SN74LVC574APWR 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	OE	input	Active-low output enable (OE). When low, the eight Q outputs are enabled; when high, all Q outputs are placed in the high-impedance (3-state) condition. Does not affect internal flip-flop operation. Tie to VCC through a pullup during power-up/down to guarantee Hi-Z.
2	1D	input	Data input to flip-flop 1. Sampled on the rising edge of CLK and transferred to output 1Q. Inputs accept voltages up to 5.5 V.
3	2D	input	Data input to flip-flop 2. Sampled on the rising edge of CLK and transferred to output 2Q.
4	3D	input	Data input to flip-flop 3. Sampled on the rising edge of CLK and transferred to output 3Q.
5	4D	input	Data input to flip-flop 4. Sampled on the rising edge of CLK and transferred to output 4Q.
6	5D	input	Data input to flip-flop 5. Sampled on the rising edge of CLK and transferred to output 5Q.
7	6D	input	Data input to flip-flop 6. Sampled on the rising edge of CLK and transferred to output 6Q.
8	7D	input	Data input to flip-flop 7. Sampled on the rising edge of CLK and transferred to output 7Q.
9	8D	input	Data input to flip-flop 8. Sampled on the rising edge of CLK and transferred to output 8Q.
10	GND	power_in	Ground reference (0 V). Common return for VCC and all input/output signals.
11	CLK	input	Clock input common to all eight flip-flops. Data on D inputs is transferred to Q outputs on the rising edge (positive transition) of CLK. Minimum pulse width 3.3 ns at VCC = 3.3 V; fmax up to 150 MHz.
12	8Q	tri_state	3-state output of flip-flop 8. Reflects last clocked value of 8D when OE is low; Hi-Z when OE is high. Drive capability of ±24 mA at VCC = 3 V.
13	7Q	tri_state	3-state output of flip-flop 7. Reflects last clocked value of 7D when OE is low; Hi-Z when OE is high.
14	6Q	tri_state	3-state output of flip-flop 6. Reflects last clocked value of 6D when OE is low; Hi-Z when OE is high.
15	5Q	tri_state	3-state output of flip-flop 5. Reflects last clocked value of 5D when OE is low; Hi-Z when OE is high.
16	4Q	tri_state	3-state output of flip-flop 4. Reflects last clocked value of 4D when OE is low; Hi-Z when OE is high.
17	3Q	tri_state	3-state output of flip-flop 3. Reflects last clocked value of 3D when OE is low; Hi-Z when OE is high.
18	2Q	tri_state	3-state output of flip-flop 2. Reflects last clocked value of 2D when OE is low; Hi-Z when OE is high.
19	1Q	tri_state	3-state output of flip-flop 1. Reflects last clocked value of 1D when OE is low; Hi-Z when OE is high.
20	VCC	power_in	Positive supply voltage, 1.65 V to 3.6 V operating range (SN74LVC574A). Decouple with a local bypass capacitor to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74LVC574APWR
SN74LVC574APWRAPWT
SN74LVC574APWRADW
SN74LVC574APWRADWR
SN74LVC574APWRADBR
SN74LVC574APWRADGVR
SN74LVC574APWRANSR
SN74LVC574APWRAN
SN74LVC574APWRARGYR
SN74LVC574APWRAGQNR
SN74LVC574APWRAZQNR
SN74LVC574APWRFK
SN74LVC574APWRJ
SN74LVC574APWRW

CAD (KiCad official)

Symbol: SN74LVC574APWR
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
`sn74lvc574apwr.step`	267 KB	You want the bare part, or you mark your own boards.
`sn74lvc574apwr-etched.step`	2.8 MB	You want the part with `SN74LVC574APWR` 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 (35 pp, sha256 e6aad666cf80743a, 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