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LM358N

Dual op-amp, single supply 3-32V, 1.1MHz GBW, GND-referenced input, PDIP-8

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Manufacturer Part：

LM358N

Package：

PDIP-8 (9.81 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

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Description

Product Overview

The LM358N is a dual general-purpose operational amplifier from Texas Instruments with single-supply operation (3V to 32V), ground-referenced inputs, and 1.1MHz GBW in a PDIP-8 package.

Key Specifications

Number of Amplifiers 2 (dual)
Supply Voltage Range 3V to 32V (single) or ±1.5V to ±16V (dual)
GBW (Gain-Bandwidth Product) 1.1MHz typical
Slew Rate 0.6V/µs typical
Input Offset Voltage 2mV typical, 7mV max
Input Bias Current 45nA typical
Input Common-Mode Range 0V to VCC-1.5V (includes ground)
Output Voltage Swing 0V to VCC-1.5V (single supply)
Output Sink Current 20mA typical
Supply Current (both amps) 0.7mA typical at 5V
Operating Temperature 0°C to +70°C
Package PDIP-8 (9.81 x 6.35mm)

Features

  • Dual op-amp in single 8-pin package
  • Single-supply operation from 3V to 32V
  • Input common-mode range includes ground
  • Low supply current: 0.7mA for both amplifiers
  • 1.1MHz gain-bandwidth product
  • Internal frequency compensation (no external caps)
  • Short-circuit protected outputs
  • Direct replacement for LM358, LM2904, etc.

Applications

  • Single-supply signal conditioning
  • Transducer amplifier and sensor interface
  • DC gain blocks and active filters
  • Voltage comparators and window detectors
  • Audio preamplifiers and mixers

The LM358N from Texas Instruments consists of two independent high-gain operational amplifiers designed for single-supply operation from 3V to 32V (or dual supplies ±1.5V to ±16V). The key feature distinguishing it from general-purpose op-amps is the input common-mode voltage range that includes ground (0V), allowing direct ground-referenced sensing without a negative supply. The output can swing to within 1.5V of the positive rail (and nearly to ground under light load), providing maximum dynamic range in single-supply applications. The 1.1MHz GBW and 0.6V/µs slew rate are sufficient for DC and low-frequency applications. The 0.7mA total supply current for both amplifiers makes it attractive for battery-powered designs. The N suffix denotes the PDIP-8 through-hole package.

Each amplifier in the LM358N is a conventional voltage-feedback operational amplifier with a PNP differential input stage that allows the input common-mode range to extend to ground. This is achieved because the input transistors’ collectors connect to the positive supply, and their emitters (through current sources) connect to the input pins. When both inputs are at 0V, the transistors are still active because VCE > 0. The output stage uses a class-AB push-pull configuration that can both source and sink current, but the output cannot swing all the way to VCC (typically reaches VCC-1.5V) due to the VBE drops in the output stage. In a non-inverting amplifier configuration, VOUT = VIN × (1 + RF/RI). In an inverting configuration, VOUT = -VIN × (RF/RI). The internal compensation capacitor provides unity-gain stability, allowing the device to operate with 100% feedback (voltage follower) without oscillation. The 1.1MHz GBW means the open-loop gain drops to unity at 1.1MHz; at a closed-loop gain of 10, the bandwidth is approximately 110kHz.

Pin Name Type Description
1 1OUT Output Amplifier 1 output
2 1IN- Input Amplifier 1 inverting input
3 1IN+ Input Amplifier 1 non-inverting input
4 GND Power Ground / negative supply
5 2IN+ Input Amplifier 2 non-inverting input
6 2IN- Input Amplifier 2 inverting input
7 2OUT Output Amplifier 2 output
8 VCC Power Positive supply (3V to 32V)

LM358N uses the PDIP-8 (N) package with industry-standard dual op-amp pinout: Pin 1 = Output A, Pin 2 = Inverting Input A (-), Pin 3 = Non-inverting Input A (+), Pin 4 = GND/VEE, Pin 5 = Non-inverting Input B (+), Pin 6 = Inverting Input B (-), Pin 7 = Output B, Pin 8 = VCC. This pinout is shared by all dual op-amps in DIP-8 including LM358, LM2904, RC4558, NE5532, and TL072. The single-supply operation (3V-32V or ±1.5V to ±16V) allows inputs to go to ground without phase reversal. Output swings to within 0-20mV of ground in single-supply configuration.

  • Single-Supply Sensing: Ground-referenced input directly amplifies sensor signals (thermistor, photodiode) without negative supply
  • Current Sensing: Differential amplifier across shunt resistor; output referenced to ground for ADC input
  • Buffer/Filter: Unity-gain follower for impedance matching; Sallen-Key active filter for signal conditioning
  • Comparator: Open-loop operation compares two voltages; output drives MCU GPIO or LED indicator
  • Audio Preamp: 1.1MHz GBW supports audio band (20Hz-20kHz) with gain up to 50x
Model Manufacturer Key Difference Package Specs
LM358AN TI Improved version with lower input offset voltage 2mV max vs 7mV for precision signal conditioning DIP-8 1.1MHz/0.6V/µs
LM358B TI Modern upgrade: 36V supply, 1.2MHz GBW, 3mV offset, and rail-to-rail output swing DIP-8 1.2MHz/36V
LM324N TI Quad op-amp version (4 channels) in DIP-14 for multi-stage signal chain applications DIP-14 1.1MHz/4-ch
LM2904N TI Automotive-grade -40 to +125C version with enhanced ESD protection for harsh environments DIP-8 1.1MHz/-40-125C
LMV358IDR TI Low-voltage 2.7-5.5V version with 1MHz GBW for 3.3V and battery-powered systems SOIC-8 1MHz/2.7-5.5V
NE5532P TI Dual low-noise audio op-amp with 10MHz GBW for audio preamp and filter applications DIP-8 10MHz/9V/µs

LM358 is the industry-standard dual general-purpose op-amp with 1.1MHz GBW and 3-32V single-supply operation. Input common-mode range includes ground for single-supply sensor interfacing. LM358B offers modern 36V rail-to-rail output. For quad needs, LM324 provides 4 channels. For audio, NE5532 offers 10MHz GBW and low noise. LM2904 extends temperature range to 125C for automotive applications.

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