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TECH PUBLIC LD1117-3.3 LD1117
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TECH PUBLIC LD1117-3.3
- Type
- TECH PUBLIC
- Minimum package
- 4000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 1.3V@(1A)
- Electronic Component
- TECH PUBLIC
- Electronic Component
- LD1117-3.3
- Electronic Component
- 1
- Package
- SOT-223
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.184g
- Electronic Component
- 1
- Electronic Component
- BM0227776261
- Operating Temperature
- 50℃~+140℃
- Operating Voltage
- 12V
- Output
- Electronic Component
- Output Voltage
- 3.3V
- Output Current
- 1A
- Output Type
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LD1117-3.3（TECH PUBLIC 台舟电子）产品概述
一、产品简介
LD1117-3.3 是一款固定输出 3.3V 的线性稳压器，采用 SOT-223 封装，单路输出设计，面向需要简单、低成本且稳定 3.3V 电源的嵌入式与模拟电路应用。典型工作输入为 12V（可接受更宽的输入范围，见注意事项），额定输出电流 1A，输出极性为正极。
二、关键参数与特性
- 输出电压：3.3V（固定）
- 输出电流：1A（最大）
- 压差（Dropout）：1.3V @ 1A（保证在高电流时仍能维持稳定输出）
- 静态电流（Iq）：约 4mA（低待机损耗）
- 保护特性：过流保护（OCP）、热关断（Thermal Shutdown）
- 工作温度：-50℃ ~ +140℃
- 封装：SOT-223
- 品牌：TECH PUBLIC（台舟电子）
三、热与功耗考量
线性稳压器的功耗等于输入与输出电压差乘以负载电流。若输入为 12V、输出 3.3V、输出电流 1A，则器件内部耗散功率约为 (12V − 3.3V) × 1A = 8.7W。SOT-223 在无大面积铜箔散热时难以安全耗散此级别热量，需采取下列措施之一：
- 降低输入电压以减少压降；
- 使用大面积 PCB 铜箔（散热铺铜）或外部散热片；
- 改用开关降压模块作为前级（DC-DC 降压）以降低线性器件热耗。
四、外围电路与稳定性建议
- 输入侧建议并联至少 10μF 电解/钽电容以抑制输入瞬态与减少导线感抗影响；
- 输出侧需配置低 ESR 电容（常用 10μF 钽电容或 10~22μF 低 ESR 电解电容）以保证稳压器稳定工作并改善瞬态响应；
- 布局上将输入、输出电容靠近引脚放置，缩短信号回路，增加接地铜面积以利散热与稳定。
五、应用场景
适用于单片机供电、传感器模组、通信终端的 3.3V 供电、小功率模拟电路以及需要简单高可靠度线性稳压的场合。由于其具备过流保护和热关断，适合对故障保护有基本要求的系统，但在高功率场合需考虑热管理。
六、选型与使用建议
- 若系统输入远高于输出（例如 12V），优先考虑采用开关降压或在前端增加预降压以减少 LD1117 的功耗；
- 对于空间受限且需 1A 输出的场合，应在 PCB 设计中做足散热铺铜，必要时使用外部散热片；
- 关注输出电容的类型与 ESR，错误的电容会导致稳压器振荡或瞬态性能恶化。
总结：TECH PUBLIC（台舟）LD1117-3.3 是一款结构简单、保护完备的 3.3V 线性稳压解决方案，适用于中低功率、对噪声敏感或对电源纹波要求严格的场合。但在高压差大电流应用时必须重视热量管理与功耗限制。
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