STMicroelectronics M74HC86B1R

Overview

M74HC86B1R from STMicroelectronics is a high-speed CMOS quad 2-input XOR gate in 14-pin DIP package, delivering tPD = 12 ns (typ.) at VCC = 6 V, symmetrical IOH/IOL ≥ 4 mA, and operating across 2 V to 6 V supply. It serves as a logic-level combinatorial function block in digital control, parity generation, and waveform modulation circuits.

For engineers reviewing the M74HC86B1R datasheet, M74HC86B1R pinout, M74HC86B1R application, or M74HC86B1R equivalent, this device supports noise-immune TTL/CMOS interfacing, requires no external pull-ups for standard logic levels, and maintains balanced propagation delays (tPLH ≅ tPHL) critical for synchronous signal routing.

Technical Context

The M74HC86B1R implements four independent XOR gates using silicon-gate C2MOS technology, with input/output buffers enabling 28% VCC noise immunity (VNIH/VNIL min). Each gate features diode-protected inputs and rail-to-rail output swing under load.

It operates over -55°C to +125°C, supports input rise/fall times up to 1000 ns at VCC = 2 V, and exhibits matched AC timing-tPLH and tPHL differ by ≤10% across voltage/temperature ranges-ensuring deterministic phase alignment in feedback or clock-xor paths.

Key Specifications

Pinout & Package

Package: Plastic DIP-14 (Dual In-line Package), 0.3" wide body, through-hole mounting, JEDEC MS-001 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC86N and 74VHC86N, the M74HC86B1R offers optimal balance of 6 V tolerance, ultra-low ICC, and proven robustness in extended temperature automotive use-making it preferred for cost-sensitive, thermally demanding control modules.

Availability

M74HC86B1R is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and legacy 5 V embedded instrumentation requiring stable component supply across long product lifecycles.

Supply support for M74HC86B1R 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 M74HC86B1R belongs to the high-speed HC logic family, engineered for drop-in replacement of 74LS devices while delivering CMOS power efficiency and enhanced noise margin in harsh electrical environments.

FAQ

What is the maximum recommended input rise/fall time for reliable operation?

The datasheet specifies maximum input transition times of 1000 ns at VCC = 2 V, 500 ns at 4.5 V, and 400 ns at 6.0 V. Exceeding these may cause increased propagation delay variation or metastability in edge-sensitive applications. For clean switching, keep tr/tf ≤ 100 ns in 5 V systems.

Can M74HC86B1R operate reliably at 2.0 V supply?

Yes-it is fully specified down to 2.0 V, with VIH = 1.5 V (min), VOL ≤ 0.1 V (at 20 µA), and tPD = 140 ns (max) across -55°C to +125°C. This enables use in battery-powered sensors where supply drops below 2.5 V during discharge cycles.

Is there a surface-mount alternative with identical pinout?

The SOP-14 variant M74HC86M1R shares identical logic function, pin numbering, and DC/AC specs. Its SO-14 footprint (PO13G) differs mechanically but maintains 1:1 pin correspondence-allowing direct PCB redesign with reflow-compatible assembly.

Does this device include Schmitt-trigger inputs?

No-M74HC86B1R uses standard CMOS inputs without hysteresis. Input thresholds are fixed at ~30% and ~70% of VCC. For noisy signal conditioning, external RC filtering or a dedicated Schmitt-trigger buffer (e.g., M74HC14) is required before the XOR inputs.