{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74ALS251N","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74ALS251N","canonicalUrl":"https://icboms.com/texas-instruments/SN74ALS251N","factsUrl":"https://icboms.com/api/mcp/products/SN74ALS251N","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74ALS series multiplexer, SN74ALS251N, 1 x 8:1 circuit, 4.5V-5.5V supply, 2.6mA/24mA output drive, 16-DIP (0.300\", 7.62mm) through-hole package, tube.","salesMarkdown":"## 1 x 8:1 multiplexer in 16-pin DIP The SN74ALS251N is a single 8:1 multiplexer from Texas Instruments' 74ALS family, packaged in a 16-pin plastic DIP (0.300\" width) for through-hole assembly. It selects one of eight data inputs based on a three-bit address and presents it at the output, with a tristate output enable for bus-oriented applications. The commercial temperature range (0°C to 70°C) suits indoor equipment and benchtop instrumentation. ## Output drive and signal integrity The 24 mA low-level output current (IOL) is the figure that governs the fan-out and bus drive capability. At VOL = 0.5 V max, the output can sink 24 mA into a terminated line or multiple LSTTL loads without exceeding the DC noise margin. The 2.6 mA high-level output (IOH) at VOH = 2.7 V min is typical for ALS logic — adequate for driving CMOS inputs with a pull-up but not intended for 50 Ω backplane termination. The tristate output enable (active-low) allows the multiplexer to share a data bus with other outputs. When disabled, the output enters a high-impedance state, preventing bus contention. The propagation delay from address to output is typically 12 ns at 5 V, 25°C — fast enough for 8 MHz address-multiplexed buses in legacy 8-bit processor systems. The device is ROHS3 compliant, meeting the EU RoHS exemption-free requirements for lead-free assembly. No REACH or UL certification is documented in the available records.","metaTitle":"SN74ALS251N 74ALS 8:1 Multiplexer, 16-PDIP","metaDescription":"Texas Instruments SN74ALS251N 1 x 8:1 multiplexer, 4.5V-5.5V supply, 2.6mA/24mA output drive, 16-PDIP. Active production, ROHS3 compliant. Quoted to order.","metaKeywords":null},"attributes":{"series":"74ALS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Type":"Multiplexer","Series":"74ALS","Circuit":"1 x 8:1","Package":"Tube","Mounting Type":"Through Hole","Package / Case":"16-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Independent Circuits":"1","Operating Temperature":"0°C ~ 70°C","Voltage Supply Source":"Single Supply","Supplier Device Package":"16-PDIP","Current - Output High, Low":"2.6mA, 24mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.71","priceTiers":[{"qty":1,"price":"$1.71000","currency":"USD"},{"qty":10,"price":"$1.53400","currency":"USD"},{"qty":25,"price":"$1.44680","currency":"USD"},{"qty":100,"price":"$1.23280","currency":"USD"},{"qty":250,"price":"$1.15752","currency":"USD"},{"qty":500,"price":"$1.01284","currency":"USD"},{"qty":1000,"price":"$0.83920","currency":"USD"},{"qty":2500,"price":"$0.81900","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/8ac974c5239069eaeea1607e1508c31c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74ALS251N/alternatives.json"},"ai":{"faq":[{"question":"What is the output drive capability of the SN74ALS251N?","answer":"The SN74ALS251N provides 2.6 mA source current (IOH) and 24 mA sink current (IOL) at the output. The 24 mA sink capability is the key figure for driving bus lines or multiple LSTTL loads."},{"question":"What compliance documentation does Texas Instruments provide for the SN74ALS251N?","answer":"Texas Instruments certifies the SN74ALS251N as ROHS3 compliant. No REACH or UL documentation is listed in the available records for this part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74ALS251N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74ALS251N 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}}