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LM324N

Quad general-purpose op-amp, 1MHz, 3-32V single supply, GND-referenced, PDIP-14

15000

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制造商零件：

LM324N

包装：

PDIP-14 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

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说明

产品概览

The LM324N from Texas Instruments is the industry-standard quad general-purpose operational amplifier with single-supply operation (3V-32V), input common-mode range including ground, and 1MHz gain-bandwidth product — four op-amps in a single 14-pin PDIP package.

主要规格

通道数 4 (quad, independent)
Supply Voltage Range 3V to 32V (single) or ±1.5V to ±16V (dual)
增益-带宽乘积 1MHz (1.2MHz typical)
压摆率 0.5V/µs typical
Open-Loop Voltage Gain 100dB typical (100V/mV)
输入失调电压 2mV typical, 7mV max
输入偏置电流 45nA typical, 250nA max
Input Offset Current 5nA typical, 50nA max
Input Common-Mode Range 0V to V+−1.5V (includes GND)
Output Voltage Swing 0V to V+−1.5V (single supply)
输出电流 20mA typical (source/sink)
Supply Current (all 4 amps) 700µA typical (independent of supply)
CMRR 85dB typical
工作温度 0°C to +70°C
包装 PDIP-14 (19.3 x 6.35mm)

特点

  • Four internally compensated op-amps in one package
  • Single-supply operation: 3V to 32V
  • Input common-mode range includes ground (GND)
  • Output swings to GND (no negative supply needed)
  • 700µA total supply current — battery friendly
  • Internally frequency compensated for unity gain

应用

  • Single-supply signal conditioning
  • Transducer amplifier interfaces
  • 直流增益块
  • 有源滤波器
  • Comparators
  • Oscillators

The LM324N from Texas Instruments is the most widely used quad operational amplifier, containing four independent high-gain internally frequency-compensated op-amps in a single 14-pin DIP package. Its defining advantage over the LM741 and LM358 is the combination of four channels AND single-supply operation. The input common-mode voltage range includes ground (0V), meaning the non-inverting input can be connected directly to GND without a negative supply — critical for single-supply designs where the signal is referenced to ground. The output can also swing to within a few millivolts of ground (when sinking current), and up to V+−1.5V when sourcing. The 1MHz GBW and 0.5V/µs slew rate limit it to low-frequency applications (full-power bandwidth ≈ 8kHz at ±10V output). The total supply current of only 700µA for all four amplifiers makes it suitable for battery operation. At $0.316/1ku, the LM324 is the most cost-effective way to get four op-amps. The N suffix denotes the PDIP-14 through-hole package.

Each of the four op-amps in the LM324N is a voltage-feedback amplifier with internal compensation. The PNP input stage allows the common-mode range to include ground (the PNP emitters are biased at ~0.6V above the inputs, so the inputs can go to 0V). The class AB output stage can both source and sink current, with the output swinging to within ~5mV of ground when sinking small currents and to V+−1.5V when sourcing. In single-supply operation, the signal must remain within 0V to V+−1.5V at both input and output. For AC-coupled applications, a bias voltage (typically V+/2) establishes the operating point. For DC applications with ground-referenced signals (like sensor outputs that vary from 0V upward), no bias is needed — the input can go to 0V and the output can swing to near 0V. The internal 30pF compensation capacitor creates a dominant pole at ~10Hz, rolling off the gain at 20dB/decade to cross unity gain at 1MHz. Closed-loop bandwidth = GBW/noise_gain; at gain=100, BW ≈ 10kHz. The 700µA total quiescent current is essentially independent of supply voltage (3V to 32V), thanks to a constant-current bias network.

针脚 名称 类型 说明
1 1OUT 输出 Op-amp 1 output
2 1IN− 输入 Op-amp 1 inverting input
3 1IN+ 输入 Op-amp 1 non-inverting input
4 VCC 电源 Positive supply (3V to 32V)
5 2IN+ 输入 Op-amp 2 non-inverting input
6 2IN− 输入 Op-amp 2 inverting input
7 2OUT 输出 Op-amp 2 output
8 3OUT 输出 Op-amp 3 output
9 3IN− 输入 Op-amp 3 inverting input
10 3IN+ 输入 Op-amp 3 non-inverting input
11 GND / V− 电源 Ground or negative supply
12 4IN+ 输入 Op-amp 4 non-inverting input
13 4IN− 输入 Op-amp 4 inverting input
14 4OUT 输出 Op-amp 4 output
  • Single-Supply Non-Inverting Amp: Sensor (0-1V) → 1IN+; Rf/Rg = 4; 1OUT = 0-5V; VCC = 5V single supply; GND = pin 11
  • Comparator: Sensor → 1IN+; threshold voltage → 1IN−; 1OUT drives LED; no feedback resistor; open-loop comparison
  • 4-Channel Signal Conditioner: 4 sensors → 4 op-amps; each configured for appropriate gain; single VCC supply; one IC handles all 4 channels
  • Active Filter: Sallen-Key low-pass: 2 resistors + 2 capacitors per op-amp; cutoff at desired frequency; remaining 2 op-amps for gain stages
  • AC-Coupled Amp: VCC=12V; two 10kΩ resistors create V+/2 = 6V bias at 1IN+; AC signal through coupling cap + Rin → 1IN−; Rf feedback; output centered at 6V
模型 制造商 主要区别 包装 Specs
LM324AN TI Improved version with lower 2mV max input offset voltage for precision measurement circuits DIP-14 1.1MHz/4-ch
LM324B TI Modern upgrade: 36V supply, 1.2MHz GBW, 3mV offset, rail-to-rail output swing capability DIP-14 1.2MHz/36V
LM358N TI Dual op-amp version (2 channels) in DIP-8 for simpler single/dual signal chain designs DIP-8 1.1MHz/2-ch
TL074CN TI Quad JFET-input op-amp with 65pA input bias current and 3MHz GBW for low-noise applications DIP-14 3MHz/JFET
LM2902N TI Automotive-grade -40 to +125C version for under-hood and industrial environments DIP-14 1.1MHz/-40-125C
MCP6004-I/P 微型芯片 Low-voltage 1.8-6V quad R-R op-amp with 1MHz GBW for battery-powered instrumentation DIP-14 1MHz/1.8-6V

LM324N is the industry-standard quad general-purpose op-amp in DIP-14 with 1.1MHz GBW and 3-32V single-supply operation. All four channels share the same power rails. LM324B offers modern 36V rail-to-rail output. For JFET-input low-noise applications, TL074 provides 3MHz GBW and 65pA bias current. For low-voltage designs, MCP6004 operates down to 1.8V.

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Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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