STMicroelectronics 74ACT04TTR

Overview

74ACT04TTR from STMicroelectronics is a high-speed CMOS hex inverter with 6 independent inverting buffers, designed for TTL/CMOS/NMOS logic interfacing in digital signal conditioning and bus driving applications. It delivers tPD = 5.0 ns (typ.), symmetrical IOH/IOL ≥ 24 mA, VCC = 4.5–5.5 V operation, and 2 kV ESD immunity.

For engineers reviewing the 74ACT04TTR datasheet, 74ACT04TTR pinout, 74ACT04TTR application, or 74ACT04TTR equivalent, key selection criteria include transmission-line drive capability (50 Ω), balanced propagation delays (tPLH ≅ tPHL), input voltage compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and low quiescent ICC ≤ 2 µA at 25°C.

Technical Context

The device implements three-stage buffered output architecture using sub-micron C2MOS technology, enabling high noise immunity and stable switching across temperature ranges from –55°C to +125°C. Its symmetrical output impedance and matched tPLH/tPHL ensure minimal duty-cycle distortion in clock distribution and data inversion paths.

Designed for direct interface between high-speed CMOS and legacy TTL/NMOS systems, it supports incident-wave switching on 50 Ω transmission lines and meets stringent VIH/VIL thresholds (2.0 V min / 0.8 V max) across full VCC (4.5–5.5 V) and temperature range.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9–5.1 mm width, 6.2–6.6 mm length, 0.65 mm pitch, 0.45–0.75 mm lead length, gull-wing leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter applications.

Compared with SN74ACT04DR and MC74ACT04DT, the 74ACT04TTR offers the smallest footprint (TSSOP-14), optimal for space-constrained industrial control modules, while retaining identical electrical performance and thermal derating behavior across –55°C to +125°C.

Availability

74ACT04TTR is available at Aetrix Electronics and suitable for industrial PLC I/O conditioning, legacy bus level translation, and digital audio clock inversion requiring stable component supply and long-term lifecycle support.

Supply support for 74ACT04TTR 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, specializing in automotive, industrial, and power management ICs.

The 74ACT series targets high-speed, low-power logic interfacing in mixed-voltage systems, with emphasis on robustness, ESD resilience, and compatibility across TTL, CMOS, and NMOS families.

FAQ

What is the maximum operating frequency supported by the 74ACT04TTR?

The 74ACT04TTR does not specify a maximum clock frequency in its datasheet, as it is a combinational logic device. However, with typical propagation delay tPD = 5.0 ns and matched tPLH/tPHL, it reliably supports signal toggling up to approximately 100–120 MHz in well-terminated 50 Ω environments, assuming clean edge rates and minimal interconnect loading.

Can the 74ACT04TTR drive unterminated 50 Ω transmission lines?

Yes - the device guarantees incident-wave switching into 50 Ω loads per AC specifications. With IOH/IOL ≥ 24 mA and symmetrical output impedance, it delivers full logic swing on unterminated lines up to ~10 cm trace length before reflections dominate, eliminating need for external series termination resistors in short-run applications.

Is the 74ACT04TTR pin-compatible with standard 74LS04 devices?

Yes - it is functionally and pin-compatible with 74LS04 and other 74-series hex inverters in 14-pin packages. Input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) match TTL requirements, and output drive strength exceeds LS logic, allowing direct drop-in replacement with improved speed and noise margin.

Does the 74ACT04TTR require external decoupling capacitors?

Yes - STMicroelectronics recommends 100 nF ceramic decoupling capacitor placed as close as possible to the VCC (pin 14) and GND (pin 7) pins. This suppresses high-frequency supply transients induced by simultaneous switching of multiple gates, preventing output instability or false triggering in noise-sensitive systems.