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GR LM321
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- GR LM321
- Type
- GR
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- GR
- Electronic Component
- LM321
- Electronic Component
- 1
- Package
- SOT-23-5
- Electronic Component
- Operational Amplifier
- Electronic Component
- 0.03g
- Electronic Component
- 1
- Features
- Built-in
- Electronic Component
- BM0264390958
- Operating Temperature
- 0℃~+70℃
- Amplifier
- 1
- (SR)
- 400V/ms
- Power Supply Voltage
- 3V~36V
- Static Current(Iq)
- 500uA
- Electronic Component
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM321（GR 国睿）产品概述
一、概述
LM321 是一款单通道、低功耗通用运算放大器，适合要求低静态电流与广泛电源范围的模拟前端应用。器件在 SOT-23-5 小封装中提供，工作温度为 0℃~+70℃，并内置补偿，便于在单位增益下稳定工作。典型应用包括传感器信号调理、便携设备前置放大、低速主动滤波与基准放大等。
二、主要电气参数与意义
- 电源范围：单电源 3V~36V，双电源 ±18V（最大电源宽度 36V），适应宽电源设计和工业级电压。
- 增益带宽积（GBW）：1.2MHz，表示闭环增益为 10 时带宽约 120kHz，适合低频至中频信号放大。
- 压摆率（SR）：400V/ms（即 0.4V/µs），对高频大幅度波形有一定限制，设计时需注意失真与速率限制。
- 输入失调电压（Vos）：5mV，输入偏置电流 Ib ≈ 50nA，输入失调电流 Ios ≈ 10nA，精密直流放大时可能需偏置或校准。
- 共模抑制比（CMRR）：80dB，静态误差抑制能力属中等水平。
- 静态电流（Iq）：500µA，低功耗设计友好，适合电池供电场合。
示例计算：在 1V 峰值正弦信号下，最大无失真的频率由 SR 决定，fmax ≈ SR / (2π·Vpk) ≈ 0.4V/µs / (2π·1V) ≈ 63.7kHz；若闭环增益为 10，带宽 ≈ 120kHz，二者需综合考虑。
三、典型应用场景
- 传感器接口：低偏置电流适合高阻抗传感器；在低速测量或滤波场合可作为差分/单端放大器。
- 便携与电池设备：500µA 的静态电流有利于延长电池寿命。
- 音频前置放大与滤波：GBW 与 SR 对于低频音频放大足够，但对高功率或高频音频限制较多。
- 模拟信号处理：积分器、低通/带通主动滤波器、采样前缓冲等。
四、设计与布局建议
- 电源旁加 0.1µF 陶瓷去耦，靠近器件供电引脚放置，抑制瞬态和振铃。
- 输入端尽量减小高频寄生，长导线和不对称阻抗会引入偏移与噪声。若使用高阻抗源，考虑并联偏置或输入保护以限制偏置电流引起的误差。
- 输出驱动能力在文档中未给出，设计时应验证在目标负载下的摆幅与驱动能力，避免把运放当做比较器使用。
- 在需要高直流精度的场合，采用偏置平衡或微调电路来补偿 Vos 与 Ios 带来的误差。
五、封装与温度等级
SOT-23-5 小封装适合空间受限的消费电子与便携设备设计。工作温度为 0℃~+70℃，属商业级器件，工业级温度（-40℃）应用需谨慎确认。
六、结论
GR（国睿）品牌的 LM321 为一款功能全面、功耗低、供电范围宽的通用运放。凭借内置补偿与 SOT-23-5 小封装，适合多数低频模拟电路与电池供电场景。在电路设计时，应注意压摆率与 GBW 的相互制约、偏置电流与失调电压对直流精度的影响，并做好电源去耦与 PCB 布局，以获得稳定可靠的性能。
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