SN74HC139PWR 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	1G	input	Decoder 1 active-low enable (strobe) input. When high, all 1Y outputs are forced high; when low, the selected 1Y output goes low.
2	1A	input	Decoder 1 select input A (LSB of the 2-bit select). CMOS logic input, 1 µA max input current.
3	1B	input	Decoder 1 select input B (MSB of the 2-bit select). CMOS logic input, 1 µA max input current.
4	1Y0	output	Decoder 1 active-low output 0 (selected when B=L, A=L and 1G=L). Can drive up to 10 LSTTL loads; ±4 mA output drive at 5 V.
5	1Y1	output	Decoder 1 active-low output 1 (selected when B=L, A=H and 1G=L). ±4 mA output drive at 5 V.
6	1Y2	output	Decoder 1 active-low output 2 (selected when B=H, A=L and 1G=L). ±4 mA output drive at 5 V.
7	1Y3	output	Decoder 1 active-low output 3 (selected when B=H, A=H and 1G=L). ±4 mA output drive at 5 V.
8	GND	power_in	Ground reference (0 V). Common return for VCC supply current.
9	2Y3	output	Decoder 2 active-low output 3 (selected when B=H, A=H and 2G=L). ±4 mA output drive at 5 V.
10	2Y2	output	Decoder 2 active-low output 2 (selected when B=H, A=L and 2G=L). ±4 mA output drive at 5 V.
11	2Y1	output	Decoder 2 active-low output 1 (selected when B=L, A=H and 2G=L). ±4 mA output drive at 5 V.
12	2Y0	output	Decoder 2 active-low output 0 (selected when B=L, A=L and 2G=L). ±4 mA output drive at 5 V.
13	2B	input	Decoder 2 select input B (MSB of the 2-bit select). CMOS logic input, 1 µA max input current.
14	2A	input	Decoder 2 select input A (LSB of the 2-bit select). CMOS logic input, 1 µA max input current.
15	2G	input	Decoder 2 active-low enable (strobe) input. When high, all 2Y outputs are forced high; when low, the selected 2Y output goes low.
16	VCC	power_in	Positive supply voltage input. Recommended operating range 2 V to 6 V; absolute max 7 V. Bypass with 0.1 µF ceramic capacitor placed close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74HC139PWR
SN74HC139PWRD
SN74HC139PWRDR
SN74HC139PWRDT
SN74HC139PWRDB
SN74HC139PWRDBR
SN74HC139PWRN
SN74HC139PWRNE4
SN74HC139PWRNS
SN74HC139PWRNSR
SN74HC139PWRJ
SN74HC139PWRW
SN74HC139PWRFK

CAD (KiCad official)

Symbol: SN74HC139PWR
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 (30 pp, sha256 7bed90a2f9c2fe80, 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