[{"data":1,"prerenderedAt":637},["ShallowReactive",2],{"schematic:ne555-monostable-delay-timer:pt":3},{"schematic":4,"title":19,"shortDescription":22,"proseSource":595,"localizationFallbackIssues":596,"related":597,"confirmations":596},{"schemaVersion":5,"governance":6,"slug":18,"title":19,"cluster":20,"tier":21,"shortDescription":22,"deepTechnicalOverview":23,"theoryOfOperation":24,"keySpecifications":25,"applications":47,"gotchas":52,"formulas":71,"bom":105,"interactiveElements":148,"circuitJson":196,"svg":590,"relatedSchematicSlugs":591,"relatedComponentSlugs":593,"relatedBoardSlugs":594},"1.0",{"publication":7,"verification":10,"provenance":15},{"status":8,"publishedDate":9},"published","2026-10-23",{"status":11,"verifiedDate":9,"verifiedBy":12,"checklist":13},"verified","Claude (documentary review against TI SLFS022K Figure 6-2 and §5–§7; CAD redraw; LLM localization review; owner publication GO; no bench or native-human claim)",{"schema":14,"technicalFacts":14,"relationships":14,"sources":14},true,{"sourceUrls":16},[17],"https:\u002F\u002Fwww.ti.com\u002Flit\u002Fds\u002Fsymlink\u002Fne555.pdf","ne555-monostable-delay-timer","Temporizador monoestável de atraso com NE555 (one-shot)","timing_oscillators","Tier 1","O circuito de disparo único da folha de dados TI NE555: aperte START e a saída fica alta por um tempo fixo definido por um resistor e um capacitor, cerca de 1,1 s com 100 kΩ e 10 µF.","Esta é a figura 6-2 da folha de dados do temporizador 555 da Texas Instruments (SLFS022K), o modo monoestável, ou de disparo único. Um pulso baixo curto na entrada de disparo inicia um único pulso de saída cuja duração depende apenas de R1 e C1: tw = 1.1 × RA × C. Como os níveis de disparo e de limiar são frações fixas da alimentação, a duração do pulso não muda com a tensão de alimentação, desde que ela permaneça constante durante o pulso. A TI desenha apenas uma linha de entrada; aqui ela é acionada por um botão START com resistor de pull-up de 10 kΩ, e os valores RA = 100 kΩ e C = 10 µF dão um pulso de cerca de 1,1 s. Um capacitor de 10 nF no CONT e um desacoplamento de 100 nF na alimentação completam o circuito, este último conforme a recomendação da TI na seção de alimentação.","### 1. Estado de espera\nEntre os pulsos OUT (pino 3) fica em nível baixo e o transistor de descarga em DISCH (pino 7) conduz e mantém C1 perto de 0 V. R2 mantém TRIG (pino 2) em VCC. RESET (pino 4) está ligado ao VCC, porque um nível baixo em RESET tem prioridade sobre tudo.\n\n### 2. Disparo\nApertar START puxa TRIG abaixo do nível de disparo, um terço de VCC (1,67 V típicos com VCC = 5 V). O flip-flop interno é setado: OUT vai para nível alto e o transistor de descarga corta, então C1 pode carregar.\n\n### 3. Temporização\nC1 carrega através de R1 em direção ao VCC:\n$$V_C(t) = V_{CC}\\left(1 - e^{-t\u002F(R_A C)}\\right)$$\nO pulso termina quando V_C atinge o limiar de dois terços de VCC, o que acontece após ln 3 ≈ 1,1 constante de tempo:\n$$t_w = R_A C \\ln 3 \\approx 1.1 \\cdot R_A C = 1.1 \\cdot 100\\text{ k}\\Omega \\cdot 10\\,\\mu\\text{F} = 1.1\\text{ s}$$\nOs dois níveis são proporcionais ao VCC, então a duração do pulso não depende da tensão de alimentação enquanto ela for constante. A TI indica para este modo uma sensibilidade à alimentação de 0,1 %\u002FV típica.