{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CD74HCT4046AE","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CD74HCT4046AE","canonicalUrl":"https://icboms.com/texas-instruments/CD74HCT4046AE","factsUrl":"https://icboms.com/api/mcp/products/CD74HCT4046AE","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HCT CD74HCT4046AE, Phase-Locked Loop (PLL) with VCO, CMOS I/O, 38 MHz max, 4.5-5.5 V supply, 1 circuit, 1:4 input:output ratio, -55 to 125°C, 16-DIP (0.300\", 7.62 mm), through-hole, tube.","salesMarkdown":"## What this PLL brings to the board The Texas Instruments CD74HCT4046AE is a Phase-Locked Loop (PLL) with an integrated VCO, built on the 74HCT logic family with CMOS-compatible inputs and outputs. It operates from a 4.5 V to 5.5 V supply, making it a direct fit for 5 V TTL/CMOS systems. The single-circuit device provides a 1:4 input-to-output ratio and supports a maximum frequency of 38 MHz. Packaged in a 16-pin PDIP (0.300\" wide, 7.62 mm pitch) for through-hole mounting, it is suited for frequency synthesis, clock recovery, and motor-speed control in industrial, telecom, and instrumentation applications where a wide temperature range is required. ## 38 MHz ceiling and what it means for the loop The 38 MHz maximum frequency sets the upper bound for the VCO and phase-detector operation. In a typical frequency-multiplier loop, the input reference must stay well below this limit to leave margin for the VCO's capture range and lock time. For designs clocking a microcontroller or FPGA from a lower-frequency crystal, this part can multiply a 1–10 MHz reference up to the 38 MHz ceiling without external dividers. If your target output exceeds 38 MHz, you need a faster PLL — this one will not lock. ## Military temperature grade: deployment envelope Rated for -55°C to 125°C operating temperature, the CD74HCT4046AE qualifies for avionics, satellite, downhole drilling, and military ground-vehicle electronics. The 74HCT family maintains CMOS noise margins across this range, but the VCO centre frequency and phase-detector gain will shift with temperature — budget for a wider lock range in the loop filter design. At 125°C junction, leakage currents increase; the loop filter capacitor should use X7R or C0G dielectric to avoid capacitance derating. ## Lifecycle and sourcing reality Texas Instruments lists the CD74HCT4046AE as Active and ROHS3 compliant. There is no announced end-of-life or last-time-buy window, so the part can be specified into new production without near-term obsolescence risk. For dual-sourcing flexibility, the CD74HCT7046AE is a pin-compatible variant — same 38 MHz max, same temperature range — but with a 1:2 input-to-output ratio and a different phase-detector architecture, so verify loop stability before substituting.","metaTitle":"CD74HCT4046AE PLL IC, 38 MHz, 16-PDIP, -55 to 125°C","metaDescription":"CD74HCT4046AE Phase-Locked Loop with VCO, 38 MHz max frequency, 4.5-5.5 V supply, through-hole 16-PDIP. RFQ for current pricing.","metaKeywords":null},"attributes":{"series":"74HCT","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Clock & Timing ICs"],"specifications":{"PLL":"Yes","Type":"Phase Lock Loop (PLL)","Input":"CMOS","Output":"CMOS","Series":"74HCT","Package":"Tube","Mounting Type":"Through Hole","Package / Case":"16-DIP (0.300\\\", 7.62mm)","Frequency - Max":"38MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Divider/Multiplier":"No/No","Number of Circuits":"1","Ratio - Input:Output":"1:4","Operating Temperature":"-55°C ~ 125°C","Supplier Device Package":"16-PDIP","Differential - Input:Output":"No/No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.77","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.77000","currency":"USD"},{"qty":10,"price":"$0.67900","currency":"USD"},{"qty":25,"price":"$0.63760","currency":"USD"},{"qty":100,"price":"$0.52030","currency":"USD"},{"qty":250,"price":"$0.48324","currency":"USD"},{"qty":500,"price":"$0.41128","currency":"USD"},{"qty":1000,"price":"$0.32902","currency":"USD"},{"qty":2500,"price":"$0.29818","currency":"USD"},{"qty":5000,"price":"$0.29100","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6a11f662d0c048466d8cd73d30c0d38c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum operating frequency of CD74HCT4046AE?","answer":"The CD74HCT4046AE has a maximum operating frequency of 38 MHz. This is the upper limit for the VCO and phase detector; the input reference frequency should be lower to maintain reliable lock."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CD74HCT4046AE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CD74HCT4046AE when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T10:39:33.080Z","lastPublished":"2026-07-16T10:39:33.080Z","indexable":true}}