SK24D28G6NS

FAQFrequently Asked Questions

• Can the SK24D28G6NS handle 5V logic signals directly, or do I need level shifting for microcontroller integration? The SK24D28G6NS is rated for 30V DC maximum, so 5V logic signals are well within its voltage specification. However, the switch itself is a passive mechanical component with no active logic output. You'll need to design your circuit so that the switch contacts connect to your microcontroller's input pins through appropriate pull-up or pull-down resistors (typically 10kΩ to 100kΩ). The 300mA current rating applies to the switch contacts themselves, not the logic signal path, so direct connection to a microcontroller input (which draws minimal current) is feasible without additional level-shifting circuitry.
• What is the practical difference between the SK24D28G6NS and other DP4T switches from C&K in terms of contact reliability under switching cycles? The SK24D28G6NS is rated for 10,000 mechanical and 10,000 electrical cycles with a non-shorting (break-before-make) contact architecture. This BBM timing means one contact path closes only after another opens, eliminating momentary shorts during switching transitions. For applications requiring higher cycle counts (50,000+ cycles), you may need to evaluate higher-grade industrial variants within the SK or COMAX series. The 10,000-cycle rating makes the SK24D28G6NS suitable for consumer and light industrial applications where the switch is not actuated hundreds of times per day.
• I need to switch different voltage levels (3.3V and 12V supplies) with a single switch—is the SK24D28G6NS suitable for this multiplexing application? The DP4T (double-pole, four-throw) configuration of the SK24D28G6NS supports routing two independent circuits with four positions each. Its 30V DC rating accommodates 3.3V and 12V supplies simultaneously on different contact pairs. However, you must ensure that the total current through any single contact pole does not exceed 300mA, and that your circuit design prevents cross-voltage conflicts. If you need to switch between multiple supply rails dynamically, the right-angle, through-hole mounting of the SK24D28G6NS makes it suitable for such designs, but careful PCB layout and contact assignment are necessary to avoid signal coupling or accidental shorts between different voltage domains.
• Will the SK24D28G6NS maintain reliable switching performance in outdoor or high-humidity industrial environments? The SK24D28G6NS has a Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), meaning it requires no special moisture-control handling during storage or deployment. Its operating temperature range of -20°C to 70°C covers most industrial environments. However, outdoor applications with condensation, salt spray, or corrosive atmospheres may cause contact degradation over time despite the silver contact finish. For harsh environments, consider conformal coating the assembly or selecting encapsulated switch variants. The non-shorting BBM contact design helps mitigate transient arcing issues, but long-term corrosion resistance depends on your protective measures rather than the switch alone.
• Can I replace a latching toggle switch with the SK24D28G6NS, or does it require continuous actuation to maintain a position? The SK24D28G6NS is a momentary-position switch with an On-On-On-On function, meaning each of its four positions is maintained only while the actuator is held in that position. Once released, the switch returns to a spring-centered position (depending on the specific internal mechanism). It is not a latching switch, so it cannot store a state without active mechanical force. If your application requires a latching or toggle behavior, you must implement that logic either through mechanical design (external spring positioning) or through firmware/software that polls the switch state and maintains a register value. Direct replacement of a latching switch with the SK24D28G6NS will result in loss of state retention.
• What are the implications of the SK24D28G6NS's 2mm switch travel distance for PCB layout and enclosure design? The 2mm switch travel is relatively shallow, which influences both mechanical and electrical design. The 6mm actuator length (standard type) combined with the 2mm travel means that the force gradient is compressed into a short distance, requiring about 200–300 grams-force (gf) to actuate. For PCB layout, the right-angle through-hole mounting means the switch mounts perpendicular to the board surface. Ensure that your enclosure provides at least 6mm of clearance above the PCB to accommodate the actuator stem and allow finger actuation. If your enclosure design places the switch flush with the surface, the shallow travel may make it difficult for users to reliably engage all four positions, potentially resulting in intermittent contact or user frustration.
• Is the SK24D28G6NS compatible with RoHS and REACH regulations for EU market deployment? The SK24D28G6NS carries a RoHS Status of 'Not applicable,' which typically indicates either that the product predates RoHS enforcement or that it does not fall under the regulated categories. Its REACH Status is listed as 'REACH Unaffected,' meaning it does not contain Substances of Very High Concern (SVHCs) at reportable levels. For EU market compliance, you should verify these statuses with your distributor or C&K's technical documentation, as component-level RoHS/REACH status can vary. If your end-product must achieve formal RoHS certification, confirm that the SK24D28G6NS's classification aligns with your product's compliance requirements.
• Can the SK24D28G6NS source or sink 300mA continuously, or is this a peak/intermittent rating? The 300mA current rating for the SK24D28G6NS refers to the maximum continuous DC current that the switch contacts can safely carry without excessive heating or contact wear. This is not a peak rating but rather a steady-state thermal limit. In practice, if you run 300mA continuously through the switch at 30V, the contact resistance and switching frequency will generate heat that may eventually degrade the contact finish. For designs requiring frequent switching at or near 300mA, thermal cycling and contact erosion will accelerate the approach toward the 10,000-cycle limit. If your application demands continuous 300mA operation with many switching events, consider using a relay or solid-state switch to extend the SK24D28G6NS's lifespan by limiting actual switch cycles.
