6.2 mm Gull-wing - same |
| Operating Force | 1.7 N (170 gf) | 1.6 N | 2.0 N | 1.7 N | 1.3 N |
| IP Rating | IP67 | IP67 | IP67 | IP67 | IP67 |
| Current Rating | 50 mA | 50 mA | 50 mA | 50 mA | 50 mA |
| Voltage Rating | 32 VDC | 32 VDC | 32 VDC | 32 VDC | 32 VDC |
| Mechanical Life | 1,000,000 cycles | 1,000,000 cycles | 1,000,000 cycles | 1,000,000 cycles | 1,000,000 cycles |
| Potting Friendly | Optional (PF suffix) | Optional (PF suffix) | Optional (PF suffix) | Yes (PF version) | Optional (PF suffix) |
Key Differentiators
- Mid-force 1.7 N tactile feel in the KSC4 series (vs KSC421G70SHLFS (1.6 N))
- Standard rigid actuator (non-PF) (vs KSC422G70SHPF (potting-friendly))
- 70SH life grade - 1 million cycles (vs KSC422G50LFS (lower-force variant))
Design Notes
Use the C&K recommended land pattern of 6.2 x 6.2 mm with two 2.0 x 1.5 mm gull-wing pads on a 4.5 mm pitch. Solder the four mechanical mounting tabs to the board to provide mechanical strength against side loads on the actuator. Place the switch on a board edge or in a recessed cut-out so the 5.1 mm actuator can travel freely without obstruction. Estimated: clearance of 0.5 mm around the actuator cap is recommended to avoid preloading the dome.
Do not apply conformal coating or potting to the standard KSC422G 70SH LFS - the rigid coating will preload the dome and either cause constant-on behavior or shift the operating force. If your design requires encapsulation, order the KSC422G 70SH LFS PF variant which has a soft actuator designed to survive potting compound. Also, do not exceed 50 mA or 32 VDC - the switch is rated for signal-level loads and will fail if used to switch relays or motors directly.
Route the two switch traces as short and direct as possible, and place a 100 nF ceramic bypass capacitor on the nearby MCU input pin to debounce the contact. The KSC4 series datasheet specifies a typical bounce time of under 5 ms; software debounce of 10-20 ms is recommended for reliable detection. Keep high-current or high-voltage traces at least 2 mm away from the switch contacts to prevent arcing damage in fault conditions.
Compliance Information
RoHS and REACH compliant per C&K product page. Not AEC-Q100 qualified - the KSC4 series is a commercial/industrial grade tactile switch. Halogen-free status not explicitly stated in verified data.