MC74ACT125DR2G 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	~A0	input	Active-low output enable for buffer 0. When low the buffer drives O0 with B0; when high O0 is placed in the high-impedance (3-state) state. TTL-compatible input threshold (VIH >= 2.0 V, VIL <= 0.8 V) with input leakage +/-1 uA max.
2	B0	input	Data input for buffer 0. Drives O0 when the corresponding output enable ~A0 is low; ignored (X) when ~A0 is high (output high-Z). TTL-compatible input threshold on the 'ACT variant.
3	O0	tri_state	3-state buffered output for channel 0. Follows B0 when ~A0 is low; high-Z when ~A0 is high. Drive capability +/-24 mA at VCC = 4.5 V (IOH/IOL guaranteed limits).
4	~A1	input	Active-low output enable for buffer 1. Low = enable (O1 = B1); high = high-Z output.
5	B1	input	Data input for buffer 1. Passed to O1 when ~A1 is low.
6	O1	tri_state	3-state buffered output for channel 1. Drives +/-24 mA; high-Z when ~A1 is high.
7	GND	power_in	Ground reference (0 V) for the device. All input/output voltages are referenced to this pin.
8	O3	tri_state	3-state buffered output for channel 3. Follows B3 when ~A3 is low; high-Z when ~A3 is high.
9	B3	input	Data input for buffer 3. Passed to O3 when ~A3 is low.
10	~A3	input	Active-low output enable for buffer 3. Low = enable (O3 = B3); high = high-Z output.
11	O2	tri_state	3-state buffered output for channel 2. Follows B2 when ~A2 is low; high-Z when ~A2 is high.
12	B2	input	Data input for buffer 2. Passed to O2 when ~A2 is low.
13	~A2	input	Active-low output enable for buffer 2. Low = enable (O2 = B2); high = high-Z output.
14	VCC	power_in	Positive supply. Recommended 4.5-5.5 V for the 'ACT variant (absolute max 7.0 V). Bypass with a 0.1 uF ceramic near the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MC74ACT125DR2G
MC74ACT125DR2GDG
MC74ACT125DR2GDTR2G

CAD (KiCad official)

Symbol: MC74ACT125DR2G
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D, STEP)

Provenance

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

Datasheet: onsemi datasheet (8 pp, sha256 a8b1cd5809fcaf46, 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