{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LD39150PT-R","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LD39150PT-R","canonicalUrl":"https://icboms.com/stmicroelectronics/LD39150PT-R","factsUrl":"https://icboms.com/api/mcp/products/LD39150PT-R","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LD39150PT-R adjustable LDO voltage regulator, 1.5 A output, 0.4 V dropout max, PSRR 65-55 dB (120 Hz-1 kHz), TO-252-5 PPAK, -40 to +125 °C.","salesMarkdown":"## 1.5 A adjustable LDO for post-regulation rails The LD39150PT-R is a positive adjustable LDO regulator from STMicroelectronics, delivering up to 1.5 A continuous output with a maximum dropout voltage of 0.4 V at full load — meaning the input rail needs to stay at least 400 mV above the programmed output voltage to maintain regulation. The output is adjustable from a 1.22 V reference up to 5 V, set by an external resistor divider. A single regulator in a TO-252-5 PPAK package, it is suited for point-of-load post-regulation where a clean, low-noise rail is needed downstream of a switching converter. ## PSRR profile and noise rejection across frequency Power supply rejection ratio is specified at 65 dB at 120 Hz, dropping to 55 dB at 1 kHz — this tells you the regulator attenuates 120 Hz ripple from a full-wave rectifier by a factor of ~1800, but at 1 kHz the attenuation drops to ~560. Upstream switching noise above a few kilohertz will pass through with less rejection, so a pre-filter or a second-stage LC filter ahead of this LDO is worth considering if the switching frequency is in the 100 kHz+ range. ## Thermal and protection features for industrial duty Operating junction temperature range is -40 to +125 °C, covering industrial and automotive under-hood environments. The PPAK package's exposed pad must be soldered to a sufficient copper area on the PCB to keep the junction below the thermal shutdown threshold at 1.5 A output. Built-in over-current and over-temperature protection means the regulator folds back or shuts down under fault conditions without external protection diodes — the load is protected and the regulator survives a sustained short on the output. Quiescent current is 2.5 mA typical — modest for a 1.5 A LDO, but worth budgeting in always-on or battery-backed rails where every milliamp of overhead matters.","metaTitle":"STMicroelectronics LD39150PT-R LDO, 1.5A Adj, PPAK","metaDescription":"ST LD39150PT-R adjustable LDO regulator, 1.5 A output, 0.4 V dropout at full load, PSRR 65-55 dB (120 Hz-1 kHz), -40 to +125 °C, PPAK. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"65dB ~ 55dB (120Hz ~ 1kHz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-252-5, DPak (4 Leads + Tab), TO-252AD","lifecycle_stage":"eol_hot","Current - Output":"1.5A","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Input (Max)":"6V","Voltage Dropout (Max)":"0.4V @ 1.5A","Voltage - Output (Max)":"5V","Supplier Device Package":"PPAK","Current - Quiescent (Iq)":"2.5 mA","Voltage - Output (Min/Fixed)":"1.22V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.53","priceTiers":[{"qty":1,"price":"$1.53000","currency":"USD"},{"qty":10,"price":"$1.37200","currency":"USD"},{"qty":25,"price":"$1.30160","currency":"USD"},{"qty":100,"price":"$1.06930","currency":"USD"},{"qty":250,"price":"$0.99956","currency":"USD"},{"qty":500,"price":"$0.88334","currency":"USD"},{"qty":1000,"price":"$0.76755","currency":"USD"},{"qty":2500,"price":"$0.76755","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/377c41224ded12674f88b087f672b35a.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LD39150PT-R/alternatives.json"},"ai":{"faq":[{"question":"What does the PSRR spec of 65 dB ~ 55 dB (120 Hz ~ 1 kHz) mean for my design?","answer":"It means the LDO attenuates 120 Hz mains ripple by about 1800× (65 dB), but at 1 kHz the rejection drops to about 560× (55 dB). If your upstream switcher runs at 100 kHz or higher, expect significantly less attenuation — a second LC filter ahead of the LDO may be needed to keep switching noise out of the output rail."},{"question":"What package does the LD39150PT-R come in?","answer":"It is supplied in a TO-252-5 (DPak with 4 leads plus tab) surface-mount package, also designated PPAK by ST. Available in Tape & Reel or Cut Tape options."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LD39150PT-R","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LD39150PT-R when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}