WMSIC Electronic Components

JSMSEMI(杰盛微) LM321MFX

ModelLM321MFX
PackageSOT-23-5
BrandJSMSEMI
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
JSMSEMI LM321MFX
Type
JSMSEMI
Minimum package
3000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
JSMSEMI
Electronic Component
LM321MFX
Electronic Component
1
Package
SOT-23-5
Electronic Component
Operational Amplifier
Electronic Component
0g
Electronic Component
1
Electronic Component
Operational Amplifier
Electronic Component
BM0257711920
Operating Temperature
0℃~+70℃
Amplifier
Electronic Component
(SR)
0.45V/us
Electronic Component
Electronic Component
Electronic Component
3000
Static Operating Current
660uA

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

LM321MFX 产品概述

一、产品简介

LM321MFX 是 JSMSEMI(杰盛微)推出的一款单路运算放大器,封装为 SOT-23-5,面向体积受限且要求低功耗、低速放大的应用。器件静态工作电流仅 660 μA,适合需要长时间工作且功耗敏感的便携式与嵌入式系统。工作温度范围为 0℃~+70℃,定位于工业级至商业级环境下的通用信号放大与接口电路。

二、主要性能指标

  • 共模抑制比(CMRR):90 dB
  • 压摆率(SR):0.45 V/μs
  • 增益带宽积(GBP):1.1 MHz
  • 输入失调电压(Vos):5 mV
  • 放大器数量:单路
  • 静态工作电流:660 μA
  • 封装:SOT-23-5
  • 品牌:JSMSEMI(杰盛微)

三、性能解读与设计要点

  • 带宽与增益:GBP=1.1 MHz,闭环增益与带宽成反比,例如闭环增益为 10 时近似带宽为 110 kHz,适合中低频信号处理。
  • 压摆率限制:SR=0.45 V/μs 意味着对快速大幅度波形(例如音频大电平或方波)可能发生波形失真。在设计放大低频正弦信号时,可用公式 Vpk_max = SR / (2πf) 估算最大无失真幅值。
  • 偏置与精度:输入失调 5 mV 在精密测量场合需考虑校准或外加偏置去除措施;对于高增益应用,失调会被放大。
  • 共模抑制:CMRR=90 dB 对共模干扰有良好抑制能力,适用于有共模噪声存在的传感器前端与差分信号接口。
  • 电源与功耗:静态电流 660 μA,在电池供电系统中属于低功耗类别,但不是超低功耗型;建议在系统级考虑待机策略以延长续航。

四、典型应用场景

  • 传感器信号调理:温度、压力、光电传感器前置放大与滤波。
  • 低频滤波与缓冲:主动低通、高通或带通滤波器,以及输出驱动较小负载的缓冲器。
  • 模拟开关后级放大:在多路采集系统中用于通用放大与抗干扰。
  • 音频前端(低增益、低失真)与仪表放大(需注意失调精度限制)。

五、封装与布局建议

  • SOT-23-5 小型封装适合空间受限应用;焊盘与散热需要按厂商推荐布局,保证可靠焊接与热传导。
  • 电源去耦:建议在 VCC 与 GND 之间放置 0.1 μF 陶瓷去耦电容,靠近管脚焊盘放置以抑制射频干扰与瞬态。
  • 输入保护与布局:对高阻源或微伏级信号源,采用短回路、良好接地和屏蔽以减少噪声耦合;必要时加入限流电阻或输入缓冲。
  • 温度与可靠性:工作温度 0℃~+70℃,在高温或工业严苛环境下需额外验证;建议在长期应用中做加速老化或筛选测试。

总结:LM321MFX 以低功耗、小封装和良好的共模抑制为特点,适合中低速、空间受限的模拟前端与通用放大场合。基于其 1.1 MHz 的 GBP 与 0.45 V/μs 的压摆率,在设计时需权衡带宽、失真与精度要求以达到最佳性能。

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