STMicroelectronics 74AC86TTR

Overview

74AC86TTR from STMicroelectronics is a quad 2-input exclusive-OR (XOR) gate in TSSOP-14 package, operating across 2V–6V supply, with 4ns typical propagation delay at 5V, ±24mA symmetrical output drive, and 2µA max quiescent current at 25°C-used in digital logic arbitration, parity generation, and waveform mixing in industrial control interfaces.

For engineers reviewing the 74AC86TTR datasheet, 74AC86TTR pinout, 74AC86TTR application, or 74AC86TTR equivalent, key selection criteria include transmission-line driving capability (50Ω), balanced tPLH/tPHL delays, ESD immunity (2kV), wide VCC range, and compatibility with legacy 74-series logic families.

Technical Context

This device implements four independent CMOS XOR gates using sub-micron C2MOS technology, with input protection diodes and double-layer metal interconnects for latch-up immunity. Each gate exhibits rail-to-rail input voltage tolerance (0 to VCC) and guaranteed switching on 50Ω transmission lines.

It supports operation from –55°C to +125°C with VIH/VIL thresholds defined as 28% of VCC (min), ensuring robust noise margins. Propagation delays remain matched (tPLH ≅ tPHL) across temperature and voltage, critical for synchronous logic timing integrity.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.9mm × 6.4mm body, 0.65mm pitch, 1.1mm height - optimized for high-density PCB layouts with thermal and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad XOR gate applications.

Compared with SN74AC86PW and 74VHC86M, the 74AC86TTR uniquely combines 4ns typical speed, full 2–6V operation, and guaranteed 50Ω line driving-making it optimal for timing-critical, multi-rail industrial interfaces where signal fidelity and supply flexibility are non-negotiable.

Availability

74AC86TTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical diagnostic equipment, and test instrumentation requiring stable component supply across extended temperature ranges.

Supply support for 74AC86TTR 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 74AC logic family targets high-speed, low-power TTL-compatible digital interfacing-designed specifically for noise-immune, wide-VCC operation in harsh-environment embedded systems.

FAQ

Is 74AC86TTR pin-compatible with standard 74LS86?

Yes-74AC86TTR uses identical pinout and logic function as 74LS86, but operates at higher speed (4ns vs ~15ns), wider voltage (2–6V vs 4.75–5.25V), and lower power (2µA vs ~10mA). No redesign needed for drop-in replacement in most 5V systems, though decoupling and layout practices must meet CMOS requirements.

Can 74AC86TTR drive a 50Ω coaxial cable directly?

Yes-the datasheet explicitly guarantees incident-wave switching into 50Ω transmission lines. With ±24mA output drive and matched tPLH/tPHL, it delivers clean edges without external termination resistors when driving short (<30cm), properly impedance-controlled traces or cables.

What is the maximum input rise/fall time supported?

The device specifies dt/dv ≤ 8 ns/V for input transitions at VCC = 3.0V, 4.5V, or 5.5V. At 5V, this implies maximum allowable input edge rate of ~625 V/µs-corresponding to ~8ns minimum rise/fall time-ensuring reliable switching without false triggering.

Does 74AC86TTR require external pull-up or pull-down resistors on unused inputs?

No-unused inputs may be tied directly to VCC or GND. The device has no internal pull resistors, but its high input impedance (<0.1µA leakage) and defined VIH/VIL thresholds ensure stable logic states without external biasing, simplifying PCB design and reducing BOM count.