Texas Instruments CD4028BEG4

Overview

CD4028BEG4 from Texas Instruments is a BCD-to-decimal decoder/driver IC in a 16-lead PDIP package, operating across -55°C to +125°C, with supply voltage range 3 V to 18 V, and TTL/CMOS-compatible inputs. It converts 4-bit binary-coded decimal input into ten active-high decimal outputs for driving indicators or logic selection in digital control systems.

For engineers reviewing the CD4028BEG4 datasheet, CD4028BEG4 pinout, CD4028BEG4 application, or CD4028BEG4 equivalent, key selection considerations include its wide V_DD range, high noise immunity, direct LED-driving capability (up to 10 mA sink per output), and compatibility with legacy 4000B-series logic families in industrial and instrumentation designs.

Technical Context

The CD4028BEG4 implements combinational logic decoding using standard CMOS gate arrays to map BCD inputs (A–D) to ten mutually exclusive active-high outputs (0–9). Its internal structure includes input buffers with Schmitt-trigger hysteresis on all four inputs, enabling robust noise rejection in noisy environments.

Each output features a buffered driver stage capable of sourcing up to 0.5 mA or sinking up to 10 mA at V_DD = 15 V, supporting direct connection to LEDs or TTL loads without external transistors. The device exhibits typical propagation delays of 70 ns at V_DD = 10 V and 25°C, with no internal latching or clocking-functioning purely as a stateless combinatorial decoder.

Key Specifications

Pinout & Package

CD4028BEG4 is supplied in a 16-lead plastic dual-in-line package (PDIP-N), 0.300-inch body width, with standard through-hole mounting and JEDEC MS-001 compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4028BEG4, CD4028BM96 offers surface-mount compatibility and modern packaging, while MC14028BDR2G provides automotive-grade qualification and second-source assurance-neither is pin-compatible without layout change, but both deliver identical decoding functionality in updated form factors or certified environments.

Availability

CD4028BEG4 is available at Aetrix Electronics and suitable for industrial panel meters, digital test equipment, legacy instrumentation upgrades, and automotive diagnostic interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4028BEG4 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 ICs with broad industrial, automotive, and aerospace design expertise.

The CD4028BEG4 belongs to TI's legacy 4000B-series CMOS logic family, designed for robust, low-power, wide-voltage digital interfacing in harsh environments where reliability and longevity are critical.

FAQ

What is the maximum supply voltage rating for CD4028BEG4?

The CD4028BEG4 supports a maximum supply voltage of 18 V DC, with guaranteed operation across the full 3 V to 18 V range. This wide V_DD tolerance allows direct integration into systems powered by unregulated 12 V or 15 V rails without external regulation. Absolute maximum ratings specify 20 V as non-repetitive limit; sustained operation above 18 V may degrade long-term reliability. The CD4028BEG4 maintains consistent timing and output drive strength across this entire range.

Does CD4028BEG4 have built-in hysteresis on its inputs?

Yes, the CD4028BEG4 incorporates Schmitt-trigger input buffers on all four BCD inputs (pins 1, 2, 6, and 7), providing approximately 0.5 V of hysteresis. This design feature significantly improves noise immunity in electrically noisy environments such as industrial control panels or motor-drive adjacent circuitry. The hysteresis ensures clean, bounce-free transitions even with slow-rising or noisy input signals, eliminating the need for external RC filtering in most applications involving the CD4028BEG4.

Can CD4028BEG4 directly drive LEDs without external current-limiting components?

No - while the CD4028BEG4 can sink up to 10 mA per output at V_DD = 15 V, it requires an external current-limiting resistor when driving LEDs. The resistor must be placed between the LED anode and V_DD, with the LED cathode connected to the active-high output. Without this resistor, excessive current will flow and damage either the LED or the CD4028BEG4 output stage. Typical resistor values range from 330 Ω to 1.5 kΩ depending on V_DD and LED forward voltage, ensuring safe operation within the CD4028BEG4's specified sink capability.

Is CD4028BEG4 pin-compatible with other 4000B-series decoders like CD4028BE or CD4028BF?

Yes - CD4028BEG4 shares identical pinout, logic function, and DC/AC specifications with CD4028BE (plastic DIP) and CD4028BF (ceramic DIP). All three variants use the same 16-pin PDIP footprint and internal architecture; only packaging material (plastic vs. ceramic), lead finish (NiPdAu vs. SnPb), and RoHS compliance differ. Engineers may substitute CD4028BEG4 for CD4028BE in existing designs without layout or firmware changes, provided the extended temperature range (-55°C to +125°C) meets system requirements.

What is the quiescent current consumption of CD4028BEG4 at 12 V supply?

The CD4028BEG4 draws a maximum quiescent current of 100 nA at V_DD = 18 V and 25°C, and remains below 200 nA across its full operating temperature range (-55°C to +125°C) and supply range (3–18 V). At 12 V, typical I_DD is less than 50 nA. This ultra-low static power enables use in always-on monitoring circuits, battery-backed status indicators, and energy-sensitive instrumentation where standby current must remain sub-microamp - a key advantage distinguishing the CD4028BEG4 from bipolar decoder alternatives.