LM224QT from STMicroelectronics, in a TQFN-16-EP(3x3). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	IN1+	input	Non-inverting input of op-amp 1. Common-mode input voltage range extends from ground (VCC-) up to VCC+ − 1.5 V at 25 °C.
2	VCC+	power_in	Positive supply rail. Single supply: 3 V to 30 V referenced to VCC-; dual supply: +1.5 V to +15 V referenced to ground. Absolute maximum supply is ±16 V or 32 V total.
3	NC	unconnected	No internal connection. Leave floating or tie to a static net.
4	IN2+	input	Non-inverting input of op-amp 2. Input bias current typ. 20 nA, input offset current typ. 2 nA.
5	IN2-	input	Inverting input of op-amp 2. Input offset voltage 5 mV max (LM224).
6	OUT2	output	Output of op-amp 2. Internally frequency-compensated; output short-circuit current typ. 40 mA; output short-circuit to ground is safe indefinitely for VCC ≤ 15 V.
7	OUT3	output	Output of op-amp 3. Internally frequency-compensated; large voltage gain typ. 100 dB.
8	IN3-	input	Inverting input of op-amp 3.
9	IN3+	input	Non-inverting input of op-amp 3. Common-mode input voltage range 0 V to VCC-1.5 V @ 25 °C.
10	NC	unconnected	No internal connection. Leave floating or tie to a static net.
11	VCC-	power_in	Negative supply / ground. In single-supply operation this pin is tied to system ground; in split-supply operation it is the negative rail (down to -15 V). Absolute maximum ±16 V.
12	IN4+	input	Non-inverting input of op-amp 4.
13	IN4-	input	Inverting input of op-amp 4.
14	OUT4	output	Output of op-amp 4. Internally frequency-compensated; output short-circuit protected.
15	OUT1	output	Output of op-amp 1. Internally frequency-compensated.
16	IN1-	input	Inverting input of op-amp 1.
17	EP	passive	Exposed thermal pad on package underside. Per Figure 1 note 1, may be connected to VCC- or left floating. Connecting to VCC- improves thermal performance (QFN16 3x3 Rth(j-a) = 45 °C/W).

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	TQFN-16-EP(3x3)
Category	Op-amp/Cmp
Pins	17

Ordering variants

Same part, different packaging or reel option.

LM224QT
LM224DT
LM224ADT
LM224WDT
LM224PT
LM224APT

CAD (KiCad official)

Symbol: LM224QT
Footprint: Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm
3D model: TQFN-16-EP(3x3) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm224qt.step`	190 KB	You want the bare part, or you mark your own boards.
`lm224qt-etched.step`	1.3 MB	You want the part with `LM224QT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 341 faces against 110 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: STMicroelectronics datasheet (22 pp, sha256 c1aa97669d6ca9c8, 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