SN74LVC138APWR from Texas Instruments, 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	A	input	Address/select input A (LSB of 3-bit binary select). CMOS input, accepts 0 to 5.5 V regardless of VCC.
2	B	input	Address/select input B (middle bit of 3-bit binary select). CMOS input, accepts 0 to 5.5 V regardless of VCC.
3	C	input	Address/select input C (MSB of 3-bit binary select). CMOS input, accepts 0 to 5.5 V regardless of VCC.
4	G2A	input	Active-low enable input. All outputs are forced high (inactive) when G2A is high.
5	G2B	input	Active-low enable input. All outputs are forced high (inactive) when G2B is high.
6	G1	input	Active-high enable input. All outputs are forced high (inactive) when G1 is low.
7	Y7	output	Active-low decoded output 7. Asserted low when C=1, B=1, A=1 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V.
8	GND	power_in	Ground reference (0 V).
9	Y6	output	Active-low decoded output 6. Asserted low when C=1, B=1, A=0 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V.
10	Y5	output	Active-low decoded output 5. Asserted low when C=1, B=0, A=1 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V.
11	Y4	output	Active-low decoded output 4. Asserted low when C=1, B=0, A=0 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V.
12	Y3	output	Active-low decoded output 3. Asserted low when C=0, B=1, A=1 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V.
13	Y2	output	Active-low decoded output 2. Asserted low when C=0, B=1, A=0 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V.
14	Y1	output	Active-low decoded output 1. Asserted low when C=0, B=0, A=1 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V.
15	Y0	output	Active-low decoded output 0. Asserted low when C=0, B=0, A=0 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V.
16	VCC	power_in	Supply voltage, 1.65 V to 3.6 V operating range (absolute max 4.6 V).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74LVC138APWR
SN74LVC138APWRDR
SN74LVC138APWRD
SN74LVC138APWRRGYR
SN74LVC138APWRRGY
SN74LVC138APWRDBR
SN74LVC138APWRDB

CAD (KiCad official)

Symbol: SN74LVC138APWR
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: Texas Instruments datasheet (40 pp, sha256 ac45cc709217a5b8, 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