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SN74HC574NSR

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by Ray

Texas Instruments Flip Flops, SOIC-20-208mil. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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SN74HC574NSR

Texas Instruments · Flip Flops · SOIC-20-208mil

SN74HC574NSR from Texas Instruments, in a SOIC-20-208mil. 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 OE input Active-low 3-state output-enable. When OE is low the eight Q outputs drive their stored levels; when OE is high all Q outputs enter the high-impedance state. OE does not affect the internal storage of the flip-flops.
2 1D input Data input to flip-flop 1. Captured on the low-to-high transition of CLK. CMOS input, IIH/IIL ≤ ±1 µA typ.
3 2D input Data input to flip-flop 2. Captured on the low-to-high transition of CLK.
4 3D input Data input to flip-flop 3. Captured on the low-to-high transition of CLK.
5 4D input Data input to flip-flop 4. Captured on the low-to-high transition of CLK.
6 5D input Data input to flip-flop 5. Captured on the low-to-high transition of CLK.
7 6D input Data input to flip-flop 6. Captured on the low-to-high transition of CLK.
8 7D input Data input to flip-flop 7. Captured on the low-to-high transition of CLK.
9 8D input Data input to flip-flop 8. Captured on the low-to-high transition of CLK.
10 GND power_in Ground reference (0 V). Common return for VCC and all logic signals.
11 CLK input Clock input, common to all eight flip-flops. Data on the D inputs is transferred to the corresponding Q outputs on the low-to-high (rising) edge of CLK. Max clock frequency 24 MHz at 4.5 V (74HC).
12 8Q tri_state 3-state noninverting output of flip-flop 8. Drives the stored data when OE is low; Hi-Z when OE is high. ±6 mA drive at VCC = 5 V.
13 7Q tri_state 3-state noninverting output of flip-flop 7. Drives the stored data when OE is low; Hi-Z when OE is high.
14 6Q tri_state 3-state noninverting output of flip-flop 6. Drives the stored data when OE is low; Hi-Z when OE is high.
15 5Q tri_state 3-state noninverting output of flip-flop 5. Drives the stored data when OE is low; Hi-Z when OE is high.
16 4Q tri_state 3-state noninverting output of flip-flop 4. Drives the stored data when OE is low; Hi-Z when OE is high.
17 3Q tri_state 3-state noninverting output of flip-flop 3. Drives the stored data when OE is low; Hi-Z when OE is high.
18 2Q tri_state 3-state noninverting output of flip-flop 2. Drives the stored data when OE is low; Hi-Z when OE is high.
19 1Q tri_state 3-state noninverting output of flip-flop 1. Drives the stored data when OE is low; Hi-Z when OE is high.
20 VCC power_in Positive supply, 2 V to 6 V (typ 5 V). ICC ≤ 80 µA max (74HC) with all inputs at VCC or GND. Decouple with a 100 nF ceramic close to the pin.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-20-208mil
Category Logic
Pins 20

Ordering variants

Same part, different packaging or reel option.

  • SN74HC574NSR
  • SN74HC574NSRDBR
  • SN74HC574NSRDBRE4
  • SN74HC574NSRDBRG4
  • SN74HC574NSRDW
  • SN74HC574NSRDWG4
  • SN74HC574NSRDWR
  • SN74HC574NSRN
  • SN74HC574NSRNE4
  • SN74HC574NSRPW
  • SN74HC574NSRPWE4
  • SN74HC574NSRPWG4
  • SN74HC574NSRPWR
  • SN74HC574NSRPWRE4
  • SN74HC574NSRPWRG4
  • SN74HC574NSRPWT
  • SN74HC574NSRJ
  • SN74HC574NSRW
  • SN74HC574NSRFK

CAD (KiCad official)

  • Symbol: SN74HC574NSR
  • Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
  • 3D model: SOIC-20-208mil (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Texas Instruments datasheet (23 pp, sha256 43bbc5339b26d0b8, 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