Texas Instruments CD4055BM96G4

Overview

CD4055BM96G4 from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder/driver IC designed for direct LED display interfacing. It accepts 4-bit BCD input, latches data, decodes to seven-segment outputs (a–g), and drives common-cathode LED displays with sink-current capability up to 10 mA per segment at V_DD = 15 V. It operates across –55°C to +125°C and features TTL-compatible inputs.

For engineers reviewing the CD4055BM96G4 datasheet, CD4055BM96G4 pinout, CD4055BM96G4 application, or CD4055BM96G4 equivalent, key selection considerations include its BCD latching behavior, common-cathode output polarity, segment current drive limits, wide temperature range, and SOIC-16 packaging for space-constrained industrial displays.

Technical Context

The CD4055B-series implements synchronous latching: data is captured on the rising edge of the LATCH ENABLE (LE) signal, then decoded and held on the seven-segment outputs independent of subsequent input changes. Its internal logic includes active-low LE control and built-in segment blanking via the BLANK input.

Unlike the CD4054B (common-anode driver) and CD4056B (common-cathode with ripple-blank input), the CD4055B lacks ripple blanking but provides dedicated BLANK and LATCH ENABLE pins for precise display update timing in multiplexed systems. All three share identical BCD input decoding tables and supply voltage range (3 V to 18 V).

Key Specifications

Pinout & Package

CD4055BM96G4 is housed in a 16-pin SOIC (D) package, 3.9 mm wide, 9.9 mm long, 1.75 mm max height, with 0.65 mm lead pitch and RoHS-compliant NiPdAu finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4056BM96 and SN74LS47N, the CD4055BM96G4 uniquely combines latching, blanking, and wide-voltage common-cathode drive - making it the only choice for robust, multiplexed LED displays in industrial or automotive settings requiring timing control and supply flexibility.

Availability

CD4055BM96G4 is available at Aetrix Electronics and suitable for industrial panel meters, appliance control displays, and automotive instrument clusters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4055BM96G4 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 solutions, with decades of heritage in CMOS logic and industrial-grade ICs.

The CD4055B series belongs to TI's legacy CMOS 4000B logic family, engineered for high-noise-immunity, low-power, wide-supply-operation digital interface functions in harsh environments.

FAQ

What is the function of the TEST pin (Pin 16) on the CD4055BM96G4?

The TEST pin on the CD4055BM96G4 is an internal wafer-probe and production test node with no functional role in normal operation. It is not bonded to the die in final packaged devices and must be left unconnected. Connecting or biasing Pin 16 may cause undefined behavior or damage; TI documentation explicitly states it is reserved for factory testing only.

Does the CD4055BM96G4 support multiplexed LED displays?

Yes, the CD4055BM96G4 supports multiplexed LED displays through its dedicated BLANK (Pin 5) and LATCH ENABLE (Pin 6) inputs. BLANK can be synchronized with digit-select signals to extinguish all segments during digit switching, while LE ensures only valid BCD data is latched and displayed - eliminating cross-talk and ghosting in multi-digit systems.

Can the CD4055BM96G4 drive common-anode LED displays?

No, the CD4055BM96G4 is designed exclusively for common-cathode LED displays. Its segment outputs (a–g) are active-low sink drivers. Driving common-anode displays would require external inverters or PNP transistor buffers, which defeat the IC's integration advantage and increase board area and cost. Use CD4054B or CD4056B for common-anode applications.

What is the maximum segment current the CD4055BM96G4 can deliver per output?

The CD4055BM96G4 delivers up to 10 mA sink current per segment (a–g) when V_DD = 15 V and V_SS = 0 V, with output voltage drop ≤0.5 V. At lower supply voltages (e.g., 5 V), the available current decreases due to reduced headroom; design margin should account for worst-case V_OL and LED forward voltage.

Is the CD4055BM96G4 pin-compatible with the CD4055BE (PDIP-16) version?

Yes, the CD4055BM96G4 (SOIC-16) shares identical pin numbering, signal assignment, and electrical functionality with the CD4055BE (PDIP-16). Both use the same 16-pin dual-in-line footprint pattern - enabling drop-in replacement on adapter boards or redesigns where SOIC density or reflow compatibility is required.