{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT317AT#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT317AT~4PBF","canonicalUrl":"https://icboms.com/analog-devices/LT317AT~4PBF","factsUrl":"https://icboms.com/api/mcp/products/LT317AT%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Linear Technology LT317AT#PBF positive adjustable linear voltage regulator, 1.5A output, 40V input max, TO-220-3 through-hole package, tube.","salesMarkdown":"## 1.5 A adjustable LDO — 40 V input ceiling, TO-220-3 The LT317AT#PBF is a positive adjustable linear regulator delivering up to 1.5 A from a 40 V maximum input rail, with the output set anywhere from 1.25 V up to 40 V via two external resistors. Housed in a TO-220-3 through-hole package, it mounts into a standard TO-220 footprint on the board — the tab is the output pin, so the heatsink pad connects to the load, not ground. ## PSRR 80 dB to 65 dB at 120 Hz — ripple rejection across the line-frequency band Power-supply rejection ratio is specified at 80 dB typical at 120 Hz, rolling off to 65 dB at the same frequency — this covers the full-wave-rectified ripple from a 60 Hz mains input, meaning the regulator attenuates the 120 Hz hum by a factor of 10,000 at the low end. For a 1 Vpp ripple on the input rail, the output sees roughly 100 µVpp at 120 Hz — clean enough to feed an analog front-end without additional post-filtering. ## Over-temperature protection — the only built-in safeguard The sole protection feature listed is over-temperature shutdown — the die shuts the pass element off when the junction exceeds the thermal limit, then re-enables after cooling. There is no built-in current limit or reverse-polarity protection, so the external circuit should handle those conditions if the application demands them.","metaTitle":"LT317AT#PBF Positive Adjustable LDO, 1.5A, TO-220-3","metaDescription":"LT317AT#PBF positive adjustable LDO, 1.5A output, 40V max input, PSRR 80dB~65dB at 120Hz. Active, RoHS3 compliant. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"80dB ~ 65dB (120Hz)","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-220-3","lifecycle_stage":"eol_hot","Current - Output":"1.5A","Protection Features":"Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C ~ 125°C","Voltage - Input (Max)":"40V","Voltage - Output (Max)":"40V","Supplier Device Package":"TO-220-3","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.76","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.76000","currency":"USD"},{"qty":10,"price":"$6.10800","currency":"USD"},{"qty":25,"price":"$5.82360","currency":"USD"},{"qty":100,"price":"$5.05660","currency":"USD"},{"qty":250,"price":"$4.82936","currency":"USD"},{"qty":500,"price":"$4.40324","currency":"USD"},{"qty":1000,"price":"$4.02000","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the PSRR of LT317AT#PBF at 120 Hz?","answer":"The power-supply rejection ratio is 80 dB typical at 120 Hz, rolling to 65 dB — this attenuates the full-wave-rectified ripple from a 60 Hz mains input by a factor of 10,000 at the low end."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT317AT~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/LT317AT~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}}