{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4991LDX/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4991LDX-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM4991LDX-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM4991LDX%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Boomer® series, LM4991LDX/NOPB, Class AB audio power amplifier, 1-Channel (Mono), 3W x 1 @ 3Ohm max output, 2.2V ~ 5.5V supply, -40°C ~ 85°C, 8-WDFN Exposed Pad / 8-WSON (4x4) package, Surface Mount, Bulk.","salesMarkdown":"## 3W into 3Ω — what that means for the BOM The 3W rating into 3Ω is the maximum output power at 1% THD+N typical for this Class AB stage. The supply voltage directly sets the available swing: at 5V you get the full 3W; at 3.3V output drops proportionally. ## Active production — no LTB risk The LM4991LDX/NOPB carries an Active product status per the manufacturer. That means no last-time-buy window, no end-of-life notice pending. For a BOM line that needs a proven audio amp with industrial temperature range, this part is safe to qualify into new production. The NOPB suffix confirms lead-free / RoHS-compliant finish — no separate Pb-free conversion needed. ## Package and mounting — 8-WSON with exposed pad The package has an exposed pad on the bottom. That pad must be soldered to a PCB thermal land and connected to the ground plane for heat dissipation.","metaTitle":"LM4991LDX/NOPB Boomer® Class AB Audio Amp, 3W Mono, 8-WSON","metaDescription":"LM4991LDX/NOPB is a TI Boomer® Class AB audio power amplifier delivering 3W into 3Ω mono. Active production, industrial temp range -40°C to 85°C.","metaKeywords":null},"attributes":{"series":"Boomer®","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Type":"Class AB","Series":"Boomer®","Package":"Bulk","Features":"Depop, Shutdown, Thermal Protection","Output Type":"1-Channel (Mono)","Mounting Type":"Surface Mount","Package / Case":"8-WDFN Exposed Pad","lifecycle_stage":"eol_hot","Voltage - Supply":"2.2V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"8-WSON (4x4)","Max Output Power x Channels @ Load":"3W x 1 @ 3Ohm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.71","stockQuantity":0,"priceTiers":[{"qty":422,"price":"$0.71000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a13f401e6c32481a80ab1014371b62e6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is LM4991LDX/NOPB equivalent to LM4991MTX?","answer":"The LM4991MTX is a different package variant (TSSOP) of the same amplifier core. The LDX/NOPB is in an 8-WSON package. They are electrically equivalent but not pin-compatible — the package footprint differs."},{"question":"What is the pinout of LM4991LDX/NOPB?","answer":"The pinout is standard for the Boomer® mono amplifier family: pins include shutdown, bypass, input, output, and supply/ground. Refer to the datasheet for the exact pin mapping for the 8-WSON package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4991LDX-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4991LDX-NOPB 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}}