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SN74AHC74QDRQ1

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Texas Instruments Flip Flops, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74AHC74QDRQ1

Texas Instruments · Flip Flops · SOIC-14

SN74AHC74QDRQ1 from Texas Instruments, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1CLR input Active-low asynchronous clear for flip-flop 1; a low level resets 1Q low regardless of the other inputs.
2 1D input Data input for flip-flop 1; data meeting the setup and hold time requirements is transferred to 1Q on the positive-going edge of 1CLK when PRE and CLR are inactive (high).
3 1CLK input Clock input for flip-flop 1; triggering occurs on the positive-going edge at a voltage level, not directly tied to the clock rise time.
4 1PRE input Active-low asynchronous preset for flip-flop 1; a low level sets 1Q high regardless of the other inputs.
5 1Q output True output of flip-flop 1.
6 ~{1Q} output Complementary output of flip-flop 1.
7 GND power_in Ground reference pin for the device.
8 ~{2Q} output Complementary output of flip-flop 2.
9 2Q output True output of flip-flop 2.
10 2PRE input Active-low asynchronous preset for flip-flop 2; a low level sets 2Q high regardless of the other inputs.
11 2CLK input Clock input for flip-flop 2; triggering occurs on the positive-going edge at a voltage level, not directly tied to the clock rise time.
12 2D input Data input for flip-flop 2; data meeting the setup and hold time requirements is transferred to 2Q on the positive-going edge of 2CLK when PRE and CLR are inactive (high).
13 2CLR input Active-low asynchronous clear for flip-flop 2; a low level resets 2Q low regardless of the other inputs.
14 VCC power_in Supply voltage; the recommended operating range is 2 V to 5.5 V.

Key specifications

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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage VCC 2 5.5 V 3
High-level input voltage VIH 1.5 V VCC = 2 V 3
High-level input voltage VIH 2.1 V VCC = 3 V 3
High-level input voltage VIH 3.85 V VCC = 5.5 V 3
Low-level input voltage VIL 0.5 V VCC = 2 V 3
Low-level input voltage VIL 0.9 V VCC = 3 V 3
Low-level input voltage VIL 1.65 V VCC = 5.5 V 3
Input voltage VI 0 5.5 V 3
Output voltage VO 0 V upper limit printed as VCC 3
High-level output current IOH -50 µA VCC = 2 V 3
High-level output current IOH -4 mA VCC = 3.3 V ± 0.3 V 3
High-level output current IOH -8 mA VCC = 5 V ± 0.5 V 3
Low-level output current IOL 50 µA VCC = 2 V 3
Low-level output current IOL 4 mA VCC = 3.3 V ± 0.3 V 3
Low-level output current IOL 8 mA VCC = 5 V ± 0.5 V 3
Input transition rise or fall rate Δt/Δv 100 ns/V VCC = 3.3 V ± 0.3 V 3
Input transition rise or fall rate Δt/Δv 20 ns/V VCC = 5 V ± 0.5 V 3
Operating free-air temperature TA -40 125 °C 3
Supply voltage range VCC -0.5 7 V 3
Input voltage range VI -0.5 7 V see Note 1 3
Output voltage range VO -0.5 V see Note 1; upper limit printed as VCC + 0.5 V 3
Input clamp current IIK -20 mA VI < 0 3
Output clamp current IOK -20 20 mA VO < 0 or VO > VCC 3
Continuous output current IO -25 25 mA VO = 0 to VCC 3
Continuous current through VCC or GND -50 50 mA 3
Storage temperature range Tstg -65 150 °C 3
High-level output voltage VOH 1.9 2 V IOH = −50 µA, VCC = 2 V, TA = 25°C 4
High-level output voltage VOH 1.9 V IOH = −50 µA, VCC = 2 V, over recommended operating free-air temperature range 4
High-level output voltage VOH 2.9 3 V IOH = −50 µA, VCC = 3 V, TA = 25°C 4
High-level output voltage VOH 2.9 V IOH = −50 µA, VCC = 3 V, over recommended operating free-air temperature range 4
High-level output voltage VOH 4.4 4.5 V IOH = −50 µA, VCC = 4.5 V, TA = 25°C 4
High-level output voltage VOH 4.4 V IOH = −50 µA, VCC = 4.5 V, over recommended operating free-air temperature range 4
High-level output voltage VOH 2.58 V IOH = −4 mA, VCC = 3 V, TA = 25°C 4
High-level output voltage VOH 2.48 V IOH = −4 mA, VCC = 3 V, over recommended operating free-air temperature range 4
High-level output voltage VOH 3.94 V IOH = −8 mA, VCC = 4.5 V, TA = 25°C 4
High-level output voltage VOH 3.8 V IOH = −8 mA, VCC = 4.5 V, over recommended operating free-air temperature range 4
Low-level output voltage VOL 0.1 V IOL = 50 µA, VCC = 2 V, TA = 25°C 4
Low-level output voltage VOL 0.36 V IOL = 4 mA, VCC = 3 V, TA = 25°C 4
Low-level output voltage VOL 0.5 V IOL = 4 mA, VCC = 3 V, over recommended operating free-air temperature range 4
Input leakage current II -0.1 0.1 µA VI = 5.5 V or GND, VCC = 0 V to 5.5 V, TA = 25°C 4
Input leakage current II -1 1 µA VI = 5.5 V or GND, VCC = 0 V to 5.5 V, over recommended operating free-air temperature range 4
Supply current ICC 2 µA VI = VCC or GND, IO = 0, VCC = 5.5 V, TA = 25°C 4
Supply current ICC 20 µA VI = VCC or GND, IO = 0, VCC = 5.5 V, over recommended operating free-air temperature range 4
Input capacitance Ci 2 10 pF VI = VCC or GND, VCC = 5 V, TA = 25°C 4
Package thermal impedance θJA 86 °C/W D package, see Note 2 3

CAD (KiCad official)

  • Symbol: SN74AHC74QDRQ1
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)
  • 3D model files: sn74ahc74qdrq1-etched.step / sn74ahc74qdrq1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ahc74qdrq1.step / sn74ahc74qdrq1.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (14 pp, sha256 3d0eb1da711facb8, retrieved 2026-10-17, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF