Texas Instruments CD4511BNSRG4

Overview

CD4511BNSRG4 from Texas Instruments is a BCD-to-7-segment latch/decoder/driver IC designed for direct LED display control. It features active-high Latch Enable (LE), active-low Blanking (BL), and Lamp Test (LT) 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 and industrial counter displays.

For engineers reviewing the CD4511BNSRG4 datasheet, CD4511BNSRG4 pinout, CD4511BNSRG4 application, or CD4511BNSRG4 equivalent, key selection criteria include latch timing compatibility with upstream BCD sources, BL/LT logic polarity matching, common-cathode drive capability, and SOP-16 thermal and layout constraints in space-constrained instrumentation designs.

Technical Context

The CD4511BNSRG4 implements a CMOS BCD-to-7-segment decoder with integrated latching and display control logic. Its LE input captures and holds BCD data on the rising edge, while BL forces all segment outputs low and LT overrides BL to test all segments simultaneously.

It drives common-cathode LED displays directly without external current-limiting resistors per segment, using internal current regulation. The device uses standard 4000-series CMOS logic levels and exhibits rail-to-rail output swing compatible with V_DD = 3 V to 18 V operation.

Key Specifications

Pinout & Package

CD4511BNSRG4 is housed in a 16-pin Small Outline Package (SOP-NS), 10.4 mm × 5.4 mm body size, 1.27 mm lead pitch, 2.00 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4511BNSRG4, CD4543BNSR requires redesign of display interconnect and current-limiting network, whereas MC14511BDWR2G offers seamless second-source substitution with identical SOP-16 footprint, timing, and drive characteristics.

Availability

CD4511BNSRG4 is available at Aetrix Electronics and suitable for digital panel meters, industrial counters, PLC HMIs, and test equipment status indicators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4511BNSRG4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial and automotive qualification.

The CD4511BNSRG4 belongs to TI's 4000-series CMOS logic family, developed for robust, low-power digital interface and display-driving functions in harsh-environment instrumentation and control systems.

FAQ

What is the logic polarity of the Blanking (BL) input on the CD4511BNSRG4?

The Blanking (BL) input on the CD4511BNSRG4 is active-low: when pulled low, it forces all segment outputs (a–g) to logic low, turning off the connected common-cathode LED display regardless of latch content or Lamp Test state. This allows hardware-level display suppression without altering stored BCD data. The CD4511BNSRG4 datasheet confirms BL is referenced to V_SS and asserts blanking at V_IL ≤ 0.5 V_DD.

Can the CD4511BNSRG4 drive common-anode LED displays?

No, the CD4511BNSRG4 cannot directly drive common-anode LED displays. Its segment outputs (pins 9–15) are active-high and designed to source current into the anodes of common-cathode LEDs. Driving a common-anode display would require external inverters or PNP transistor buffers, which defeats the purpose of its integrated drive architecture. For common-anode use, the CD4543BNSR is the functionally matched alternative.

What is the maximum supply voltage rating for the CD4511BNSRG4?

The CD4511BNSRG4 has a maximum supply voltage rating of 18 V, with guaranteed operation from 3 V to 18 V across the full –55°C to +125°C temperature range. This wide range allows direct use with 5 V logic systems, 12 V industrial rails, or battery-powered instruments without regulators. Exceeding 18 V risks permanent damage to the CMOS structure, as specified in the absolute maximum ratings table of the CD4511BNSRG4 datasheet.

Does the CD4511BNSRG4 require external current-limiting resistors for LED segments?

No, the CD4511BNSRG4 does not require external current-limiting resistors for standard 7-segment LED displays. It incorporates internal current-limiting circuitry that regulates segment output current based on V_DD, enabling direct connection to common-cathode LEDs. However, peak segment current remains dependent on V_DD and LED forward voltage; design validation with actual display modules is recommended per the CD4511BNSRG4 application notes.

How does the Latch Enable (LE) input function on the CD4511BNSRG4?

The Latch Enable (LE) input on the CD4511BNSRG4 is edge-triggered: a rising transition captures the present BCD input (A–D) and stores it in the internal latch register. Subsequent changes to A–D do not affect the decoded output until the next LE rising edge. This allows asynchronous BCD updates while maintaining stable display output - a key feature confirmed in the CD4511BNSRG4 functional description and timing diagrams.