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74HC138T

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by Ray

Shenzhen Fuman Signal Switches / Encoders & Decoders / Multiplexers, TSSOP-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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74HC138T

Shenzhen Fuman · Signal Switches / Encoders & Decoders / Multiplexers · TSSOP-16

74HC138T from Shenzhen Fuman, in a TSSOP-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). Binary-weighted address input, together with A1/A2 selects one of eight outputs when the chip is enabled.
2 A1 input Address input bit 1. Binary-weighted address input used to select one of eight outputs.
3 A2 input Address input bit 2 (MSB). Binary-weighted address input used to select one of eight outputs.
4 E1 input Enable input, active-low. All Y outputs are forced HIGH (deasserted) when E1 = H. Must be LOW (together with E2 = L and E3 = H) to enable decoding.
5 E2 input Enable input, active-low. All Y outputs are forced HIGH when E2 = H. Must be LOW to enable decoding.
6 E3 input Enable input, active-high. All Y outputs are forced HIGH when E3 = L. Must be HIGH to enable decoding.
7 Y7 output Decoder output 7, active-low. Driven LOW when enabled and address A2:A0 = 111; otherwise HIGH.
8 GND power_in Ground reference (0 V).
9 Y6 output Decoder output 6, active-low. Driven LOW when enabled and address A2:A0 = 110; otherwise HIGH.
10 Y5 output Decoder output 5, active-low. Driven LOW when enabled and address A2:A0 = 101; otherwise HIGH.
11 Y4 output Decoder output 4, active-low. Driven LOW when enabled and address A2:A0 = 100; otherwise HIGH.
12 Y3 output Decoder output 3, active-low. Driven LOW when enabled and address A2:A0 = 011; otherwise HIGH.
13 Y2 output Decoder output 2, active-low. Driven LOW when enabled and address A2:A0 = 010; otherwise HIGH.
14 Y1 output Decoder output 1, active-low. Driven LOW when enabled and address A2:A0 = 001; otherwise HIGH.
15 Y0 output Decoder output 0, active-low. Driven LOW when enabled and address A2:A0 = 000; otherwise HIGH.
16 VCC power_in Positive supply, 3 V to 5 V (typical CMOS operating range for 74HC family).

Key specifications

Parameter Value
Manufacturer Shenzhen Fuman
Package TSSOP-16
Category Logic
Pins 16

CAD (KiCad official)

  • Symbol: 74HC138T
  • Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
  • 3D model: TSSOP-16 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Shenzhen Fuman datasheet (7 pp, sha256 82e487e2e1561e42, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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