{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UA78L10ACPKG3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UA78L10ACPKG3","canonicalUrl":"https://icboms.com/texas-instruments/UA78L10ACPKG3","factsUrl":"https://icboms.com/api/mcp/products/UA78L10ACPKG3","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UA78L10ACPKG3 linear voltage regulator, fixed 10V output, 100mA, positive, SOT-89-3 surface-mount, 0°C to 125°C, ROHS3 compliant.","salesMarkdown":"## 10V fixed rail, 100mA ceiling — the headroom trap The UA78L10ACPKG3 is a fixed 10V positive linear regulator rated for 100mA continuous output. That 10V rail is set internally — no resistor divider, no trim pin. The input can go up to 25V, but the dropout is 1.7V max at 40mA, so the input needs to stay above roughly 11.7V to keep the output in regulation. If the input sags below that under load, the output follows it down. PSRR is 44dB at 120Hz — that's the full-wave rectifier ripple frequency. A 1V peak-to-peak ripple on the input gets knocked down to about 6.3mV on the output. Above 120Hz the rejection drops off, so a switching preregulator feeding this part needs its own output cap to keep the high-frequency hash out of the 10V rail. ## SOT-89-3 — the tab is the output, treat it that way The package is SOT-89-3 (also called TO-243AA), a three-lead surface-mount part with a large collector tab. The tab is the output pin (Vout), so the PCB copper area under the part is the primary heat path. For 100mA at 10V out from a 15V input, the regulator dissipates 0.5W — the SOT-89-3's thermal resistance to ambient is around 55°C/W with decent copper, so the junction stays under 100°C at 25°C ambient. No heatsink needed, but the pad should have a solid via cluster to an inner ground plane. The protection set includes over-current, over-temperature, reverse polarity, and short-circuit. Reverse polarity protection means a backwards battery on the input won't kill the regulator — the internal pass element blocks the reverse current. Short-circuit protection folds back the output current, so the part survives a hard short without immediate destruction. ## Active, ROHS3 — no compliance headache The 78L family has been around for decades, so the die and package are mature; a sudden EOL is unlikely but not impossible. Available in Tape & Reel (TR) for volume placement or Cut Tape (CT) for prototype and small-run builds. The reel quantity is typically 1000 or 2500 depending on the supplier's cut — confirm the reel count at quote time.","metaTitle":"UA78L10ACPKG3 Linear Regulator, 10V Fixed, 100mA, SOT-89-3","metaDescription":"Texas Instruments UA78L10ACPKG3 — 10V fixed-output linear regulator, 100mA, SOT-89-3. 44dB PSRR at 120Hz. Active, ROHS3 compliant. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"44dB (120Hz)","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-243AA","lifecycle_stage":"eol_hot","Current - Output":"100mA","Protection Features":"Over Current, Over Temperature, Reverse Polarity, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C ~ 125°C","Voltage - Input (Max)":"25V","Voltage Dropout (Max)":"1.7V @ 40mA","Supplier Device Package":"SOT-89-3","Voltage - Output (Min/Fixed)":"10V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.45","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.45000","currency":"USD"},{"qty":10,"price":"$0.39000","currency":"USD"},{"qty":25,"price":"$0.36360","currency":"USD"},{"qty":100,"price":"$0.29090","currency":"USD"},{"qty":250,"price":"$0.27008","currency":"USD"},{"qty":500,"price":"$0.22854","currency":"USD"},{"qty":1000,"price":"$0.17660","currency":"USD"},{"qty":2000,"price":"$0.16102","currency":"USD"},{"qty":5000,"price":"$0.15063","currency":"USD"},{"qty":10000,"price":"$0.14700","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b26fb6b3154644af043d061e11fc4f49.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How do I get current pricing and availability for UA78L10ACPKG3?","answer":"The UA78L10ACPKG3 is sourced through independent distribution."},{"question":"What compliance documentation does Texas Instruments provide?","answer":"The UA78L10ACPKG3 is ROHS3 compliant with no exemptions. Standard Texas Instruments compliance documentation (RoHS certificate, REACH declaration, material composition) is available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UA78L10ACPKG3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UA78L10ACPKG3 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}}