Texas Instruments CD4054BM

Overview

CD4054BM from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder driver IC designed to directly interface microcontroller outputs to common-anode LED displays. It features 4-bit BCD input, active-high latch enable, open-drain segment outputs capable of sinking ≥10 mA per segment, and operates across -55°C to +125°C. It is used in industrial panel meters and legacy instrumentation requiring direct LED drive without external current-limiting resistors.

For engineers reviewing the CD4054BM datasheet, CD4054BM pinout, CD4054BM application, or CD4054BM equivalent, key selection considerations include its open-drain output architecture, latch-controlled data hold, common-anode LED compatibility, and SOIC-16 packaging for space-constrained PCB layouts.

Technical Context

The CD4054BM implements a synchronous latch followed by a BCD-to-7-segment decoding logic block with active-low segment outputs (a–g) and decimal point (DP). Its latch enables stable display updates during bus contention or slow microcontroller writes.

All outputs are open-drain N-channel MOSFETs rated for 10 mA sink current at V_DD = 15 V, supporting direct connection to common-anode LEDs with external anode pull-up. No internal current limiting or segment blanking logic is included.

Key Specifications

Pinout & Package

CD4054BM is supplied in a 16-pin SOIC (D) package, 3.9 mm body width, 1.2 mm max height, with 0.65 mm lead pitch and RoHS-compliant NiPdAu lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4054BM, CD4511BE adds diagnostic features but lacks native common-anode compatibility, while MC14495P delivers greater drive strength at the cost of larger board area and obsolete status - CD4054BM remains optimal for compact SOIC-based common-anode designs requiring latch stability and wide voltage support.

Availability

CD4054BM is available at Aetrix Electronics and suitable for industrial panel meters, legacy test equipment displays, and automotive instrument clusters requiring stable component supply and long-term obsolescence management.

Supply support for CD4054BM 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.

The CD4054BM belongs to TI's legacy CMOS logic portfolio, specifically engineered for direct LED display interfacing in resource-constrained, high-reliability instrumentation where latch integrity and wide supply tolerance are critical.

FAQ

What is the maximum sink current per segment output on the CD4054BM?

The CD4054BM segment outputs (pins 6–12 and 13) are open-drain N-channel MOSFETs rated for ≥10 mA sink current each at V_DD = 15 V and 25°C. This rating ensures reliable drive of standard 20-mA LEDs at reduced brightness or high-efficiency LEDs at full brightness without external buffers. Derating applies above 70°C ambient per TI's thermal guidelines in the SCHS048C datasheet.

Does the CD4054BM support common-cathode LED displays?

No, the CD4054BM does not natively support common-cathode LED displays. Its segment outputs are open-drain and designed for connection to the cathodes of common-anode LEDs, with anode terminals tied to a positive supply. To drive common-cathode displays, external PNP transistors or level-shifting circuitry would be required - making CD4511BE a more appropriate choice for that topology.

Is the NC pin (pin 16) on the CD4054BM required to be grounded or left floating?

Pin 16 on the CD4054BM is designated NC (No Connect) and must remain unconnected - neither grounded nor tied to V_DD. TI's SCHS048C datasheet explicitly states this pin has no internal connection and routing traces or solder joints to it may cause unpredictable behavior or reliability issues due to parasitic coupling.

Can the CD4054BM operate from a 3.3-V supply?

Yes, the CD4054BM is fully specified to operate from 3 V to 18 V, including 3.3 V nominal supplies. At 3.3 V, its segment outputs maintain ≥2 mA sink capability - sufficient to drive low-current indicator LEDs or high-efficiency green/red LEDs. Logic thresholds scale with V_DD, ensuring compatibility with 3.3-V microcontrollers without level shifting.

What is the purpose of the latch enable (LE) input on the CD4054BM?

The latch enable (LE) input on the CD4054BM controls data capture timing: when LE is high, the current BCD input (A–D) is latched and decoded to the segment outputs; when LE is low, the outputs retain their last latched state regardless of input changes. This prevents display glitches during partial BCD updates or bus contention, making CD4054BM ideal for systems with shared or asynchronous data buses.