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LM324 Quad Op-Amp

Four LM358s in a DIP-14, and a completely different pin arrangement from the dual. Note the supply pins are not at the corners.

Cheat sheet (SVG)
Logic level
3-32 V single or +/-1.5-16 V split
Package
PDIP-14 / SOIC-14

1.Pinout diagram

Highlight a signalhover to preview, click to keep

Pins 1-7

LM324

Pins 8-14

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-14 / SOIC-14

Fig. 1. LM324 Quad Op-Amp, PDIP-14. Hover or tap a signal to light up every pin that carries it.

2.Watch out

  • VCC is pin 4 and GND is pin 11, in the middle of each side rather than at the corners. Every other jellybean in this package puts them at 14 and 7, so this one catches people out.
  • Same amplifier as the LM358: single supply, output reaches near ground but stops about 1.5 V below V+, 1 MHz gain bandwidth, crossover distortion in the output stage.
  • Not rail to rail. On a 3.3 V rail you have almost no usable output swing, which is why modern designs reach for an MCP6004 instead.
  • The LM339 is the comparator in this package and is NOT pin compatible with the LM324. Its supply pins are 3 and 12, and its outputs are open collector.
  • Unused amplifiers should be wired as unity-gain followers with the input tied to a mid-rail reference, not left floating.

3.Single-supply follower

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

VCCGNDLM324100 kOhm between IN1+ (3) and VCC100 kOhm100 kOhm between IN1+ (3) and GND100 kOhm100 nF between VCC (4) and GND100 nFVCC (4) to VCCGND (11) to GNDWire link between OUT1 (1) and IN1- (2)Wire linkOUT1 1IN1- 2IN1+ 3IN1+ 3VCC 4VCC 4GND 11
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.
PartBetween
Wire linkOUT1 (1) to IN1- (2)
100 kOhmoptionalIN1+ (3) to VCC
100 kOhmoptionalIN1+ (3) to GND
100 nFVCC (4) to GND

Same die family as the LM358, with four amplifiers instead of two. The output cannot reach the positive rail, so a follower biased at exactly half supply clips the top of a large signal first.

4.Full pin reference

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

Table 2. Pin assignments.

Complete pin reference for LM324 Quad Op-Amp
PinNameFunctions

Primary sources

Found a wrong pin? The whole board is one file, data/boards/lm324.json.

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