{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317LZ/LFT3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317LZ-LFT3","canonicalUrl":"https://icboms.com/texas-instruments/LM317LZ-LFT3","factsUrl":"https://icboms.com/api/mcp/products/LM317LZ%2FLFT3","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM317LZ/LFT3 adjustable positive voltage regulator, 100 mA output, 40 V input max, 1.2 V to 37 V output range, PSRR 80 dB ~ 65 dB at 120 Hz, TO-92-3 through-hole package, -40 °C to 125 °C operating temperature.","salesMarkdown":"## 100 mA output — the BOM-fit ceiling The LM317LZ/LFT3 is an adjustable positive voltage regulator from the LM317 family, but with a 100 mA output current ceiling — one-tenth the 1.5 A of the standard LM317. That current rating is the first filter: this part fits low-power rails where the load never exceeds 100 mA, not the higher-current bench supply or motor-drive bias rail. The output adjusts from 1.2 V up to 37 V using two external resistors, and the single regulator handles positive rail regulation only. ## PSRR at 120 Hz — ripple rejection for analog rails Power-supply rejection ratio is specified at 80 dB to 65 dB at 120 Hz, which means the regulator attenuates full-wave-rectified ripple by a factor of roughly 10,000 to 1,800. That matters when this part feeds a sensitive analog circuit — an op-amp supply, a small-signal front-end — where 120 Hz hum on the rail would couple into the signal path. The PSRR rolls off with frequency, so at higher switching-regulator ripple the rejection is lower; plan the input filter accordingly. ## Through-hole TO-92-3 — board integration The TO-92-3 (TO-226AA) through-hole package is the classic three-lead transistor outline — compact, hand-solderable, and fits standard 0.1-inch pitch prototyping boards. The 5 mA quiescent current is drawn regardless of load, so in a battery-powered design that standby current eats into the run-time budget. Protection features — overcurrent, overtemperature, short-circuit — are built in, so no external clamp diodes or foldback circuits are needed for basic survivability.","metaTitle":"LM317LZ/LFT3 Adjustable Regulator, 100 mA, TO-92-3, Active","metaDescription":"LM317LZ/LFT3 adjustable positive voltage regulator, 100 mA output, 40 V input max, PSRR 80 dB ~ 65 dB at 120 Hz. TO-92-3 through-hole package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Cut Tape (CT); Tape & Box (TB)","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-226-3, TO-92-3 (TO-226AA)","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"100mA","Base Product Number":"LM317","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C~125°C","Voltage - Input (Max)":"40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"TO-92-3","Current - Quiescent (Iq)":"5 mA","Voltage - Output (Min/Fixed)":"1.2V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/6e1b4db1f31e3d4f44355e3bccdda90e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317LZ%2FLFT3/alternatives.json"},"ai":{"faq":[{"question":"Is the LM317LZ/LFT3 equivalent to the standard LM317?","answer":"Not in output current. The standard LM317 is rated for 1.5 A; the LM317LZ/LFT3 is limited to 100 mA. Pinout and adjustment mechanism are the same — both use two external resistors to set the output from 1.2 V to 37 V — but the current ceiling makes them non-interchangeable in any design that draws more than 100 mA."},{"question":"What is the output current of the LM317LZ/LFT3?","answer":"100 mA maximum continuous output current. That is the headline rating that defines this part versus the higher-current LM317 variants."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317LZ-LFT3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317LZ-LFT3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}