Four general-purpose operational amplifiers in one SOIC-14, the quad version of the LM358. Each runs from a single supply of 3 to 32 V (or a split supply) with an input range that includes the negative rail (ground), so it works in single-supply designs without a negative voltage. It is low power and inexpensive, which makes it the default op-amp for filters, buffers, summing amplifiers, and simple signal conditioning where precision is not critical. All four amplifiers share the V+ and GND pins.

Pinout

Pin	Name	Type	Function
1	1OUT	output	Output of op amp 1. Class-AB output stage capable of sourcing/sinking current; short-circuit protected to either supply rail.
2	1IN-	input	Inverting (negative) input of op amp 1. High-impedance input with typical input bias current of tens of nA; common-mode range includes V-.
3	1IN+	input	Non-inverting (positive) input of op amp 1. High-impedance input; common-mode range includes V- (ground) for single-supply operation.
4	VCC+	power_in	Positive (highest) supply. Operating range 3V to 32V (LM324) or up to 36V (LM324B); absolute maximum 32V (LM324/A) or 40V (LM324B).
5	2IN+	input	Non-inverting (positive) input of op amp 2. High-impedance input; common-mode range includes V-.
6	2IN-	input	Inverting (negative) input of op amp 2. High-impedance input; typical input bias current of tens of nA.
7	2OUT	output	Output of op amp 2. Class-AB output stage capable of sourcing/sinking current; short-circuit protected.
8	3OUT	output	Output of op amp 3. Class-AB output stage capable of sourcing/sinking current; short-circuit protected.
9	3IN-	input	Inverting (negative) input of op amp 3. High-impedance input; typical input bias current of tens of nA.
10	3IN+	input	Non-inverting (positive) input of op amp 3. High-impedance input; common-mode range includes V-.
11	VCC-	power_in	Negative (lowest) supply, or GND for single-supply operation. Common-mode input range includes this rail, enabling single-supply designs.
12	4IN+	input	Non-inverting (positive) input of op amp 4. High-impedance input; common-mode range includes V-.
13	4IN-	input	Inverting (negative) input of op amp 4. High-impedance input; typical input bias current of tens of nA.
14	4OUT	output	Output of op amp 4. Class-AB output stage capable of sourcing/sinking current; short-circuit protected.

Key specifications

Parameter	Value
Type	Quad general-purpose op-amp
Amplifiers	4 independent
Supply	3-32 V single or ±1.5-16 V split
Input range	includes ground (negative rail)
Gain-bandwidth	1.2 MHz
Slew rate	0.5 V/µs
Supply current	~0.7 mA (all four)
Package	SOIC-14

Ordering variants

Same part, different packaging or reel option.

LM324D (SOIC-14, tube)
LM324DR (SOIC-14, tape & reel)

CAD (KiCad official)

Symbol: Amplifier_Operational:LM324
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (65 pp, sha256 a4eda7c3a0236e96, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF