Texas Instruments CD4028BF3A

Overview

CD4028BF3A from Texas Instruments is a CMOS BCD-to-decimal decoder/driver IC in a 16-lead ceramic dual-in-line package (CDIP), operating across -55°C to +125°C, with supply voltage range 3V–18V, propagation delay ≤100 ns at 5V, and TTL/CMOS-compatible inputs. It converts 4-bit BCD input into ten active-high decimal outputs for driving indicators or logic selection in industrial control panels.

For engineers reviewing the CD4028BF3A datasheet, CD4028BF3A pinout, CD4028BF3A application, or CD4028BF3A equivalent, key selection criteria include its wide V_DD range, high noise immunity, latch-up immunity, and compatibility with legacy 4000-series logic families in harsh-temperature environments.

Technical Context

The CD4028BF3A implements combinational logic decoding using static CMOS circuitry, with no internal latching-outputs respond directly to BCD input changes. All ten outputs are fully buffered, capable of sourcing/sinking ≥4.2 mA at V_DD = 15 V, and feature Schmitt-triggered inputs for noise rejection on slow-rising signals.

It requires no external components for operation and supports direct interface to LEDs, relays, or subsequent logic stages without level-shifting. Input thresholds scale with V_DD, ensuring consistent logic behavior across its full supply range.

Key Specifications

Pinout & Package

CD4028BF3A is housed in a hermetic 16-lead ceramic dual-in-line package (CDIP-J), with 0.3-inch body width, 0.1-inch lead pitch, and SNPB (tin-lead) terminations. The package is RoHS-exempt and rated for high-reliability, long-lifecycle deployments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD-to-decimal decoder applications.

Compared with CD4028BE and CD4028BM96, the CD4028BF3A delivers unique value in mission-critical systems via its hermetic ceramic construction, extended temperature range, and SNPB solderability - making it the sole choice for MIL-PRF-38535-compliant designs where field longevity and environmental resilience are non-negotiable.

Availability

CD4028BF3A is available at Aetrix Electronics and suitable for industrial panel meters, military display systems, legacy equipment repair, and high-reliability data loggers requiring stable component supply across extended temperature and long lifecycle programs.

Supply support for CD4028BF3A 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial/military qualification.

The CD4028B series belongs to TI's legacy 4000B CMOS logic family, designed specifically for high-noise-immunity, wide-supply, and extended-temperature digital control in aerospace, defense, and industrial infrastructure.

FAQ

What is the maximum clock or input signal frequency supported by CD4028BF3A?

The CD4028BF3A is a combinational decoder-not a clocked device-so it has no maximum clock frequency. Its usable input transition rate depends on propagation delay and rise/fall times: at V_DD = 15 V, typical propagation delay is 40 ns, supporting BCD input updates up to ~10 MHz in practice. For CD4028BF3A, ensure input edges exceed 1 V/µs slew rate to avoid metastability near switching thresholds.

Does CD4028BF3A require external pull-up resistors on its outputs?

No, CD4028BF3A does not require external pull-up resistors. Its outputs are fully buffered CMOS totem-pole drivers capable of sourcing and sinking current (±4.2 mA at 15 V). Pull-ups are unnecessary unless driving open-collector loads or interfacing with non-CMOS inputs requiring specific voltage levels beyond V_DD.

Is CD4028BF3A pin-compatible with the older CD4028B-MIL variant?

Yes, CD4028BF3A is pin-compatible with CD4028B-MIL. Both use identical 16-pin CDIP (J) packaging, share the same pinout, electrical specifications, and truth table. The CD4028BF3A is the commercial-off-the-shelf (COTS) version qualified to the same military temperature range (-55°C to +125°C), though CD4028B-MIL carries additional QML-38535 certification for flight-critical applications.

Can CD4028BF3A drive standard 7-segment LED displays directly?

CD4028BF3A can drive single-digit 7-segment LED displays only if configured with external current-limiting resistors per segment and used in multiplexed mode. Its outputs are active-HIGH decimal drivers (0–9), not segment drivers. To drive 7-segment displays, pair CD4028BF3A with a dedicated 7-segment decoder (e.g., CD4511) or use discrete logic to map decimal outputs to segment enable lines.

What is the meaning of the "F3A" suffix in CD4028BF3A?

The "F3A" suffix in CD4028BF3A denotes Texas Instruments' standardized packaging code: "F" indicates ceramic dual-in-line package (CDIP), "3" specifies hermetic sealing, and "A" identifies the revision level and lead finish (SNPB). This suffix distinguishes it from plastic (E), SOIC (M), or TSSOP (PW) variants while confirming compliance with MIL-STD-883 screening for high-reliability applications.