STMicroelectronics HCF4054BEY

Overview

HCF4054BEY from STMicroelectronics is a 4-segment liquid crystal display (LCD) driver with strobed latch function and independent level-shifting capability. It supports bidirectional voltage swing conversion (e.g., +5V/0V input to +5V/−5V output), delivers up to 36V_p-p AC drive across LCD segments via internal voltage doubling, operates from 3V to 20V supply, and features ≤100 nA input leakage at V_DD = 18V. It is used in portable 3½-digit LCD meter displays requiring ultra-low power and high-contrast segment drive.

For engineers reviewing the HCF4054BEY datasheet, HCF4054BEY pinout, HCF4054BEY application, or HCF4054BEY equivalent, key selection criteria include its strobe-controlled latching behavior, dual-rail output swing (V_EE to V_DD), DC/AC drive mode flexibility, and compatibility with HCF4055B/HCF4056B decoder systems for decimal point, colon, and polarity indicators.

Technical Context

The HCF4054BEY implements four independent strobed latches with common DF control, enabling synchronized update of segment outputs. Each channel accepts TTL/CMOS-level inputs (0–V_DD) and produces level-shifted outputs spanning V_EE to V_DD, supporting both unipolar DC and bipolar AC LCD drive modes.

Its logic diagram confirms full decoding of all 12 input states ("0–9", "L", "H", "P", "A", blank), with data latched on rising edge of STROBE and held static while STROBE is low. The DF output can be derived from any OUTx by tying corresponding INx low and STROBEx high - enabling programmable high-amplitude drive without external capacitors.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (0.3 inch width), JEDEC MS-001 compliant, lead pitch 2.54 mm, body width 7.1 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD segment driver applications.

Compared with CD4054BE and MAX6953, the HCF4054BEY uniquely combines guaranteed low-quiescent-current operation, independent per-segment strobing, and native DF-based AC drive - making it irreplaceable in legacy and low-power analog LCD meter designs requiring deterministic, capacitor-free segment excitation.

Availability

HCF4054BEY is available at Aetrix Electronics and suitable for portable digital multimeters, industrial panel meters, automotive battery testers, and medical diagnostic handhelds requiring stable component supply and long-term lifecycle support.

Supply support for HCF4054BEY 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with broad analog and mixed-signal portfolio coverage.

The HCF4054BEY belongs to ST's legacy B-series CMOS logic family, designed specifically for ultra-low-power, high-voltage LCD segment driving in battery-operated instrumentation where reliability and long-term availability are critical.

FAQ

Can HCF4054BEY drive both AC and DC LCD segments simultaneously?

Yes. By configuring individual STROBE inputs and applying DF signal only to selected OUT pins, the device can drive some segments with AC (via DF-modulated output) and others with static DC (latched high/low). This enables mixed-mode displays - e.g., dynamic digits with static unit labels - using a single IC without external switching.

What is the maximum safe VEE voltage when VDD = 20 V?

The absolute maximum rating specifies V_EE ≥ −0.5 V relative to V_SS, and V_SS may be tied to ground or floated. When V_DD = 20 V and V_SS = 0 V, V_EE must remain ≥ −0.5 V. However, for functional AC drive, V_EE is typically set to −5 V to −10 V with V_SS = 0 V, resulting in effective output swing of 25–30 V_p-p, well within safe operating limits.

How does the strobe latch behavior affect timing in multiplexed LCD systems?

Each STROBE input controls one OUT pin independently. In multiplexed systems, this allows sequential latching of digit planes - e.g., strobe OUT1 for digit 1, then OUT2 for digit 2 - eliminating crosstalk and ghosting. The minimum strobe pulse width is 70 ns at V_DD = 15 V, enabling >10 MHz update rates for high-speed scanning.

Is HCF4054BEY RoHS-compliant and halogen-free?

Yes. As a STMicroelectronics product manufactured after 2006 and conforming to JEDEC JESD13B, the HCF4054BEY meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. Full compliance documentation, including SDoC and material declarations, is available upon request from Aetrix Electronics.