{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT1117IST-5#TRPBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT1117IST-5TRPBF","canonicalUrl":"https://icboms.com/analog-devices/LT1117IST-5TRPBF","factsUrl":"https://icboms.com/api/mcp/products/LT1117IST-5%23TRPBF","rawCanonicalId":null},"summary":{"shortDescription":"Linear Technology LT1117IST-5#TRPBF, 5V fixed-output positive LDO regulator, 800mA, 75dB PSRR at 120Hz, 1.3V dropout max at full load, -40°C to 125°C, SOT-223-3 package, ROHS3 compliant.","salesMarkdown":"## Package and mounting The LT1117IST-5#TRPBF is a Linear Technology fixed 5 V output positive LDO regulator rated for 800 mA continuous output current. The 75 dB PSRR at 120 Hz tells you this part is tuned for cleaning up rectified mains ripple — think post-bridge-rectifier rails in a 50/60 Hz supply, not a switching regulator's MHz hash. The maximum dropout voltage of 1.3 V at 800 mA means you need at least 6.3 V on the input to hold regulation at full load; at lighter loads the dropout is lower, but the 1.3 V ceiling is the number to budget for in worst-case line sag. ## SOT-223-3 — hand-solderable, no hot-air station required The SOT-223-3 package is a rework-friendly footprint. Three visible pins plus a large tab on the bottom — the tab is the output (Vout) and also the main thermal path. On a site visit with just a temperature-controlled iron and some flux, you can swap this part in under a minute. No hot-air station, no preheater. Just tack the tab first, then the pins. The tab is the same node as pin 2 (output), so if you accidentally short the tab to the ground plane you have a dead short — keep the copper pour under the tab connected to Vout, not ground. The package is rated for surface-mount reflow, but for a field repair the iron method works fine as long as you pre-tin the pad and the tab. ## Dropout and quiescent — sizing the input rail and the battery budget Maximum dropout is 1.3 V at 800 mA output. That means a 5 V rail needs at least 6.3 V input to stay in regulation at full load. If your input is a 12 V bus, that is fine — you have plenty of headroom. If you are running from a 6 V battery that sags to 5.8 V under load, this part will drop out and the output will follow the input minus the dropout voltage. The quiescent current is 10 mA — not a micropower part. For a battery-powered sensor node that sleeps most of the time, the 10 mA Iq will drain the cell faster than a low-Iq LDO. This part is better suited to always-on rails in line-powered equipment where the 10 mA is negligible. The ROHS3 compliance means the solder finish is lead-free per the latest EU directive — no exemption paperwork, no special handling for export.","metaTitle":"LT1117IST-5#TRPBF LDO Regulator, 5V Fixed 800mA SOT-223-3","metaDescription":"LT1117IST-5#TRPBF 5V fixed output LDO, 800mA, 75dB PSRR at 120Hz, -40°C to 125°C, SOT-223-3, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"PSRR":"75dB (120Hz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","lifecycle_stage":"eol_hot","Current - Output":"800mA","Protection Features":"Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"15V","Voltage Dropout (Max)":"1.3V @ 800mA","Supplier Device Package":"SOT-223-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.39","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.39000","currency":"USD"},{"qty":10,"price":"$5.77600","currency":"USD"},{"qty":25,"price":"$5.50760","currency":"USD"},{"qty":100,"price":"$4.78210","currency":"USD"},{"qty":250,"price":"$4.56720","currency":"USD"},{"qty":500,"price":"$4.16424","currency":"USD"},{"qty":1000,"price":"$3.62691","currency":"USD"},{"qty":2000,"price":"$3.49258","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/1117fd.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can I use LT1117IST-5#TRPBF as a replacement for LT1117-5 fixed regulator?","answer":"The LT1117IST-5#TRPBF is a specific tape-and-reel variant of the LT1117-5 fixed regulator in the SOT-223 package. The electrical specs (5 V fixed output, 800 mA, 1.3 V dropout max) are the same as the standard LT1117-5. The only difference is the packaging and reel format — functionally it is a drop-in replacement for any LT1117-5 in SOT-223."},{"question":"Is LT1117IST-5#TRPBF RoHS compliant?","answer":"Yes, it is ROHS3 compliant — fully lead-free with no exemptions. Suitable for RoHS-regulated markets without additional paperwork."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT1117IST-5TRPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LT1117IST-5TRPBF 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}}