\n\n### 4. Fim do pulso\nNo limiar o flip-flop é resetado: OUT vai para nível baixo e o transistor de descarga conduz e esvazia C1, pronto para o próximo disparo. A TI observa que a sequência só termina se TRIG estiver em nível alto por pelo menos 10 µs antes do fim do intervalo; se START continuar apertado, OUT fica alto até ser solto.\n\n### 5. Saída\nOUT pode fornecer ou absorver até 200 mA, o suficiente para um LED com resistor em série, um relé pequeno com diodo de roda livre ou uma entrada lógica.",[26,29,32,35,38,41,44],{"label":27,"value":28},"Tensão de alimentação de operação","4,5 V – 16 V (TI §7.3)",{"label":30,"value":31},"Duração do pulso","tw = 1.1 × RA × C ≈ 1,1 s com 100 kΩ e 10 µF (calculado)",{"label":33,"value":34},"Nível de disparo","1\u002F3 VCC; 1,67 V típico com VCC = 5 V (TI §5.5)",{"label":36,"value":37},"Nível de limiar","2\u002F3 VCC; 3,3 V típico com VCC = 5 V (TI §5.5)",{"label":39,"value":40},"Sensibilidade da temporização à alimentação","0,1 %\u002FV típico, 0,5 %\u002FV máximo, monoestável (TI §5.6)",{"label":42,"value":43},"Coeficiente de temperatura da temporização","50 ppm\u002F°C típico, monoestável (TI §5.6)",{"label":45,"value":46},"Corrente de saída","±200 mA recomendado (TI §5.3)",[48,49,50,51],"Temporizadores de desligamento retardado para luzes e ventiladores","Debounce: um pulso limpo para cada toque no botão","Detecção de pulsos ausentes e de timeout","Pulsos de duração fixa para relés, buzzers e lógica",[53,58,62,67],{"title":54,"trap":55,"solution":56,"severity":57},"Segurar o botão alonga o pulso","O pulso só termina se TRIG estiver alto por pelo menos 10 µs antes do fim do intervalo. Se START for mantido apertado por mais tempo que tw, OUT fica alto até ser solto.","Mantenha o disparo mais curto que o pulso. Se a entrada puder ficar baixa por muito tempo, acople-a por um capacitor pequeno para que só a borda de descida chegue ao TRIG.","warning",{"title":59,"trap":60,"solution":61,"severity":57},"Fuga do eletrolítico com RA grande","Perto do limiar só entra em C1 (VCC − 2\u002F3 VCC)\u002FRA, cerca de 17 µA com 100 kΩ a 5 V (calculado). Um eletrolítico com muita fuga consome uma parte considerável dessa corrente, alonga o pulso e, com RA muito grande, pode nunca atingir o limiar.","Mantenha RA na faixa de 2 kΩ – 100 kΩ que a TI usa em suas especificações de temporização e aumente o tempo com C, usando um capacitor de baixa fuga; use capacitores de filme para pulsos curtos e precisos.",{"title":63,"trap":64,"solution":65,"severity":66},"Pino CONT flutuando","O CONT carrega o limiar interno. Se ficar aberto, o ruído acoplado desloca o limiar e a duração do pulso oscila.","Desacople o CONT para o terra com um capacitor pequeno (aqui 10 nF), como a TI desenha na figura 6-2.","info",{"title":68,"trap":69,"solution":70,"severity":66},"RESET desconectado","RESET é ativo em nível baixo e tem prioridade sobre o disparo. Flutuando, pode captar ruído e encerrar ou bloquear pulsos.","Ligue RESET ao VCC como no esquema, ou controle-o pela lógica se o pulso precisar ser cancelado.",[72,91],{"name":30,"latexOrText":73,"description":74,"variables":75},"t_w = 1.1 \\cdot