SN74LVC541APWR 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	OE1	input	Output enable 1, active low. Must be low (together with OE2) to enable the eight Y outputs; when high, all Y outputs are placed in the high-impedance (3-state) mode.
2	A1	input	Input for channel 1 buffer. CMOS logic input, accepts up to 5.5V regardless of VCC (mixed-voltage translation supported down to VCC = 1.65V).
3	A2	input	Input for channel 2 buffer. CMOS logic input, accepts up to 5.5V regardless of VCC.
4	A3	input	Input for channel 3 buffer. CMOS logic input, accepts up to 5.5V regardless of VCC.
5	A4	input	Input for channel 4 buffer. CMOS logic input, accepts up to 5.5V regardless of VCC.
6	A5	input	Input for channel 5 buffer. CMOS logic input, accepts up to 5.5V regardless of VCC.
7	A6	input	Input for channel 6 buffer. CMOS logic input, accepts up to 5.5V regardless of VCC.
8	A7	input	Input for channel 7 buffer. CMOS logic input, accepts up to 5.5V regardless of VCC.
9	A8	input	Input for channel 8 buffer. CMOS logic input, accepts up to 5.5V regardless of VCC.
10	GND	power_in	Ground reference (0 V) for the device.
11	Y8	tri_state	3-state output for channel 8. Drives IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V; enters high-Z when either OE1 or OE2 is high.
12	Y7	tri_state	3-state output for channel 7. Drives IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V; enters high-Z when either OE1 or OE2 is high.
13	Y6	tri_state	3-state output for channel 6. Drives IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V; enters high-Z when either OE1 or OE2 is high.
14	Y5	tri_state	3-state output for channel 5. Drives IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V; enters high-Z when either OE1 or OE2 is high.
15	Y4	tri_state	3-state output for channel 4. Drives IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V; enters high-Z when either OE1 or OE2 is high.
16	Y3	tri_state	3-state output for channel 3. Drives IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V; enters high-Z when either OE1 or OE2 is high.
17	Y2	tri_state	3-state output for channel 2. Drives IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V; enters high-Z when either OE1 or OE2 is high.
18	Y1	tri_state	3-state output for channel 1. Drives IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V; enters high-Z when either OE1 or OE2 is high.
19	OE2	input	Output enable 2, active low. Must be low (together with OE1) to enable the eight Y outputs; when high, all Y outputs are placed in the high-impedance (3-state) mode.
20	VCC	power_in	Positive supply. Operating range 1.65 V to 3.6 V (SN74LVC541A); absolute maximum 6.5 V. Bypass with a local decoupling 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.

SN74LVC541APWR
SN74LVC541APWRDW
SN74LVC541APWRDWR
SN74LVC541APWRDB
SN74LVC541APWRDBR
SN74LVC541APWRNS
SN74LVC541APWRNSR
SN74LVC541APWRDGS
SN74LVC541APWRDGSR
SN74LVC541APWRDGV
SN74LVC541APWRDGVR
SN74LVC541APWRRKS
SN74LVC541APWRRKSR
SN74LVC541APWRRGY
SN74LVC541APWRRGYR
SN74LVC541APWRJ
SN74LVC541APWRW
SN74LVC541APWRFK

CAD (KiCad official)

Symbol: SN74LVC541APWR
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
`sn74lvc541apwr.step`	267 KB	You want the bare part, or you mark your own boards.
`sn74lvc541apwr-etched.step`	2.8 MB	You want the part with `SN74LVC541APWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 734 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 (46 pp, sha256 044fc874741c11f1, 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