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SN74HC541 Octal Buffer

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by Ray

Octal buffer and line driver with 3-state outputs and non-inverting, same-side pinout.

logicbufferline-driver3-state74hctisoic-20
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SN74HC541

Texas Instruments · Buffer / Line Driver · SOIC-20

The SN74HC541 is an octal buffer and line driver with 3-state outputs. Unlike the 74HC244, its inputs sit on one side and outputs on the other for a flow-through layout, and both output-enables gate all eight buffers together. It is used to drive buses and buffer address or data lines.

Pinout

Pin Name Type Function
1 ~OE1 input Output enable 1 (active low). Both ~OE1 and ~OE2 must be low to enable the eight Y outputs; if either is high, all outputs are in the high-impedance state.
2 A1 input Channel 1 buffer input. CMOS logic input, VIH = 3.15 V min at VCC = 4.5 V; drives Y1 through a non-inverting 3-state buffer.
3 A2 input Channel 2 buffer input. Non-inverting logic input feeding the Y2 3-state output.
4 A3 input Channel 3 buffer input. Non-inverting logic input feeding the Y3 3-state output.
5 A4 input Channel 4 buffer input. Non-inverting logic input feeding the Y4 3-state output.
6 A5 input Channel 5 buffer input. Non-inverting logic input feeding the Y5 3-state output.
7 A6 input Channel 6 buffer input. Non-inverting logic input feeding the Y6 3-state output.
8 A7 input Channel 7 buffer input. Non-inverting logic input feeding the Y7 3-state output.
9 A8 input Channel 8 buffer input. Non-inverting logic input feeding the Y8 3-state output.
10 GND power_in Ground reference (0 V). Connect to system ground with a low-impedance path.
11 Y8 tri_state Channel 8 3-state output. Drives ±6 mA at VCC = 5 V when enabled (both ~OE inputs low); high-impedance when disabled.
12 Y7 tri_state Channel 7 3-state output. Drives ±6 mA at VCC = 5 V when enabled; high-impedance when disabled.
13 Y6 tri_state Channel 6 3-state output. Drives ±6 mA at VCC = 5 V when enabled; high-impedance when disabled.
14 Y5 tri_state Channel 5 3-state output. Drives ±6 mA at VCC = 5 V when enabled; high-impedance when disabled.
15 Y4 tri_state Channel 4 3-state output. Drives ±6 mA at VCC = 5 V when enabled; high-impedance when disabled.
16 Y3 tri_state Channel 3 3-state output. Drives ±6 mA at VCC = 5 V when enabled; high-impedance when disabled.
17 Y2 tri_state Channel 2 3-state output. Drives ±6 mA at VCC = 5 V when enabled; high-impedance when disabled.
18 Y1 tri_state Channel 1 3-state output. Drives ±6 mA at VCC = 5 V when enabled; high-impedance when disabled.
19 ~OE2 input Output enable 2 (active low). Both ~OE1 and ~OE2 must be low to enable the Y outputs; otherwise outputs go to the high-impedance state (NOR-gate enable).
20 VCC power_in Supply voltage. Operating range 2 V to 6 V (recommended, VCC = 5 V nominal). Decouple with a 100 nF ceramic capacitor placed close to the pin.

Key specifications

Parameter Value
Type Octal buffer / line driver, 3-state
Logic family 74HC (CMOS)
Configuration 8 non-inverting buffers, flow-through pinout
Supply voltage 2 V to 6 V
Output current +-6 mA at VCC = 4.5 V
Propagation delay 13 ns typ at 5 V
Operating temperature -40 C to 85 C

Ordering variants

Same part, different packaging or reel option.

  • SN74HC541DB
  • SN74HC541DW
  • SN74HC541N
  • SN74HC541NS
  • SN74HC541PW
  • SN74HC541J
  • SN74HC541FK

CAD (KiCad official)

  • Symbol: sn74hc541.kicad_sym
  • Footprint: sn74hc541.kicad_mod
  • 3D model: SOIC-20 wide body from KiCad Package_SO/SOIC-20W_7.5x12.8mm_P1.27mm.

Provenance

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

  • Datasheet: Texas Instruments datasheet (34 pp, sha256 9d9bc06ae10f8f37, 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