STMicroelectronics M74HC86TTR

Overview

M74HC86TTR from STMicroelectronics is a high-speed CMOS quad 2-input XOR gate in TSSOP-14 package, delivering symmetrical propagation delays (tPLH ≅ tPHL), 12 ns typical propagation delay at 6 V, 4 mA output drive, and operation across 2–6 V supply. It serves as a logic-level combinatorial building block in digital interface synchronization, parity generation, and signal inversion circuits within industrial control and embedded timing systems.

For engineers reviewing the M74HC86TTR datasheet, M74HC86TTR pinout, M74HC86TTR application, or M74HC86TTR equivalent, key selection criteria include its guaranteed 4 mA output sink/source capability at 4.5 V, ±1 µA max quiescent ICC at 25°C, 28% VCC noise immunity margin, and full pin/function compatibility with legacy 74-series XOR gates-critical for drop-in upgrades and mixed-logic-system integration.

Technical Context

The M74HC86TTR implements four independent 2-input exclusive-OR logic functions using silicon gate C2MOS technology, with input/output buffers enabling stable switching and high noise immunity. Each gate features symmetrical output impedance (|IOH| = IOL ≥ 4 mA) and balanced propagation delays (tPLH ≅ tPHL), ensuring minimal duty-cycle distortion in clocked or data-path applications.

It operates over an extended temperature range (−55°C to +125°C) and wide supply voltage (2 V to 6 V), supporting mixed-voltage system interfacing. Input protection circuits guard against ESD and transient overvoltage, while DC input leakage remains ≤ ±1 µA at 6 V, enabling low-power standby integrity in battery-backed or energy-sensitive designs.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.9 × 6.4 mm body, 0.65 mm pitch, 14-pin surface-mount, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC86DR and 74LVC86PW, the M74HC86TTR uniquely balances wide voltage operation (2–6 V), extended temperature support (−55°C to +125°C), and compact TSSOP packaging-making it optimal for ruggedized embedded systems where interoperability, reliability, and board area are jointly constrained.

Availability

M74HC86TTR is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and medical diagnostic equipment requiring stable component supply across long production lifecycles.

Supply support for M74HC86TTR 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, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The M74HC86 belongs to ST's high-speed CMOS logic family, engineered for pin- and function-compatible replacement of legacy 74-series devices while delivering lower power, higher noise immunity, and extended temperature resilience.

FAQ

Is M74HC86TTR compatible with 5 V TTL inputs?

Yes. With VIH(min) = 3.15 V and VIL(max) = 1.35 V at VCC = 4.5 V, the M74HC86TTR reliably interfaces with standard 5 V TTL outputs. Its input thresholds exceed TTL's 2.0 V VIH and 0.8 V VIL, ensuring noise-margin-safe recognition without level-shifting circuitry.

What is the maximum recommended load capacitance for stable 12 ns propagation delay?

The AC specifications are characterized at CL = 50 pF. Exceeding this (e.g., >75 pF) increases tPLH/tPHL by ~5–8 ns per additional 25 pF due to RC delay. For guaranteed 12 ns performance, keep total node capacitance-including trace, probe, and downstream input-≤50 pF.

Does M74HC86TTR require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs must be tied to VCC or GND-floating inputs cause increased ICC and potential oscillation. The device lacks internal pull-ups/pull-downs; external termination is mandatory for unused pins to ensure defined logic states and prevent shoot-through current.

Can M74HC86TTR operate at 2.0 V with full 4 mA output drive?

No. At VCC = 2.0 V, IOL/IOH is specified only at ±20 µA (not 4 mA). The 4 mA drive rating applies at VCC ≥ 4.5 V. At 2 V, output voltage swing drops to VOH(min) = 1.9 V and VOL(max) = 0.1 V, limiting fanout to high-impedance CMOS loads only.