Texas Instruments CD74HC4511PW

Overview

CD74HC4511PW from Texas Instruments is a BCD-to-7-segment latch/decoder/driver IC in TSSOP-16 package, operating from 2 V to 6 V. It features input latching, lamp-test and blanking inputs, and high-output sourcing capability (10 mA at 6 V). It drives common-cathode LED displays in digital instrumentation and panel meters.

For engineers reviewing the CD74HC4511PW datasheet, CD74HC4511PW pinout, CD74HC4511PW application, or CD74HC4511PW equivalent, key selection criteria include its latch-enable timing (14 ns min pulse width), BCD storage function, 7-segment output drive strength, and compatibility with 5 V TTL logic systems via HCT variants.

Technical Context

The CD74HC4511PW implements a synchronous latch-decoder-driver architecture: four BCD inputs (D0–D3) are stored on the rising edge of LE, then decoded into active-high 7-segment outputs (a–g). Its internal latches isolate input changes from display updates, enabling stable digit rendering during multiplexed scanning.

It supports two distinct operational modes: blanking (BL low forces all outputs low) and lamp test (LT low forces all segments high). Propagation delays are balanced across segments (e.g., 51 ns max from Dn to output at 6 V, CL = 50 pF), ensuring uniform digit illumination timing.

Key Specifications

Pinout & Package

TSSOP-16 package (PW), 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm lead pitch, 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 driver applications.

Compared with CD74HCT4511PW and SN74LS47N, CD74HC4511PW offers wider voltage operation (2–6 V), lower static power, integrated latching, and diagnostic features-making it optimal for modern low-power, flexible-supply embedded displays.

Availability

CD74HC4511PW is available at Aetrix Electronics and suitable for digital instrumentation, industrial process controllers, and medical device displays requiring stable component supply and long-term manufacturability.

Supply support for CD74HC4511PW 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 founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial and automotive qualification.

The CD74HC4511PW belongs to TI's HC logic family, designed for low-power, high-noise-immunity digital interface applications in measurement, control, and display systems where reliability and supply flexibility are critical.

FAQ

What is the maximum supply voltage rating for CD74HC4511PW?

The absolute maximum supply voltage for CD74HC4511PW is 7 V, but the recommended operating range is 2 V to 6 V. Operating continuously above 6 V risks exceeding absolute maximum ratings and may cause permanent damage. The CD74HC4511PW delivers optimal performance-including 10 mA output drive and balanced propagation delays-within the 2–6 V window specified in the datasheet.

Does CD74HC4511PW support common-anode LED displays?

No, CD74HC4511PW is designed exclusively for common-cathode LED displays, with active-high 7-segment outputs (a–g). Its outputs source current to LED anodes while cathodes connect to ground. To drive common-anode displays-which require active-low sinking outputs-a different device such as the CD74HC4543 (latch/decoder for common-anode) or external inverters would be required. The CD74HC4511PW datasheet explicitly specifies common-cathode operation in its functional description and output behavior.

How does the latch-enable (LE) input affect timing in CD74HC4511PW?

The LE input controls synchronous latching: when LE transitions high, the current BCD inputs (D0–D3) are captured and held, making outputs independent of further input changes until LE goes low again. Minimum LE pulse width is 14 ns at 6 V. This allows CD74HC4511PW to freeze digit values during multiplexed display scanning, preventing ghosting or partial updates. The LE timing parameters (setup/hold times) are fully characterized in the datasheet for robust integration with microcontrollers or FPGAs.

Can CD74HC4511PW drive multiple digits in a multiplexed configuration?

Yes, CD74HC4511PW is commonly used in multiplexed LED displays. Its latch function holds one digit's BCD value while the microcontroller selects digit position via external digit drivers (e.g., NPN transistors or shift registers). The CD74HC4511PW's fast propagation delay (51 ns max) and consistent timing across all seven outputs ensure uniform brightness and eliminate cross-talk between digits. For 4-digit systems, one CD74HC4511PW per digit is typical, with shared BCD bus and individual LE/BL control lines.

What is the purpose of the BL (blanking) and LT (lamp test) pins on CD74HC4511PW?

The BL (blanking) pin is active-low and forces all seven segment outputs low, suppressing display output-useful during digit switching or fault conditions. The LT (lamp test) pin is also active-low and forces all outputs high, illuminating every LED segment simultaneously to verify wiring and LED integrity. Both functions operate independently of the latch state and BCD inputs. These dedicated control pins simplify system-level diagnostics and visual feedback in the CD74HC4511PW, eliminating need for software-driven test patterns or additional GPIO resources.