Texas Instruments CD4055BE

Overview

CD4055BE from Texas Instruments is a BCD-to-7-segment latch/decoder/driver IC designed for direct LED display interfacing in low-power digital systems. It features active-low outputs, latched BCD input (A–D), blanking (BL), phase (PH), and strobe (ST) control inputs, operates over –55°C to +125°C, and supports 3V–18V supply voltage - enabling use in industrial panel meters and legacy instrumentation displays.

For engineers reviewing the CD4055BE datasheet, CD4055BE pinout, CD4055BE application, or CD4055BE equivalent, this page delivers verified package mapping (PDIP-16), confirmed logic function (BCD-to-7-segment with latch and phase control), thermal rating (–55°C to +125°C), supply range (3V–18V), and functional distinction from CD4054B (non-latching) and CD4056B (common-cathode only).

Technical Context

The CD4055BE implements a synchronous BCD-to-7-segment decoding architecture with integrated D-type latch, allowing stable segment output hold during input transitions. Its PH input enables multiplexed display operation by toggling segment polarity per half-cycle, supporting common-anode LED configurations via external current-limiting resistors.

Unlike CD4054B (no latch, no PH), CD4055BE provides data retention and dual-phase drive capability; unlike CD4056B (common-cathode only, no PH), it supports common-anode LEDs and includes blanking (BL) for display dimming or digit suppression without external gating.

Key Specifications

Pinout & Package

CD4055BE is supplied in a 16-pin plastic dual-in-line package (PDIP-N), 19.1 mm × 6.6 mm body, 2.54 mm pitch, with pin 1 index located at top-left corner. The package is RoHS-compliant, lead-finished with NiPdAu, and rated for –55°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4056BE and MC14495P, the CD4055BE uniquely combines latched BCD input, phase-controlled common-anode drive, and wide-voltage operation - making it irreplaceable in AC-multiplexed industrial and avionics displays where reliability and topology flexibility are mandatory.

Availability

CD4055BE is available at Aetrix Electronics and suitable for industrial panel meters, legacy test equipment refurbishment, and avionics annunciator systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4055BE 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

Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and aerospace qualifications.

The CD4055BE belongs to TI's legacy CMOS 4000-series logic family, engineered for robustness in high-noise, wide-temperature, and mixed-voltage environments - specifically targeting display subsystems in mission-critical instrumentation.

FAQ

What is the primary function of the CD4055BE?

The CD4055BE is a BCD-to-7-segment latch/decoder/driver IC with active-low outputs, designed to convert 4-bit binary-coded decimal inputs into segment signals for common-anode LED displays. It includes a strobe (ST) input to latch BCD data, a phase (PH) input to alternate output polarity for AC drive, and a blanking (BL) input to disable all segments. Its function is explicitly defined in the Harris/TI datasheet SCHS048C and distinguishes it from non-latching (CD4054B) or common-cathode-only (CD4056B) variants.

Does the CD4055BE support common-cathode LED displays?

No, the CD4055BE does not support common-cathode LED displays natively. Its outputs are active-low and intended to sink current into the anodes of common-anode LEDs. Driving common-cathode displays would require external inverters or transistor-level reconfiguration, which is neither specified nor validated in the CD4055BE datasheet. For common-cathode applications, CD4056BE is the functionally matched alternative.

What is the purpose of the PH (phase) input on the CD4055BE?

The PH input on the CD4055BE toggles the polarity of all segment outputs each time it changes state, enabling AC-coupled drive of common-anode LEDs. This reduces DC current stress on LEDs and associated resistors, extends display lifetime, and minimizes visible flicker in multiplexed systems. The PH function is documented in the "Functional Description" section of the SCHS048C datasheet and is unique to CD4055BE within the CD4054B/CD4055B/CD4056B family.

Is the CD4055BE still in active production?

No - according to TI's official Packaging Information document dated 15-Jul-2026, the CD4055BE is marked as "Obsolete" with no active production status, tube packaging, or RoHS compliance noted. However, Aetrix Electronics maintains legacy inventory and traceable sources for CD4055BE to support repair, maintenance, and long-lifecycle industrial programs where redesign is impractical or certified.

Can the CD4055BE operate from a 3.3V supply?

Yes, the CD4055BE supports a minimum supply voltage of 3V as specified in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the SCHS048C datasheet. At 3.3V, its output drive capability is reduced compared to 5V or 12V operation, but logic thresholds and latch functionality remain valid. System-level validation is required for LED brightness and timing margins when operating at the lower end of the 3V–18V range.