SN74ACT244PWR from Texas Instruments, in a TSSOP-20. 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	1OE	input	Active-low output enable for buffer bank 1 (1Y1-1Y4). When low, 1A inputs pass to 1Y outputs; when high, 1Y outputs are Hi-Z. TTL-compatible input, VIH >= 2 V, VIL <= 0.8 V at 5 V VCC.
2	1A1	input	Bank 1 buffer channel 1 data input. TTL-compatible, non-inverting to 1Y1 when 1OE is low. Must not exceed VCC.
3	2Y4	tri_state	Bank 2 buffer channel 4 3-state output. Drives non-inverted 2A4 data when 2OE is low; Hi-Z when 2OE is high. Rated 24 mA source/sink at 5 V VCC.
4	1A2	input	Bank 1 buffer channel 2 data input. TTL-compatible, non-inverting to 1Y2 when 1OE is low.
5	2Y3	tri_state	Bank 2 buffer channel 3 3-state output. Drives non-inverted 2A3 data when 2OE is low; Hi-Z when 2OE is high. Rated 24 mA source/sink at 5 V VCC.
6	1A3	input	Bank 1 buffer channel 3 data input. TTL-compatible, non-inverting to 1Y3 when 1OE is low.
7	2Y2	tri_state	Bank 2 buffer channel 2 3-state output. Drives non-inverted 2A2 data when 2OE is low; Hi-Z when 2OE is high. Rated 24 mA source/sink at 5 V VCC.
8	1A4	input	Bank 1 buffer channel 4 data input. TTL-compatible, non-inverting to 1Y4 when 1OE is low.
9	2Y1	tri_state	Bank 2 buffer channel 1 3-state output. Drives non-inverted 2A1 data when 2OE is low; Hi-Z when 2OE is high. Rated 24 mA source/sink at 5 V VCC.
10	GND	power_in	Device ground reference. Connect to 0 V rail with a local decoupling cap between VCC (pin 20) and GND.
11	2A1	input	Bank 2 buffer channel 1 data input. TTL-compatible, non-inverting to 2Y1 when 2OE is low.
12	1Y4	tri_state	Bank 1 buffer channel 4 3-state output. Drives non-inverted 1A4 data when 1OE is low; Hi-Z when 1OE is high. Rated 24 mA source/sink at 5 V VCC.
13	2A2	input	Bank 2 buffer channel 2 data input. TTL-compatible, non-inverting to 2Y2 when 2OE is low.
14	1Y3	tri_state	Bank 1 buffer channel 3 3-state output. Drives non-inverted 1A3 data when 1OE is low; Hi-Z when 1OE is high. Rated 24 mA source/sink at 5 V VCC.
15	2A3	input	Bank 2 buffer channel 3 data input. TTL-compatible, non-inverting to 2Y3 when 2OE is low.
16	1Y2	tri_state	Bank 1 buffer channel 2 3-state output. Drives non-inverted 1A2 data when 1OE is low; Hi-Z when 1OE is high. Rated 24 mA source/sink at 5 V VCC.
17	2A4	input	Bank 2 buffer channel 4 data input. TTL-compatible, non-inverting to 2Y4 when 2OE is low.
18	1Y1	tri_state	Bank 1 buffer channel 1 3-state output. Drives non-inverted 1A1 data when 1OE is low; Hi-Z when 1OE is high. Rated 24 mA source/sink at 5 V VCC.
19	2OE	input	Active-low output enable for buffer bank 2 (2Y1-2Y4). When low, 2A inputs pass to 2Y outputs; when high, 2Y outputs are Hi-Z. Tie to VCC via pullup during power-up/down for guaranteed Hi-Z.
20	VCC	power_in	Positive supply, 4.5 V to 5.5 V recommended operating range (7 V absolute max). Bypass with a 0.1 uF ceramic capacitor to GND close to the pin.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-20
Category	Logic
Pins	20

Ordering variants

Same part, different packaging or reel option.

SN74ACT244PWR
SN74ACT244PWRDGS
SN74ACT244PWRDGSR
SN74ACT244PWRDB
SN74ACT244PWRDBR
SN74ACT244PWRDW
SN74ACT244PWRDWR
SN74ACT244PWRN
SN74ACT244PWRNS
SN74ACT244PWRNSR
SN74ACT244PWRRKS
SN74ACT244PWRRKSR
SN74ACT244PWRJ
SN74ACT244PWRW
SN74ACT244PWRFK

CAD (KiCad official)

Symbol: SN74ACT244PWR
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74act244pwr.step`	267 KB	You want the bare part, or you mark your own boards.
`sn74act244pwr-etched.step`	2.8 MB	You want the part with `SN74ACT244PWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 726 faces against 327 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: Texas Instruments datasheet (41 pp, sha256 01c87f92eb3778ab, 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