Texas Instruments CD4543BEE4

Overview

CD4543BEE4 from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder driver IC designed for direct LED display interfacing. It accepts 4-bit BCD input, latches data, decodes to 7-segment outputs (a–g), and features phase control for common-anode displays, with supply voltage range of 3 V to 18 V and operating temperature from –55 °C to +125 °C.

For engineers reviewing the CD4543BEE4 datasheet, CD4543BEE4 pinout, CD4543BEE4 application, or CD4543BEE4 equivalent, key selection considerations include its active-high latch enable, phase-selectable output polarity, built-in lamp test and blanking functions, and compatibility with TTL-level inputs across wide V_DD.

Technical Context

The CD4543BEE4 implements a synchronous latch followed by a BCD-to-7-segment decoder with active-low outputs optimized for common-anode LEDs. Its PH (phase) input selects output inversion to match display anode/cathode topology without external inverters.

Lamp test (LT) forces all segment outputs high when asserted, while blanking (BL) disables all outputs regardless of latch state. Input logic thresholds are compatible with both CMOS and TTL families over the full supply range.

Key Specifications

Pinout & Package

CD4543BEE4 is housed in a 16-pin plastic dual-in-line package (PDIP-N), with 0.3-inch body width, through-hole mounting, and industry-standard lead spacing (2.54 mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4543BEE4, CD4511BE omits phase control-limiting display topology flexibility-while MC14495P matches functionality but sacrifices extended temperature qualification, making CD4543BEE4 the sole option for full –55 °C to +125 °C operation with integrated PH support.

Availability

CD4543BEE4 is available at Aetrix Electronics and suitable for industrial panel meters, appliance control displays, and test equipment counters requiring stable component supply, long-term lifecycle support, and extended-temperature performance.

Supply support for CD4543BEE4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The CD4543BEE4 belongs to TI's legacy CMOS 4000-series logic family, engineered for robust, low-power, wide-supply digital interface functions in harsh environments and legacy system upgrades.

FAQ

What is the primary function of the CD4543BEE4?

The CD4543BEE4 is a CMOS BCD-to-7-segment latch/decoder driver IC. It accepts a 4-bit BCD input, latches the data on the LE (latch enable) signal, decodes it into seven active-low outputs (a–g), and includes PH (phase) control to invert outputs for common-anode or common-cathode LED displays. The CD4543BEE4 also integrates lamp test (LT) and blanking (BL) functions for display diagnostics and multiplexing control.

Does the CD4543BEE4 support TTL-level inputs?

Yes, the CD4543BEE4 supports TTL-level inputs across its full 3 V to 18 V supply range. Input thresholds are designed to reliably recognize standard TTL logic levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), enabling direct interfacing with microcontrollers, FPGAs, and legacy TTL logic without level-shifting circuitry. This compatibility is confirmed in the official Texas Instruments CD4543B datasheet (SCHS086D).

What is the purpose of the PH (phase) pin on the CD4543BEE4?

The PH (phase) pin on the CD4543BEE4 selects output polarity to match display topology: when PH = V_SS, outputs are non-inverted (suitable for common-cathode displays); when PH = V_DD, outputs are inverted (suitable for common-anode displays). This eliminates the need for external inverters or redesign when switching between display types. The CD4543BEE4's PH function is explicitly defined in its truth table and functional description in the TI datasheet.

Can the CD4543BEE4 drive LEDs directly?

Yes, the CD4543BEE4 can drive standard low-current LEDs directly via its active-low 7-segment outputs, which sink up to 10 mA per segment at V_DD = 5 V (typical). For higher-brightness or high-current LEDs, external current-limiting resistors are required per segment. The CD4543BEE4's output structure and drive capability are fully characterized in the "Electrical Characteristics" section of the TI datasheet.

Is the CD4543BEE4 RoHS compliant?

Yes, the CD4543BEE4 is RoHS compliant, as confirmed in Texas Instruments' official packaging documentation (Package Option Addendum, 11-Nov-2025). It carries NIPDAU (nickel-palladium-gold) lead finish and meets JEDEC J-STD-020 moisture sensitivity Level-1 requirements. RoHS compliance applies to all currently active orderable variants including CD4543BEE4, and is verified per TI's public environmental compliance statements.