{"product_id":"mini-bcd8421-rotary-encoder-band-knob-smd-switch-2-pack","title":"Mini BCD8421 Rotary Encoder Band Knob SMD Switch – 2 Pack","description":"\n\u003ch2\u003eMini BCD8421 Rotary Encoder Band Knob Switch SMD – 2 Pack\u003c\/h2\u003e\n\u003cp\u003eNeed precise, reliable switching in a compact form factor? These \u003cstrong\u003eMini BCD8421 Rotary Encoder Band Knob Switches\u003c\/strong\u003e are a must-have for electronics hobbyists, engineers, and makers. Each pack includes \u003cstrong\u003e2 pieces\u003c\/strong\u003e of high-quality SMD-compatible band switches, perfect for DIY electronics projects, PCB assemblies, and prototype builds.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBCD 8421 Encoding:\u003c\/strong\u003e Industry-standard Binary Coded Decimal output — ideal for digital circuits, microcontroller inputs, and programmable logic devices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Gear Selection:\u003c\/strong\u003e Dial-style rotary knob allows easy, tactile gear\/position selection with clear detents at each position.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSMD Compatible:\u003c\/strong\u003e Surface-mount design fits neatly onto PCBs for space-efficient circuit integration.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Alloy Construction:\u003c\/strong\u003e Built from quality alloy materials for long-lasting reliability in both prototyping and production environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight:\u003c\/strong\u003e Mini form factor makes these switches ideal where board space is limited.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand New \u0026amp; High Quality:\u003c\/strong\u003e 100% new components — not refurbished or used.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValue Pack:\u003c\/strong\u003e Comes as a 2-piece set so you always have a spare on hand.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Rotary Encoder \/ Band Knob Switch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEncoding:\u003c\/strong\u003e BCD 8421\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMount Type:\u003c\/strong\u003e SMD (Surface Mount Device)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 pcs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 × Mini BCD8421 Rotary Encoder Band Knob Switches\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Due to manual measurement, there may be up to 5mm deviation in dimensions. Slight color differences may occur due to lighting conditions in product photography.\u003c\/p\u003e\n\n\u003ch3\u003eExplore More From Our Store\u003c\/h3\u003e\n\u003cp\u003eLooking for other electronics components and maker supplies? Check out these related items:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-poster-inspirational-quote\"\u003e\"1% Better Every Day\" Motivational Canvas Poster | Wall Art\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/better-days-are-coming-motivational-canvas-wall-art-print\"\u003e\"Better Days Are Coming\" Motivational Canvas Wall Art Print\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on electronic component standards and safe handling of SMD components, visit the \u003ca href=\"https:\/\/www.nist.gov\/electronics\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eNational Institute of Standards and Technology (NIST) – Electronics Resources\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is a BCD8421 rotary encoder switch used for?\u003c\/h4\u003e\n\u003cp\u003eA: A BCD8421 rotary encoder switch outputs a Binary Coded Decimal (BCD) signal using the 8421 weighting scheme. It is commonly used in digital electronics, microcontroller interfaces, PLC systems, and circuit boards where a specific numeric or gear position needs to be encoded and read as a binary signal.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this switch compatible with SMD PCB assembly?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! This rotary encoder band switch is designed as a Surface Mount Device (SMD), making it fully compatible with SMD PCB layouts. Its compact footprint is ideal for modern board designs where through-hole components are not preferred.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many positions does the multi-gear band knob switch have?\u003c\/h4\u003e\n\u003cp\u003eA: The BCD8421 encoding supports up to 16 positions (0–9 and A–F in hexadecimal), though the exact number of active positions may vary. Please refer to your product images and datasheet for the specific gear count of your variant.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use these switches for DIY and hobbyist electronics projects?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely! These mini rotary encoder switches are very popular among electronics hobbyists, Arduino\/Raspberry Pi makers, and PCB prototype builders. Their small size and reliable BCD output make them easy to integrate into a wide variety of DIY projects.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is a BCD8421 rotary encoder switch used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A BCD8421 rotary encoder switch outputs a Binary Coded Decimal (BCD) signal using the 8421 weighting scheme. It is commonly used in digital electronics, microcontroller interfaces, PLC systems, and circuit boards where a specific numeric or gear position needs to be encoded and read as a binary signal.\"}}, {\"@type\": \"Question\", \"name\": \"Is this switch compatible with SMD PCB assembly?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! This rotary encoder band switch is designed as a Surface Mount Device (SMD), making it fully compatible with SMD PCB layouts. Its compact footprint is ideal for modern board designs where through-hole components are not preferred.\"}}, {\"@type\": \"Question\", \"name\": \"How many positions does the multi-gear band knob switch have?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The BCD8421 encoding supports up to 16 positions (0–9 and A–F in hexadecimal), though the exact number of active positions may vary. Please refer to your product images and datasheet for the specific gear count of your variant.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use these switches for DIY and hobbyist electronics projects?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Absolutely! These mini rotary encoder switches are very popular among electronics hobbyists, Arduino\/Raspberry Pi makers, and PCB prototype builders. Their small size and reliable BCD output make them easy to integrate into a wide variety of DIY projects.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/vd0uzy-jp.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"DIY \u0026 Maker Boards\", \"item\": \"https:\/\/vd0uzy-jp.myshopify.com\/collections\/diy-maker-boards\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Mini BCD8421 Rotary Encoder Band Knob SMD Switch – 2 Pack\", \"item\": \"https:\/\/vd0uzy-jp.myshopify.com\/products\/mini-bcd8421-rotary-encoder-band-knob-smd-switch-2-pack\"}]}\u003c\/script\u003e","brand":"Peaceful Pleasures Health and Wellness","offers":[{"title":"A4","offer_id":53651451773241,"sku":"1005011849198821-A4","price":3.73,"currency_code":"USD","in_stock":true},{"title":"A3","offer_id":53651451806009,"sku":"1005011849198821-A3","price":3.73,"currency_code":"USD","in_stock":true},{"title":"A6","offer_id":53651451838777,"sku":"1005011849198821-A6","price":3.73,"currency_code":"USD","in_stock":true},{"title":"A5","offer_id":53651451871545,"sku":"1005011849198821-A5","price":3.73,"currency_code":"USD","in_stock":true},{"title":"A2","offer_id":53651451904313,"sku":"1005011849198821-A2","price":3.73,"currency_code":"USD","in_stock":true},{"title":"A1","offer_id":53651451937081,"sku":"1005011849198821-A1","price":3.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/3689\/5801\/files\/S2ca3b0280e92426e8d5a38632e00c9282.webp?v=1782746026","url":"https:\/\/peacefulpleasureswellness.com\/products\/mini-bcd8421-rotary-encoder-band-knob-smd-switch-2-pack","provider":"Peaceful Pleasures Health and Wellness","version":"1.0","type":"link"}