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TECH PUBLIC AMS1117-3.3S AMS1117
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TECH PUBLIC AMS1117-3.3S
- Type
- TECH PUBLIC
- Minimum package
- 1000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 1.2V@(1A)
- Electronic Component
- TECH PUBLIC
- Electronic Component
- 0.003%Vout
- Electronic Component
- AMS1117-3.3S
- Electronic Component
- 1
- Package
- SOT-89
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.143g
- Electronic Component
- 1
- Electronic Component
- BM0231019662
- Operating Temperature
- 40℃~+125℃@(Tj)
- Operating Voltage
- 12V
- Output
- Electronic Component
- Output Voltage
- 3.3V
- Output Current
- 1A
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
AMS1117-3.3S 产品概述 — TECH PUBLIC (台舟电子)
一、概述
AMS1117-3.3S 是一款固定输出（3.3V）的线性低压差稳压器，单通道输出，正极性设计，采用 SOT-89 小封装。器件在典型 12V 工作系统中可稳定提供最高 1A 的输出电流，集成过流保护与热关断功能，适用于对供电简单、纹波抑制要求较高且成本敏感的应用。
二、主要参数
- 输出电压：3.3V（固定）
- 输出电流：最大 1A
- 工作电压/供电环境：适配 12V 系统（应注意输入-输出压差）
- 压差（Dropout）：1.2V @ 1A
- 静态电流（Iq）：约 5mA
- PSRR：75dB @ 120Hz（良好纹波抑制能力）
- 噪声：0.003% × Vout（约 99µV，按 3.3V 计算）
- 保护特性：过流保护（OCP），热关断（Thermal Shutdown）
- 工作结温：-40°C ~ +125°C（Tj）
- 封装：SOT-89
三、性能亮点
器件在中等负载下表现出较好的纹波抑制（75dB@120Hz）与极低的输出噪声，适合对模拟、数字混合电路中对电源噪声敏感的子系统供电。集成保护电路提高了系统可靠性，SOT-89 封装在体积受限的场合具有较好的可装配性。
四、热管理与电源效率提示
线性稳压器的功耗由 (Vin−Vout)×Iout 决定。若在 12V 输入、1A 输出条件下，器件需耗散约 8.7W 热量，SOT-89 封装无法在无散热片或无足够铜箔散热的情况下长期承受此功率。建议：
- 降低输入电压或采用开关降压转换器用于大功率场合；
- 提供足够的 PCB 铜层散热或加装散热器；
- 在高电流应用中限制最大持续电流，或并联/改用更大封装器件。
五、外部器件与布局建议
为保证稳定性与降低瞬态响应时间，推荐在输入端和输出端并联电容：
- 输入侧：0.1–10µF（陶瓷或钽电容）以抑制高频干扰；
- 输出侧：建议低 ESR 的 10µF 电容以保证环路稳定性（参考器件具体数据表以确定 ESR 范围）。
布线时保持输入/输出地回路短且粗，靠近器件布置去耦电容，热源远离敏感器件。
六、典型应用场景与选型建议
适用于单片机供电、传感器/ADC 前端电源、通信模块的本地线性调整及实验台/参考电源等低成本、低噪声需求场合。但若输入电压与输出电流乘积导致较大功耗（如 12V→3.3V @1A），建议使用开关降压模块以提升效率并减轻热设计负担。
总结：AMS1117-3.3S（TECH PUBLIC/台舟电子）在小体积、低噪声、良好纹波抑制与保护功能方面具有优势，适合合理功率范围内的稳压应用。选择时请综合考虑输入电压、负载电流与散热方案以确保长期可靠工作。
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