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SN74HC148DR

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Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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SN74HC148DR

Texas Instruments · Signal Switches, Multiplexers, Decoders · SOIC-16

SN74HC148DR from Texas Instruments, in a SOIC-16. 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 4 input Active-low priority-encoded data input line 4.
2 5 input Active-low priority-encoded data input line 5.
3 6 input Active-low priority-encoded data input line 6.
4 7 input Active-low priority-encoded data input line 7 (highest priority).
5 EI input Active-low enable input; a high forces all data inputs to be ignored and outputs A0-A2, GS to the inactive high state, EO high, allowing cascading of multiple encoder stages.
6 A2 output Active-low binary address output, most significant bit, encoding the highest-priority active data input.
7 A1 output Active-low binary address output, middle bit, encoding the highest-priority active data input.
8 GND power_in Ground reference supply pin.
9 A0 output Active-low binary address output, least significant bit, encoding the highest-priority active data input.
10 0 input Active-low priority-encoded data input line 0 (lowest priority).
11 1 input Active-low priority-encoded data input line 1.
12 2 input Active-low priority-encoded data input line 2.
13 3 input Active-low priority-encoded data input line 3.
14 GS output Active-low group-select output that goes low whenever EI is low and at least one data input is active, indicating a valid encoding.
15 EO output Active-low enable output that goes low only when EI is low and all data inputs 0-7 are high, used to cascade to the next lower-priority encoder stage.
16 VCC power_in Positive supply voltage, recommended operating range 2V to 6V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-16
Category Logic
Pins 16

CAD (KiCad official)

  • Symbol: SN74HC148DR
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: sn74hc148dr-etched.step / sn74hc148dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74hc148dr.step / sn74hc148dr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (25 pp, sha256 d057975f445d3ee7, retrieved 2026-09-23, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-sonnet-5 (text+vision), consensus claude-opus-4-8 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF