WMSIC Electronic Components

TECH PUBLIC AMS1117-3.3V AMS1117

ModelAMS1117-3.3V
PackageSOT-223
BrandTECH PUBLIC
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 26+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
TECH PUBLIC AMS1117-3.3V
Type
TECH PUBLIC
Minimum package
4000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
1.2V@(1A)
Electronic Component
TECH PUBLIC
Electronic Component
AMS1117-3.3V
Electronic Component
1
Package
SOT-223
Electronic Component
Linear Regulator(LDO)
Electronic Component
0.18g
Electronic Component
1
Electronic Component
BM0230027712
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.

AMS1117-3.3V 产品概述

一、产品简介

AMS1117-3.3V(品牌:TECH PUBLIC / 台舟电子,封装:SOT-223)是一款固定输出的线性低压差稳压器,输出电压为3.3V,适用于对成本、尺寸和静态噪声有一定要求的直流电源降压场合。器件支持单通道输出,输出极性为正极,工作电压常见输入场景为12V。器件集成过流保护与热关断功能,提高系统的可靠性。

二、主要电气参数

  • 输出类型:固定(3.3V)
  • 工作温度:-50℃ ~ +140℃
  • 静态电流(Iq):典型 8mA
  • 最高输出电流:1A(短时可达,需注意散热和保护)
  • 压降(压差):1.2V @ 1A
  • 功能特性:过流保护、热关断
  • 封装:SOT-223,便于手工焊接与PCB安装

三、热与功耗考量

线性稳压器的功耗由电压降与负载电流决定:Pd = (Vin - Vout) × Iout。
例如,Vin = 12V、Vout = 3.3V、Iout = 1A 时,Pd = (12 - 3.3) × 1 ≈ 8.7W。SOT-223 封装在此功耗下难以散热,器件会触发热关断或损伤。实际设计中建议:

  • 限制输出电流或降低输入电压(接近 Vout + 压降);
  • 在PCB上使用大面积铜箔散热,SOT-223焊盘接大铜箔或加装散热片;
  • 对高功率场合优先考虑开关稳压方案以提高效率。

四、外围电路与布局建议

  • 输入侧建议并联至少 10µF 去耦电容(低ESR),靠近器件输入脚布置;
  • 输出侧建议使用 10µF 低ESR 电容(如钽电容或固态电解),放置在输出脚附近以保证稳定性;
  • 地线尽量做为完整平面,电容地线短且粗;
  • 输入、输出走线尽量短,避免在热源附近布置敏感元件。

五、保护与可靠性

器件内置过流限制与热关断,能在短路或过载时保护自身与外部负载,但不代替电路层面的保护设计。推荐在输入侧加入熔断器或限流元件,在长期高负载场景下监测温升与输出漂移,保证长期稳定工作。

六、典型应用场景

  • 单片机、传感器模块和通讯模块的3.3V电源;
  • 低功耗消费电子、电路原型与小批量工业控制板;
  • 需要简单、低噪声、低成本线性电源的设备(注意功率与散热限制)。

七、选型提示

若系统输入与输出电压差较小且电流不大,AMS1117-3.3V 为经济且易用的选择;若输入-输出差大且负载电流超过几百毫安,建议评估开关降压方案或改用更大散热能力的封装。购买时确认台舟电子(TECH PUBLIC)正品,核对封装、批次与规格书以保证一致性。

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