Texas Instruments CD4085BE

Overview

CD4085BE from Texas Instruments is a dual 2-input AND-OR-Invert (AOI) gate CMOS logic IC in a 14-pin PDIP package, operating from –55°C to +125°C, with typical propagation delay of 90 ns at 5 V and supply current of 1 µA at 25°C, used in digital control logic, address decoding, and combinational signal conditioning circuits.

For engineers reviewing the CD4085BE datasheet, CD4085BE pinout, CD4085BE application, or CD4085BE equivalent, this page delivers verified functional identity, validated pin assignments, confirmed electrical specs across temperature, package-specific thermal and soldering data, and real-world substitution guidance for legacy CMOS logic design and obsolescence mitigation.

Technical Context

The CD4085BE implements two independent AOI22 gates-each performing (A·B)+(C·D) then inverting the result-using standard CMOS silicon process with rail-to-rail input voltage range and high noise immunity. It supports direct interface with TTL and other CMOS families via compatible logic thresholds.

Its dual-gate architecture enables compact implementation of sum-of-products logic without external inverters, reducing board space and propagation delay in synchronous control paths. The device exhibits no static power consumption in steady state and maintains stable output drive capability across its full industrial temperature range.

Key Specifications

Pinout & Package

CD4085BE is housed in a 14-lead plastic dual-in-line package (PDIP-N), 7.62 mm lead pitch, 19.15 mm body length, 6.22 mm body width, and 3.3 mm minimum height. Pin 1 is located at the left end of the top row, identified by a notch or beveled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual AOI22 logic applications.

Compared with CD4085BM and MC14085BDR2G, the CD4085BE offers through-hole manufacturability and legacy system compatibility, while the alternatives provide modern SMT integration or second-source availability-selection depends on assembly method, board space, and timing budget rather than functional divergence.

Availability

CD4085BE is available at Aetrix Electronics and suitable for industrial control logic, legacy system address decoding, and power sequencing supervision requiring stable component supply across long-lifecycle programs.

Supply support for CD4085BE 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 technologies, with decades of heritage in CMOS logic innovation and industrial-grade reliability.

The CD4085BE belongs to TI's legacy CD4000B series of buffered CMOS logic devices, designed specifically for high-noise-immunity, wide-voltage-range digital control in harsh environments and long-life equipment.

FAQ

What logic function does the CD4085BE implement?

The CD4085BE implements two independent 2-input AND-OR-Invert (AOI22) gates. Each gate computes the logical expression ¬[(A·B)+(C·D)], delivering inverted sum-of-products output. This structure enables efficient realization of Boolean functions common in address decoding, control state machines, and combinational logic without external inverters - a core capability confirmed in the Harris/TI SCHS060C datasheet for CD4085BE.

Is CD4085BE pin-compatible with other CD4000-series logic ICs in PDIP-14 packages?

CD4085BE shares the standard 14-pin PDIP footprint and pin spacing (7.62 mm) with other CD4000B-series devices, but its pin assignment is unique to the dual AOI22 function. Pins 1–5 and 6–12 are dedicated to two independent AOI gates, while pins 13–14 are NC - unlike CD4011 (NAND) or CD4071 (OR), which assign those positions to active logic inputs/outputs. Therefore, CD4085BE is not functionally or pin-compatible with other CD4000B logic types.

What is the maximum operating temperature range for CD4085BE?

The CD4085BE is rated for continuous operation from –55°C to +125°C, as specified in TI's official packaging addendum and confirmed in the SCHS060C datasheet. This extended temperature range qualifies it for use in automotive under-hood modules, industrial motor drives, and aerospace subsystems where ambient thermal stress exceeds commercial-grade limits - a key differentiator from 0°C to +70°C logic families.

Does CD4085BE require external pull-up or pull-down resistors on unused inputs?

Yes - unused inputs on CD4085BE must be terminated to V_DD or GND to prevent floating nodes, which can cause excessive supply current, oscillation, or ESD susceptibility. The datasheet explicitly states that CMOS inputs exhibit high impedance and undefined logic state when left open; connecting unused A/B/C/D inputs of either gate to a defined rail ensures predictable operation and avoids increased power dissipation in the CD4085BE.

Can CD4085BE directly drive LEDs or relay coils?

No - the CD4085BE is not designed for direct high-current actuation. Its output drive capability is ±4.2 mA at 15 V, sufficient for logic-level fanout but inadequate for driving LEDs (typically 5–20 mA) or relay coils (often 20–100 mA). Using CD4085BE to control such loads requires an external buffer transistor or driver IC; attempting direct drive risks output stage damage and violates absolute maximum ratings in the CD4085BE datasheet.