Texas Instruments CD4511BPW

Overview

CD4511BPW from Texas Instruments is a BCD-to-7-segment latch/decoder/driver IC designed for direct LED display control. It features active-low Lamp Test (LT), Blanking (BL), and Latch Enable (LE) inputs, operates over –55°C to +125°C, supports common-cathode displays, and integrates internal segment current limiting. It is used in digital panel meters, industrial counters, and test equipment displays.

For engineers reviewing the CD4511BPW datasheet, CD4511BPW pinout, CD4511BPW application, or CD4511BPW equivalent, key selection considerations include its TSSOP-16 package compatibility with high-density PCB layouts, latch functionality for static BCD code storage, and direct drive capability for common-cathode 7-segment LEDs without external transistors.

Technical Context

The CD4511BPW implements CMOS logic with BCD input decoding (A–D), latching via LE, and active-low output drivers optimized for common-cathode LED segments (a–g). Its LT and BL inputs enable real-time display diagnostics and intensity modulation without interrupting latched data.

It shares functional equivalence with MC14511 but uses TI's proprietary CMOS process, delivering rail-to-rail output swing, low quiescent current (<10 µA at V_DD = 5 V), and noise immunity up to 45% of V_DD, making it suitable for noisy industrial environments.

Key Specifications

Pinout & Package

CD4511BPW is housed in a 16-pin Thin Shrink Small-Outline Package (TSSOP-PW), 4.9 mm × 3.0 mm footprint, 1.2 mm max height, with 0.65 mm lead pitch and exposed pad not present. Pin 1 is located at the top-left corner with index marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4511BPW, CD4511BPWRG4 offers identical electrical performance with assured supply chain continuity, while MC14511BDR2G provides a second-source option with slightly reduced voltage headroom - both require no PCB changes but differ in lifecycle and voltage margin.

Availability

CD4511BPW is available at Aetrix Electronics and suitable for digital panel meters, industrial counters, and test equipment requiring stable component supply - though it is marked obsolete by Texas Instruments and subject to limited remaining stock.

Supply support for CD4511BPW 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, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and consumer markets.

The CD4511B family was developed as part of TI's legacy CMOS logic portfolio to provide robust, wide-supply-range display interface solutions for ruggedized instrumentation and control panels.

FAQ

What is the supply voltage range supported by the CD4511BPW?

The CD4511BPW supports a supply voltage range of 3 V to 18 V. This wide range allows it to operate reliably in both modern low-voltage systems (e.g., 3.3 V microcontroller interfaces) and legacy industrial equipment powered by 12 V or 15 V rails. The CD4511BPW maintains full logic functionality and segment drive capability across this entire span without derating.

Is the CD4511BPW pin-compatible with the MC14511?

Yes, the CD4511BPW is functionally and pin-compatible with the MC14511. Both devices share identical pin assignments, BCD input mapping, active-low control signals (LT, BL, LE), and common-cathode segment outputs (a–g). However, the CD4511BPW is specified up to 18 V, whereas the MC14511 typically maxes out at 15 V - verify voltage requirements before substitution.

What does the 'PW' suffix indicate in CD4511BPW?

The 'PW' suffix in CD4511BPW denotes Texas Instruments' Thin Shrink Small-Outline Package (TSSOP) with 16 leads. This surface-mount package measures 4.9 mm × 3.0 mm with 0.65 mm lead pitch and 1.2 mm max height, enabling high-density PCB layouts. The CD4511BPW uses the PW0016A package drawing per TI documentation.

Can the CD4511BPW drive common-anode LED displays?

No, the CD4511BPW is designed exclusively for common-cathode 7-segment LED displays. Its outputs are active-low and sink current - they cannot source current to drive common-anode configurations. Attempting to use it with common-anode displays will result in non-functional or inverted segment behavior. For common-anode applications, consider dedicated common-anode drivers like the SN74LS47.

Why is the CD4511BPW marked as obsolete, and what is the recommended replacement?

The CD4511BPW is marked obsolete by Texas Instruments due to end-of-life packaging and inventory rationalization. The recommended replacement is CD4511BPWRG4 - same silicon, RoHS-compliant, tape-and-reel packaged (2000 pcs), and actively produced. CD4511BPWRG4 retains identical electrical specs, pinout, and thermal ratings, ensuring seamless transition for existing CD4511BPW designs.