{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74HC640PW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74HC640PW","canonicalUrl":"https://icboms.com/texas-instruments/SN74HC640PW","factsUrl":"https://icboms.com/api/mcp/products/SN74HC640PW","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HC series SN74HC640PW, 8-bit inverting bus transceiver with 3-state outputs, 2V to 6V supply, 7.8mA drive, -40°C to 85°C, 20-TSSOP.","salesMarkdown":"## 8-bit inverting bus transceiver for 2V–6V rails The inverting logic means data on the A bus appears inverted on the B bus, which is useful for polarity inversion in control signals or for matching a legacy bus protocol that expects inverted data. ## Supply range and logic-level compatibility At 3.3V VCC, the HC family's input thresholds (typically 0.7×VCC for VIH, 0.3×VCC for VIL) are compatible with 3.3V logic outputs from a Cortex-M or FPGA. At 5V, it interfaces directly with legacy 5V TTL or CMOS peripherals. The 7.8mA output drive per pin (both high and low) is typical for 74HC — enough to drive a handful of CMOS inputs or a low-current LED, but not a high-fan-out bus like a backplane. For a 32mA drive variant, the 74ABT2245 non-inverting transceiver is a different tier. The 20-TSSOP package (4.40mm body width) saves board area compared to a 20-SOIC, but the fine pitch (0.65mm) means the PCB fab needs a 0.3mm trace/space capability for routing. No LTB risk for ongoing production. The 74HC series is a mature logic family with broad second-sourcing (TI, Nexperia, ON Semiconductor all make 74HC640 variants), so supply continuity is strong. For a dual-sourcing strategy, any 74HC640 in a 20-TSSOP package from a major vendor is a drop-in substitute — verify the pin 1 orientation mark, but the JEDEC standard footprint is identical.","metaTitle":"SN74HC640PW 74HC Transceiver, Inverting 3-State, 2V–6V","metaDescription":"Texas Instruments SN74HC640PW 8-bit inverting bus transceiver with 3-state outputs. 2V to 6V supply range, -40°C to 85°C, 20-TSSOP. Active lifecycle, ROHS3.","metaKeywords":null},"attributes":{"series":"74HC","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"74HC","Package":"Tube","Logic Type":"Transceiver, Inverting","Output Type":"3-State","Mounting Type":"Surface Mount","Package / Case":"20-TSSOP (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2V ~ 6V","Number of Elements":"1","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"20-TSSOP","Current - Output High, Low":"7.8mA, 7.8mA","Number of Bits per Element":"8"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.84","priceTiers":[{"qty":1,"price":"$1.84000","currency":"USD"},{"qty":10,"price":"$1.64900","currency":"USD"},{"qty":25,"price":"$1.55560","currency":"USD"},{"qty":100,"price":"$1.32530","currency":"USD"},{"qty":250,"price":"$1.24444","currency":"USD"},{"qty":500,"price":"$1.08888","currency":"USD"},{"qty":1000,"price":"$0.90222","currency":"USD"},{"qty":2500,"price":"$0.88050","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/fc8f1d12579fb929977bc27a06d01632.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74HC640PW/alternatives.json"},"ai":{"faq":[{"question":"Is SN74HC640PW compatible with 3.3V logic?","answer":"Yes. The 2V to 6V supply range covers 3.3V operation. At 3.3V VCC, the HC input thresholds (VIH ~2.3V, VIL ~1.0V) are directly compatible with 3.3V CMOS outputs. No level translator is needed when connecting to a 3.3V MCU or FPGA."},{"question":"Is SN74HC640PW lead-free?","answer":"Yes, it is ROHS3 compliant, meaning it meets the EU RoHS directive without any of the exempted substances."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74HC640PW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74HC640PW 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}}