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u74hc138g-s16-r

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UTC Unisonic Tech Signal Switches / Encoders & Decoders / Multiplexers, SOP-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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U74HC138G-S16-R

UTC Unisonic Tech · Signal Switches / Encoders & Decoders / Multiplexers · SOP-16

U74HC138G-S16-R from UTC Unisonic Tech, in a SOP-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 A0 input Address input bit 0 (LSB). CMOS logic input, VIH ≥ 3.15V @ VCC=4.5V, VIL ≤ 1.35V @ VCC=4.5V. Input leakage ±100nA max at VCC=6V.
2 A1 input Address input bit 1. CMOS logic input used with A0 and A2 to select one of eight outputs. Input leakage ±100nA max at VCC=6V.
3 A2 input Address input bit 2 (MSB). CMOS logic input used with A0 and A1 to select one of eight outputs. Input leakage ±100nA max at VCC=6V.
4 ~E1 input Active-low chip enable 1. Must be held low to enable outputs; when high, all outputs are forced high (deselected). Can be used as a data input for demultiplexing.
5 ~E2 input Active-low chip enable 2. Must be held low to enable outputs; when high, all outputs are forced high (deselected). Can be used as a data input for demultiplexing.
6 E3 input Active-high chip enable 3. Must be held high to enable outputs; when low, all outputs are forced high (deselected). Can be used as a data input for demultiplexing.
7 ~Y7 output Active-low decoded output 7 (A2A1A0 = 111). Output drive 4mA @ VCC=5V. VOL ≤ 0.26V @ IOL=4mA, VCC=4.5V.
8 GND power_in Ground reference (0V). Return path for supply current; ICC ±50mA absolute max.
9 ~Y6 output Active-low decoded output 6 (A2A1A0 = 110). Output drive 4mA @ VCC=5V.
10 ~Y5 output Active-low decoded output 5 (A2A1A0 = 101). Output drive 4mA @ VCC=5V.
11 ~Y4 output Active-low decoded output 4 (A2A1A0 = 100). Output drive 4mA @ VCC=5V.
12 ~Y3 output Active-low decoded output 3 (A2A1A0 = 011). Output drive 4mA @ VCC=5V.
13 ~Y2 output Active-low decoded output 2 (A2A1A0 = 010). Output drive 4mA @ VCC=5V.
14 ~Y1 output Active-low decoded output 1 (A2A1A0 = 001). Output drive 4mA @ VCC=5V.
15 ~Y0 output Active-low decoded output 0 (A2A1A0 = 000). Output drive 4mA @ VCC=5V.
16 VCC power_in Positive supply voltage. Operating range 2.0V to 6.0V (typ 5.0V). Absolute max 7.0V. Quiescent current ICC ≤ 8μA @ VCC=6V.

Key specifications

Parameter Value
Manufacturer UTC Unisonic Tech
Package SOP-16
Category Logic
Pins 16

Ordering variants

  • U74HC138G-S16-R
  • U74HC138G-S16-RD16-T
  • U74HC138G-S16-RR16-R
  • U74HC138G-S16-RP16-R

CAD (KiCad official)

  • Symbol: U74HC138G-S16-R
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOP-16 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: UTC Unisonic Tech datasheet (None pp, sha256 fb68b50461d8d6aa, retrieved 2026-08-17, tier: lcsc)
  • 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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