• What migration path exists if I need to upgrade from the SK24D28G6NS to a switch with higher cycle count or voltage rating? The SK24D28G6NS is part of the base SK24D family within C&K's broader COMAX series. If you require higher mechanical or electrical cycle ratings, you can explore variant part numbers within the SK series that offer 50,000 or 100,000 cycle ratings. For higher voltage ratings (beyond 30V), you may need to transition to a different C&K switch family altogether, such as the SK16 or industrial-grade actuated switches. Any migration should preserve the DP4T circuit topology and through-hole mounting footprint to minimize PCB redesign. Before migration, verify pinout compatibility and contact load specifications, as different switch families may have different contact resistance or current handling characteristics.
• How does the non-shorting (BBM) contact timing of the SK24D28G6NS affect noise, EMI, or signal integrity in audio or analog applications? The break-before-make (BBM) contact timing ensures that when switching between positions, the previous contact breaks before the new contact establishes connection. This eliminates momentary shorts that could cause arcing, audible clicks in audio circuits, or transient current spikes. In audio applications, BBM reduces pops and glitches during position changes. However, the switch inherently introduces a brief open-circuit gap during the transition, which may cause brief signal dropout in streaming or continuous-signal applications. For high-frequency or sensitive analog circuits, the 2mm mechanical travel and 200–300gf operating force may introduce mechanical vibration or micro-vibrations that capacitively couple into nearby traces. Shield switch wiring and use star-grounding techniques to minimize noise coupling in such sensitive designs.
• If I operate the SK24D28G6NS at the lower temperature extreme of -20°C, will contact resistance increase or switching performance degrade? The SK24D28G6NS is rated for operation from -20°C to 70°C. At -20°C, the polyoxymethylene (POM) actuator material remains mechanically stable, but contact resistance may increase slightly due to reduced thermal activity and slower ion migration at metal contact surfaces. The silver contact finish is more stable than base metals, so resistance change should be minimal. However, the POM actuator's stiffness may increase at low temperatures, potentially raising the required operating force slightly above the nominal 200–300gf specification. If your application operates frequently at -20°C, measure contact resistance under load during thermal chamber testing to confirm acceptable voltage drop and current delivery before deployment.
• What are the design considerations for using the SK24D28G6NS as a mode selector in a battery-powered device with sleep-state power management? The SK24D28G6NS is a passive mechanical switch with no active power consumption. If used as a mode selector (e.g., selecting between standby, low-power, and active modes), the switch itself draws no current. However, if you use the switch to connect or disconnect pull-up/pull-down resistors or to select between different voltage rails, those resistive networks and supply connections will consume standby power. Design your sleep-state circuit so that the mode-select contacts are biased through high-impedance resistors (100kΩ to 1MΩ) to minimize quiescent drain. Ensure that the switch positions do not cause unintended short circuits between different supply domains during power-state transitions, as the BBM contact timing introduces a brief open period that may cause glitches in state machines or mode-change logic.
• Is the SK24D28G6NS suitable for hand-soldering during prototype assembly, or does the right-angle through-hole mounting require special techniques? The SK24D28G6NS's through-hole, right-angle mounting uses PC pins (printed circuit pins) that pass through the PCB and solder from the back side. This design is compatible with standard through-hole soldering techniques, including hand-soldering with a conventional iron. The right-angle orientation means the switch body extends perpendicular to the board, which can make access slightly more challenging than vertical-mount switches. For manual soldering, position the PCB so that the switch pins are accessible from the back, use appropriate solder temperature (350–380°C for lead-free), and apply heat to both the pin and the pad simultaneously to ensure reliable joint formation. If your prototype involves repeated reflow cycles, confirm that the POM actuator and contact material can tolerate the thermal cycling without deformation or contact degradation.
• Can multiple SK24D28G6NS switches be multiplexed together in a single control circuit, and if so, what are the isolation or contention risks? Multiple SK24D28G6NS switches can be integrated into a single circuit by connecting their contact pairs to a shared bus or to separate microcontroller inputs, depending on your application. If multiple switches route to the same signal line, ensure that each switch pair is isolated (e.g., through diodes or parallel-OR logic) to prevent one switch's contact impedance from affecting another's signal. If switches are independent, connect each to a separate microcontroller input and use software debouncing to handle the mechanical bounce during transitions (typically 5–20ms for slide switches). The DP4T topology allows up to two independent circuits, so if you need four separate control channels, you would require two SK24D28G6NS units. Always include current-limiting resistors or gate-drive protection to prevent backfeeding or current contention between different switch paths.
• How does the actuator material (POM) of the SK24D28G6NS affect long-term durability compared to metal or ceramic actuators? The SK24D28G6NS uses a polyoxymethylene (POM/Acetal) actuator, which is a durable engineering plastic offering good stiffness, low friction, and resistance to wear over the 10,000-cycle mechanical life. POM is stable across the -20°C to 70°C operating range and resistant to most chemicals. However, extended exposure to UV light, certain solvents (e.g., strong acids or bases), or continuous high temperatures above 70°C can cause POM to degrade or become brittle over time. Metal actuators (e.g., stainless steel) would provide superior durability in extreme chemical or thermal environments but would increase cost and weight. For indoor, temperature-controlled, or standard industrial environments, POM is adequate. If your application involves outdoor UV exposure or aggressive chemical atmospheres, consider conformal coating the actuator or selecting a variant with a reinforced or metal actuator.