NXP Semiconductors HEF4543BP,652

Overview

HEF4543BP,652 from Nexperia is a CMOS BCD-to-7-segment latch/decoder/driver IC designed for direct interface to 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 with guaranteed operation from –40 °C to +85 °C.

For engineers reviewing the HEF4543BP,652 datasheet, HEF4543BP,652 pinout, HEF4543BP,652 application, or HEF4543BP,652 equivalent, this device serves as a static, latch-enabled display driver supporting both common-cathode and common-anode LED configurations as well as AC-driven LCDs - critical for embedded instrumentation, digital panel meters, and industrial HMI readouts requiring stable segment-level control without external decoding logic.

Technical Context

The HEF4543BP,652 integrates a 4-bit transparent latch and an 8-4-2-1 BCD decoder in a single CMOS circuit, enabling storage of BCD data prior to segment output activation. Its PH input selects output polarity: LOW for common-cathode LEDs and HIGH for common-anode LEDs or LCD backplane synchronization.

BL enables full display blanking independent of latch state, while LE controls when new BCD data is latched into the internal register. The device supports dynamic operation up to 15 MHz at 15 V (tPLH/tPHL ≤ 60 ns typical), with output drive capability of ±3.6 mA at 15 V and low static current (≤ 600 μA max at 15 V).

Key Specifications

Pinout & Package

HEF4543BP,652 is housed in a plastic small outline package (SO16) per SOT109-1 standard: 16-pin, 3.9 mm body width, surface-mountable with 1.27 mm pitch. Pin 1 is marked by a notch or dot; package complies with JEDEC MS-012 and RoHS requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4543BE and 74HC4543, the HEF4543BP,652 uniquely combines latch, blanking, and configurable phase control in a single 3–15 V device - making it the only option for industrial LED/LCD hybrid displays requiring glitch-free updates, wide supply tolerance, and hardware-level blanking without software intervention.

Availability

HEF4543BP,652 is available at Aetrix Electronics and suitable for digital instrumentation, industrial HMI panels, and test equipment requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF4543BP,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 focused on high-volume, high-reliability logic, analog, and MOSFET components for automotive, industrial, and consumer markets.

The HEF4543BP,652 belongs to Nexperia's legacy 4000B-series logic family, engineered specifically for robust, low-power display interfacing in harsh industrial environments where supply variation and EMI resilience are critical.

FAQ

What is the function of the PH pin on the HEF4543BP,652?

The PH (phase) pin on the HEF4543BP,652 controls output polarity: when PH = LOW, outputs are active-HIGH for common-cathode LED displays; when PH = HIGH, outputs are active-LOW for common-anode LEDs or synchronized to LCD backplane square waves. This eliminates external inverters and enables single-IC support for multiple display technologies. The HEF4543BP,652 datasheet specifies PH must be driven with clean logic levels - floating or intermediate voltages cause undefined segment states.

Can the HEF4543BP,652 drive common-anode LED displays directly?

Yes, the HEF4543BP,652 can drive common-anode LED displays directly when PH = HIGH, which configures outputs as active-LOW. Each segment output (Qa–Qg) delivers up to 3.6 mA sink current at 15 V, sufficient for standard 20 mA LED segments when used with appropriate current-limiting resistors. The HEF4543BP,652 does not require external transistors for typical indicator LEDs, though bipolar buffers are recommended for higher-current or multiplexed applications per Nexperia Application Note AN10752.

What happens to segment outputs when BL = HIGH on the HEF4543BP,652?

When BL (blanking) = HIGH on the HEF4543BP,652, all seven segment outputs (Qa–Qg) are forced LOW regardless of latch content or PH state - effectively blanking the display. This action is immediate and overrides all other inputs except VDD/VSS. The HEF4543BP,652 maintains its internal latch state during blanking, so display resumes instantly upon BL returning LOW. This feature enables flicker-free digit multiplexing and emergency display shutdown.

Is the HEF4543BP,652 pin-compatible with older 4543 variants like the HEF4543BT?

Yes, the HEF4543BP,652 shares identical SO16 (SOT109-1) pinout and electrical behavior with HEF4543BT and HEF4543B, including identical pin numbering, function mapping, and DC/AC specifications. Both are manufactured by Nexperia and conform to the same Rev. 9 datasheet. The HEF4543BP,652 differs only in packaging traceability and reel specification - not in logic, timing, or drive capability - making it a direct drop-in replacement in existing designs.

How does the latch enable (LE) input affect timing in the HEF4543BP,652?

The LE input on the HEF4543BP,652 is active-LOW and controls data capture: a HIGH-to-LOW transition latches the current D0–D3 BCD value into the internal register, freezing segment outputs until the next LE pulse. While LE is HIGH, outputs follow D0–D3 changes transparently. The HEF4543BP,652 requires minimum LE pulse width of 20 ns at 15 V (per Table 7), and setup/hold times of 15 ns/20 ns for Dn relative to LE edge - ensuring reliable capture in synchronous microcontroller interfaces.