[{"data":1,"prerenderedAt":175},["ShallowReactive",2],{"component:ams1117-3-3:en":3},{"component":4,"localizationFallbackIssues":151,"related":152,"equivalentSlugs":174},{"schemaVersion":5,"governance":6,"id":18,"mpn":19,"slug":18,"primaryCategory":20,"manufacturers":21,"lifecycleStatus":24,"shortDescription":25,"deepTechnicalOverview":26,"packages":27,"absoluteMaximums":57,"recommendedOperating":63,"parametricAttributes":66,"gotchas":103,"datasheetUrl":17,"documentationSources":118,"applicationCircuits":124,"equivalents":125,"mountedOnBoards":131,"seo":142},"1.0.0",{"publication":7,"verification":10,"provenance":15},{"status":8,"publishedDate":9},"published","2026-10-10",{"status":11,"verifiedDate":9,"verifiedBy":12,"checklist":13},"verified","Serhii Shvab (owner sign-off of review pack batch 1, prepared by Claude against the cited datasheets)",{"schema":14,"technicalFacts":14,"relationships":14,"sources":14},true,{"sourceUrls":16},[17],"http:\u002F\u002Fwww.advanced-monolithic.com\u002Fpdf\u002Fds1117.pdf","ams1117-3-3","AMS1117-3.3","voltage_regulator",[22,23],"Advanced Monolithic Systems","Various","active","1A low-dropout positive linear voltage regulator with fixed 3.3V output in SOT-223 package.","The AMS1117-3.3 is a fixed 3.3 V low-dropout linear regulator from Advanced Monolithic Systems, common on development boards such as NodeMCU and the STM32 Blue Pill. It delivers up to 1 A, with dropout of 1.1 V typical and 1.3 V maximum at 0.8 A (higher above 0.8 A), an on-chip trimmed reference, and protection against short circuit and thermal overload. The facts on this page come from the AMS datasheet; boards often carry compatible 1117 parts from other vendors whose limits and capacitor requirements can differ.",[28],{"packageType":29,"pinCount":30,"bodyDimensionsMm":31,"pitchMm":35,"thermalResistanceThetaJA":36,"pins":37},"SOT-223",4,{"length":32,"width":33,"height":34},6.5,3.5,1.8,2.3,90,[38,44,49,54],{"pinNumber":39,"pinName":40,"electricalType":41,"isFiveVoltTolerant":14,"internalPull":42,"description":43},1,"GND\u002FADJ","ground","none","Ground for fixed version, or adjust feedback node",{"pinNumber":45,"pinName":46,"electricalType":47,"isFiveVoltTolerant":14,"internalPull":42,"description":48},2,"VOUT","power_out","Regulated 3.3V output (electrically connected to tab)",{"pinNumber":50,"pinName":51,"electricalType":52,"isFiveVoltTolerant":14,"internalPull":42,"description":53},3,"VIN","power_in","Unregulated input voltage (15 V absolute maximum; at least 4.75 V for regulation)",{"pinNumber":30,"pinName":55,"electricalType":47,"isFiveVoltTolerant":14,"internalPull":42,"description":56},"VOUT (TAB)","Large thermal tab, connected to VOUT",{"inputVoltageMaxV":58,"outputCurrentMaxA":39,"operatingTempMinC":59,"operatingTempMaxC":60,"storageTempMinC":61,"storageTempMaxC":62},15,-40,125,-65,150,{"supplyVoltageMinV":64,"supplyVoltageTypV":65},4.75,5,[67,72,78,83,87,92,98],{"symbol":68,"name":69,"typicalValue":70,"unit":71},"V_out","Output Voltage",3.3,"V",{"symbol":73,"name":74,"typicalValue":75,"maxValue":76,"unit":71,"testCondition":77},"V_drop","Dropout Voltage",1.1,1.3,"IOUT = 0.8 A; higher above 0.8 A",{"symbol":79,"name":80,"typicalValue":81,"unit":82},"I_out","Max Output Current",1000,"mA",{"symbol":84,"name":85,"typicalValue":65,"maxValue":86,"unit":82},"I_q","Quiescent Current",11,{"symbol":88,"name":89,"typicalValue":65,"maxValue":90,"unit":82,"testCondition":91},"I_load_min","Minimum Load Current",10,"(VIN − VOUT) = 1.5 V; regulation guaranteed above 10 