STMicroelectronics 74ACT04MTR

Overview

74ACT04MTR from STMicroelectronics is a high-speed CMOS hex inverter with 5.0 ns typical propagation delay at 5 V, ±24 mA symmetrical output drive, and 4.5–5.5 V operating range. It features TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), 2 kV ESD protection, and pin/function compatibility with standard 74-series 04 logic. Used in digital signal inversion within industrial control backplanes and legacy bus interface circuits.

For engineers reviewing the 74ACT04MTR datasheet, 74ACT04MTR pinout, 74ACT04MTR application, or 74ACT04MTR equivalent, key selection criteria include propagation delay matching, 50 Ω transmission line driving capability, symmetrical tPLH/tPHL balance, and guaranteed 24 mA sink/source across -55°C to +125°C.

Technical Context

The 74ACT04MTR implements six independent CMOS inverter gates using sub-micron C2MOS technology with three-stage buffered outputs, enabling high noise immunity and stable rail-to-rail switching. Its internal design ensures balanced rise/fall times and matched propagation delays (tPLH ≅ tPHL) under 50 pF load conditions.

It operates strictly within 4.5–5.5 V VCC, supports direct interfacing with TTL, NMOS, and CMOS logic families, and incorporates input/output ESD protection diodes rated for ±20 mA DC current and 2 kV HBM-critical for board-level robustness in noisy industrial environments.

Key Specifications

Pinout & Package

74ACT04MTR is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package per mechanical data PO13G: 8.55–8.75 mm body width, 5.8–6.2 mm body length, 1.27 mm lead pitch, and 0.35–0.46 mm lead thickness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT04DR and MC74ACT04DG, the 74ACT04MTR provides superior extended-temperature operation and higher ESD immunity-making it the preferred choice for mission-critical industrial and automotive applications where reliability under stress is non-negotiable.

Availability

74ACT04MTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy bus interfaces, automotive body control modules, and automated test equipment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 74ACT04MTR 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 microcontrollers, analog ICs, power devices, and discrete components for industrial, automotive, and consumer markets.

The 74ACT04MTR belongs to ST's legacy high-speed CMOS logic family, engineered specifically for drop-in replacement of 74LS and 74F series in noise-sensitive, high-reliability systems requiring TTL compatibility and enhanced robustness.

FAQ

Is 74ACT04MTR pin-compatible with standard 7404 logic devices?

Yes, 74ACT04MTR is fully pin- and function-compatible with industry-standard 74-series hex inverters including 74LS04 and 74F04. All six inverter inputs (pins 1,3,5,9,11,13) and outputs (pins 2,4,6,8,10,12) map identically, with GND on pin 7 and VCC on pin 14. No PCB redesign is needed for migration.

What is the maximum capacitive load this device can drive reliably?

The 74ACT04MTR is characterized for CL = 50 pF with RL = 500 Ω and input rise/fall times of 3 ns. While it can drive heavier loads, sustained operation above 50 pF may increase propagation delay beyond 9.5 ns max and degrade edge fidelity-designers should verify timing margins using the device's 24 mA drive capability and actual trace capacitance.

Does this device require external pull-up or pull-down resistors on unused inputs?

No. All inputs feature internal protection circuitry and defined logic thresholds; however, STMicroelectronics recommends tying unused inputs to VCC or GND to prevent floating nodes that could cause increased ICC or unintended switching. This avoids potential noise coupling and ensures predictable quiescent current (≤2 µA).

Can 74ACT04MTR operate at 3.3 V supply voltage?

No. The 74ACT04MTR is specified only for 4.5–5.5 V operation. At 3.3 V, VIH/VIL thresholds become non-compliant, output drive collapses below specification, and propagation delay increases significantly. For 3.3 V systems, consider ST's 74LVC04 or 74ALVC04 families instead.