STMicroelectronics 74ACT08MTR

Overview

74ACT08MTR from STMicroelectronics is a quad 2-input AND gate in high-speed CMOS technology, designed for TTL-compatible logic interfacing in digital control and signal routing applications. It delivers 4.5 ns typical propagation delay at 5 V, supports 4.5–5.5 V operation, drives 50 Ω transmission lines, and provides ±24 mA symmetrical output current with 2 kV ESD protection.

For engineers reviewing the 74ACT08MTR datasheet, 74ACT08MTR pinout, 74ACT08MTR application, or 74ACT08MTR equivalent, this device is selected for high-noise-immunity combinational logic in industrial controllers, bus interface circuits, and legacy TTL-to-CMOS translation where timing precision and drive strength are critical.

Technical Context

The 74ACT08MTR implements four independent AND gates using sub-micron C2MOS process with buffered outputs, enabling stable switching and high noise immunity. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V) ensure reliable recognition of TTL-level signals.

Propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = IOL ≥ 24 mA), supporting clean edge integrity on controlled-impedance PCB traces. The device operates across –55°C to +125°C with quiescent ICC ≤ 2 µA at 25°C.

Key Specifications

Pinout & Package

74ACT08MTR is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012, with body width 3.9 mm and lead pitch 1.27 mm. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input AND gate applications.

Compared with SN74ACT08DR and 74VHC08M, the 74ACT08MTR uniquely combines 125°C operation, 24 mA drive, and 4.5 ns speed-making it the only option for high-reliability, high-speed 5 V logic in harsh environments.

Availability

74ACT08MTR is available at Aetrix Electronics and suitable for industrial PLC logic modules, legacy system bus interfaces, and digital power sequencing control requiring stable component supply and long-term manufacturability.

Supply support for 74ACT08MTR 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, specializing in automotive, industrial, and power discrete solutions with strong analog and digital portfolio depth.

The 74ACT series targets high-speed, TTL-compatible logic interfacing in industrial and telecom infrastructure, emphasizing robustness, timing precision, and mixed-technology interoperability.

FAQ

Is 74ACT08MTR pin-compatible with standard 74LS08?

Yes - it uses identical pinout and logic function per gate. However, 74ACT08MTR draws significantly less quiescent current (≤2 µA vs. ~15 mA), has faster propagation (4.5 ns vs. ~15 ns), and offers higher output drive (24 mA vs. 8 mA), making it a functional upgrade without board redesign.

Can 74ACT08MTR operate reliably at 3.3 V?

No - its specified operating range is strictly 4.5 V to 5.5 V. At 3.3 V, VIH/VIL thresholds become non-compliant, propagation delay increases unpredictably, and output drive falls below specification. Use 74LVC08 or 74AUP08 for 3.3 V applications.

What is the maximum capacitive load this device can drive while maintaining 4.5 ns tPD?

The 4.5 ns typical tPD is specified at CL = 50 pF. Driving >50 pF increases delay nonlinearly; for loads up to 100 pF, tPD rises to ~6.5 ns. For heavier loads, add series termination or consider buffer stages to preserve timing margins.

Does 74ACT08MTR require external pull-up or pull-down resistors on unused inputs?

Yes - unused inputs must be tied to VCC or GND. Floating CMOS inputs cause increased ICC, potential oscillation, and susceptibility to noise. A 10 kΩ pull-up to VCC is recommended for unused inputs to maintain defined logic state and minimize power consumption.