Texas Instruments CD4086BME4

Overview

CD4086BME4 from Texas Instruments is a quad 2-input exclusive-NOR (XNOR) gate CMOS logic IC in a 14-lead SOIC package, operating across -55°C to +125°C, with typical propagation delay of 90 ns at 5 V and 100 ns at 10 V, used in digital control, level translation, and combinational logic circuits.

For engineers reviewing the CD4086BME4 datasheet, CD4086BME4 pinout, CD4086BME4 application, or CD4086BME4 equivalent, this page delivers verified functional identity, package mapping, real-world timing behavior, supply voltage tolerance, and direct alternative options for industrial and aerospace-grade logic design.

Technical Context

The CD4086BME4 implements four independent XNOR gates using standard CMOS silicon process, with symmetrical input thresholds (~50% V_DD) and rail-to-rail output swing. It supports dual-supply operation from 3 V to 18 V DC and exhibits high noise immunity (typ. 45% V_DD).

Its logic function is defined as Y = A ⊙ B = (A·B) + (Ā·B̄), enabling parity checking, equality comparison, and phase-coincidence detection in synchronous systems without external inversion.

Key Specifications

Pinout & Package

CD4086BME4 is housed in a 14-lead small-outline integrated circuit (SOIC) package (package drawing D, TI suffix M), 3.9 mm wide, 8.65 mm long, 1.75 mm max height, with gull-wing leads and JEDEC MS-012AB compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar XNOR logic applications.

Compared with CD4086BME4, CD4077BM96 offers identical functionality at lower cost but lacks extended temperature support, while 74HC09 requires external circuitry to achieve XNOR behavior and sacrifices deterministic timing and noise margin.

Availability

CD4086BME4 is available at Aetrix Electronics and suitable for industrial PLC I/O conditioning, aerospace avionics signal validation, and automotive body control module designs requiring stable component supply across extended temperature ranges.

Supply support for CD4086BME4 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

Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions with over 90 years of reliability engineering heritage.

The CD4086BME4 belongs to TI's CD4000B-series CMOS logic family, designed for high-noise-immunity, wide-voltage, and extended-temperature applications in mission-critical systems where latch-up resistance and low static power are essential.

FAQ

What logic function does the CD4086BME4 implement?

The CD4086BME4 implements four independent 2-input exclusive-NOR (XNOR) gates. Each gate outputs HIGH when both inputs match (both HIGH or both LOW), and LOW when inputs differ. This function is used for equality detection, parity generation, and phase coincidence monitoring in digital systems. The CD4086BME4 performs this without external components and maintains consistent behavior across its full 3 V–18 V supply range.

Is CD4086BME4 compatible with TTL logic levels?

Yes, CD4086BME4 accepts TTL-compatible input voltages when operated at V_DD ≥ 4.5 V: a TTL HIGH (≥2.4 V) exceeds its input threshold (~0.5 × V_DD), and a TTL LOW (≤0.8 V) remains safely below it. At lower V_DD, interface resistors or level shifters may be needed. The CD4086BME4 itself outputs full CMOS swing, so direct driving of TTL loads requires verifying sink/source current capability at the target V_DD.

What is the maximum operating frequency for CD4086BME4 in a 5-V system?

In a 5-V system, the CD4086BME4 has a typical propagation delay of 90 ns per gate, limiting reliable toggle frequency to approximately 5.5 MHz for a single-stage feedback path. For combinational logic chains, maximum clock rate depends on total path delay; e.g., two cascaded CD4086BME4 gates yield ~180 ns delay, supporting ≤5.5 MHz synchronous operation. The CD4086BME4 is not intended for high-speed clock distribution but excels in control and monitoring logic where deterministic timing matters more than raw speed.

Does CD4086BME4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs on CD4086BME4 must be terminated to either V_DD or GND. Floating CMOS inputs can cause increased supply current, oscillation, or unpredictable output states due to noise coupling. TI recommends connecting unused inputs directly to V_DD or GND using short traces; resistor termination (e.g., 10 kΩ) is acceptable but adds unnecessary node capacitance. This requirement applies uniformly across all CD4086BME4 gates and is critical to ensure stable operation of the entire IC.

How does CD4086BME4 differ from CD4086BE in terms of packaging and thermal performance?

The CD4086BME4 uses a 14-lead SOIC (D) package with 1.75 mm max height and moisture sensitivity level 1 (260°C reflow), while CD4086BE uses a 14-lead PDIP (N) package with 5.08 mm height and no MSL rating. Both share identical electrical specs and -55°C to +125°C operation, but the CD4086BME4 offers superior thermal resistance (θ_JA ≈ 130°C/W vs. ~80°C/W for PDIP) and smaller PCB footprint. The CD4086BME4 is preferred for space-constrained, surface-mount designs requiring automated assembly.