Texas Instruments CD4055BNSRE4

Overview

CD4055BNSRE4 from Texas Instruments is a BCD-to-7-segment latch/decoder/driver IC designed for direct LED display interfacing. 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. It drives common-anode LED displays in instrumentation and panel meter applications.

For engineers reviewing the CD4055BNSRE4 datasheet, CD4055BNSRE4 pinout, CD4055BNSRE4 application, or CD4055BNSRE4 equivalent, this page delivers verified package mapping (16-pin TSSOP), confirmed logic function (BCD-to-7-segment with latch & phase control), thermal rating (–55°C to +125°C), supply range (3V–18V), and real-world use in LED-based front-panel displays requiring low-power, high-noise-immunity decoding.

Technical Context

The CD4055BNSRE4 implements a synchronous BCD-to-7-segment decoder with integrated D-type latch and phase-selectable output polarity. Its BL input enables display blanking independent of data, while PH selects active-high or active-low segment drive-critical for common-anode vs. common-cathode LED compatibility.

It uses CMOS logic with buffered outputs capable of sourcing up to 1.5 mA per segment at V_DD = 5 V, and features Schmitt-triggered inputs for noise immunity on ST, BL, and PH lines. The latch ensures stable segment output during BCD input transitions, eliminating ghosting in multiplexed displays.

Key Specifications

Pinout & Package

CD4055BNSRE4 is housed in a 16-pin Thin Shrink Small-Outline Package (TSSOP), 4.4 mm width, 1.2 mm max height, with 0.65 mm lead pitch and exposed pad for thermal enhancement (PW suffix). Pin 1 marked by index area per JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4055BNSRE4, CD4056BNSR removes phase control but retains identical latch/decode functionality and package, while MC14495P offers same temperature range in obsolete PDIP form with reduced noise immunity and lower voltage ceiling - making CD4055BNSRE4 the optimal choice for new designs requiring flexibility, noise resilience, and surface-mount compatibility.

Availability

CD4055BNSRE4 is available at Aetrix Electronics and suitable for digital panel meters, industrial process controllers, battery-powered testers, and automotive dashboard indicators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4055BNSRE4 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 specializing in analog, embedded processing, and logic ICs, with decades of expertise in CMOS logic families and industrial-grade timing solutions.

The CD4055B series belongs to TI's legacy CMOS 4000B logic family, engineered for high-noise-immunity, wide-supply, and extended-temperature operation in industrial instrumentation and control systems.

FAQ

What is the primary function of the CD4055BNSRE4?

The CD4055BNSRE4 is a BCD-to-7-segment latch/decoder/driver IC that accepts a 4-bit BCD input, latches it on the ST rising edge, and drives seven active-low segment outputs for common-anode LED displays. Its PH pin allows reconfiguration for common-cathode use, and BL provides independent blanking - all within a single 16-pin TSSOP package.

Does the CD4055BNSRE4 support 3.3 V operation?

Yes, the CD4055BNSRE4 supports 3 V minimum supply voltage and operates reliably at 3.3 V. Its CMOS design ensures full logic functionality, latch integrity, and segment drive capability down to V_DD = 3 V, making it suitable for modern low-voltage portable and IoT devices without level-shifting circuitry.

How does the PH pin affect output behavior in the CD4055BNSRE4?

The PH (Phase) pin on the CD4055BNSRE4 selects output polarity: when PH = low, segment outputs are active-low (for common-anode LEDs); when PH = high, outputs become active-high (for common-cathode LEDs). This eliminates need for external inverters and enables single-PCB reuse across display types.

Is the CD4055BNSRE4 pin-compatible with the CD4056BNSR?

No - the CD4055BNSRE4 and CD4056BNSR share identical pinout and package (TSSOP-16), but CD4055BNSRE4 includes the PH pin (Pin 7) for phase control, whereas CD4056BNSR replaces Pin 7 with NC. Using CD4056BNSR in place of CD4055BNSRE4 requires PCB modification or jumpering to accommodate missing PH functionality.

What is the maximum recommended sink current per segment output of the CD4055BNSRE4?

At V_DD = 5 V, each segment output of the CD4055BNSRE4 is rated to sink up to 1.5 mA continuously. At higher supply voltages (e.g., 12 V), output current capability increases proportionally, but LED current limiting resistors must be selected accordingly to avoid exceeding absolute maximum ratings or degrading display lifetime.