Texas Instruments CD4068BPW

Overview

CD4068BPW from Texas Instruments is an 8-input NAND gate CMOS logic IC in a 14-lead TSSOP package, operating across -55°C to +125°C, with typical propagation delay of 90 ns at 5 V and supply voltage range of 3 V to 18 V. It serves as a high-voltage, low-power combinational logic element in industrial control interface circuits.

For engineers reviewing the CD4068BPW datasheet, CD4068BPW pinout, CD4068BPW application, or CD4068BPW equivalent, this page delivers verified package dimensions, confirmed logic function, absolute maximum ratings, thermal reflow profile, and validated alternative options for legacy system redesigns and long-life industrial deployments.

Technical Context

The CD4068BPW implements a single 8-input NAND gate using standard CMOS process technology, with symmetrical input thresholds (V_DD/2) and rail-to-rail output swing. Its logic state transitions are fully static-no clock or timing constraints apply beyond propagation delay and setup/hold timing for cascaded logic stages.

Input protection includes diode clamps to V_DD and V_SS, enabling robust operation in noisy environments. Output drive capability is ±4.2 mA at V_DD = 15 V, supporting direct interfacing with TTL loads and other CD4000-series devices without level-shifting circuitry.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not electrically connected, RoHS-compliant NiPdAu finish, MSL Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-input NAND logic applications.

Compared with CD4068BPW, CD4068BPWR offers modern SMT logistics support while CD4068BNSR provides mechanical compatibility with broader SOP layouts - both retain identical logic function, timing, and environmental ratings, making them technically interchangeable where packaging permits.

Availability

CD4068BPW is available at Aetrix Electronics and suitable for industrial safety interlocks, automotive body control modules, and downhole instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4068BPW 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 industrial, automotive, and aerospace electronics.

The CD4068B series belongs to TI's legacy CMOS logic portfolio, designed specifically for high-voltage, wide-temperature, low-power digital control in mission-critical systems where reliability outweighs speed.

FAQ

What is the logic function implemented by the CD4068BPW?

The CD4068BPW implements a single 8-input NAND gate: its output is LOW only when all eight inputs (A–H) are HIGH; otherwise, the output is HIGH. This matches the Boolean expression Y = NOT(A·B·C·D·E·F·G·H). The CD4068BPW performs this function with rail-to-rail CMOS output swing and symmetric input thresholds, ensuring predictable behavior across its full 3 V to 18 V supply range.

Is the CD4068BPW pin-compatible with other CD4068B variants like CD4068BE or CD4068BNSR?

The CD4068BPW is not pin-compatible with CD4068BE (PDIP-14) or CD4068BNSR (SOP-14) due to differing package footprints and lead geometries - TSSOP-14 has 0.65 mm pitch and gull-wing leads, while PDIP uses 2.54 mm pitch through-hole pins and SOP uses 1.27 mm pitch. However, the CD4068BPW shares identical pin numbering and logic function with all CD4068B variants, so schematic symbol and netlist assignment remain consistent across packages.

What is the maximum operating temperature rating for the CD4068BPW?

The CD4068BPW is rated for operation from -55°C to +125°C, as confirmed in TI's Packaging Information documentation. This extended temperature range is achieved via qualified CMOS process and TSSOP packaging, making the CD4068BPW suitable for under-hood automotive, industrial control cabinets, and oilfield downhole tools where ambient temperatures exceed commercial-grade limits.

Does the CD4068BPW require external pull-up or pull-down resistors on unused inputs?

Yes - the CD4068BPW has no internal termination on any input. Unused inputs must be tied HIGH or LOW via discrete resistors (typically 10 kΩ to V_DD or V_SS) to prevent floating nodes, which can cause excessive supply current, oscillation, or unpredictable output states. Leaving inputs unconnected violates the absolute maximum ratings and risks device malfunction or accelerated wear.

Why is the CD4068BPW marked as Obsolete in TI's packaging addendum?

The CD4068BPW is marked Obsolete because Texas Instruments discontinued tube-packaged TSSOP variants in favor of tape-and-reel formats (e.g., CD4068BPWR) to support automated SMT assembly. While the CD4068BPW die and electrical specifications remain unchanged, TI no longer manufactures or stocks the tube version - Aetrix Electronics maintains limited legacy inventory for repair and continuity use, but new designs should specify CD4068BPWR or CD4068BNSR.