{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CD40105BE","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CD40105BE","canonicalUrl":"https://icboms.com/texas-instruments/CD40105BE","factsUrl":"https://icboms.com/api/mcp/products/CD40105BE","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 4000B series FIFO memory, asynchronous, 64 (16 x 4) bit, through hole, 16-DIP (0.300\", 7.62mm) package, 3 V ~ 18 V supply, -55°C ~ 125°C.","salesMarkdown":"## What this FIFO does on your board The CD40105BE is a 64-bit asynchronous FIFO organized as 16 words by 4 bits — a shallow, narrow buffer for clock-domain crossing or rate-matching between a slow sensor bus and a faster processor port. The 16-DIP (0.300\", 7.62mm) through-hole package means it plugs into a standard 300-mil socket or solders into a plated through-hole board — no fine-pitch reflow, no BGA x-ray inspection. A technician can replace it in the field with a desoldering iron. ## Asynchronous operation and expandability Asynchronous FIFO means the read and write clocks are independent — no common clock tree needed. The CD40105BE handles data transfers between two unrelated clock domains, for example a 1 kHz temperature sensor reading into a 10 MHz acquisition controller, without metastability if the setup/hold timing is respected. Depth and width expansion are supported: cascade multiple devices to increase the word count or the bit width. A 16×4 block can become 32×4 by tying the full-flag outputs, or 16×8 by wiring two devices in parallel with common read/write controls — no external glue logic required beyond the flag gating. No FWFT (First-Word Fall-Through) support and no programmable flags — the flag architecture is fixed: the full flag goes high when the FIFO is full, the empty flag goes high when it is empty, and the half-full flag indicates the midpoint. For designs that need early-warning flags or a look-ahead data output, a different FIFO family (e.g., the 74ACT series) would be a better fit. RoHS3 compliant (ROHS3 Compliant per the TI lifecycle record). No REACH or UL documentation is on the record, but the RoHS declaration covers the EU material restriction requirements for most industrial and commercial applications.","metaTitle":"Texas Instruments CD40105BE FIFO, 64 (16x4), 16-DIP","metaDescription":"CD40105BE asynchronous FIFO, 64-bit (16x4) memory, 3V-18V supply, -55°C to 125°C, active production, RoHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":"4000B","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Series":"4000B","Package":"Tube","Function":"Asynchronous","Memory Size":"64 (16 x 4)","FWFT Support":"No","Mounting Type":"Through Hole","Expansion Type":"Depth, Width","Package / Case":"16-DIP (0.300\\\", 7.62mm)","Bus Directional":"Uni-Directional","lifecycle_stage":"eol_hot","Voltage - Supply":"3 V ~ 18 V","Operating Temperature":"-55°C ~ 125°C","Retransmit Capability":"No","Supplier Device Package":"16-PDIP","Programmable Flags Support":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.07","priceTiers":[{"qty":1,"price":"$1.07000","currency":"USD"},{"qty":10,"price":"$0.97200","currency":"USD"},{"qty":25,"price":"$0.95960","currency":"USD"},{"qty":50,"price":"$0.95380","currency":"USD"},{"qty":100,"price":"$0.85290","currency":"USD"},{"qty":250,"price":"$0.84564","currency":"USD"},{"qty":500,"price":"$0.83316","currency":"USD"},{"qty":1000,"price":"$0.80335","currency":"USD"},{"qty":5000,"price":"$0.73172","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0532ac8793fa2357c5e54170eab64101.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CD40105BE/alternatives.json"},"ai":{"faq":[{"question":"What is the memory organization of the CD40105BE?","answer":"The CD40105BE is a 64-bit FIFO organized as 16 words of 4 bits each — 16×4. It is asynchronous, with independent read and write clocks."},{"question":"Can I expand the CD40105BE to more words or wider data?","answer":"Yes, the device supports depth expansion (more words) and width expansion (more bits per word) by cascading multiple CD40105BE devices. No external logic is needed beyond flag-gating for depth expansion."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CD40105BE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CD40105BE when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}