AM26LS31CDR from Texas Instruments, in a SOIC-16. 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	1A	input	Driver 1 single-ended TTL-compatible data input. Drives complementary outputs 1Y and 1Z when enabled. VIH >= 2 V, VIL <= 0.8 V.
2	1Y	tri_state	Driver 1 non-inverting differential output. 3-state, complementary to 1Z. IOH = -20 mA, VOH >= 2.5 V; goes high-Z when disabled or in power-off.
3	1Z	tri_state	Driver 1 inverting differential output. 3-state, complementary to 1Y. IOL = 20 mA, VOL <= 0.5 V; goes high-Z when disabled or in power-off.
4	G	input	Active-high output enable input, common to all four drivers. Outputs are enabled when G = H AND G-bar = L; otherwise outputs are high impedance.
5	2Z	tri_state	Driver 2 inverting differential output. 3-state, complementary to 2Y.
6	2Y	tri_state	Driver 2 non-inverting differential output. 3-state, complementary to 2Z.
7	2A	input	Driver 2 single-ended TTL-compatible data input.
8	GND	power_in	Device ground reference. Connect to system 0 V.
9	3A	input	Driver 3 single-ended TTL-compatible data input.
10	3Y	tri_state	Driver 3 non-inverting differential output. 3-state, complementary to 3Z.
11	3Z	tri_state	Driver 3 inverting differential output. 3-state, complementary to 3Y.
12	G_N	input	Active-low output enable input (G-bar), common to all four drivers. Outputs are enabled when G-bar = L AND G = H; otherwise outputs are high impedance.
13	4Z	tri_state	Driver 4 inverting differential output. 3-state, complementary to 4Y.
14	4Y	tri_state	Driver 4 non-inverting differential output. 3-state, complementary to 4Z.
15	4A	input	Driver 4 single-ended TTL-compatible data input.
16	VCC	power_in	Positive supply input. 4.75-5.25 V (C-suffix) or 4.5-5.5 V (M-suffix); absolute max 7 V. Typical ICC = 32 mA (all outputs disabled).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-16
Category	Logic
Pins	16

Ordering variants

Same part, different packaging or reel option.

AM26LS31CDR
AM26LS31CDRCDB
AM26LS31CDRCDBR
AM26LS31CDRCN
AM26LS31CDRIN
AM26LS31CDRMJ
AM26LS31CDRCNS
AM26LS31CDRCNSR
AM26LS31CDRMW
AM26LS31CDRMFKB

CAD (KiCad official)

Symbol: AM26LS31CDR
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`am26ls31cdr.step`	217 KB	You want the bare part, or you mark your own boards.
`am26ls31cdr-etched.step`	2.7 MB	You want the part with `AM26LS31CDR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 670 faces against 267 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 (23 pp, sha256 d9755d5c7117a6de, 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