SN74HC594DR 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	QB	output	Storage register parallel output B. High-current CMOS output driven from bit B of the 8-bit D-type storage register; typical drive ±6 mA at VCC = 5 V.
2	QC	output	Storage register parallel output C. High-current CMOS output driven from bit C of the 8-bit D-type storage register.
3	QD	output	Storage register parallel output D. High-current CMOS output driven from bit D of the 8-bit D-type storage register.
4	QE	output	Storage register parallel output E. High-current CMOS output driven from bit E of the 8-bit D-type storage register.
5	QF	output	Storage register parallel output F. High-current CMOS output driven from bit F of the 8-bit D-type storage register.
6	QG	output	Storage register parallel output G. High-current CMOS output driven from bit G of the 8-bit D-type storage register.
7	QH	output	Storage register parallel output H (last bit). High-current CMOS output driven from bit H of the 8-bit D-type storage register.
8	GND	power_in	Ground reference (0 V) for the device.
9	QH'	output	Serial output from the last stage of the shift register (QH inverted / cascade output). Used to cascade multiple SN74HC594 devices for shift registers wider than 8 bits.
10	SRCLR	input	Active-low shift-register clear. Asynchronously resets all bits of the 8-bit shift register to 0 when driven low, overriding SRCLK.
11	SRCLK	input	Shift-register clock. On each positive (rising) edge, the value on SER is shifted into the first bit of the 8-bit shift register.
12	RCLK	input	Storage-register (output latch) clock. Positive edge transfers the contents of the shift register into the 8-bit D-type storage register that drives QA-QH.
13	RCLR	input	Active-low storage-register clear. Asynchronously resets all bits of the 8-bit output storage register to 0 when driven low, overriding RCLK.
14	SER	input	Serial data input. Sampled on the rising edge of SRCLK and shifted into the first bit of the 8-bit shift register.
15	QA	output	Storage register parallel output A (first bit). High-current CMOS output driven from bit A of the 8-bit D-type storage register.
16	VCC	power_in	Positive supply voltage, 2 V to 6 V recommended operating range (absolute max 7 V). Bypass with a 0.1 µF ceramic capacitor close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74HC594DR
SN74HC594DRD
SN74HC594DRDW
SN74HC594DRDWR
SN74HC594DRN
SN74HC594DRNE

CAD (KiCad official)

Symbol: SN74HC594DR
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (28 pp, sha256 62c6a3d5a2bda363, 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