{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CD4021BPW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CD4021BPW","canonicalUrl":"https://icboms.com/texas-instruments/CD4021BPW","factsUrl":"https://icboms.com/api/mcp/products/CD4021BPW","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments CD4021BPW, Series 4000B, 8-Stage Static Shift Register, Parallel or Serial to Serial, Push-Pull Output, 3V to 18V Supply, -55°C to 125°C, 16-TSSOP Package, Tube.","salesMarkdown":"## What this 8-stage shift register does on your board The CD4021BPW is a 4000B-series 8-stage static shift register that accepts parallel or serial input and delivers serial output with push-pull drive. It operates across a 3V to 18V supply range, making it a direct drop-in for legacy 5V, 12V, or 15V logic buses without extra level translation. The single-element, 8-bit architecture captures eight parallel inputs and shifts them out on a single serial line — a common way to expand digital inputs on a microcontroller or read a bank of panel switches over a twisted pair. ## Temperature range and where it survives Rated for -55°C to 125°C, this part handles environments that kill commercial-grade logic: engine-bay electronics, outdoor telecom cabinets in direct sun, downhole instrumentation, and satellite payloads. The wide temperature grade also means it holds timing over the full range — no speed derating surprises when the panel heats up. ## Package reality — TSSOP vs DIP The 16-TSSOP body (4.40 mm wide) is the surface-mount variant. If your BOM expects a through-hole DIP, the DIP sibling shares the same function, supply range, and temperature grade but uses a different footprint. ## Lifecycle and sourcing posture No last-time-buy clock ticking — this part is still a valid choice for new designs that need a wide-supply parallel-to-serial buffer.","metaTitle":"CD4021BPW 4000B 8-Stage Shift Register, 3V-18V, -55 to 125°C","metaDescription":"CD4021BPW 4000B 8-stage parallel-to-serial shift register. 3V-18V supply, -55°C to 125°C, 16-TSSOP. Active production.","metaKeywords":null},"attributes":{"series":"4000B","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"4000B","Package":"Tube","Function":"Parallel or Serial to Serial","Logic Type":"Shift Register","Output Type":"Push-Pull","Mounting Type":"Surface Mount","Package / Case":"16-TSSOP (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3V ~ 18V","Number of Elements":"1","Operating Temperature":"-55°C ~ 125°C","Supplier Device Package":"16-TSSOP","Number of Bits per Element":"8"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.34","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.34000","currency":"USD"},{"qty":10,"price":"$1.19800","currency":"USD"},{"qty":25,"price":"$1.13680","currency":"USD"},{"qty":100,"price":"$0.93380","currency":"USD"},{"qty":250,"price":"$0.87284","currency":"USD"},{"qty":500,"price":"$0.77136","currency":"USD"},{"qty":1000,"price":"$0.60897","currency":"USD"},{"qty":2500,"price":"$0.57450","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/704ed694f34c786246e0bd5232122f29.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between CD4021BPW and CD4021BE?","answer":"The CD4021BPW is the surface-mount 16-TSSOP variant; the CD4021BE is the through-hole 16-DIP variant. Both share the same 4000B logic family, 8-stage shift register function, 3V-18V supply range, and -55°C to 125°C temperature grade. The choice is purely footprint — SMT vs through-hole."},{"question":"Can CD4021BPW be used for parallel to serial conversion?","answer":"Yes — that is its primary function. The CD4021BPW accepts eight parallel inputs and shifts them out serially on a single output line, controlled by a clock and a parallel/serial select pin. It is commonly used to read multiple switches or digital sensors over a few microcontroller pins."},{"question":"Is CD4021BPW surface mount or through-hole?","answer":"Surface mount. The package is 16-TSSOP (4.40 mm wide), supplier device package 16-TSSOP. It is not a through-hole part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CD4021BPW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CD4021BPW when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-13T19:55:13.406Z","lastPublished":"2026-07-13T19:55:13.406Z","indexable":true}}