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SN74HC151 8-to-1 Multiplexer

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by Ray

8-to-1 data selector/multiplexer with complementary outputs and an enable.

logicmultiplexerdata-selector74hctisoic-16
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SN74HC151

Texas Instruments · Multiplexer · SOIC-16

The SN74HC151 is an 8-to-1 data selector/multiplexer. Three select lines route one of eight data inputs to the output, and it provides both true (Y) and complementary (W) outputs plus an active-low enable. It is used for parallel-to-serial conversion and input selection.

Pinout

Pin Name Type Function
1 D3 input Data input 3. Routed to output Y (and inverted to W) when the select code CBA = 011 and strobe G is low.
2 D2 input Data input 2. Routed to output Y (and inverted to W) when the select code CBA = 010 and strobe G is low.
3 D1 input Data input 1. Routed to output Y (and inverted to W) when the select code CBA = 001 and strobe G is low.
4 D0 input Data input 0. Routed to output Y (and inverted to W) when the select code CBA = 000 and strobe G is low.
5 Y output True (non-inverted) data output. Presents the level of the selected D input when strobe G is low; forced low when G is high. Push-pull CMOS output rated ±6 mA at 5 V.
6 W output Inverted data output. Presents the complement of the selected D input when strobe G is low; forced high when G is high. Push-pull CMOS output rated ±6 mA at 5 V.
7 ~{G} input Active-low strobe (output enable). When low, the multiplexer output tracks the selected D input; when high, Y is forced low and W is forced high, disabling data selection.
8 GND power_in Ground reference (0 V). Connect to system ground.
9 C input Select input C (MSB of the 3-bit channel address). Together with B and A chooses which of the eight D inputs is routed to the outputs.
10 B input Select input B (middle bit of the 3-bit channel address). Together with C and A chooses which of the eight D inputs is routed to the outputs.
11 A input Select input A (LSB of the 3-bit channel address). Together with C and B chooses which of the eight D inputs is routed to the outputs.
12 D7 input Data input 7. Routed to output Y (and inverted to W) when the select code CBA = 111 and strobe G is low.
13 D6 input Data input 6. Routed to output Y (and inverted to W) when the select code CBA = 110 and strobe G is low.
14 D5 input Data input 5. Routed to output Y (and inverted to W) when the select code CBA = 101 and strobe G is low.
15 D4 input Data input 4. Routed to output Y (and inverted to W) when the select code CBA = 100 and strobe G is low.
16 VCC power_in Positive supply voltage. Recommended operating range 2 V to 6 V (5 V nominal). Bypass with a 0.1-µF ceramic capacitor close to the pin.

Key specifications

Parameter Value
Type 8-to-1 multiplexer / data selector
Logic family 74HC (CMOS)
Outputs True (Y) and complement (W)
Supply voltage 2 V to 6 V
Propagation delay 17 ns typ at 5 V
Operating temperature -40 C to 85 C

Ordering variants

Same part, different packaging or reel option.

  • SN74HC151D
  • SN74HC151N
  • SN74HC151NS
  • SN74HC151PW
  • SN74HC151J
  • SN74HC151FK

CAD (KiCad official)

  • Symbol: sn74hc151.kicad_sym
  • Footprint: sn74hc151.kicad_mod
  • 3D model: SOIC-16 body from KiCad Package_SO/SOIC-16_3.9x9.9mm_P1.27mm.

Provenance

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

  • Datasheet: Texas Instruments datasheet (28 pp, sha256 52a419ef9dca8855, 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