onsemi MC74HC86AFELG

Overview

MC74HC86AFELG from onsemi is a quad 2-input exclusive-OR (XOR) gate in high-performance silicon-gate CMOS technology, operating from 2.0 V to 6.0 V. It delivers 10 LSTTL load drive capability, features low input current (≤1 µA), and supports industrial temperature range (−55 °C to +125 °C). It is used in digital logic systems requiring error detection, parity generation, or arithmetic summing.

For engineers reviewing the MC74HC86AFELG datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage compatibility (2.0–6.0 V), propagation delay (17 ns at 6.0 V), input/output voltage thresholds, TSSOP-14 package constraints, and CMOS/TTL interface capability.

Technical Context

The MC74HC86AFELG implements four independent XOR gates with identical logic function Y = A ⊕ B = AB̅ + A̅B. Each gate exhibits symmetrical propagation delay (t_PLH/t_PHL) and output transition time (t_TLH/t_THL), with guaranteed performance across −55 °C to +125 °C.

Input structure supports standard CMOS logic levels and, with pullup resistors, interfaces directly to LSTTL outputs. Output drive strength is specified for 2.4 mA, 4.0 mA, and 5.2 mA sink/source under defined V_CC conditions, ensuring reliable fanout to downstream CMOS, NMOS, and TTL loads.

Key Specifications

Pinout & Package

TSSOP-14 (Case 948G) surface-mount package with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed pad not present. RoHS-compliant, Pb-free, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC86DR and 74VHC86M, the MC74HC86AFELG offers optimal balance of compact TSSOP-14 packaging, wide 2.0–6.0 V operation, and proven industrial temperature reliability - making it preferred for space-constrained, multi-rail embedded controllers.

Availability

MC74HC86AFELG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MC74HC86AFELG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The MC74HC86AFELG belongs to the 74HC high-speed CMOS logic family, designed for drop-in replacement of legacy TTL logic while delivering lower power, wider voltage range, and enhanced noise immunity in cost-sensitive digital systems.

FAQ

What is the maximum propagation delay of the MC74HC86AFELG at 5.0 V supply?

The MC74HC86AFELG has a maximum propagation delay (t_PLH/t_PHL) of 20 ns at V_CC = 5.0 V and T_A = 125 °C, as specified in the AC Electrical Characteristics table. This value ensures predictable timing in synchronous logic designs and meets setup/hold margin requirements for 25 MHz clock domains. The MC74HC86AFELG maintains consistent delay across all four gates under identical conditions.

Can the MC74HC86AFELG interface directly with 3.3 V microcontroller GPIOs?

Yes, the MC74HC86AFELG supports 3.3 V operation within its 2.0–6.0 V supply range and has VIH(min) = 2.1 V and VIL(max) = 0.9 V at V_CC = 3.3 V - fully compatible with standard 3.3 V CMOS logic levels. Its outputs swing rail-to-rail (VOL ≤ 0.26 V, VOH ≥ 3.04 V at I_OUT = 4.0 mA), ensuring noise-immune interfacing to MCUs such as STM32 or PIC32 without level shifters. The MC74HC86AFELG is widely deployed in such mixed-voltage systems.

Is the MC74HC86AFELG pin-compatible with the LS86 TTL device?

Yes, the MC74HC86AFELG is explicitly designed to be identical in pinout to the 74LS86, as stated in the datasheet. All 14 pins - including inputs A1–B4, outputs Y1–Y4, V_CC, and GND - occupy identical positions in the TSSOP-14 package. This enables direct replacement in existing LS86 layouts with no PCB changes, provided supply voltage and loading conditions are updated to match CMOS requirements. The MC74HC86AFELG retains functional equivalence while improving power efficiency and noise margin.

What is the thermal resistance (θ_JA) of the MC74HC86AFELG in its TSSOP-14 package?

The MC74HC86AFELG in TSSOP-14 (Case 948G) has a junction-to-ambient thermal resistance (θ_JA) of 150 °C/W, measured on a standard FR4 board with 76 mm × 114 mm, 2-ounce copper traces and no airflow (per JESD51-7). This value informs thermal design for continuous operation at elevated ambient temperatures; at 50 mW total dissipation, the junction rise is 7.5 °C above ambient. The MC74HC86AFELG's low ICC (≤40 µA) minimizes self-heating in static applications.

Does the MC74HC86AFELG require external pull-up resistors for TTL input compatibility?

Yes - while the MC74HC86AFELG inputs are inherently compatible with standard CMOS outputs, they require external pull-up resistors (typically 1–10 kΩ to V_CC) to interface reliably with LSTTL outputs, which cannot drive CMOS input thresholds without assistance. This configuration ensures VIH remains ≥1.5 V across temperature and process variation. The MC74HC86AFELG datasheet explicitly states this requirement; omitting pull-ups may cause logic misreads in mixed-technology systems.