STMicroelectronics M74HC175TTR

Overview

M74HC175TTR from STMicroelectronics is a high-speed CMOS quad D-type flip-flop with asynchronous clear, fabricated in silicon gate C2MOS technology. It features 16 ns typical propagation delay at 6 V, ±4 mA output drive, 2–6 V operating voltage range, and operates across –55°C to +125°C. It is used in synchronous logic control, data latching, and clocked register stages in industrial PLCs and instrumentation.

For engineers reviewing the M74HC175TTR datasheet, M74HC175TTR pinout, M74HC175TTR application, or M74HC175TTR equivalent, key selection criteria include asynchronous reset behavior, symmetrical tPLH/tPHL timing, guaranteed noise immunity (28% VCC), and TSSOP-16 compatibility for high-density PCB layouts.

Technical Context

The M74HC175TTR implements four edge-triggered D-type flip-flops sharing a common clock and active-low asynchronous clear. Each stage transfers D-input data to Q/Q̅ outputs on the positive-going clock edge, with no internal feedback or preset functionality.

Its C2MOS process ensures low static current (4 µA max at 25°C) and high noise immunity (VIH/VIL thresholds defined as 70%/30% of VCC). Propagation delays are balanced (tPLH ≈ tPHL), and input rise/fall time limits are specified per supply voltage (e.g., ≤400 ns at 6 V).

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad D-type flip-flop with clear applications.

Compared with SN74HC175DR and 74LVC175PW, the M74HC175TTR uniquely balances wide-voltage operation (2–6 V), industrial temperature range, and TSSOP-16 compactness - making it the only choice for mixed-voltage, high-reliability embedded control where board area and thermal margin are constrained.

Availability

M74HC175TTR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pump logic, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC175TTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The M74HC175TTR belongs to ST's high-reliability HC logic family, engineered specifically for robust operation in harsh environments - emphasizing noise immunity, wide voltage tolerance, and extended temperature qualification.

FAQ

Is the M74HC175TTR pin-compatible with standard 74LS175?

Yes - it matches the 74LS175 pinout and logic function, but operates with CMOS voltage thresholds and significantly lower power. The CLEAR, CLOCK, D, Q, and Q̅ pins align exactly; however, input voltage levels differ (e.g., VIH = 3.15 V min at 4.5 V VCC), so direct replacement requires verifying signal swing compatibility.

What is the minimum clock pulse width requirement at 5 V?

At VCC = 4.5 V, the minimum clock high and low pulse width is 7 ns (typical) and 19 ns (max) across –40°C to +85°C. This ensures reliable edge detection and avoids metastability; design margins should maintain ≥25 ns for robust operation in noisy systems.

Does the CLEAR input override the clock during power-up sequencing?

Yes - CLEAR is asynchronous and active-low. Holding CLEAR low during VCC ramp-up guarantees all Q outputs remain low until the supply stabilizes and CLEAR is released, preventing undefined output states during boot. No clock edge is required for this reset action.

Can M74HC175TTR drive LED indicators directly?

No - its absolute maximum output current is ±25 mA, but recommended DC drive is ±4 mA (min) for guaranteed VOH/VOL. Direct LED driving risks violating VOL spec under load; use a series resistor ≥1 kΩ with 5 V supply or add a buffer transistor for indicator loads >2 mA.