{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4947TLX/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4947TLX-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM4947TLX-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM4947TLX%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4947TLX/NOPB, Boomer® Series, Class D Audio Amplifier, 25-WFBGA package, 2.7V ~ 5.5V supply, -40°C ~ 85°C, 1.19W mono + 87mW stereo headphone output, I²C/SPI volume control.","salesMarkdown":"## Class D audio amp with digital volume control — what this part does Volume control is handled digitally over I²C or SPI, which means the gain is set in the digital domain — no analog pot, no wiper noise, and the setting survives a mute/unmute cycle. The part also includes a 3D enhancement, depop circuitry to suppress startup clicks, and thermal protection. ## Output power split — why the mono and headphone ratings matter The 1.19W mono channel at 8Ω is sized for a small speaker in a portable dock or handheld device — think a Bluetooth speaker or a toy. The 87mW stereo headphone output at 32Ω covers standard consumer headphones. If your design only needs a speaker, the headphone outputs can be left floating; if you need more headphone power, this part is not the right fit — look at a dedicated headphone amp instead. ## I²C and SPI volume control — what it buys you Digital volume control over I²C or SPI means the host microcontroller sets the gain in discrete steps, with no external potentiometer or variable resistor. The mute and shutdown functions are also bus-controlled, so the system can cut audio instantly without a separate GPIO. The depop feature ramps the output on startup to avoid the thump that otherwise hits the speaker — important for battery-powered devices where the amp is turned on and off frequently to save power. The Class D architecture keeps efficiency high, so heat dissipation is low even at full output, which helps in sealed enclosures. There is no official second-source or pin-compatible replacement listed; if you need an alternative, the closest functional match would be another Boomer® series Class D amp with I²C/SPI volume control, but verify the package and output power ratings against your BOM.","metaTitle":"LM4947TLX/NOPB Class D Audio Amp, Boomer® Series, 25-WFBGA","metaDescription":"TI LM4947TLX/NOPB Class D audio amplifier with I²C/SPI volume control, 1.19W mono + 87mW stereo headphone output, 2.7-5.5V supply, -40 to 85°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":"Boomer®","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"Class D","Series":"Boomer®","Package":"Bulk","Features":"3D, Depop, Differential Inputs, I²C, Mute, Shutdown, SPI, Thermal Protection, Volume Control","Output Type":"1-Channel (Mono) with Stereo Headphones","Mounting Type":"Surface Mount","Package / Case":"25-WFBGA","lifecycle_stage":"eol_hot","Voltage - Supply":"2.7V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"25-uSMD","Max Output Power x Channels @ Load":"1.19W x 1 @ 8Ohm; 87mW x 2 @ 32Ohm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.26","priceTiers":[{"qty":239,"price":"$1.26000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a9ccada8f83be57f10829679282ee973.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4947TLX%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Does LM4947TLX/NOPB support I²C volume control?","answer":"Yes, the LM4947TLX/NOPB supports both I²C and SPI for digital volume control, mute, shutdown, and 3D enhancement. No external potentiometer is needed."},{"question":"What is the difference between LM4947TLX/NOPB and LM4947TLX?","answer":"The LM4947TLX/NOPB suffix indicates ROHS3 compliance (lead-free). The LM4947TLX without the /NOPB suffix may not carry the same ROHS3 rating. Functionally and electrically they are identical — the /NOPB version is the preferred environmental-compliant variant."},{"question":"Can LM4947TLX/NOPB drive 4 ohm loads?","answer":"The datasheet specifies output power at 8Ω for the mono channel and 32Ω for the headphone outputs. Driving a 4Ω speaker load is not covered in the listed ratings; the part may deliver higher current but thermal limits and distortion should be verified against the full datasheet. For a guaranteed 4Ω rating, look at a different Class D part specified for that load."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4947TLX-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/LM4947TLX-NOPB 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}}