Texas Instruments CD4086BEE4

Overview

CD4086BEE4 from Texas Instruments is a quad 2-input exclusive-NOR (XNOR) gate CMOS logic IC in a 14-lead PDIP package, operating from -55°C to +125°C with supply voltage range 3 V to 18 V, propagation delay 90 ns at 5 V, and static current ≤1 µA. It serves as a level-sensitive combinational logic element in digital control and interface circuits.

For engineers reviewing the CD4086BEE4 datasheet, CD4086BEE4 pinout, CD4086BEE4 application, or CD4086BEE4 equivalent, key selection criteria include its dual-rail CMOS compatibility, wide temperature range, low quiescent power, and direct replacement capability within the CD4000B family for XNOR-based logic synthesis.

Technical Context

The CD4086BEE4 implements four independent 2-input XNOR gates using standard CMOS silicon-gate technology, supporting rail-to-rail input and output swing. Its logic function outputs HIGH when both inputs match (0–0 or 1–1), enabling parity checking, equality comparison, and phase alignment detection.

It features symmetrical input thresholds (~50% V_DD), high noise immunity (>45% V_DD), and inherent latch-up immunity per MIL-STD-883. No external biasing or pull-ups are required, and it interfaces directly with TTL, NMOS, and other CMOS families across its full supply range.

Key Specifications

Pinout & Package

CD4086BEE4 is housed in a 14-lead plastic dual-in-line package (PDIP-N), 0.300-inch width, with 0.100-inch lead pitch and JEDEC MS-001 compliant outline. Pin 1 is marked by a notch or beveled corner on the package top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4077BE and 74HC09, CD4086BEE4 delivers full temperature-range reliability and true single-package XNOR functionality - critical for safety-critical or field-deployed systems where thermal robustness and design simplicity are non-negotiable.

Availability

CD4086BEE4 is available at Aetrix Electronics and suitable for industrial control logic, automotive body electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4086BEE4 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in high-reliability electronic components.

The CD4000B series was designed for robust, low-power, wide-supply-voltage digital logic in harsh environments - targeting aerospace, defense, industrial automation, and medical systems where longevity and stability are essential.

FAQ

What logic function does the CD4086BEE4 implement?

The CD4086BEE4 implements four independent 2-input exclusive-NOR (XNOR) gates. Each gate outputs a HIGH signal only when both inputs are identical (either both LOW or both HIGH). This function is used for equality detection, parity generation, and phase coincidence sensing in digital systems. The CD4086BEE4 performs this logic without external components or clocking, making it ideal for asynchronous control paths.

Can CD4086BEE4 operate at 3.3 V supply voltage?

Yes, CD4086BEE4 operates reliably at 3.3 V, though its propagation delay increases to approximately 150 ns and output drive strength reduces compared to 5 V or higher. Input thresholds remain centered at ~1.65 V, ensuring clean switching. For 3.3 V-only systems, verify load capacitance and timing margins - the CD4086BEE4 remains fully functional but is not optimized for high-speed 3.3 V operation like newer 74LVC families.

Is CD4086BEE4 pin-compatible with CD4077BE?

Yes, CD4086BEE4 is pin-compatible with CD4077BE - both share identical 14-pin PDIP layout and terminal assignments. However, CD4086BEE4 extends the operating temperature range to -55°C to +125°C, while CD4077BE is rated only from -40°C to +85°C. Electrical parameters such as propagation delay and drive strength are closely matched, enabling direct substitution where extended temperature performance is not required.

Does CD4086BEE4 require external pull-up or pull-down resistors on inputs?

No, CD4086BEE4 does not require external pull-up or pull-down resistors on inputs. Its CMOS inputs have extremely high impedance (>10¹² Ω) and defined switching thresholds, allowing them to be left floating only in non-critical test scenarios. For robust operation, unused inputs should be tied to V_DD or GND - but no resistor is needed due to the absence of leakage-induced drift or undefined states seen in bipolar logic.

What is the maximum capacitive load the CD4086BEE4 can drive reliably?

CD4086BEE4 can drive up to 50 pF of total capacitive load per output while maintaining specified propagation delay and waveform integrity at V_DD = 15 V. At lower supply voltages (e.g., 5 V), the safe load limit decreases to ~20 pF. Exceeding these values increases rise/fall times and may cause logic glitches; for heavier loads, buffer stages or dedicated drivers should be added. Layout parasitics must also be included in total load calculation.