SN74AHC541PWR 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	Active-low output enable 1. When OE1 is low AND OE2 is low, outputs Y1-Y8 follow inputs A1-A8; if either enable is high, all outputs go to high-impedance (Z).
2	A1	input	Channel 1 buffer input. CMOS input, overvoltage tolerant up to 5.5 V regardless of VCC.
3	A2	input	Channel 2 buffer input. CMOS input, overvoltage tolerant up to 5.5 V.
4	A3	input	Channel 3 buffer input. CMOS input, overvoltage tolerant up to 5.5 V.
5	A4	input	Channel 4 buffer input. CMOS input, overvoltage tolerant up to 5.5 V.
6	A5	input	Channel 5 buffer input. CMOS input, overvoltage tolerant up to 5.5 V.
7	A6	input	Channel 6 buffer input. CMOS input, overvoltage tolerant up to 5.5 V.
8	A7	input	Channel 7 buffer input. CMOS input, overvoltage tolerant up to 5.5 V.
9	A8	input	Channel 8 buffer input. CMOS input, overvoltage tolerant up to 5.5 V.
10	GND	power_in	Ground reference (0 V) for the device.
11	Y8	tri_state	Channel 8 buffer output (noninverting, 3-state). Drives ±8 mA at VCC=5 V; high-Z when either OE is high.
12	Y7	tri_state	Channel 7 buffer output (noninverting, 3-state). Drives ±8 mA at VCC=5 V; high-Z when either OE is high.
13	Y6	tri_state	Channel 6 buffer output (noninverting, 3-state). Drives ±8 mA at VCC=5 V; high-Z when either OE is high.
14	Y5	tri_state	Channel 5 buffer output (noninverting, 3-state). Drives ±8 mA at VCC=5 V; high-Z when either OE is high.
15	Y4	tri_state	Channel 4 buffer output (noninverting, 3-state). Drives ±8 mA at VCC=5 V; high-Z when either OE is high.
16	Y3	tri_state	Channel 3 buffer output (noninverting, 3-state). Drives ±8 mA at VCC=5 V; high-Z when either OE is high.
17	Y2	tri_state	Channel 2 buffer output (noninverting, 3-state). Drives ±8 mA at VCC=5 V; high-Z when either OE is high.
18	Y1	tri_state	Channel 1 buffer output (noninverting, 3-state). Drives ±8 mA at VCC=5 V; high-Z when either OE is high.
19	OE2	input	Active-low output enable 2. Must be low along with OE1 for outputs to be active; if high, all outputs go to high-impedance.
20	VCC	power_in	Positive supply voltage. Recommended operating range 2 V to 5.5 V; absolute maximum 7 V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74AHC541PWR
SN74AHC541PWRDB
SN74AHC541PWRDBR
SN74AHC541PWRDGV
SN74AHC541PWRDGVR
SN74AHC541PWRDW
SN74AHC541PWRDWR
SN74AHC541PWRN
SN74AHC541PWRNS
SN74AHC541PWRNSR
SN74AHC541PWRJ
SN74AHC541PWRW
SN74AHC541PWRFK

CAD (KiCad official)

Symbol: SN74AHC541PWR
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (42 pp, sha256 a432d1d66dbd0646, 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