STMicroelectronics 74ACT32MTR

Overview

74ACT32MTR from STMicroelectronics is a quad 2-input OR gate in high-speed CMOS technology, operating at 4.5–5.5 V with 4.5 ns typical propagation delay, ±24 mA symmetrical output drive, and TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). It interfaces directly between HCMOS, TTL, and NMOS systems in digital logic control and bus arbitration circuits.

For engineers reviewing the 74ACT32MTR datasheet, 74ACT32MTR pinout, 74ACT32MTR application, or 74ACT32MTR equivalent, key selection criteria include transmission-line driving capability (50 Ω), latch-up immunity, ESD tolerance (2 kV), and guaranteed balanced tPLH/tPHL performance across industrial temperature range (–55°C to +125°C).

Technical Context

The 74ACT32MTR implements four independent OR logic functions using sub-micron C2MOS process with double-layer metal wiring, featuring buffered outputs for enhanced noise immunity and stable switching. Its internal two-stage architecture ensures consistent voltage transfer characteristics and low input leakage (±0.1 µA at VCC = 5.5 V).

Designed for direct interfacing across logic families, it meets TTL voltage thresholds while delivering CMOS-level power efficiency (ICC ≤ 2 µA at TA = 25°C) and robust transient handling via integrated input/output protection diodes rated for ±20 mA DC clamp current.

Key Specifications

Pinout & Package

74ACT32MTR is housed in a 14-lead SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, compliant with JEDEC MS-012 and ECAD footprint standard SO-14. Dimensions: 8.75 × 5.9 mm body, 1.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT32DR and 74VHC32M, the 74ACT32MTR uniquely combines industrial temperature range, 2 kV ESD rating, and guaranteed 50 Ω transmission-line drive-making it the sole option for safety-critical or high-reliability embedded control where signal integrity and environmental robustness are non-negotiable.

Availability

74ACT32MTR is available at Aetrix Electronics and suitable for industrial PLC logic modules, automotive body control units, communications backplane buffers, and test equipment signal generators requiring stable component supply across long production lifecycles.

Supply support for 74ACT32MTR 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 74ACT family targets high-speed, low-power logic interfacing-specifically engineered to bridge legacy TTL systems with modern CMOS architectures while maintaining robustness in harsh electrical environments.

FAQ

Is 74ACT32MTR pin-compatible with standard 74LS32?

Yes, 74ACT32MTR is pin- and function-compatible with 74LS32, sharing identical SO-14 pinout and truth table. However, it operates at higher speed (4.5 ns vs. 15 ns), draws lower quiescent current (2 µA vs. 19 mA), and provides stronger output drive (24 mA vs. 8 mA), making it a direct performance upgrade without layout changes.

Can 74ACT32MTR operate reliably at 4.5 V supply?

Yes, 74ACT32MTR is fully specified down to VCC = 4.5 V across all operating temperatures. At this minimum voltage, VOH remains ≥3.86 V (IOH = –24 mA) and VOL stays ≤0.5 V (IOL = 24 mA), ensuring noise margins exceed 0.7 V for TTL-compatible interfacing.

Does 74ACT32MTR require external pull-up or pull-down resistors on unused inputs?

No-unused inputs may be tied directly to VCC or GND. The device features CMOS input structure with negligible leakage (±0.1 µA), so floating inputs are prohibited due to risk of increased ICC and metastability; hard-wiring ensures predictable logic state and minimal power impact.

What is the maximum recommended capacitive load for 74ACT32MTR outputs?

The AC specifications (tPLH/tPHL, VOH/VOL) are characterized at CL = 50 pF. While the device can drive heavier loads, propagation delay increases linearly with capacitance-e.g., 100 pF adds ~2.5 ns delay. For designs exceeding 50 pF, verify timing margins using the measured tPD vs. CL curve from Figure 5 of the STMicroelectronics datasheet.