{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CD74HC191E","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CD74HC191E","canonicalUrl":"https://icboms.com/texas-instruments/CD74HC191E","factsUrl":"https://icboms.com/api/mcp/products/CD74HC191E","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HC series binary counter, CD74HC191E, 4-bit synchronous up/down, 35 MHz count rate, through-hole 16-DIP (0.300\", 7.62mm), -55 to 125°C operating temperature.","salesMarkdown":"## 4-bit synchronous binary counter with up/down direction The CD74HC191E is a 4-bit synchronous binary counter from the 74HC high-speed CMOS logic family, capable of counting up or down at rates up to 35 MHz. It clocks on the positive edge and includes an asynchronous reset that forces all outputs low independently of the clock state. ## Count rate and reset behavior for timing applications With a maximum count rate of 35 MHz, this counter suits frequency division, event counting, or state-machine sequencing where the input clock runs at moderate speeds. The synchronous timing means all four bits change on the same clock edge, avoiding ripple skew that accumulates in asynchronous counters. The asynchronous reset (active low on the /CLR pin) clears the counter without waiting for a clock edge — useful for power-up initialization or emergency reset in safety-critical logic paths. Because it bypasses the clock, the reset pulse width must meet the minimum specified in the datasheet to guarantee all flip-flops clear. ## Supply range and temperature grade for board-level integration Housed in a 16-pin DIP (0.300-inch row spacing), the through-hole package is breadboard-friendly and survives manual rework. The 7.62 mm body width fits standard 0.300-inch DIP sockets; the 2.54 mm pin pitch matches prototyping grids. ## Production status and compliance for BOM planning ROHS3 compliance (lead-free and exempt-free per EU 2015/863) means it ships without restricted substances — no additional exemption documentation is needed for most commercial and industrial assemblies. The 74HC family is widely second-sourced; pin-compatible equivalents from other manufacturers exist, though the exact AC/DC characteristics may differ slightly.","metaTitle":"CD74HC191E 4-bit binary counter, 35 MHz, DIP-16, TI","metaDescription":"Texas Instruments CD74HC191E 4-bit synchronous up/down binary counter, 35 MHz count rate, -55 to 125°C, 16-PDIP. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"74HC","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Reset":"Asynchronous","Series":"74HC","Timing":"Synchronous","Package":"Tube","Direction":"Up, Down","Count Rate":"35 MHz","Logic Type":"Binary Counter","Trigger Type":"Positive Edge","Mounting Type":"Through Hole","Package / Case":"16-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Voltage - Supply":"2 V ~ 6 V","Number of Elements":"1","Operating Temperature":"-55°C ~ 125°C","Supplier Device Package":"16-PDIP","Number of Bits per Element":"4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.92","priceTiers":[{"qty":1,"price":"$0.92000","currency":"USD"},{"qty":10,"price":"$0.82200","currency":"USD"},{"qty":25,"price":"$0.78040","currency":"USD"},{"qty":100,"price":"$0.64110","currency":"USD"},{"qty":250,"price":"$0.59932","currency":"USD"},{"qty":500,"price":"$0.52964","currency":"USD"},{"qty":1000,"price":"$0.41814","currency":"USD"},{"qty":2500,"price":"$0.39026","currency":"USD"},{"qty":5000,"price":"$0.37075","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6a92d01cf1f3a94a3873890a88b04e4f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CD74HC191E/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to CD74HC191E?","answer":"The CD74HC191E is a standard 74HC logic function. Pin-compatible equivalents from other 74HC logic suppliers (Nexperia, ON Semiconductor, STMicroelectronics) exist with the same 16-pin DIP footprint. Verify the specific AC/DC thresholds and timing from each manufacturer's datasheet before substituting on an existing board."},{"question":"What compliance documentation does Texas Instruments provide for CD74HC191E?","answer":"Texas Instruments provides ROHS3 compliance certification for the CD74HC191E. Standard documentation includes the datasheet, material declaration, and environmental compliance report available through TI's document portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CD74HC191E","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CD74HC191E 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}}