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LM358 Dual Op-Amp

The default jellybean op-amp: two channels, runs from a single supply, and cannot reach either rail.

Cheat sheet (SVG)

Logic level: 3-32 V single or +/-1.5-16 V split
Package: PDIP-8 / SOIC-8

1.Pinout diagram

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Pins 1-4

LM358

Pins 5-8

Pin detail

Hover a pin for its mappings and gotchas. Click to keep it here.

Logic level: 3-32 V single or +/-1.5-16 V split
Package: PDIP-8 / SOIC-8

Fig. 1. LM358 Dual Op-Amp, PDIP-8. Hover or tap a signal to light up every pin that carries it.

2.Watch out

Not rail to rail. The output gets within about 1.5 V of V+ and the input common mode range stops 1.5 V below it too. On a 3.3 V rail that leaves almost nothing, which is why it misbehaves in modern designs.
The output does reach close to ground, which is the trick that makes single supply work at all. Sinking current near 0 V is weak though, roughly 50 uA without a pull-down resistor.
There is crossover distortion in the output stage. Fine for DC and sensor conditioning, audibly bad for audio. Use a TL072 or an NE5532 there.
1 MHz gain bandwidth. At a gain of 100 you have 10 kHz of bandwidth left, and no more.
The LM393 comparator shares this package and pin arrangement but has an open collector output. The two look identical on a board and are not interchangeable.
Pin 4 is the negative supply, which is ground in a single supply circuit. Pin 8 is V+. That is the opposite corner pair from most DIP-8 logic.

3.Single-supply follower

What has to go around the chip before it will run.

Fig. 2. Single-supply follower, drawn from Table 1. Dashed parts are optional. Crossing wires are not connected.

Table 1. External parts, and why each one is there.
Part	Between	Why
Wire link	OUT1 (1) to IN1- (2)	Output straight back to the inverting input. Unity gain, the simplest useful configuration.
100 kOhmoptional	IN1+ (3) to VCC	Half-rail bias. On a single supply the input has to sit somewhere the amplifier can actually reach.
100 kOhmoptional	IN1+ (3) to GND	The lower half of the same divider.
1 uFoptional	IN1+ (3) to GND	Stops supply noise riding straight through the bias divider into the input.
100 nF	V+ (8) to GND	Supply decoupling at the pin.

The input range includes ground but the output does not: it only swings down to about 20 mV above the negative rail, and up to about 1.5 V below the positive one. The LM358 is not rail to rail, whatever the breakout board says.

4.Full pin reference

Every pin, alias and mapping. This is the table that prints.

Table 2. Pin assignments.

Complete pin reference for LM358 Dual Op-Amp
Pin	Name	Also called	Functions	Notes
1	OUT1	OUTA	Amplifier 1 output
2	IN1-ADC	INA-	Amplifier 1 inverting input
3	IN1+ADC	INA+	Amplifier 1 non-inverting input
4	V-	GND, VEE	Negative supply	Ground in a single supply circuit.
5	IN2+ADC	INB+	Amplifier 2 non-inverting input
6	IN2-ADC	INB-	Amplifier 2 inverting input
7	OUT2	OUTB	Amplifier 2 output
8	V+3-32 V	-	Positive supply	100 nF to ground at the pin.

Looking for a substitute?

LM358, 5 alternatives

Primary sources

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