R_A \\cdot C","Duração do pulso de saída (TI §6.3.1).",[76,81,86],{"symbol":77,"name":78,"typicalValue":79,"unit":80},"R_A","Resistor de temporização","100","kΩ",{"symbol":82,"name":83,"typicalValue":84,"unit":85},"C","Capacitor de temporização","10","µF",{"symbol":87,"name":88,"typicalValue":89,"unit":90},"t_w","Duração do pulso (calculada)","1.1","s",{"name":92,"latexOrText":93,"description":94,"variables":95},"Tensão no capacitor durante o pulso","V_C(t) = V_{CC}\\left(1 - e^{-t\u002F(R_A C)}\\right)","C1 carrega em direção ao VCC; o pulso termina quando V_C atinge 2\u002F3 VCC, em t = ln 3 · RA·C.",[96,101],{"symbol":97,"name":98,"typicalValue":99,"unit":100},"V_{CC}","Tensão de alimentação","5","V",{"symbol":102,"name":103,"typicalValue":104,"unit":90},"R_A C","Constante de tempo","1",[106,115,121,127,133,138,142],{"refDes":107,"componentName":108,"value":109,"package":110,"quantity":111,"componentSlug":112,"role":113,"notes":114},"U1","Temporizador de precisão","NE555P","PDIP-8",1,"ne555","Temporizador monoestável","TI NE555P; outras variantes do 555 exigem conferir a própria alimentação e saída.",{"refDes":116,"componentName":117,"value":118,"package":119,"quantity":111,"role":120},"R1","Resistor fixo","100kΩ","Axial 1\u002F4 W","Resistor de temporização RA",{"refDes":122,"componentName":123,"value":124,"package":125,"quantity":111,"role":83,"notes":126},"C1","Capacitor eletrolítico de alumínio","10µF","Radial","De baixa fuga; + no THRES\u002FDISCH; tensão nominal acima de VCC.",{"refDes":128,"componentName":129,"value":130,"package":131,"quantity":111,"role":132},"C2","Capacitor cerâmico","10nF","0805 \u002F radial","Desacoplamento do CONT",{"refDes":134,"componentName":129,"value":135,"package":131,"quantity":111,"role":136,"notes":137},"C3","100nF","Desacoplamento da alimentação","Perto dos pinos 8 e 1.",{"refDes":139,"componentName":117,"value":140,"package":119,"quantity":111,"role":141},"R2","10kΩ","Pull-up do TRIG",{"refDes":143,"componentName":144,"value":145,"package":146,"quantity":111,"role":147},"SW1","Chave táctil","START","SMD \u002F THT","Disparo",{"U1":149,"R1":155,"C1":161,"C2":170,"C3":177,"R2":183,"SW1":189},{"refDes":107,"name":150,"value":109,"role":113,"description":151,"componentSlug":112,"footprint":110,"specs":152},"Temporizador NE555","Uma borda de descida em TRIG (pino 2) abaixo de um terço de VCC seta o flip-flop interno: OUT (pino 3) vai para alto e o transistor de descarga em DISCH (pino 7) corta, então C1 começa a carregar através de R1. Quando C1 atinge dois terços de VCC em THRES (pino 6), o flip-flop é resetado, OUT vai para baixo e DISCH esvazia C1 para o próximo ciclo. RESET (pino 4) está ligado ao VCC, então nunca interrompe a temporização.",{"Tensão de alimentação":28,"Corrente de saída":46,"Nível de TRIG com VCC = 5 V":153,"Nível de THRES com VCC = 5 V":154},"1,67 V típico (1,1 V – 2,2 V)","3,3 V típico (2,4 V – 4,2 V)",{"refDes":116,"name":120,"value":118,"role":156,"description":157,"footprint":119,"specs":158},"Carrega C1 e define a duração do pulso","Carrega C1 a partir do VCC durante o pulso. Com C1 define tw = 1.1 × RA × C. A TI especifica o temporizador com RA de 2 kΩ a 100 kΩ; valores maiores funcionam, mas então a fuga