onsemi SN74LS86M

Overview

SN74LS86M from ON Semiconductor is a quad 2-input exclusive-OR (XOR) gate in SOEIAJ-14 package, operating at 4.75–5.25 V supply with propagation delays of 12–30 ns, output drive capability of −0.4 mA (high) and 8.0 mA (low), used in digital logic comparators, parity generators, and arithmetic circuits.

For engineers reviewing the SN74LS86M datasheet, pinout, applications, or equivalent options, key selection factors include guaranteed TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), low-power Schottky architecture, SOEIAJ-14 mechanical dimensions per Case 965, and AC performance validated at CL = 15 pF and TA = 25°C.

Technical Context

The SN74LS86M implements four independent XOR logic functions using low-power Schottky bipolar technology, ensuring compatibility with standard TTL voltage levels and noise margins. Each gate features symmetric input structure and rail-to-rail output swing under specified load conditions.

It operates across 0°C to 70°C ambient temperature with guaranteed DC parameters including VIH ≥ 2.0 V, VIL ≤ 0.8 V, VOL ≤ 0.4 V at IOL = 4.0 mA, and ICC ≤ 10 mA at VCC = 5.25 V - all verified over full industrial temperature range.

Key Specifications

Pinout & Package

SN74LS86M uses the SOEIAJ-14 surface-mount package (Case 965), with 14 leads, gull-wing lead form, and body dimensions of 8.55–8.75 mm × 3.80–4.00 mm × 1.35–1.75 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS86N and SN74LS86D, the SN74LS86M offers SOEIAJ-14 packaging optimized for high-density surface-mount layouts with tighter width tolerance (3.80–4.00 mm), making it preferable for space-constrained industrial controllers where board area is critical and DIP or standard SOIC footprints are unavailable.

Availability

SN74LS86M is available at Aetrix Electronics and suitable for industrial control panels, legacy system repairs, and educational electronics kits requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74LS86M 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

ON Semiconductor (formerly part of Motorola) is a global supplier of energy-efficient semiconductor solutions, specializing in analog, logic, discrete, and power management devices.

The SN74LS86M belongs to the 74LS logic family designed for TTL-compatible digital systems requiring predictable timing, robust noise immunity, and drop-in replacement capability in commercial-temperature applications.

FAQ

What logic family does the SN74LS86M belong to, and how does it differ from CMOS variants?

The SN74LS86M belongs to the 74LS (Low-Power Schottky) TTL logic family. Unlike CMOS variants such as CD4070, it uses bipolar transistors with Schottky clamping to achieve faster switching than standard TTL while consuming less power. The SN74LS86M operates strictly at 5 V, has asymmetric input thresholds (VIH = 2.0 V, VIL = 0.8 V), and cannot tolerate input voltages beyond VCC or below GND - unlike CMOS, which allows rail-to-rail input swings. Its output drive strength (8 mA sink) also differs significantly from typical CMOS output capabilities.

Is the SN74LS86M pin-compatible with other 74LS86 variants like SN74LS86N or SN74LS86D?

Yes, the SN74LS86M is functionally and electrically identical to SN74LS86N and SN74LS86D, with identical pin assignments across all three packages. However, physical compatibility depends on footprint: SN74LS86M uses SOEIAJ-14 (Case 965), SN74LS86N uses DIP-14 (Case 646), and SN74LS86D uses SOIC-14 (Case 751A). While pin numbering matches, land patterns differ - especially between SOEIAJ and SOIC - so PCB layout must match the specific package variant selected.

What is the maximum capacitive load the SN74LS86M can drive while maintaining guaranteed propagation delay?

The SN74LS86M's AC characteristics specify propagation delay limits (tPLH/tPHL) under test conditions of CL = 15 pF and TA = 25°C. While not explicitly rated for higher capacitance, empirical use shows stable operation up to ~30 pF with increased delay (≈ +15 ns per additional 10 pF). For designs exceeding 15 pF, the SN74LS86M should be buffered or replaced with a higher-drive device; always verify timing margins in final layout using actual net capacitance measurements.

Does the SN74LS86M support mixed-voltage interfacing, such as connecting to 3.3 V logic systems?

No, the SN74LS86M is not designed for direct interfacing with 3.3 V logic. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output voltage levels (VOH ≈ 2.7–3.5 V, VOL ≈ 0.25–0.5 V) fall outside safe 3.3 V CMOS or LVTTL ranges. Driving SN74LS86M inputs from 3.3 V sources risks marginal HIGH recognition; driving 3.3 V inputs from SN74LS86M outputs may violate absolute maximum ratings. Level translation circuitry is required for reliable interoperation.

Can the SN74LS86M be used in place of a 74HC86 in an existing design?

Substituting SN74LS86M for 74HC86 is not recommended without redesign. Although both are quad 2-input XOR gates, they differ fundamentally: 74HC86 is CMOS, operates from 2–6 V, draws µA-level quiescent current, and has rail-to-rail I/O. SN74LS86M is TTL, requires 5 V ±5%, draws mA-level ICC, and has asymmetric voltage thresholds. Swapping them risks timing violations, excessive power draw, or input damage if VCC or signal levels mismatch. Always validate logic levels, timing, and loading before substitution.