Identity correction: The current project description calls this an SPDT ON–ON toggle switch. That is incorrect for AS11CH: the manufacturer identifies it as an SPST ON–OFF slide switch, and the datasheet explicitly omits terminal 2 on single-throw models. This guide does not validate or modify the current symbol, footprint, pad count, or 3D model.

Text
VLOGIC (3.3 V or 5 V, matching the receiver)
   |
 R1 10 kΩ
   |
   +---------- MCU GPIO input
   |
 AS11CH terminal 3
   / maintained SPST contact
 AS11CH terminal 1
   |
  GND

• R1 is required for this example unless another adequately specified pull-up supplies the same bias. ON reads LOW; OFF reads HIGH. An open contact cannot by itself define a logic level.
• Calculated closed-contact current is I = VLOGIC/R1: 0.33 mA at 3.3 V and 0.50 mA at 5 V. Both are inside the switch's published 0.1 mA–0.1 A applicable range. Resistor dissipation is approximately 1.09 mW and 2.5 mW respectively; select resistance tolerance against GPIO leakage and logic thresholds.
• Do not assume a weak internal pull-up is adequate for the contact application range. For example, an assumed 100 kΩ pull-up at 3.3 V would produce only 33 µA, below the published 0.1 mA minimum.
• Debounce in firmware. As an engineering starting point, accept a new state only after it remains unchanged for 20 ms, then validate that interval using real switches across temperature and life. A guaranteed maximum bounce time was not verified; 20 ms is not a manufacturer specification. Avoid making an irreversible action on the first GPIO edge.
• No decoupling capacitor is required by the passive switch itself. Decouple the MCU or buffer according to its own datasheet. If hardware filtering is needed, design an RC network with a Schmitt-trigger receiver, evaluate both edge timings, and limit capacitor-discharge current rather than placing an unrestricted large capacitor directly across the contacts.
• For a power-enable function, switch the regulator's enable input with a defined inactive bias rather than its load current. Check enable thresholds, leakage, startup requirements, and default state against that regulator's datasheet.

• Use the exact H-terminal mechanical drawing. Preserve electrical and bracket mounting features, and account for the absent terminal 2 on AS11. Pitch, finished-hole sizes, annular rings, and mechanical tolerances remain unverified here; do not substitute a generic three-pin SPDT footprint. Check the resulting hole and pad dimensions against JLCPCB's selected process before release.
• Provide actuator access and strain support. C specifies a 3.8 mm actuator and H specifies a right-angle bracket. Keep the actuator's full movement clear of the enclosure and neighboring parts, and locate board supports to avoid flex during operation.
• Use solder-friendly plane connections. For a grounded contact attached to a large copper plane, use fabrication-compatible thermal relief to support consistent through-hole soldering. Follow the selected assembly process rather than prescribing an arbitrary spoke geometry.
• Route as a low-current input, not a power path. Keep the GPIO sense route short, away from switching nodes, and referenced to ground. Size copper for actual current, copper thickness, and temperature rise; widening copper does not increase the switch's 0.4 VA contact rating. Differential-pair routing is not applicable.
• Place support circuitry at the receiver and respect cleaning limits. Keep any filter near the GPIO/buffer and its local return. NKK recommends wave soldering Profile A and single-pole manual soldering Profile B; the switches are not process sealed and require local hand cleaning with an alcohol-based solution. Numeric profile temperature/time limits were not verified from the referenced supplement; obtain that processing document before assembly release.

1. Mistaking the circuit or overrating the contacts. AS11CH is SPST, not SPDT; it cannot select between two sources, and terminal 2 is absent. The rating is 0.4 VA, not 0.4 A, and voltage/current maxima cannot all be used simultaneously. Do not directly switch motors, relay coils, large capacitive loads, or mains using this logic-level rating.
2. Treating the input as inherently clean and defined. Omitting the pull-up leaves the OFF-state GPIO floating; omitting debounce can create repeated events. Also do not equate epoxy terminal sealing with a washable or waterproof assembly: NKK states these devices are not process sealed and specifies local hand cleaning.

• NKK Switches, Series AS — Subminiature Slides: manufacturer datasheet, Aslides.pdf. Sections used: General Specifications; Poles & Circuits; Actuators; PC Terminals; Typical Switch Dimensions; Processing. Explicit revision/date was not verified. Exact PCB drawing dimensions and numeric solder profiles remain unresolved.
• NKK Switches, AS11CH exact-part record: manufacturer product page. No publication date displayed in the retrieved record.
• NKK Switches, CN-0331: A Indicators & AS Slides production/marking change notice, dated 26 April 2018, effective January 2019. It documents marking and production-location changes without dimensional or specification changes; use it when evaluating marking differences, not as evidence of arbitrary substitute compatibility.
• C&K, JS Series — Sub-Miniature Slide Switches: manufacturer-hosted current document and manufacturer-authored datasheet copy used for verified extraction. Revision/date of the extracted copy was not verified; its series-standard rating must not be extrapolated to other options.
• E-Switch, EG Series: manufacturer product page with EG1218 selected and manufacturer-authored EG datasheet. Explicit revision/date not verified.
• Mouser, AS11CH: exact-part listing. Used for packaging and minimum order, not electrical limits.
• Future Electronics, AS11CH: exact-part listing. Used for bag packaging and minimum-order terms. Its displayed 0.4 A attribute conflicts with NKK's 0.4 VA rating and was not adopted.
• DigiKey, AS11CH: exact-part listing. Direct page access failed; packaging and MOQ were not treated as verified.