{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4938MHX","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4938MHX","canonicalUrl":"https://icboms.com/texas-instruments/LM4938MHX","factsUrl":"https://icboms.com/api/mcp/products/LM4938MHX","rawCanonicalId":null},"summary":{"shortDescription":"National Semiconductor LM4938MHX Boomer® Class AB, 2-Channel (Stereo) with Stereo Headphones, 2.2W x 2 @ 3Ohm, 2.7V ~ 5.5V, Surface Mount 28-TSSOP (0.173\", 4.40mm Width) Exposed Pad, -20°C ~ 85°C.","salesMarkdown":"The National Semiconductor LM4938MHX is a Boomer® series Class AB audio amplifier delivering 2.2W x 2 into a 3Ω load from a 5V supply. That 2.2W per channel figure is the headline rating that drives the speaker selection and the thermal design. The supply range of 2.7V to 5.5V means it runs comfortably from a single Li-ion cell or a 3.3V/5V regulated rail. The RoHS compliance flag shows non-compliant — if your BOM requires RoHS-10/10, this part will not clear that gate, so check your exemption or plan for a lead-free alternate. The 28-TSSOP with exposed pad (HTSSOP) helps pull heat out of the die; a layout without the pad soldered to a copper pour will derate the output power well below the 2.2W figure.","metaTitle":"LM4938MHX Class AB Audio Amp, 2.2W x 2 @ 3Ω, 28-HTSSOP","metaDescription":"National Semiconductor LM4938MHX Boomer® Class AB stereo audio amplifier. 2.2W per channel into 3Ω, 2.7V-5.5V supply, -20°C to 85°C. Active, RoHS non-compliant.","metaKeywords":null},"attributes":{"series":"Boomer®","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Type":"Class AB","Series":"Boomer®","Package":"Bulk","Output Type":"2-Channel (Stereo) with Stereo Headphones","Mounting Type":"Surface Mount","Package / Case":"28-TSSOP (0.173\\\", 4.40mm Width) Exposed Pad","lifecycle_stage":"eol_hot","Voltage - Supply":"2.7V ~ 5.5V","Operating Temperature":"-20°C ~ 85°C (TA)","Supplier Device Package":"28-HTSSOP","Max Output Power x Channels @ Load":"2.2W x 2 @ 3Ohm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.59","stockQuantity":0,"priceTiers":[{"qty":507,"price":"$0.59000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/360248abc3c600fac16fde9aa9d8664c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between LM4938MHX and LM4938MH?","answer":"The LM4938MHX is the tape-and-reel / bulk-packaged variant of the LM4938MH. The die and electrical specifications are identical — the suffix difference is purely a packaging and shipping format distinction. The LM4938MHX ships in bulk; the LM4938MH typically ships in tube. Both are the same 28-HTSSOP part."},{"question":"Does LM4938MHX require an external heatsink?","answer":"The 28-HTSSOP package includes an exposed pad that serves as the primary thermal path. With the pad properly soldered to a copper plane and a via stitch, the part can deliver 2.2W per channel without an add-on heatsink in typical indoor environments. Without that pad connection, output power must be derated significantly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4938MHX","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4938MHX when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}