{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74F21D","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74F21D","canonicalUrl":"https://icboms.com/texas-instruments/SN74F21D","factsUrl":"https://icboms.com/api/mcp/products/SN74F21D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74F series AND Gate, SN74F21D, 14-SOIC (0.154\", 3.90mm Width), 2 circuits, 4 inputs, 5.1ns propagation delay.","salesMarkdown":"## Dual 4-input AND gate in the 74F family The SN74F21D is a dual 4-input AND gate from Texas Instruments' 74F series, a high-speed logic family that sits between the original 74LS and the later 74AC/ACT in the TTL logic evolution. It packages two independent AND gates, each with four inputs, in a single 14-SOIC package. The 5.1 ns maximum propagation delay at 5 V with a 50 pF load means this gate toggles at roughly 100 MHz in a typical board-level interconnect — fast enough for glue logic in 8- and 16-bit microprocessor systems, but not for the multi-GHz clock trees of modern SoCs. ## Output drive and logic thresholds The output can source 1 mA and sink 20 mA — the asymmetric drive is typical of TTL totem-pole outputs. The sink capability is enough to drive a standard TTL input fan-out of 10, or a low-power LED indicator through a series resistor. The high-side sourcing limit is the constraint: driving a 50 Ω transmission line requires an external pull-up or a buffer. Input logic thresholds are 0.8 V for low and 2 V for high, matching the standard TTL interface. A 3.3 V CMOS output driving this gate's input needs a pull-up to 5 V to guarantee the 2 V high threshold is met — the 74F input does not recognise 3.3 V as a valid high without level translation. Quiescent supply current is 4.3 mA maximum — negligible in a mixed-signal board but worth noting if the gate is on a power-rail that also feeds an analog front-end. ## Package and board-fit A standard SOIC-14 land pattern works; the 0.154\" width is the narrow-body variant, so the 0.300\" wide SOIC-14 footprint does not fit. The supplier device package is also 14-SOIC, confirming the same mechanical outline. For reflow assembly, the tube-to-reel transfer is a standard service; confirm the tube count at RFQ if you need a specific reel quantity. This is a mature, stable part that will remain available through standard distribution for the foreseeable future.","metaTitle":"SN74F21D Texas Instruments 74F AND Gate, 14-SOIC, 5.1ns","metaDescription":"SN74F21D dual 4-input AND gate in 14-SOIC. 5.1ns propagation delay at 5V, 50pF. Active production, ROHS3 compliant. Sourced to order.","metaKeywords":null},"attributes":{"series":"74F","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Series":"74F","Package":"Tube","Logic Type":"AND Gate","Mounting Type":"Surface Mount","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Number of Inputs":"4","Voltage - Supply":"4.5V ~ 5.5V","Number of Circuits":"2","Operating Temperature":"0°C ~ 70°C","Input Logic Level - Low":"0.8V","Supplier Device Package":"14-SOIC","Input Logic Level - High":"2V","Current - Quiescent (Max)":"4.3 mA","Current - Output High, Low":"1mA, 20mA","Max Propagation Delay @ V, Max CL":"5.1ns @ 5V, 50pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.22","priceTiers":[{"qty":1,"price":"$1.22000","currency":"USD"},{"qty":10,"price":"$1.09400","currency":"USD"},{"qty":25,"price":"$1.03880","currency":"USD"},{"qty":100,"price":"$0.85330","currency":"USD"},{"qty":250,"price":"$0.79764","currency":"USD"},{"qty":500,"price":"$0.70490","currency":"USD"},{"qty":1000,"price":"$0.55650","currency":"USD"},{"qty":2500,"price":"$0.52500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/ae947c1ab55f13e23d88695eec616f88.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74F21D/alternatives.json"},"ai":{"faq":[{"question":"What is the propagation delay of the SN74F21D?","answer":"The maximum propagation delay is 5.1 ns at 5 V supply with a 50 pF load. This is the time from any input crossing the threshold to the output reaching the valid logic level — the figure that sets the maximum clock rate for the logic path this gate is in."},{"question":"Can I hand-solder the SN74F21D?","answer":"No thermal pad or exposed paddle means no special reflow profile is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74F21D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74F21D 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}}