do capacitor e a corrente de entrada do THRES acrescentam erro.",{"Resistência":159,"Faixa de teste da TI":160},"100 kΩ","2 kΩ – 100 kΩ (SLFS022K §5.6, nota 2)",{"refDes":122,"name":162,"value":124,"role":163,"description":164,"footprint":165,"specs":166},"Capacitor de temporização C","Armazena a carga de temporização","Carrega através de R1 enquanto OUT está alto e é descarregado pelo pino 7 no fim do pulso. Seu terminal positivo fica voltado ao nó THRES\u002FDISCH. Com R1 = 100 kΩ dá um pulso de cerca de 1,1 s (calculado).","Radial electrolytic",{"Capacitância":167,"Polaridade":168,"Duração do pulso":169},"10 µF","+ no THRES\u002FDISCH","≈ 1,1 s com R1 = 100 kΩ (calculado)",{"refDes":128,"name":171,"value":130,"role":172,"description":173,"footprint":174,"specs":175},"Desacoplamento da tensão de controle","Filtra o pino CONT","Do CONT (pino 5) ao terra. O CONT carrega o limiar interno de 2\u002F3 VCC; a TI desenha um capacitor aqui para que o ruído da alimentação não desloque o limiar nem a duração do pulso.","Ceramic 0805 \u002F radial",{"Capacitância":176},"10 nF (valor escolhido; a figura 6-2 da TI mostra o capacitor sem valor)",{"refDes":134,"name":178,"value":135,"role":179,"description":180,"footprint":174,"specs":181},"Capacitor de desacoplamento da alimentação","Desacopla o VCC","Do VCC ao terra, perto do temporizador. A TI recomenda um capacitor de desacoplamento do VCC ao pino de terra e afirma que um cerâmico de 0,1 µF é suficiente.",{"Capacitância":182},"Cerâmico de 0,1 µF (TI §7.3)",{"refDes":139,"name":184,"value":140,"role":185,"description":186,"footprint":119,"specs":187},"Pull-up do disparo","Mantém TRIG alto entre os pulsos","Mantém TRIG em VCC enquanto o botão está solto, então o temporizador só parte com um toque. Não faz parte da figura 6-2 da TI, que mostra uma entrada acionada.",{"Resistência":188},"10 kΩ",{"refDes":143,"name":190,"value":145,"role":191,"description":192,"footprint":193,"specs":194},"Botão START","Entrada de disparo","Puxa TRIG para o terra enquanto apertado e inicia um pulso. Qualquer saída de coletor aberto ou lógica que leve TRIG abaixo de um terço de VCC pode substituí-lo.","Tactile switch",{"Função":195},"TRIG no GND enquanto apertado",{"schemaVersion":197,"id":198,"meta":199,"components":206,"nets":300,"junctions":360,"netLabels":386,"wires":387},"1.5","ne555_monostable",{"title":200,"locale":201,"grid":202,"source":203},"Temporizador monoestável de atraso com NE555","pt",20,{"type":204,"ref":205,"url":17},"datasheet","Texas Instruments xx555 Precision Timers, SLFS022K, revised March 2026: §6.3.1 Figure 6-2 \"Circuit for Monostable Operation\" (p. 11) and tw = 1.1 × RA × C; §5.5–5.6 (pp. 5–7); §7.3 (p. 18). Adaptation: RA = 100 kΩ, C = 10 µF, CONT bypass 10 nF, supply bypass 100 nF (§7.3), START push button with 10 kΩ pull-up as the trigger