SN74LS74ADR from Texas Instruments, in a SOIC-14. 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	1CLR	input	Asynchronous active-low clear (reset) input for flip-flop 1. Forces 1Q low regardless of clock. TTL-compatible input.
2	1D	input	Data input for flip-flop 1. Sampled on the rising edge of 1CLK and transferred to 1Q. TTL-compatible input.
3	1CLK	input	Clock input for flip-flop 1. Positive-edge-triggered: 1D is transferred to 1Q on the low-to-high transition.
4	1PRE	input	Asynchronous active-low preset (set) input for flip-flop 1. Forces 1Q high regardless of clock. TTL-compatible input.
5	1Q	output	True (non-inverted) output of flip-flop 1. Follows 1D after the rising edge of 1CLK; forced high by 1PRE, low by 1CLR.
6	1Q_N	output	Complementary (inverted) output of flip-flop 1. Always logical complement of 1Q in normal operation.
7	GND	power_in	Ground reference (0 V) for the device.
8	2Q_N	output	Complementary (inverted) output of flip-flop 2. Always logical complement of 2Q in normal operation.
9	2Q	output	True (non-inverted) output of flip-flop 2. Follows 2D after the rising edge of 2CLK; forced high by 2PRE, low by 2CLR.
10	2PRE	input	Asynchronous active-low preset (set) input for flip-flop 2. Forces 2Q high regardless of clock.
11	2CLK	input	Clock input for flip-flop 2. Positive-edge-triggered: 2D is transferred to 2Q on the low-to-high transition.
12	2D	input	Data input for flip-flop 2. Sampled on the rising edge of 2CLK and transferred to 2Q.
13	2CLR	input	Asynchronous active-low clear (reset) input for flip-flop 2. Forces 2Q low regardless of clock.
14	VCC	power_in	Positive supply voltage. Recommended operating range 4.75 V to 5.25 V for the SN74LS74A.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-14
Category	Logic
Pins	14

Ordering variants

Same part, different packaging or reel option.

SN74LS74ADR
SN74LS74ADRD
SN74LS74ADRN
SN74LS74ADRNSR

CAD (KiCad official)

Symbol: SN74LS74ADR
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (30 pp, sha256 d1f81fe112b34dd0, 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