{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT3042IDD#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT3042IDD~4PBF","canonicalUrl":"https://icboms.com/analog-devices/LT3042IDD~4PBF","factsUrl":"https://icboms.com/api/mcp/products/LT3042IDD%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LT3042IDD#PBF adjustable LDO regulator, 200 mA output, 20 V max input, 117 dB PSRR at 120 Hz, 10-DFN (3x3) exposed pad, -40°C to 125°C, tube.","salesMarkdown":"## 200 mA LDO with 117 dB PSRR — the noise floor for precision analog rails The LT3042IDD#PBF is an adjustable positive LDO regulator from Analog Devices, delivering up to 200 mA with a maximum input voltage of 20 V. Its headline feature is a PSRR that starts at 117 dB at 120 Hz and rolls off to 56 dB at 10 MHz — this means it rejects power-supply ripple and switching noise across the audio band into the low-MHz range, making it a fit for powering VCOs, ADC reference buffers, and sensitive analog front-ends where a clean rail directly determines signal-to-noise ratio. The adjustable output range from 0 V to 15 V lets it serve both low-voltage digital cores and higher-voltage analog supplies from a single regulator type, though the 200 mA ceiling limits it to lower-current branches of the power tree. Maximum dropout voltage is 0.35 V at 200 mA load (typical). Built-in over-temperature and reverse-polarity protection reduce the need for external clamping diodes on the input, saving board space in dense layouts. The current-limit, enable, and power-good control features allow sequencing — the enable pin can be driven by a supervisor IC to hold the output off until the upstream rail is stable, and the power-good flag signals the downstream load that the output is within regulation. The 10-DFN (3x3 mm) package with exposed pad requires a thermal via array under the pad to conduct heat into the PCB ground plane. For a 200 mA load at 5 V input and 3.3 V output, the power dissipation is 0.34 W — the θJA for this package with proper board layout is typically around 50°C/W, so the junction stays well below the 125°C absolute maximum even at 85°C ambient, but a layout without thermal vias will push the junction temperature above the derating curve. ## Active lifecycle and compliance — no end-of-life pressure The junction temperature must not exceed 125°C even during fault conditions — the thermal protection circuit shuts down the regulator at approximately 165°C, but repeated cycling near that threshold degrades reliability.","metaTitle":"LT3042IDD#PBF LDO Regulator, 200 mA, 20 V, 10-DFN","metaDescription":"Analog Devices LT3042IDD#PBF adjustable LDO, 200 mA output, 117 dB PSRR at 120 Hz, 20 V max input, 10-DFN (3x3) exposed pad, -40 to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"117dB ~ 56dB (120Hz ~ 10MHz)","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"10-WFDFN Exposed Pad","lifecycle_stage":"eol_hot","Control Features":"Current Limit, Enable, Power Good","Current - Output":"200mA","Protection Features":"Over Temperature, Reverse Polarity","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"20V","Voltage Dropout (Max)":"0.35V @ 200mA (Typ)","Voltage - Output (Max)":"15V","Supplier Device Package":"10-DFN (3x3)","Voltage - Output (Min/Fixed)":"0V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.62","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$7.62000","currency":"USD"},{"qty":10,"price":"$6.88300","currency":"USD"},{"qty":25,"price":"$6.56240","currency":"USD"},{"qty":100,"price":"$5.69810","currency":"USD"},{"qty":250,"price":"$5.44204","currency":"USD"},{"qty":500,"price":"$4.96186","currency":"USD"},{"qty":1000,"price":"$4.53000","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is LT3042IDD#PBF's PSRR and why does it matter?","answer":"The PSRR is 117 dB at 120 Hz, rolling off to 56 dB at 10 MHz. This means the regulator attenuates low-frequency ripple by a factor of 700,000× and still rejects switching noise above 1 MHz by a factor of 600× — critical for powering ADC reference buffers, PLL VCOs, and precision analog front-ends where power-supply noise directly degrades the signal-to-noise ratio."},{"question":"Will LT3042IDD#PBF drop into a board designed for LT3042HMSE#PBF without rewiring?","answer":"Yes — the LT3042IDD#PBF and LT3042HMSE#PBF share the same pinout, output current (200 mA), input voltage (20 V max), and PSRR profile. If the board's thermal environment stays below 125°C junction, the IDD part is a drop-in replacement with no layout change."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT3042IDD~4PBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LT3042IDD~4PBF 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}}