input.",[207,217,224,233,239,245,251,256,262,268,274,280,286,292],{"id":208,"symbolId":209,"refDes":210,"position":211,"rotation":214,"properties":215},"comp-p-vcc","port.power","P_VCC",{"x":212,"y":213},140,80,0,{"value":216,"netName":216},"VCC",{"id":218,"symbolId":219,"refDes":134,"position":220,"rotation":222,"properties":223},"comp-c3","capacitor.ceramic",{"x":221,"y":212},200,90,{"value":135},{"id":225,"symbolId":226,"refDes":227,"position":228,"rotation":214,"properties":231},"comp-gnd-c3","gnd.port","P_GND_C3",{"x":229,"y":230},160,240,{"value":232},"GND",{"id":234,"symbolId":235,"refDes":139,"position":236,"rotation":222,"properties":238},"comp-r2","resistor.iec",{"x":237,"y":212},260,{"value":140},{"id":240,"symbolId":241,"refDes":143,"position":242,"rotation":222,"properties":244},"comp-sw1","button.momentary",{"x":243,"y":243},300,{"value":145},{"id":246,"symbolId":226,"refDes":247,"position":248,"rotation":214,"properties":250},"comp-gnd-sw1","P_GND_SW1",{"x":237,"y":249},400,{"value":232},{"id":252,"symbolId":235,"refDes":116,"position":253,"rotation":222,"properties":255},"comp-r1",{"x":254,"y":212},340,{"value":118},{"id":257,"symbolId":258,"refDes":122,"position":259,"rotation":222,"properties":261},"comp-c1","capacitor.electrolytic",{"x":254,"y":260},500,{"value":124},{"id":263,"symbolId":226,"refDes":264,"position":265,"rotation":214,"properties":267},"comp-gnd-c1","P_GND_C1",{"x":243,"y":266},600,{"value":232},{"id":269,"symbolId":219,"refDes":128,"position":270,"rotation":222,"properties":273},"comp-c2",{"x":271,"y":272},380,320,{"value":130},{"id":275,"symbolId":226,"refDes":276,"position":277,"rotation":214,"properties":279},"comp-gnd-c2","P_GND_C2",{"x":254,"y":278},420,{"value":232},{"id":281,"symbolId":282,"refDes":107,"position":283,"rotation":214,"properties":284},"comp-u1","ic.timer.ne555",{"x":249,"y":221},{"value":109,"package":110,"manufacturer":285,"mpn":109},"Texas 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de áudio e ondas quadradas de frequência ajustável.",7,4,"gerador astável de onda quadrada com ne555\noscilador de relaxação padrão da indústria que gera pulsos de clock de precisão, tons de áudio e ondas quadradas de frequência ajustável.\ngerador astável de onda quadrada com ne555\noscilador de relaxação padrão da indústria que gera pulsos de clock de precisão, tons de áudio e ondas quadradas de frequência ajustável.\nne555 astable square wave generator\nindustry-standard relaxation oscillator generating precision clock pulses, audio tones, and variable-frequency square waves.\ntiming_oscillators\ncircuito integrado temporizador bipolar de precisão ne555\nne555p\nu1\nresistor de filme metálico 0.25 w (1\u002F4w)\n10kω\nr1\nresistor de filme metálico 0.25 w (1\u002F4w)\n47kω\nr2\ncapacitor de filme metalizado ou cerâmico\n100nf\nc1\ncapacitor cerâmico multicamada (mlcc)\n10nf\nc2\ncapacitor eletrolítico de alumínio\n100µf\nc3\ncapacitor cerâmico multicamada (mlcc)\n100nf\nc4",{"slug":613,"cluster":20,"tier":21,"supplyVoltage":614,"voltageSpecification":615,"signalDomain":618,"breadboardFriendly":619,"title":620,"shortDescription":621,"bomCount":622,"formulaCount":623,"search":624},"bjt-astable-multivibrator-led-flasher",[600],{"kind":603,"value":616,"label":617},"5,0 V CC nominal assumida em projeto para demonstração educacional. Requer margem suficiente acima da tensão direta do LED azul (~3,3 V típ.) para polarizar resistores de coletor e base; transientes reversos base-emissor devem permanecer dentro do limite máximo absoluto (VEBO = 6,0 V para 2N3904BU).","Tensão nominal de alimentação","analog",false,"Multivibrador astável com transistores bipolares (pisca-pisca LED)","Oscilador de relaxação discreto de dois transistores com acoplamento cruzado acionando LEDs alternados sem circuitos integrados.",10,3,"multivibrador astável com transistores bipolares (pisca-pisca led)\noscilador de relaxação discreto de dois transistores com acoplamento cruzado acionando leds alternados sem circuitos integrados.