{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2931BZ50","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM2931BZ50","canonicalUrl":"https://icboms.com/stmicroelectronics/LM2931BZ50","factsUrl":"https://icboms.com/api/mcp/products/LM2931BZ50","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM2931BZ50, 5V fixed output LDO, 100mA, 0.6V dropout, 75dB PSRR at 120Hz, -40°C to 125°C, TO-92-3 through-hole package.","salesMarkdown":"## 5V fixed LDO in a TO-92-3 — what the scorch mark tells you The STMicroelectronics LM2931BZ50 is a 5V fixed-output low-dropout regulator in a TO-92-3 through-hole package, rated for 100 mA continuous output. It delivers a clean 5V rail with a dropout voltage of 0.6 V at full load and PSRR of 75 dB at 120 Hz, which makes it a solid choice for powering analog front-ends or microcontroller rails in noisy industrial environments. ## Dropout and PSRR — sizing the input rail The 0.6 V dropout at 100 mA means the input must stay above 5.6 V to maintain regulation. If the pre-regulator rail sags under load, the output drops out of spec — a common failure signature on boards where a 5 V rail is fed from a 6 V or 7 V supply that dips during a transient. The 75 dB PSRR at 120 Hz knocks down line-frequency ripple by a factor of about 5600, which is enough to keep a 100 mVpp input ripple from reaching the output as more than a few tens of microvolts. ## Temperature range and protection — where it survives Built-in over-current and over-temperature protection means a shorted load or a stalled fan won't instantly kill the regulator — it folds back or shuts down, and the board comes back when the fault clears. The LM2931BZ50 is listed as obsolete.","metaTitle":"LM2931BZ50 5V Fixed LDO Regulator, TO-92-3, 100mA, Obsolete","metaDescription":"LM2931BZ50 5V fixed output LDO, 100mA, 0.6V dropout, 75dB PSRR at 120Hz, -40°C to 125°C. TO-92-3 through-hole.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"75dB (120Hz)","Series":"-","Package":"Bulk","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-226-3, TO-92-3 (TO-226AA)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"100mA","Base Product Number":"LM2931","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Input (Max)":"26V","Voltage Dropout (Max)":"0.6V @ 100mA","Current - Supply (Max)":"30 mA","Voltage - Output (Max)":"-","Supplier Device Package":"TO-92-3","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d36d329ebe07b2117d1cff0e49ac76c9.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM2931BZ50","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM2931BZ50 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T18:51:46.635Z","lastPublished":"2026-07-16T18:51:46.635Z","indexable":true}}