Nexperia USA Inc. HEF4543BT,652

Overview

HEF4543BT,652 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) inputs, seven buffered segment outputs (Qa–Qg), and operates across 3 V to 15 V supply range. It supports display inversion via PH control and provides latched decoding for stable digit presentation in instrumentation and panel meters.

For engineers reviewing the HEF4543BT,652 datasheet, HEF4543BT,652 pinout, HEF4543BT,652 application, or HEF4543BT,652 equivalent, key selection considerations include its wide VDD range (3–15 V), dual-mode display compatibility (LCD square-wave PH drive vs. LED common-anode/cathode configuration), latch functionality for static BCD hold, and guaranteed operation from –40 °C to +85 °C.

Technical Context

The HEF4543BT,652 integrates a 4-bit transparent latch and an 8-4-2-1 BCD-to-7-segment decoder in a single CMOS structure. Its PH input selects output polarity: HIGH enables common-anode LED drive or LCD backplane synchronization; LOW enables common-cathode LED operation. BL asserts all outputs LOW for display blanking, while LE controls latching of D0–D3 data on falling edge.

It delivers symmetrical output drive (±1.1 mA at VDD = 15 V, ±0.44 mA at VDD = 5 V) with propagation delays scaling inversely with supply voltage - e.g., Dn-to-Qn delay is 110 ns typical at VDD = 15 V and CL = 50 pF, versus 360 ns at VDD = 5 V. Static logic thresholds are rail-referenced: VIH ≥ 11.0 V (VDD = 15 V), VIL ≤ 4.0 V (VDD = 15 V).

Key Specifications

Pinout & Package

HEF4543BT,652 is housed in a 16-pin SO16 (SOT109-1) plastic small outline package with 3.9 mm body width and 1.27 mm lead pitch. The package is RoHS-compliant, surface-mountable, and rated for reflow per JEDEC J-STD-020.

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,652 uniquely balances wide supply range (3–15 V), integrated PH-controlled polarity inversion for LCD/LED versatility, industrial temperature qualification, and certified HBM/CDM ESD protection - making it the most flexible choice for mixed-display, cost-sensitive, and reliability-critical embedded instrumentation.

Availability

HEF4543BT,652 is available at Aetrix Electronics and suitable for industrial panel meters, digital multimeters, appliance control displays, and test equipment counters requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF4543BT,652 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 specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer markets.

The HEF4543BT,652 belongs to Nexperia's legacy CMOS logic family, engineered specifically for reliable, low-power display interface in harsh industrial environments - emphasizing latch stability, wide-VDD operation, and robust ESD immunity.

FAQ

Can HEF4543BT,652 drive common-anode and common-cathode LED displays without external components?

Yes. When PH = HIGH, outputs are active-low - directly compatible with common-anode LEDs. When PH = LOW, outputs are active-high - suitable for common-cathode LEDs. No external inverters or transistors are needed, provided segment current stays within ±3.6 mA (VDD = 15 V) or ±0.44 mA (VDD = 5 V).

What is the role of the PH input when driving an LCD display?

For LCDs, PH accepts a square-wave signal (typically 30–100 Hz) synchronized with the display's backplane drive. This AC coupling prevents electrolytic degradation of liquid crystal material. The HEF4543BT,652's outputs toggle in-phase or anti-phase with PH to generate the required segment-to-backplane voltage differential.

How does the latch enable (LE) input affect timing in multiplexed displays?

LE captures and holds the current D0–D3 BCD value on its falling edge. In multiplexed systems, this allows the microcontroller to update one digit's BCD code while other digits retain their latched values - eliminating cross-digit interference and ensuring stable, flicker-free display refresh.

Is external decoupling required for stable operation?

Yes. A 100 nF ceramic capacitor must be placed between VDD (pin 16) and VSS (pin 8), as close as possible to the IC. This suppresses supply ripple induced by rapid segment switching, preventing false triggering of internal logic and ensuring consistent output drive strength across all segments.