74HC123PW from Nexperia, in a TSSOP-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	Negative-edge triggered input for monostable 1 (active-LOW trigger, Schmitt-trigger input).
2	1B	input	Positive-edge triggered input for monostable 1 (Schmitt-trigger input).
3	1RD	input	Direct reset input for monostable 1 - active LOW terminates the output pulse; also acts as a positive-edge triggered input.
4	1Q_N	output	Active-LOW (inverted) output for monostable 1. Goes LOW during the programmed output pulse.
5	2Q	output	Active-HIGH output for monostable 2. Goes HIGH during the programmed output pulse.
6	2CEXT	passive	External timing capacitor connection for monostable 2. Together with 2REXT/CEXT sets the output pulse width.
7	2REXT/CEXT	passive	External timing resistor and capacitor connection for monostable 2. REXT ties to VCC through the timing resistor; CEXT ties between this pin and 2CEXT.
8	GND	power_in	Ground reference (0 V).
9	2A	input	Negative-edge triggered input for monostable 2 (active-LOW trigger, Schmitt-trigger input).
10	2B	input	Positive-edge triggered input for monostable 2 (Schmitt-trigger input).
11	2RD	input	Direct reset input for monostable 2 - active LOW terminates the output pulse; also acts as a positive-edge triggered input.
12	2Q_N	output	Active-LOW (inverted) output for monostable 2. Goes LOW during the programmed output pulse.
13	1Q	output	Active-HIGH output for monostable 1. Goes HIGH during the programmed output pulse.
14	1CEXT	passive	External timing capacitor connection for monostable 1. Together with 1REXT/CEXT sets the output pulse width.
15	1REXT/CEXT	passive	External timing resistor and capacitor connection for monostable 1. REXT ties to VCC through the timing resistor; CEXT ties between this pin and 1CEXT.
16	VCC	power_in	Positive supply voltage. Operating range 2.0 V to 6.0 V (74HC123) or 4.5 V to 5.5 V (74HCT123).

Key specifications

Parameter	Value
Manufacturer	Nexperia
Package	TSSOP-16
Category	Logic
Pins	16

Ordering variants

74HC123PW
74HC123PWD
74HC123PWBQ

CAD (KiCad official)

Symbol: 74HC123PW
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`74hc123pw.step`	205 KB	You want the bare part, or you mark your own boards.
`74hc123pw-etched.step`	2.1 MB	You want the part with `74HC123PW` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 534 faces against 255 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: Nexperia datasheet (20 pp, sha256 0b5ba7a32cf4830a, 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