{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TPS7A0331PDQNR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TPS7A0331PDQNR","canonicalUrl":"https://icboms.com/texas-instruments/TPS7A0331PDQNR","factsUrl":"https://icboms.com/api/mcp/products/TPS7A0331PDQNR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TPS7A0331PDQNR LDO voltage regulator, fixed 3.1 V output, 200 mA, 55 dB PSRR (1 kHz), 300 nA quiescent, 4-X2SON (1x1 mm) package.","salesMarkdown":"## Why the 55 dB PSRR matters on this rail The TPS7A0331PDQNR is a 200 mA LDO with a fixed 3.1 V output, but the spec that decides whether it cleans up a noisy supply rail is the 55 dB power-supply rejection ratio at 1 kHz. That means ripple on the input — from a switching regulator or a digital bus — is attenuated by a factor of roughly 560 before it reaches the load. For an analog front-end or a sensor bias rail where 1 mV of ripple corrupts a 12-bit reading, this matters more than the dropout voltage. ## 300 nA quiescent — what it buys on a battery Quiescent current is 300 nA typical. On a 100 mAh coin cell powering a sensor that wakes once a minute, the LDO's own draw is negligible — the battery's self-discharge rate dominates the shelf life. The Enable pin lets a microcontroller gate the output entirely, dropping Iq to near zero between measurement cycles. Dropout voltage is 0.36 V max at the full 200 mA load. If the input rail is a 3.3 V bus with 5% tolerance, the minimum input at 3.135 V still leaves 35 mV of headroom above the 3.1 V output — tight but within spec. Below that margin the output falls out of regulation. Protection features include over-current, over-temperature, and under-voltage lockout (UVLO). The UVLO threshold prevents the output from sourcing current into a shorted input rail — a common failure mode on boards where the LDO's input capacitor holds charge after the upstream supply collapses. ## Package and board-fit — 4-X2SON 1x1 mm The 4-X2SON package measures 1 mm x 1 mm with an exposed pad — the footprint is smaller than a 0402 resistor. The 4-XDFN Exposed Pad case requires a thermal via under the pad to pull heat into the board plane; without it the junction-to-ambient thermal resistance rises and the 125 °C max junction temperature is reached at a lower ambient. The supplier device package is listed as 4-X2SON (1x1), which is the same physical outline as the XDFN.","metaTitle":"TI TPS7A0331PDQNR LDO, 3.1V Fixed, 200mA, 55dB PSRR","metaDescription":"Texas Instruments TPS7A0331PDQNR LDO regulator, 3.1V fixed output, 200mA, 55dB PSRR at 1kHz, 300nA Iq. Active, ROHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"55dB (1kHz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"4-XDFN Exposed Pad","lifecycle_stage":"eol_hot","Control Features":"Enable","Current - Output":"200mA","Protection Features":"Over Current, Over Temperature, Under Voltage Lockout (UVLO)","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Input (Max)":"6V","Voltage Dropout (Max)":"0.36V @ 200mA","Supplier Device Package":"4-X2SON (1x1)","Current - Quiescent (Iq)":"300 nA","Voltage - Output (Min/Fixed)":"3.1V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.94","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.94000","currency":"USD"},{"qty":10,"price":"$0.83800","currency":"USD"},{"qty":25,"price":"$0.79560","currency":"USD"},{"qty":100,"price":"$0.65340","currency":"USD"},{"qty":250,"price":"$0.61076","currency":"USD"},{"qty":500,"price":"$0.53976","currency":"USD"},{"qty":1000,"price":"$0.42612","currency":"USD"},{"qty":3000,"price":"$0.40200","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/619f97c74ffd6e7d6600a49234e51e8d.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the PSRR of TPS7A0331PDQNR?","answer":"The power-supply rejection ratio is 55 dB at 1 kHz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TPS7A0331PDQNR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TPS7A0331PDQNR 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}}