STMicroelectronics HCF4511BEY

Overview

HCF4511BEY from STMicroelectronics is a BCD-to-7-segment latch/decoder/driver IC with CMOS input logic and bipolar NPN output transistors, designed to directly drive common-cathode LED displays. It features 4-bit BCD inputs (A–D), active-low Blanking (BL) and Lamp Test (LT) controls, Latch Enable/Strobe (LE), 7-segment outputs (a–g), ±25mA sourcing capability per segment, and operation across 3V to 20V supply range.

For engineers reviewing the HCF4511BEY datasheet, HCF4511BEY pinout, HCF4511BEY application, or HCF4511BEY equivalent, key selection considerations include its direct LED-driving capability, latch functionality for static display hold, blanking control for multiplexed systems, and compatibility with legacy 4500-series CMOS timing and logic families.

Technical Context

The HCF4511BEY integrates dual-technology architecture: high-noise-immunity CMOS logic for BCD decoding and latching, paired with saturated NPN bipolar output transistors capable of sourcing up to 25mA per segment. Its internal logic decodes valid BCD codes (0000–1001) into active-high 7-segment drive signals while blanking outputs for invalid codes (1010–1111).

Three dedicated control inputs-Latch Enable/Strobe (pin 5), Blanking (pin 4), and Lamp Test (pin 3)-enable real-time display management: LE captures and holds BCD input, BL forces all outputs low (blanking), and LT overrides decoding to force all segments high (full test illumination). Propagation delays range from 50ns (LT input) to 1320ns (data path) at VDD = 5V.

Key Specifications

Pinout & Package

HCF4511BEY is supplied in a 16-pin plastic DIP package (0.3-inch width), with lead finish compatible with standard through-hole reflow and wave soldering processes.

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 CD4511BE and MC14495P, HCF4511BEY uniquely combines high-current sourcing, full 3–20V operation, integrated latching, and true CMOS input compatibility - making it the only option supporting direct LED drive and static display hold in mixed-voltage industrial environments without added circuitry.

Availability

HCF4511BEY is available at Aetrix Electronics and suitable for industrial panel meters, legacy instrumentation displays, multiplexed digital clocks, and low-power status indicators requiring stable component supply and long-lifecycle support.

Supply support for HCF4511BEY 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 ICs with broad analog, digital, and mixed-signal portfolios.

HCF4511BEY belongs to ST's legacy HCF4000B series of high-voltage CMOS logic devices, engineered specifically for robust, low-power interfacing between digital controllers and electromechanical or optoelectronic peripherals in harsh industrial settings.

FAQ

What is the maximum supply voltage for reliable operation of HCF4511BEY?

HCF4511BEY is rated for continuous operation up to 20V VDD, with absolute maximum rating of +22V. All DC electrical specifications-including output drive, quiescent current, and noise margin-are guaranteed across 3V to 20V at temperatures from –55°C to +125°C. Operation above 20V voids specification compliance and risks permanent damage.

Can HCF4511BEY drive common-anode LED displays?

No. HCF4511BEY provides active-high, sourcing outputs designed exclusively for common-cathode 7-segment displays. Its outputs cannot sink current; attempting to connect to common-anode configurations will result in no illumination or potential latch-up. For common-anode use, a complementary device such as the HCF4543B (with active-low sinking outputs) is required.

How does the Latch Enable (LE) input behave during Blanking (BL) or Lamp Test (LT)?

When BL = L (active), all segment outputs are forced low regardless of LE state or BCD input - latching is effectively disabled. When LT = L, all outputs go high irrespective of LE or BL - latching is also overridden. Latching only occurs when both BL = H and LT = H, and a rising edge is applied to LE. This priority hierarchy ensures predictable display control during diagnostics or power-down.

Is HCF4511BEY RoHS-compliant and halogen-free?

Yes. HCF4511BEY (DIP-16 package) conforms to RoHS Directive 2011/65/EU and is manufactured with halogen-free molding compound. STMicroelectronics' official product change notification PCN-2017-003 confirms full compliance for this part number, including exemption 7a for lead in high-melting-temperature solder (Pb95Sn5) used in DIP lead finishes.