\nmultivibrador astável com transistores bipolares (pisca-pisca led)\noscilador de relaxação discreto de dois transistores com acoplamento cruzado acionando leds alternados sem circuitos integrados.\nbjt astable multivibrator led flasher\ndiscrete two-transistor cross-coupled relaxation oscillator driving alternating leds without an integrated circuit.\ntiming_oscillators\ntransistor de junção bipolar npn\n2n3904bu\nq1\ntransistor de junção bipolar npn\n2n3904bu\nq2\nresistor de filme de carbono de 1\u002F4 w\n1kω\nr1\nresistor de filme de carbono de 1\u002F4 w\n47kω\nr2\nresistor de filme de carbono de 1\u002F4 w\n47kω\nr3\nresistor de filme de carbono de 1\u002F4 w\n1kω\nr4\ncapacitor cerâmico multicamada x7r não polarizado\n10µf\nc1\ncapacitor cerâmico multicamada x7r não polarizado\n10µf\nc2\nled indicador vermelho padrão de 5 mm\nred\nd1\nled indicador azul padrão de 5 mm\nblue\nd2",{"slug":626,"cluster":627,"tier":21,"supplyVoltage":628,"voltageSpecification":630,"signalDomain":633,"breadboardFriendly":14,"title":634,"shortDescription":635,"bomCount":609,"formulaCount":610,"search":636},"2n2222-relay-driver-flyback-protection","microcontroller_interfaces",[629,600,601],"3.3v",{"kind":603,"value":631,"label":632},"+12.0 V CC nominal (faixa operacional de +10.8 V a +13.2 V)","Tensão de alimentação do relé (VLOAD)","digital","Driver de relé com BJT NPN 2N2222 \u002F 2N2222A e diodo flyback 1N4007","Circuito de chaveamento de lado baixo com transistor bipolar NPN para relé de 12V com diodo flyback 1N4007, acionamento por saturação e desacoplamento de alimentação para MCU de 3.3V\u002F5V.","driver de relé com bjt npn 2n2222 \u002F 2n2222a e diodo flyback 1n4007\ncircuito de chaveamento de lado baixo com transistor bipolar npn para relé de 12v com diodo flyback 1n4007, acionamento por saturação e desacoplamento de alimentação para mcu de 3.3v\u002F5v.\ndriver de relé com bjt npn 2n2222 \u002F 2n2222a e diodo flyback 1n4007\ncircuito de chaveamento de lado baixo com transistor bipolar npn para relé de 12v com diodo flyback 1n4007, acionamento por saturação e desacoplamento de alimentação para mcu de 3.3v\u002F5v.\n2n2222 \u002F 2n2222a npn bjt relay driver with 1n4007 flyback clamping diode\ndiscrete npn bipolar junction transistor low-side relay driver circuit with 1n4007 flyback suppression diode, base saturation drive, and supply decoupling for 3.3v\u002F5v mcu control.\nmicrocontroller_interfaces\ntransistor bipolar npn de uso geral\n2n2222a\nq1\ndiodo retificador \u002F grampeador de uso geral\n1n4007\nd1\nrelé subminiatura eletromecânico spdt\ng5v-1-dc12\nk1\nresistor limitador de base 1 kω\n1kω\nr1\nresistor pull-down de base 10 kω\n10kω\nr2\ncapacitor cerâmico de desacoplamento mlcc\n100nf 50v\nc1\ncapacitor eletrolítico de desacoplamento de alumínio\n47µf 25v\nc2",1793836434420]