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Texas Instruments SN74ALS175D — Logic ICs

SN74ALS175D D-Type Flip-Flop, 50 MHz, 16-SOIC

MPNSN74ALS175D
End of Life

Texas Instruments SN74ALS175D, 74ALS series, D-Type flip-flop, 4-bit, positive edge triggered, master reset, complementary outputs, 50 MHz clock, 4.5V–5.5V supply, 17 ns propagation delay at 5V/50pF, 0°C to 70°C, 16-SOIC.

$1.29Ref. price · indicative, final on quote
Texas Instruments SN74ALS175D datasheet (PDF)
Packaging16-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74ALS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74ALS175D specifications
ParameterValue
TypeD-Type
Series74ALS
Output typeComplementary
Trigger typePositive Edge
MountingSurface Mount
Voltage4.5V ~ 5.5V
Current - quiescent14 mA
Current - output high, low400µA, 8mA
Frequency50 MHz
Operating temperature0°C ~ 70°C (TA)
PackageTube
FunctionMaster Reset
Case16-SOIC (0.154\", 3.90mm Width)
Number of elements1
Number of bits per element4
Max propagation delay @ v, max CL17ns @ 5V, 50pF

Product details

The Texas Instruments SN74ALS175D is a single-element, 4-bit D-type flip-flop from the 74ALS family, featuring positive-edge triggering, complementary outputs, and a master-reset function. It clocks at 50 MHz and delivers a propagation delay of 17 ns at 5 V with a 50 pF load, making it a solid choice for register, latch, and buffer applications in 5 V logic systems.

50 MHz clock and 17 ns delay — timing budget reality

The 50 MHz clock and 17 ns propagation delay at 5 V, 50 pF define the timing envelope. The 400 µA output high and 8 mA output low drive are typical for ALS logic.

For a 5 V logic part that has been in production for decades, this is a stable, low-risk line item — no PCN surprises expected in the near term.

The 16-SOIC package has a 3.90 mm body width and 0.154" pitch. The part ships in Tube.

Frequently asked questions

Is SN74ALS175D a direct replacement for 74LS175?

The SN74ALS175D is a higher-speed, lower-power alternative to the 74LS175. The ALS version clocks at 50 MHz versus 40 MHz for the 74LS175, and its propagation delay is 17 ns versus 25 ns at 5 V. Both are positive-edge triggered D-types with master reset and complementary outputs in a 16-pin SOIC footprint. Pin compatibility is the same, so it drops in as a functional upgrade — just verify the supply current (14 mA quiescent for ALS vs 18 mA for LS) and output drive (8 mA low for both) against your load.

What is the difference between SN74ALS175D and SN74HC175?

The SN74HC175 is a CMOS high-speed version with a wider supply range (2 V to 6 V) and lower quiescent current, while the SN74ALS175D is bipolar ALS logic limited to 4.5 V to 5.5 V. The ALS part offers higher output drive (8 mA low) compared to HC's typical 4 mA at 5 V, and its 50 MHz clock is faster than HC's typical 30–40 MHz. The trade-off is power: the ALS draws 14 mA quiescent versus microamps for HC. Choose ALS for legacy 5 V TTL-compatible buses; choose HC for low-power or mixed-voltage designs.

Is SN74ALS175D RoHS compliant and lead-free?

Yes, the SN74ALS175D is ROHS3 compliant, meaning it meets the latest RoHS directive with no exempted substances. The part is lead-free and suitable for lead-free soldering processes.