STMicroelectronics 74ACT20MTR

Overview

74ACT20MTR from STMicroelectronics is a dual 4-input NAND gate in advanced high-speed CMOS technology, operating at 4.5–5.5 V with 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 gating applications.

For engineers reviewing the 74ACT20MTR datasheet, 74ACT20MTR pinout, 74ACT20MTR application, or 74ACT20MTR equivalent, key selection considerations 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 device implements two independent 4-input NAND gates using sub-micron silicon gate C2MOS process with three-stage buffered output architecture, enabling high noise immunity and stable switching. Each gate features symmetrical output impedance (|IOH| = IOL ≥ 24 mA) and supports incident-wave switching on 50 Ω transmission lines.

Input protection includes diode clamps for ESD robustness (2 kV HBM), while absolute maximum ratings specify VCC up to +7 V and VI up to VCC + 0.5 V. Operating conditions mandate VCC = 4.5–5.5 V and support full industrial temperature range (–55 °C to +125 °C) with validated AC performance at CL = 50 pF and RL = 500 Ω.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9–5.1 mm width, 6.25–6.5 mm length, 0.65 mm pitch, 0.5–0.7 mm lead length, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-input NAND gate applications.

Compared with SN74ACT20DR and 74VHC20M, the 74ACT20MTR uniquely delivers full industrial temperature range, 50 Ω transmission-line drive, and 2 kV ESD immunity in a single TSSOP-14 package-critical for mission-critical control logic where reliability trumps marginal cost savings.

Availability

74ACT20MTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical diagnostic imaging interface designs requiring stable component supply and long-term lifecycle assurance.

Supply support for 74ACT20MTR 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 for seamless connectivity between TTL, CMOS, and NMOS systems in harsh-environment control applications.

FAQ

Is 74ACT20MTR pin-compatible with standard 74LS20?

Yes-74ACT20MTR is pin- and function-compatible with 74LS20, sharing identical TSSOP-14 pinout and dual 4-input NAND logic. However, it operates at higher speed (5 ns vs. 15 ns), lower ICC (4 µA vs. 19 mA), and supports wider VCC (4.5–5.5 V vs. 4.75–5.25 V), making it a direct upgrade without PCB redesign.

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

The 74ACT20MTR is characterized for CL = 50 pF in AC specs, with guaranteed tPD and waveform integrity. While it can drive heavier loads, exceeding 50 pF increases propagation delay nonlinearly and may cause ringing on unterminated lines; for >50 pF, add series termination or buffer stages per layout simulation.

Does this part support hot-swap or live-insertion?

No-74ACT20MTR lacks hot-swap circuitry such as power-up sequencing control or I²C-style bus hold. Its absolute maximum ratings require VCC to be stable before applying input signals; inserting into a live backplane risks violating VI limits (–0.5 V to VCC + 0.5 V) and triggering latch-up.

Can 74ACT20MTR be used with 3.3 V logic systems?

Not directly-its VCC range is strictly 4.5–5.5 V, and inputs require VIH ≥ 2.0 V (minimum) for recognition. Driving it from 3.3 V logic violates VIH spec; use a level translator like TXB0108 or discrete MOSFET buffer to interface with 3.3 V systems safely.