SN74LS175 Quad D Flip-Flop (DIP-16)

is a quadruple D-type flip-flop IC from Texas Instruments, implemented in TTL (LS) logic. It contains four independent positive-edge-triggered flip-flops with individual data (D) inputs and a shared buffered clock. Each flip-flop has a direct clear input (asynchronous reset) and complementary (double-rail) outputs (Q and Q̅). Data present at a D input (meeting setup time) is transferred to the Q output on the rising edge of the clock; when the clock is low or high, the D input is ignored. These monolithic devices use bipolar transistors on a single silicon die and are fully TTL-compatible.

The SN74LS175 is used in digital logic and control circuits that require multi-bit state storage or synchronization. Common examples include buffer/storage registers, parallel-to-serial shift registers, and pattern generators. It often appears in legacy microprocessor designs, instrumentation, and TTL-based control systems as a 4-bit latch or counter element. Its asynchronous clear inputs make it suitable for timing and sequencing circuits where quick reset of stored bits is needed.

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EstiSource simplifies finding and sourcing components like the SN74LS175 by aggregating distributor inventory, pricing, and lifecycle data. We automatically scan authorized distributors and trusted brokers worldwide to show real-time availability and multi-quantity pricing (as exemplified above) in one view. Our platform flags lifecycle alerts (active, LTB, obsolete) and suggests compatible substitutes if needed. EstiSource also validates supplier legitimacy to reduce counterfeit risk. In practice, EstiSource accelerates your procurement process by providing accurate quotes, lead-time estimates, and expert guidance — reducing procurement effort and risk, and accelerating your time to market.

Why Choose EstiSource for Sourcing SN74LS175

EstiSource is focused on electronic component procurement for engineering teams. We combine detailed technical data with market intelligence and multi-supplier visibility. Design and sourcing engineers benefit from our up-to-date datasheets, RoHS/REACH information, and cross-referenced part histories alongside real-time supply-chain insights. Our clients receive transparent pricing benchmarks and proactive alerts (e.g. when a part like the LS175 nears obsolescence) so they can make informed decisions early. Choosing EstiSource means faster turnarounds on RFQs, vetted source lists for hard-to-find parts, and dedicated support. Our goal is to ensure your designs meet schedule and cost targets while minimizing supply-chain risk.

1. Material Composition

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2. Manufacturing Process

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3. Challenges and Limitations

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4. Cost Estimation & Sourcing Challenges

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5. Properties and Characteristics

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6. Frequently Asked Questions

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Q1: What is SN74LS175 and how many flip-flops does it contain?

SN74LS175 is a Texas Instruments TTL logic IC containing four D-type edge-triggered flip-flops. Each flip-flop has its own data input and both Q and Q̅ outputs, plus shared clock and clear lines.

Q2: What are its operating voltage and maximum clock speed?

It operates at +5 V (standard TTL levels). The maximum clock frequency is around 35–40 MHz (corresponding to propagation delays on the order of 10–50 ns).

Q3: Does SN74LS175 have an asynchronous clear and complementary outputs?

Yes. Each flip-flop includes an active-low direct clear input that asynchronously resets the outputs. When clear is asserted, Q goes low immediately. Each flip-flop also provides both Q and Q̅ outputs, allowing both logic polarities to be available.

Q4: What package options exist and is it still in production?

SN74LS175 is available in a 16-pin PDIP (through-hole) and 16-pin SOIC (surface-mount). The SOIC version (SN74LS175D) is now obsolete, whereas the PDIP (SN74LS175N) remains active. However, TI’s own stock is out-of-production, so procurement relies on distributor inventories or remaining production stock.

Q5: What is the typical cost and where can I buy it?

In small quantities, expect roughly \$0.80–\$1.00 per unit; bulk pricing (1000+ pcs) can go below \$0.50. It is sold by major distributors (e.g. Mouser, Newark) while stock lasts. Specialty suppliers like Rochester Electronics also stock it. Due to its limited availability, design teams often compare costs across suppliers and may consider pin-compatible alternatives (such as the CMOS 74HC175) for future designs.