MC74HC126ADR2G from onsemi, in a SOIC-14. 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	OE1	input	Active-high output enable for buffer 1. When high, output Y1 follows input A1; when low, Y1 is in high-impedance state.
2	A1	input	Data input for buffer 1. CMOS-compatible logic input, buffered non-inverting to output Y1.
3	Y1	tri_state	3-state noninverting buffer output 1. Drives up to 15 LSTTL loads; high-impedance when OE1 is low.
4	OE2	input	Active-high output enable for buffer 2. When high, output Y2 follows input A2; when low, Y2 is in high-impedance state.
5	A2	input	Data input for buffer 2. CMOS-compatible logic input, buffered non-inverting to output Y2.
6	Y2	tri_state	3-state noninverting buffer output 2. Drives up to 15 LSTTL loads; high-impedance when OE2 is low.
7	GND	power_in	Ground reference (0 V). Common return for supply and I/O.
8	Y3	tri_state	3-state noninverting buffer output 3. Drives up to 15 LSTTL loads; high-impedance when OE3 is low.
9	A3	input	Data input for buffer 3. CMOS-compatible logic input, buffered non-inverting to output Y3.
10	OE3	input	Active-high output enable for buffer 3. When high, output Y3 follows input A3; when low, Y3 is in high-impedance state.
11	Y4	tri_state	3-state noninverting buffer output 4. Drives up to 15 LSTTL loads; high-impedance when OE4 is low.
12	A4	input	Data input for buffer 4. CMOS-compatible logic input, buffered non-inverting to output Y4.
13	OE4	input	Active-high output enable for buffer 4. When high, output Y4 follows input A4; when low, Y4 is in high-impedance state.
14	VCC	power_in	Positive supply voltage, 2.0 V to 6.0 V (absolute max 7.0 V). Bypass with a 0.1 uF ceramic capacitor close to the pin.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOIC-14
Category	Logic
Pins	14

Ordering variants

Same part, different packaging or reel option.

MC74HC126ADG
MC74HC126ADR2G
MC74HC126ADR2GNLV74HC126ADR2G
MC74HC126ADTR2G
MC74HC126ADR2GNLV74HC126ADTR2G

CAD (KiCad official)

Symbol: MC74HC126ADR2G
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mc74hc126adr2g.step`	195 KB	You want the bare part, or you mark your own boards.
`mc74hc126adr2g-etched.step`	2.8 MB	You want the part with `MC74HC126ADR2G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 716 faces against 237 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: onsemi datasheet (9 pp, sha256 7fc74019b728976b, 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