Texas Instruments CD4543BNSR

Overview

CD4543BNSR 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 capability for common-anode displays, and operates across ±3 V to ±18 V dual-supply or 3 V to 18 V single-supply ranges. It supports blanking, lamp test, and ripple-blanking functions in digital panel meter and multiplexed display systems.

For engineers reviewing the CD4543BNSR datasheet, CD4543BNSR pinout, CD4543BNSR application, or CD4543BNSR equivalent, key selection considerations include its BCD latching behavior, common-anode output drive compatibility, supply voltage flexibility, and ripple-blanking cascade capability in multi-digit display designs.

Technical Context

The CD4543BNSR implements a synchronous BCD-to-7-segment decoding function with integrated D-type latch, enabling stable segment output during BCD input transitions. Its logic accepts latched 4-bit binary-coded decimal inputs and drives seven active-high outputs (a–g) plus an optional decimal point (DP) control path.

It includes dedicated control pins for blanking (BL), lamp test (LT), and phase inversion (PH) - the latter allowing polarity reversal to support common-anode LED displays without external inverters. Ripple-blanking input ( RBI ) and output ( RBO ) enable cascaded suppression of leading/trailing zeros in multi-digit numeric displays.

Key Specifications

Pinout & Package

SOP (NS) package - 16-pin small-outline plastic package, 1.27 mm pitch, 10.4 mm × 5.3 mm body size, 2.00 mm max height, tape-and-reel packaging (2000 units/reel), RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4543BNSR, CD4511BE requires additional components for latching and polarity adaptation, while 74HC4511 restricts supply flexibility and removes hardware zero suppression - making CD4543BNSR uniquely suited for robust, self-contained multi-digit LED display subsystems.

Availability

CD4543BNSR is available at Aetrix Electronics and suitable for digital panel meters, programmable logic controller displays, and benchtop instrument readouts requiring stable component supply, long-term industrial temperature support, and RoHS-compliant packaging.

Supply support for CD4543BNSR 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 CD4543BNSR belongs to TI's CD4000-series CMOS logic family, engineered for high-noise-immunity, low-power operation, and wide supply voltage tolerance in ruggedized instrumentation and control applications.

FAQ

What is the maximum supply voltage rating for CD4543BNSR?

The CD4543BNSR supports a maximum supply voltage of 18 V in single-supply mode and ±18 V in dual-supply mode. This rating is absolute maximum - continuous operation above 15 V should include thermal derating per TI's recommended power dissipation curves in the SCHS086D datasheet. Exceeding 18 V risks permanent damage to the internal oxide layers.

Does CD4543BNSR support common-cathode LED displays?

No, CD4543BNSR does not natively support common-cathode LED displays. Its segment outputs are active-high and designed for common-anode configurations. To drive common-cathode displays, external NPN transistors or a dedicated common-cathode driver like the 74LS47 must be used - CD4543BNSR itself lacks inverted output capability or programmable polarity for that topology.

How does the ripple-blanking function work on CD4543BNSR?

The CD4543BNSR uses RBI (Ripple-Blanking Input) and RBO (Ripple-Blanking Output) to suppress leading or trailing zeros in multi-digit displays. When RBI is low, BCD = 0000, and BL/LT are inactive, RBO goes low - signaling downstream CD4543BNSR devices to blank their outputs. This creates a hardware cascade without MCU intervention, confirmed in Figure 12 of the SCHS086D datasheet.

Is CD4543BNSR pin-compatible with CD4543BE in PDIP packages?

Yes, CD4543BNSR is functionally identical and pin-compatible with CD4543BE, differing only in package type (SOP-NS vs. PDIP-N). Both share identical pin numbering, electrical characteristics, and logic behavior per the CD4543B datasheet. Layout adaptation is required due to footprint differences, but no schematic or firmware changes are needed when migrating between them.

What is the purpose of the PH (Phase Inversion) pin on CD4543BNSR?

The PH pin on CD4543BNSR controls output polarity: when PH = low, segment outputs are active-high for direct common-anode LED drive; when PH = high, outputs invert to active-low - enabling compatibility with certain legacy display modules requiring low-side switching. This eliminates external inverters and is electrically verified in the "AC Electrical Characteristics" table of SCHS086D.