Texas Instruments CD4085BF

Overview

CD4085BF from Texas Instruments is a dual 2-input AND-OR-Invert (AOI) gate CMOS logic IC in a 14-lead hermetic ceramic dual-in-line package (CDIP), 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 aerospace-level combinational logic design where radiation tolerance and thermal stability are critical.

For engineers reviewing the CD4085BF datasheet, CD4085BF pinout, CD4085BF application, or CD4085BF equivalent, this page delivers verified package mapping, validated AOI logic function, confirmed military-grade temperature range, and direct alternatives for legacy system sustainment and high-reliability digital control design.

Technical Context

The CD4085BF implements two independent 2-input AND-OR-Invert gates - each performing (A·B)+(C·D) then inverting the result - with fully buffered inputs and outputs. It uses standard CMOS silicon-on-sapphire or silicon-gate process technology optimized for low static power consumption (≤0.1 µA at 5 V, 25°C) and high noise immunity (V_NIH/V_NIL ≥ 45% V_DD).

It supports dual-supply operation from 3 V to 18 V DC, exhibits symmetrical output drive capability (±4.2 mA at V_DD = 15 V), and maintains functional integrity under extended temperature cycling and hermetic seal integrity per MIL-STD-1835 GDIP1-T14 mechanical specification.

Key Specifications

Pinout & Package

CD4085BF is housed in a 14-lead hermetic ceramic dual-in-line package (CDIP, J suffix), compliant with MIL-STD-1835 GDIP1-T14, with 0.300-inch body width, 0.100-inch lead pitch, and glass-frit sealed ceramic lid ensuring long-term moisture and gas impermeability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4085BF, CD4085B-MIL adds formal QML-V certification overhead without altering logic behavior or timing, while CD4085BE trades hermetic reliability for lower cost and RoHS compliance - making CD4085BF the optimal choice for legacy aerospace hardware sustainment requiring proven ceramic-package longevity.

Availability

CD4085BF is available at Aetrix Electronics and suitable for avionics fault monitoring, satellite command decoding, and missile guidance interface applications requiring stable component supply across extended product lifecycles.

Supply support for CD4085BF 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The CD4085BF belongs to TI's legacy CD4000B-series CMOS logic family, designed specifically for high-stability, wide-temperature digital control in mission-critical aerospace and defense systems where long-term parametric consistency is mandatory.

FAQ

What logic function does the CD4085BF implement?

The CD4085BF implements two independent 2-input AND-OR-Invert (AOI) gates, each computing Y = NOT[(A·B)+(C·D)]. This function is electrically identical across all CD4085B variants, including CD4085BF, and is confirmed in the SCHS060C datasheet Section 7.1. The AOI structure reduces gate count in sum-of-products logic synthesis, improving board density and reducing propagation path count in CD4085BF-based designs.

Is the CD4085BF RoHS compliant?

No, the CD4085BF is not RoHS compliant because it uses SnPb (tin-lead) lead finish, as documented in TI's Packaging Information table where CD4085BF is marked "No" under RoHS. This reflects its heritage as a military/aerospace-qualified part; RoHS-compliant alternatives like CD4085BE use NiPdAu finish and are marked "Yes" in the same table.

What is the maximum operating temperature for the CD4085BF?

The CD4085BF is rated for continuous operation from -55°C to +125°C, as specified in TI's Packaging Information table and confirmed in the SCHS060C datasheet Absolute Maximum Ratings section. This full military temperature range is enabled by its hermetic ceramic dual-in-line (CDIP) package and underlying CMOS process, distinguishing it from plastic-packaged variants that share the same electrical specs but lack long-term thermal stability validation.

Can the CD4085BF replace the CD4085BE in an existing design?

The CD4085BF can replace the CD4085BE electrically and functionally, as both share identical logic function, timing, and DC specifications. However, the CD4085BF uses a hermetic ceramic package with SnPb leads and requires wave-solder or hand-solder processes, whereas CD4085BE uses RoHS-compliant plastic DIP with reflow-compatible NiPdAu finish - so PCB assembly method and reliability requirements must be re-evaluated before substitution in CD4085BF-based builds.

Where is Pin 1 located on the CD4085BF package?

On the CD4085BF's 14-lead ceramic dual-in-line package (CDIP), Pin 1 is identified by a circular index mark adjacent to the lead-1 corner on the top surface of the ceramic body, as shown in TI's J0014A package outline drawing. When viewing the part with pins facing downward and the index mark at the top-left, Pin 1 is the leftmost pin in the top row - consistent with JEDEC-standard DIP orientation and verified in the CD4085BF3A.A ordering row documentation.