STMicroelectronics 74ACT174MTR

Overview

74ACT174MTR from STMicroelectronics is a high-speed CMOS hex D-type flip-flop with asynchronous clear, operating at 4.5–5.5 V, delivering 200 MHz typical clock frequency, 6 ns propagation delay (tPLH/tPHL), and ±24 mA symmetrical output drive. It serves as a synchronous edge-triggered storage element in digital control logic, clock domain synchronization, and data latching circuits within industrial PLCs and communication interface modules.

For engineers reviewing the 74ACT174MTR datasheet, 74ACT174MTR pinout, 74ACT174MTR application, or 74ACT174MTR equivalent, key selection criteria include TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), 50 Ω transmission line driving capability, latch-up immunity, ESD tolerance (2 kV), and pin/function compatibility with legacy 74-series logic.

Technical Context

The 74ACT174MTR implements six independent D-type latches triggered on the rising edge of a shared CLOCK signal, with a globally active-low CLEAR that asynchronously resets all Q outputs to logic low regardless of clock or data state. Its C2MOS sub-micron silicon gate process enables fast switching while maintaining low quiescent current (ICC ≤ 4 µA).

All inputs and outputs feature integrated protection diodes for ±20 mA DC diode current handling and 2 kV HBM ESD immunity. The device supports direct interfacing with TTL, NMOS, and CMOS logic families due to VIH/VIL thresholds and symmetrical |IOH| = |IOL| = 24 mA (min) drive strength.

Key Specifications

Pinout & Package

74ACT174MTR is supplied in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed pad not present. This RoHS-compliant surface-mount package supports automated reflow assembly and offers improved thermal performance over SOIC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT174DR and 74VHC174M, the 74ACT174MTR uniquely combines TSSOP density, 200 MHz speed, and 24 mA drive-making it optimal for space-constrained, high-speed digital control where pin compatibility and signal integrity are critical.

Availability

74ACT174MTR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74ACT174MTR 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, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74ACT logic family targets high-speed, low-power TTL-compatible digital interface and control applications-specifically engineered to replace legacy 74LS/74F devices with superior speed, drive, and ESD robustness.

FAQ

Is 74ACT174MTR compatible with 5 V TTL logic inputs and outputs?

Yes. Its VIH (≥2.0 V) and VIL (≤0.8 V) thresholds match standard TTL specifications, and its ±24 mA output drive meets or exceeds TTL sink/source requirements. Outputs swing rail-to-rail (VOL ≤ 0.5 V, VOH ≥ 4.7 V at VCC = 5.5 V), ensuring unambiguous logic level recognition.

What is the minimum pulse width required for the CLEAR input?

The minimum LOW pulse width for reliable asynchronous reset is 4.5 ns over the full temperature range (−55°C to +125°C), as specified in the AC Electrical Characteristics table. Shorter pulses may fail to reset all flip-flops deterministically due to internal propagation delays.

Does 74ACT174MTR require external pull-up or pull-down resistors on unused inputs?

No. All inputs include internal protection circuitry and have defined VIH/VIL thresholds; however, floating inputs are not recommended. Unused D inputs should be tied to VCC or GND to prevent noise-induced switching and excess ICC. CLEAR must be actively driven or pulled HIGH via ≥10 kΩ resistor if not used.

Can 74ACT174MTR operate reliably at −55°C ambient temperature?

Yes. Its specified operating temperature range extends to −55°C, and all AC/DC parameters-including propagation delay (11.5 ns max), output drive (24 mA min), and input thresholds-are guaranteed across this full industrial/military range per the Recommended Operating Conditions table.