{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SNJ54390J","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SNJ54390J","canonicalUrl":"https://icboms.com/texas-instruments/SNJ54390J","factsUrl":"https://icboms.com/api/mcp/products/SNJ54390J","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SNJ54390J decade counter, asynchronous, DIP package, Bulk, active production.","salesMarkdown":"## What this counter does on the board The SNJ54390J is a decade counter — it counts input clock pulses from 0 through 9 and resets on the tenth pulse, delivering a BCD output at the Q pins. Asynchronous means the ripple carry propagates through the flip-flops one stage at a time, so the output settling time equals the sum of the propagation delays through all four stages. For a 5 V system clocking at a few megahertz the ripple delay is manageable; above 10 MHz the glitch on the count rollover becomes wide enough to clock downstream logic, and you either gate the output or switch to a synchronous counter. ## Lifecycle and BOM fit Texas Instruments lists the SNJ54390J as Active. The part is RoHS non-compliant — the lead finish on the DIP package exceeds the 1000 ppm threshold, so this part cannot be used in a product shipped into EU RoHS or China RoHS jurisdictions without an exemption. For a military or aerospace BOM that has a leaded-solder exemption, the non-compliance is irrelevant; for a commercial design it is a showstopper. ## Sourcing desk reality No pin-compatible second-source or cross-reference is recorded for this order code. For a BOM line that needs a guaranteed alternate, the only route is a board spin to a synchronous counter in a RoHS-compliant package.","metaTitle":"Texas Instruments SNJ54390J Decade Counter, Active","metaDescription":"Texas Instruments SNJ54390J decade counter, asynchronous. Active production, RoHS non-compliant. Sourced to order against RFQ through independent distribution.","metaKeywords":null},"attributes":{"series":"*","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"*","Package":"Bulk","lifecycle_stage":"eol_hot"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.08","stockQuantity":0,"priceTiers":[{"qty":74,"price":"$4.08000","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SNJ54390J","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SNJ54390J when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}