mA",{"symbol":93,"name":94,"typicalValue":95,"unit":96,"testCondition":97},"P_reg","Regulation Guaranteed Up To",1.2,"W","SOT-223; absolute maximum dissipation is internally limited",{"symbol":99,"name":100,"typicalValue":101,"maxValue":58,"unit":71,"testCondition":102},"V_in_max","Input Voltage (VIN − VOUT ≤ 12 V for specified regulation)","4.75 (test condition)","15 V is the absolute maximum",[104,109,114],{"title":105,"severity":106,"description":107,"mitigationStrategy":108},"Output Capacitor Is Required for Stability","critical","The regulator relies on its output capacitor for frequency compensation. AMS documents 22 µF solid tantalum on the output as stable for all operating conditions; without a bypass capacitor on ADJ, smaller capacitors also work. Some 1117 parts from other vendors specify a capacitor ESR window, so very low-ESR ceramics alone can oscillate on those.","Use 22 µF solid tantalum on VOUT (and 10 µF on VIN), or follow the capacitor requirements of the exact vendor part on your board.",{"title":110,"severity":111,"description":112,"mitigationStrategy":113},"Thermal Tab Is VOUT, Not GND","warning","The SOT-223 tab is connected to the output (pin 2). Tying the tab to a ground copper pour shorts the 3.3 V rail.","Assign the copper under the tab to the 3.3 V net, not to the ground plane.",{"title":115,"severity":111,"description":116,"mitigationStrategy":117},"Minimum Load of 10 mA","Regulation is guaranteed only when the output current exceeds 10 mA. With no load the output can rise above 3.3 V.","Make sure the circuit draws at least 10 mA, or add a bleeder resistor (about 330 Ω at 3.3 V) when the load can be absent.",[119],{"title":120,"url":17,"type":121,"authority":122,"publisher":22,"language":123},"AMS1117 1A Low Dropout Voltage Regulator Datasheet","datasheet","primary","EN",[],[126],{"equivalentMpn":127,"manufacturer":128,"compatibilityType":129,"parameterDifferences":130},"LM1117-3.3","Texas Instruments","pin_to_pin_drop_in","Same SOT-223 pin order (ADJ\u002FGND, VOUT, VIN). Check the LM1117 datasheet for its regulation figures and output-capacitor requirements.",[132,137],{"boardSlug":133,"boardName":134,"designator":135,"roleOnBoard":136},"nodemcu-v2-cp2102","NodeMCU V2","U2","3.3V Wi-Fi Power Regulator",{"boardSlug":138,"boardName":139,"designator":140,"roleOnBoard":141},"stm32f103c8t6-blue-pill","STM32 Blue Pill","U1","3.3V Core Regulator",{"canonicalUrl":143,"metaTitle":144,"metaDescription":145,"primarySearchCluster":146,"structuredDataSchema":150},"https:\u002F\u002Fcircuitbase.tech\u002Fcomponent\u002Fams1117-3-3","AMS1117-3.3 Pinout, SOT-223 Datasheet & Capacitor Guide | CircuitBase","AMS1117-3.3 LDO pinout (SOT-223), tab = VOUT, dropout at 0.8 A, 10 mA minimum load and output capacitor requirements, from the AMS datasheet.",[147,148,149],"ams1117 3.3 pinout","ams1117 sot-223 datasheet","ams1117 capacitor schematic","Product",null,[153],{"id":154,"slug":154,"mpn":155,"primaryCategory":156,"manufacturers":157,"shortDescription":161,"packages":162,"packageTypes":168,"voltage":169,"recommendedOperating":173},"ne555","NE555P","timer_driver",[128,158,159,160],"STMicroelectronics","onsemi","Diodes Incorporated","Industry-standard precision bipolar timer IC for astable multivibrators, monostable pulse generation, and PWM controllers.",[163,166],{"packageType":164,"pinCount":165},"DIP-8",8,{"packageType":167,"pinCount":165},"SOIC-8",[164,167],{"context":170,"min":171,"max":172,"typical":65},"supply",4.5,16,{"supplyVoltageMinV":171,"supplyVoltageTypV":65,"supplyVoltageMaxV":172},{},1791718235875]