{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TPS78428QDBVRQ1","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TPS78428QDBVRQ1","canonicalUrl":"https://icboms.com/texas-instruments/TPS78428QDBVRQ1","factsUrl":"https://icboms.com/api/mcp/products/TPS78428QDBVRQ1","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TPS78428QDBVRQ1 automotive LDO, fixed 2.8V output, 300mA, 115mV dropout, 30µA quiescent current, SOT-23-5 package, AEC-Q100 qualified.","salesMarkdown":"## Automotive-grade LDO for noise-sensitive rails The TPS78428QDBVRQ1 is a fixed 2.8V output LDO from Texas Instruments, delivering 300mA continuous current in a SOT-23-5 package. The 115mV maximum dropout at 300mA full load means the input rail can dip to 2.915V before the output falls out of regulation — a tight headroom budget that matters when the LDO is fed from a pre-regulated 3.3V or 3.0V bus rather than a battery. ## PSRR profile and noise rejection PSRR starts at 60dB at 1kHz and rolls off to 30dB at 1MHz. This means the LDO effectively filters switching noise from a DC-DC converter upstream up to a few hundred kHz, but above ~300kHz the attenuation drops enough that a post-filter LC stage may be needed if the load is an analog sensor front-end or a precision ADC reference. The 30µA typical quiescent current (43µA max supply current) keeps the regulator's own draw low enough for always-on automotive modules that stay powered during key-off — the Iq is well below the 100µA threshold that would trigger a parasitic-load fault in most body-control ECUs. ## Protection and control for harsh environments Built-in over-current and over-temperature protection let the LDO survive a shorted output or a thermal runaway condition without external crowbar circuitry — the die simply folds back current and shuts down until the junction cools. The enable pin lets a supervisory circuit or a GPIO from the ECU hold the regulator off during startup sequencing, preventing the 2.8V rail from powering up before the 3.3V bus is stable.","metaTitle":"TPS78428QDBVRQ1 LDO 2.8V 300mA SOT-23-5 AEC-Q100","metaDescription":"Texas Instruments TPS78428QDBVRQ1 automotive LDO, fixed 2.8V output, 300mA, 115mV dropout, 30µA Iq, SOT-23-5. Active, ROHS3. Request a quote.","metaKeywords":null},"attributes":{"series":"Automotive, AEC-Q100","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"60dB ~ 30dB (1kHz ~ 1MHz)","Series":"Automotive, AEC-Q100","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"SC-74A, SOT-753","lifecycle_stage":"eol_hot","Control Features":"Enable","Current - Output":"300mA","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 150°C (TJ)","Voltage - Input (Max)":"6V","Voltage Dropout (Max)":"0.115V @ 300mA","Current - Supply (Max)":"43 µA","Supplier Device Package":"SOT-23-5","Current - Quiescent (Iq)":"30 µA","Voltage - Output (Min/Fixed)":"2.8V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.99","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.99000","currency":"USD"},{"qty":10,"price":"$0.86800","currency":"USD"},{"qty":25,"price":"$0.81480","currency":"USD"},{"qty":100,"price":"$0.66510","currency":"USD"},{"qty":250,"price":"$0.61776","currency":"USD"},{"qty":500,"price":"$0.52576","currency":"USD"},{"qty":1000,"price":"$0.42061","currency":"USD"},{"qty":3000,"price":"$0.38118","currency":"USD"},{"qty":6000,"price":"$0.37200","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/79bd7e0197759840bcc3119dd1d07f34.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the PSRR of the TPS78428QDBVRQ1?","answer":"The PSRR is 60dB at 1kHz, rolling off to 30dB at 1MHz. This means it provides strong ripple rejection from switching converters up to a few hundred kHz, but above that frequency a post-filter may be needed for noise-sensitive loads."},{"question":"How can I order the TPS78428QDBVRQ1 or check availability?","answer":"Submit an RFQ for current pricing, lead time, and lot traceability confirmation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TPS78428QDBVRQ1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TPS78428QDBVRQ1 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}}