Texas Instruments CD4543BM96

Overview

CD4543BM96 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 active-low 7-segment outputs (a–g), and includes phase control for common-anode displays. Operating from 3 V to 18 V with ±10 mA output drive per segment, it supports multiplexed or static LED applications in industrial panel meters and instrumentation.

For engineers reviewing the CD4543BM96 datasheet, CD4543BM96 pinout, CD4543BM96 application, or CD4543BM96 equivalent, key selection considerations include its BCD latching capability, active-low open-drain outputs, phase-selectable logic polarity, wide supply range, and SOIC-16 packaging suitable for space-constrained PCB layouts.

Technical Context

The CD4543BM96 implements a synchronous latch followed by a BCD-to-7-segment decoder with built-in phase inversion control (PH pin) to support both common-anode and common-cathode LED configurations. Its output stage uses buffered open-drain NMOS transistors capable of sinking up to 10 mA per segment at V_DD = 15 V.

Logic operation is fully static CMOS, enabling zero static power consumption and noise immunity over the full −55°C to +125°C temperature range. Input thresholds scale with V_DD, ensuring compatibility across 3 V to 18 V supply rails without level-shifting circuitry.

Key Specifications

Pinout & Package

CD4543BM96 is housed in a 16-pin SOIC (D) package measuring 10.4 mm × 5.3 mm × 1.75 mm (max height), RoHS-compliant, with NIPDAU lead finish and moisture sensitivity level 1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4511BE and 74HC4511, the CD4543BM96 uniquely combines latched BCD input, phase-selectable output polarity, and 3–18 V operation - making it the only option supporting direct common-anode/cathode LED drive across industrial voltage rails without auxiliary components.

Availability

CD4543BM96 is available at Aetrix Electronics and suitable for industrial panel meters, appliance control displays, and test equipment front panels requiring stable component supply, long-lifecycle availability, and RoHS-compliant SOIC packaging.

Supply support for CD4543BM96 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 ICs, with decades of heritage in CMOS logic and industrial interface solutions.

The CD4543BM96 belongs to TI's CD4000B series of radiation-tolerant, wide-supply CMOS logic devices, originally designed for high-reliability instrumentation, aerospace, and industrial control systems requiring extended temperature and voltage operation.

FAQ

What is the maximum supply voltage rating for CD4543BM96?

The CD4543BM96 is rated for operation up to 18 V DC on the V_DD pin. Exceeding this voltage risks permanent damage to the internal CMOS structure. At 18 V, segment outputs can sink up to 10 mA each, enabling direct drive of high-brightness LEDs without external transistors. Always use a 0.1 µF ceramic decoupling capacitor between V_DD and V_SS within 10 mm of the CD4543BM96 package.

Does CD4543BM96 support common-cathode LED displays?

Yes, the CD4543BM96 supports common-cathode LED displays when the PH (Phase) pin is held low. In this mode, segment outputs behave as active-high sources - but because they are open-drain, external pull-up resistors to V_DD or a separate LED supply are required. The CD4543BM96 does not provide internal pull-ups, so proper resistor sizing (e.g., 330 Ω for 10 mA at 5 V) is essential for correct brightness and current limiting.

Can CD4543BM96 be used without a microcontroller?

Yes, the CD4543BM96 can operate standalone using discrete logic or DIP switches for BCD input. Its latch enable (LE) pin allows manual or clock-driven sampling of BCD data, and the BL (blank) pin enables hardware-based display control. For example, a 555 timer can generate LE pulses while thumbwheel switches set BCD inputs - enabling simple, firmware-free numeric displays in maintenance tools or calibration fixtures using only the CD4543BM96 and passive components.

What is the purpose of the BL (Blank) pin on CD4543BM96?

The BL (Blank) pin on CD4543BM96 is an active-low global blanking input that forces all seven segment outputs (a–g) into high-impedance state, regardless of latch or BCD input status. This feature enables flicker-free digit multiplexing, power-saving display shutdown, or synchronization with system reset events. When BL is high, normal decoding proceeds; when pulled low, no segment current flows - making it ideal for dynamic contrast control or EMI reduction during sensitive measurement windows in the CD4543BM96 application.

Is CD4543BM96 pin-compatible with CD4543BE (PDIP-16)?

No, CD4543BM96 is not pin-compatible with CD4543BE in terms of physical layout - though both share identical pin functions and electrical behavior. CD4543BM96 uses a 16-pin SOIC (D) package with 1.27 mm pitch, while CD4543BE uses a 16-pin PDIP (N) package with 2.54 mm pitch. PCB footprints differ significantly; direct replacement requires adapter board or layout revision. However, logic-level timing, input/output definitions, and functional behavior are fully identical between CD4543BM96 and CD4543BE.