{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317LD","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM317LD","canonicalUrl":"https://icboms.com/stmicroelectronics/LM317LD","factsUrl":"https://icboms.com/api/mcp/products/LM317LD","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM317LD, adjustable positive voltage regulator, 100 mA output, 1.2 V to 37 V output range, 40 V max input, PSRR 80 dB ~ 65 dB at 120 Hz, 8-SOIC surface-mount package, 0°C to 125°C operating temperature.","salesMarkdown":"## What this 8-SOIC LM317 variant brings to the board The LM317LD is the surface-mount SOIC-8 version of the classic three-terminal adjustable positive voltage regulator, delivering up to 100 mA output current with an input range up to 40 V and an adjustable output from 1.2 V to 37 V. Its PSRR of 80 dB to 65 dB at 120 Hz makes it a reasonable choice for post-filter regulation in analog supply rails where ripple rejection matters — think op-amp front-ends or low-noise sensor bias. The 8-SOIC footprint (0.154\" wide, 3.90 mm body width) is the key difference from the more common TO-220 LM317 variants — this part is meant for reflow assembly and space-constrained boards, not through-hole heatsink mounting. If your board is locked to this footprint, you will need to qualify an alternate regulator or plan a board spin. ## Protection features and thermal reality in SOIC-8 The regulator includes over-current, over-temperature, and short-circuit protection — standard for the LM317 family, but worth noting because the SOIC-8 package has higher thermal resistance than a TO-220, so the protection thresholds will engage at lower power dissipation.","metaTitle":"LM317LD adjustable linear regulator, 100 mA, 8-SOIC","metaDescription":"LM317LD positive adjustable regulator, 100 mA output, 1.2 V to 37 V range, PSRR 80 dB at 120 Hz.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Obsolete","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":"0°C~125°C","Voltage - Input (Max)":"40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"8-SOIC","Current - Quiescent (Iq)":"5 mA","Voltage - Output (Min/Fixed)":"1.2V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/75ec130e850034dd89547ca506646904.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317LD/alternatives.json"},"ai":{"faq":[{"question":"What is a direct replacement for LM317LD?","answer":"No official pin-compatible replacement is recorded for the LM317LD in the 8-SOIC package. You may need to evaluate a different adjustable regulator in SOIC-8 and qualify it for your board."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM317LD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM317LD 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}}