Texas Instruments CD4543BEG4

Overview

CD4543BEG4 from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder driver IC designed for direct LED display interfacing. It features latched BCD input, active-high segment outputs, phase inversion control for common-anode displays, and operates across ±3 V to ±18 V supply rails. It supports blanking, lamp test, and polarity selection in 16-pin PDIP packaging.

For engineers reviewing the CD4543BEG4 datasheet, CD4543BEG4 pinout, CD4543BEG4 application, or CD4543BEG4 equivalent, this page delivers verified functional specifications, package dimensions, real-world use cases in digital instrumentation, and validated alternative options for display driver design.

Technical Context

The CD4543BEG4 implements a synchronous latch followed by a 4-bit BCD-to-7-segment decoder with active-high outputs. Its logic accepts latched BCD inputs (A–D), processes them through combinational decoding, and drives segments a–g with current-sinking capability suitable for common-anode LEDs.

It includes dedicated control inputs: BL (blanking), LT (lamp test), and PH (phase inversion). BL forces all outputs low; LT overrides normal operation to drive all segments high; PH selects output polarity-low for common-anode (default) or high for common-cathode when inverted via external logic.

Key Specifications

Pinout & Package

CD4543BEG4 is supplied in a 16-lead plastic dual-in-line package (PDIP-N), 0.3-inch width, with standard 0.1-inch pin pitch and 0.1-inch row spacing. Pin 1 is located at the top-left corner with notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD-to-7-segment driver applications.

Compared with CD4543BEG4, CD4543BM96 offers SMT compatibility at identical logic functionality but requires layout change, while CD4543BNSR provides SOP packaging with matching pinout yet distinct mechanical envelope - both retain full electrical equivalence but differ in manufacturability and thermal response.

Availability

CD4543BEG4 is available at Aetrix Electronics and suitable for digital panel meters, industrial control displays, and test equipment readouts requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4543BEG4 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 communications markets.

The CD4543BEG4 belongs to TI's CD4000-series CMOS logic family, engineered for robust operation in harsh environments and designed specifically for direct LED display interfacing in instrumentation and control systems.

FAQ

What is the supply voltage range supported by the CD4543BEG4?

The CD4543BEG4 operates from ±3 V to ±18 V in dual-supply mode or +3 V to +18 V in single-supply configuration. This wide range allows direct integration with legacy ±15 V analog circuits, modern 5 V microcontrollers, and battery-powered instruments without level-shifting components. The CD4543BEG4 maintains specified timing and drive strength across the full range.

Does the CD4543BEG4 support common-cathode LED displays?

Yes - the CD4543BEG4 supports common-cathode displays via its PH (phase inversion) input. When PH is driven high, segment outputs invert polarity, enabling direct connection to common-cathode LEDs. Note that external current-limiting resistors remain required, and the CD4543BEG4's active-high outputs source current in this mode rather than sink it.

How does the lamp test function work on the CD4543BEG4?

The lamp test (LT) input on the CD4543BEG4 is active-low. When asserted, it overrides normal decoding and forces all segment outputs (a–g) high regardless of BCD input state. This allows full visual verification of LED segments and interconnect integrity without requiring host controller intervention - a key feature for factory calibration and field service of the CD4543BEG4.

Is the CD4543BEG4 pin-compatible with earlier CD4543B variants?

Yes - the CD4543BEG4 is fully pin-compatible and functionally identical to the base CD4543BE and CD4543BEE4 variants. All share the same PDIP-16 package, identical pinout, electrical specifications, and timing behavior. The "G4" suffix denotes TI's green packaging standard (RoHS-compliant, NiPdAu lead finish), with no functional or mechanical deviation from prior versions.

What is the maximum output current per segment for the CD4543BEG4?

The CD4543BEG4 delivers up to 10 mA sink current per segment at V_DD = 15 V and 25 °C, with guaranteed minimum of 6.8 mA across −55 °C to +125 °C. This allows direct driving of standard low-current LEDs; for higher-brightness displays, external transistor buffers or current-regulated drivers may be added while retaining the CD4543BEG4's logic and timing control.