Texas Instruments CD4086BNSR

Overview

CD4086BNSR from Texas Instruments is a CMOS quad 2-input exclusive-NOR (XNOR) gate IC operating across -55°C to +125°C, with supply voltage range 3 V to 18 V, propagation delay of 90 ns at 5 V, and static current ≤ 1 µA. It performs logic equality comparison in digital control circuits, timing synchronization, and parity generation.

For engineers reviewing the CD4086BNSR datasheet, CD4086BNSR pinout, CD4086BNSR application, or CD4086BNSR equivalent, this device serves as a radiation-tolerant, high-voltage-compatible logic building block for industrial control, aerospace sequencing, and legacy system upgrades requiring wide-temperature operation and low-power static logic.

Technical Context

The CD4086BNSR implements four independent XNOR gates using standard CMOS silicon-gate technology, enabling rail-to-rail input/output swing and noise immunity up to 50% of V_DD. Each gate features symmetrical input thresholds and matched rise/fall times under capacitive loads up to 50 pF.

It belongs to the CD4000B series, sharing electrical compatibility with CD4000-series predecessors while improving propagation delay consistency and reducing quiescent current drift over temperature. No internal pull-ups, latches, or Schmitt-trigger inputs are present - all inputs are standard CMOS.

Key Specifications

Pinout & Package

CD4086BNSR is supplied in a 14-lead small-outline integrated circuit (SOIC) package (package drawing D), 1.75 mm maximum height, with gull-wing leads and RoHS-compliant NiPdAu finish. Moisture sensitivity level is Level-1, unlimited reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4086BNSR, CD4077BM offers identical logic in a lower-cost SOIC package but sacrifices extended temperature capability, while SN74HC266N delivers faster performance at 5 V yet cannot operate above 6 V or below -40°C - making CD4086BNSR uniquely suited for wide-supply, high-reliability embedded control.

Availability

CD4086BNSR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, aerospace sequencing logic, and automotive body control units requiring stable component supply across extended temperature and voltage ranges.

Supply support for CD4086BNSR 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and aerospace markets.

The CD4000B series - including CD4086BNSR - was designed for high-voltage, wide-temperature digital logic applications where reliability, supply flexibility, and legacy compatibility outweigh raw speed requirements.

FAQ

What logic function does the CD4086BNSR implement?

The CD4086BNSR implements four independent 2-input exclusive-NOR (XNOR) gates. Each gate outputs HIGH when both inputs are identical (00 or 11) and LOW when they differ (01 or 10). This function is used for equality detection, parity checking, and phase comparison. The CD4086BNSR maintains this behavior across its full 3 V–18 V supply range and -55°C to +125°C operating temperature.

Is CD4086BNSR pin-compatible with CD4077BM?

Yes, CD4086BNSR and CD4077BM share identical pin assignments and logic functionality. Both are 14-pin SOIC-packaged quad XNOR gates with matching input/output placement. However, CD4086BNSR is rated for -55°C to +125°C and supports up to 18 V, whereas CD4077BM is limited to -40°C to +85°C and 15 V max - making CD4086BNSR the only choice for high-reliability extended-temperature applications.

Can CD4086BNSR operate directly from a 12 V automotive battery supply?

Yes, CD4086BNSR operates reliably across 3 V to 18 V, fully covering the 12 V nominal automotive battery range including cold-crank dips (~6 V) and load-dump transients (up to ~16 V). Its CMOS inputs tolerate the full supply range, and output drive strength remains consistent. No external regulation is needed, simplifying design in automotive body control units where CD4086BNSR validates actuator feedback signals.

What is the maximum capacitive load the CD4086BNSR can drive?

The CD4086BNSR is characterized up to 50 pF load capacitance, with propagation delay specified at that value. It can drive heavier loads (e.g., >100 pF) at reduced speed, but signal integrity degrades beyond 50 pF without buffering. For bus-driving or long-trace applications, pairing CD4086BNSR with a dedicated buffer like CD4050B is recommended. Layout best practices - short traces, ground plane, local decoupling - are essential to maintain timing margins.

Does CD4086BNSR require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs on CD4086BNSR must be terminated to V_DD or GND. Floating CMOS inputs cause increased supply current, unpredictable logic states, and potential device heating due to partial conduction in the input stage. A 10 kΩ–100 kΩ resistor is sufficient. Leaving inputs unconnected violates TI's recommended handling and may compromise reliability in mission-critical applications using CD4086BNSR.