Nexperia USA Inc. HEF4543BT,653

Overview

HEF4543BT,653 from Nexperia is a CMOS BCD-to-7-segment latch/decoder/driver IC designed for direct interface with LCD and LED displays. It features four BCD inputs (D0–D3), active-low latch enable (LE), active-high blanking (BL) and phase (PH) control, seven buffered segment outputs (Qa–Qg), and operates across 3 V to 15 V supply range. It supports common-cathode and common-anode LED displays and drives liquid crystal displays using external square-wave PH input.

For engineers reviewing the HEF4543BT,653 datasheet, HEF4543BT,653 pinout, HEF4543BT,653 application, or HEF4543BT,653 equivalent, key selection criteria include its wide VDD range (3–15 V), latch+decode+drive integration, PH-controlled polarity inversion for LCD biasing, and SO16 package compatibility with legacy 4000-series logic footprints.

Technical Context

The HEF4543BT,653 integrates a 4-bit transparent latch, an 8-4-2-1 BCD-to-7-segment decoder, and seven high-drive CMOS output buffers in a single monolithic structure. Its PH input enables dynamic polarity reversal of segment outputs-critical for AC-driven LCDs-while BL provides synchronous display blanking and LE controls latching of BCD data on falling edge.

It implements static CMOS logic with no internal clock; all timing is asynchronous and governed by propagation delays (e.g., Dn→Qn: 55–360 ns depending on VDD and load). Input thresholds scale with VDD (VIH = 0.7×VDD min; VIL = 0.3×VDD max), ensuring robust noise immunity across its full operating range.

Key Specifications

Pinout & Package

HEF4543BT,653 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; pins are numbered counterclockwise from top-left corner when viewed from top with marking side up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4543BE and 74HC4543, the HEF4543BT,653 uniquely combines wide-supply operation (3–15 V), integrated PH-controlled polarity inversion for LCDs, and industrial-grade ESD/temperature specs-making it the only option supporting both legacy 15 V systems and modern low-power LCD instrumentation.

Availability

HEF4543BT,653 is available at Aetrix Electronics and suitable for digital panel meters, industrial control displays, portable instrumentation, and legacy equipment upgrades requiring stable component supply and long-lifecycle assurance.

Supply support for HEF4543BT,653 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The HEF4543BT,653 belongs to Nexperia's legacy-compatible logic family, engineered specifically for display interface applications where latch stability, multi-voltage operation, and LCD/LED flexibility are critical design requirements.

FAQ

Can HEF4543BT,653 drive common-anode LED displays?

Yes. Set PH = HIGH to invert segment outputs, enabling direct connection to common-anode LEDs. Each output (Qa–Qg) sinks current when active, matching the cathode-side switching requirement. At 5 V, typical sink current is 3.6 mA, sufficient for standard indicator LEDs without external drivers.

What is the minimum pulse width required on the LE pin?

The minimum LE HIGH pulse width is 10 ns at 15 V, 20 ns at 10 V, and 60 ns at 5 V. This ensures reliable capture of BCD data into the internal latch. For robust operation across voltage and temperature, maintain ≥100 ns pulse width in designs targeting -40 °C to +85 °C operation.

How does the PH input affect LCD versus LED operation?

For LCDs, PH accepts a square-wave (20–100 Hz) to generate AC bias across segments and backplane; for common-cathode LEDs, PH = LOW maintains standard active-HIGH segment drive; for common-anode LEDs, PH = HIGH inverts outputs to active-LOW drive. No external components are needed to configure these modes.

Is a decoupling capacitor required on VDD?

Yes. A 100 nF ceramic capacitor placed within 5 mm of pin 16 (VDD) and pin 8 (VSS) is mandatory to suppress switching noise and prevent output glitches during segment transitions. Without it, propagation delay variation and false blanking may occur under dynamic load conditions.