{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317BT","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM317BT","canonicalUrl":"https://icboms.com/stmicroelectronics/LM317BT","factsUrl":"https://icboms.com/api/mcp/products/LM317BT","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM317BT, adjustable positive linear regulator, 1.5 A output, TO-220-3 through-hole package, industrial temperature range -40°C to 125°C.","salesMarkdown":"## Adjustable 1.5 A regulator — TO-220 package The output voltage is set by two external resistors from 1.2 V up to 37 V, with a maximum input of 40 V. PSRR is specified at 80 dB to 65 dB at 120 Hz — the 80 dB floor at line frequency means the part can suppress mains ripple by a factor of 10,000, which is useful for powering sensitive analog loads from a rectified supply. Built-in protection includes over-current, over-temperature, and short-circuit — the regulator folds back current and shuts down thermally before the die exceeds safe junction temperature. ## Industrial temperature grade and thermal derating In the TO-220 package, the 1.5 A rating is achievable only with adequate heatsinking. Without a heatsink, the junction-to-ambient thermal resistance limits practical continuous current to roughly 0.5 A at 25°C ambient — plan the copper area or clip-on heatsink accordingly. Quiescent current is 10 mA typical — this is the ground pin current that flows regardless of load, so budget it in the supply rail for low-power designs. Availability and pricing vary by date code and quantity — confirm current stock and lead time at quote time.","metaTitle":"LM317BT STMicroelectronics Adjustable Linear Regulator 1.5A","metaDescription":"LM317BT from STMicroelectronics — adjustable positive regulator, 1.5 A output, TO-220 package, industrial temp -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1.5A","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-220","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.2V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6900","priceTiers":[{"qty":1,"price":"$0.69000","currency":"USD"},{"qty":10,"price":"$0.60500","currency":"USD"},{"qty":25,"price":"$0.56840","currency":"USD"},{"qty":100,"price":"$0.46380","currency":"USD"},{"qty":250,"price":"$0.43080","currency":"USD"},{"qty":500,"price":"$0.36664","currency":"USD"},{"qty":1000,"price":"$0.29330","currency":"USD"},{"qty":2500,"price":"$0.26581","currency":"USD"},{"qty":5000,"price":"$0.24748","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/babfa8fd7c14be235df0f227841adf0f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317BT/alternatives.json"},"ai":{"faq":[{"question":"How can I order the LM317BT or check stock?","answer":"The LM317BT is obsolete from STMicroelectronics. We source it through independent distribution against your BOM quantity."},{"question":"Is the LM317BT a direct replacement for the LM317T?","answer":"The LM317BT shares the same base product number LM317 and the same TO-220 package, so it is functionally identical to the LM317T. The suffix 'BT' may indicate a specific date-code or factory-origin variant — confirm the marking code against your BOM's approved supplier list before committing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM317BT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM317BT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T17:44:06.811Z","lastPublished":"2026-07-17T17:44:06.811Z","indexable":true}}