What the SN74ALS175D is and where it fits
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. The part is housed in a 16-SOIC surface-mount package and operates over the commercial temperature range of 0°C to 70°C, suitable for indoor equipment like office peripherals, test gear, and industrial control panels that stay in a conditioned environment.
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.
Active lifecycle and compliance
The SN74ALS175D carries an Active product status, so there is no last-time-buy clock ticking. It is ROHS3 compliant, which covers the EU RoHS directive without exemptions. 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.
Package and footprint notes
The 16-SOIC package has a 3.90 mm body width and 0.154" pitch. The part ships in Tube.