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Texas Instruments SN74ALS74ADR — Logic ICs

SN74ALS74ADR Texas Instruments D-Type Flip-Flop, 34 MHz

MPNSN74ALS74ADR
End of Life

Texas Instruments 74ALS series SN74ALS74ADR, D-Type flip-flop, dual 1-bit, positive edge trigger, complementary outputs, set/preset and reset, 34 MHz, 4.5-5.5V, 14-SOIC, 0°C to 70°C.

$0.88Ref. price · indicative, final on quote
Texas Instruments SN74ALS74ADR datasheet (PDF)
Packaging14-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74ALS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74ALS74ADR specifications
ParameterValue
TypeD-Type
Series74ALS
Output typeComplementary
Trigger typePositive Edge
MountingSurface Mount
Supply voltage4.5V ~ 5.5V
Current - quiescent4 mA
Current - output high, low400µA, 8mA
Clock frequency34 MHz
Operating temperature0°C ~ 70°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionSet(Preset) and Reset
Case14-SOIC (0.154\", 3.90mm Width)
Number of elements2
Number of bits per element1
Max propagation delay @ v, max CL18ns @ 5V, 50pF

Product details

Dual D-type flip-flop with set and reset — 34 MHz, 5V only

Each of the two elements stores one bit. It operates from a 4.5 V to 5.5 V supply — strictly a 5 V rail part — and is specified over the commercial temperature range of 0°C to 70°C. Propagation delay is 18 ns typical at 5 V into a 50 pF load, which sets the timing budget for bus-oriented or control-register applications in office equipment, appliances, and indoor PCB designs. The package is a 14-SOIC (3.90 mm width), surface-mount, and the part is ROHS3 compliant.

The 34 MHz clock frequency and 18 ns propagation delay (at 5 V, 50 pF) define the usable speed grade for this flip-flop. Quiescent current is 4 mA, and the output drive is 400 µA source, 8 mA sink.

Frequently asked questions

Can I use SN74ALS74ADR with 3.3V logic?

No, the supply voltage range is 4.5 V to 5.5 V. 3.3 V operation is not supported; level translation is required for mixed-voltage designs.

What is the difference between SN74ALS74ADR and SN74ALS74AN?

The SN74ALS74ADR is the surface-mount 14-SOIC version (Tape & Reel), while the SN74ALS74AN is the through-hole DIP version. Function and electrical specs are identical.

Can I replace SN74ALS74ADR with a 74HC74?

A 74HC74 is a CMOS D-type flip-flop with a wider supply range (2 V to 6 V) and lower power, but its input thresholds and output drive differ from the 74ALS bipolar family. Direct replacement requires checking input logic levels and propagation delay against the design's timing budget.