Texas Instruments CD74HC4511PWT

Overview

CD74HC4511PWT from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder/driver IC in 16-pin TSSOP package, operating from 2 V to 6 V. It features input latching, active-low blanking (BL), lamp-test (LT), and latch-enable (LE) control. Designed for direct LED segment driving with 10 mA sourcing capability at 6 V, it enables stable numeric display in instrumentation and industrial panel interfaces.

For engineers reviewing the CD74HC4511PWT datasheet, CD74HC4511PWT pinout, CD74HC4511PWT application, or CD74HC4511PWT equivalent, key selection criteria include its 2–6 V supply range, latch-enabled BCD storage, high-current segment drive, and compatibility with common anode 7-segment displays - all critical for embedded display subsystem design and legacy TTL replacement.

Technical Context

The CD74HC4511PWT implements a synchronous latch/decoder architecture: when LE is high, D0–D3 inputs are stored; when LE is low, outputs follow inputs transparently. Its output stage uses standard-size CMOS transistors optimized for sourcing current into common-anode LED segments, not sinking.

It supports two distinct functional modes via BL (blanking) and LT (lamp test): BL = L forces all segment outputs high (blanking), while LT = L overrides decoding to drive all segments simultaneously - enabling hardware-level display diagnostics without microcontroller intervention.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant, moisture sensitivity level 1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC4511PWT, CD74HC4511PWR offers identical performance with active production status and volume availability, while SN74LS47N lacks latching, lamp test, and wide-voltage operation - making it functionally incomplete for modern embedded display subsystems.

Availability

CD74HC4511PWT is available at Aetrix Electronics and suitable for industrial panel meters, test equipment displays, and legacy system upgrades requiring stable component supply and long-term obsolescence mitigation support.

Supply support for CD74HC4511PWT 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 specializing in analog, embedded processing, and logic ICs, with over 90 years of innovation in industrial, automotive, and consumer electronics.

The CD74HC4511PWT belongs to TI's HC-series high-speed CMOS logic family, designed specifically for low-power, noise-immune digital display interfaces in harsh industrial environments - replacing legacy TTL with enhanced voltage flexibility and integrated diagnostics.

FAQ

What is the supply voltage range supported by the CD74HC4511PWT?

The CD74HC4511PWT operates from 2 V to 6 V DC. This wide range allows direct integration into both 3.3 V and 5 V systems without level-shifting, and supports battery-backed or variable-input industrial power supplies. Operation outside this range risks permanent damage per absolute maximum ratings.

Can the CD74HC4511PWT drive common-cathode 7-segment displays?

No, the CD74HC4511PWT is designed exclusively for common-anode displays: its outputs source current (a–g = H to illuminate). Driving common-cathode displays would require external inverters or PNP transistors, negating its integrated advantage. Use SN74LS47 or similar sinking drivers for common-cathode configurations.

How does the lamp test (LT) function work on the CD74HC4511PWT?

When LT is pulled low, the CD74HC4511PWT overrides normal BCD decoding and forces all segment outputs (a–g) high simultaneously - illuminating every segment regardless of D0–D3 state. This enables rapid hardware-level display continuity checks during manufacturing or field service without MCU involvement.

Is the CD74HC4511PWT pin-compatible with the CD74HC4511PWR?

Yes, CD74HC4511PWT and CD74HC4511PWR share identical TSSOP-16 pinout, electrical specifications, and functional behavior. The only difference is packaging format and lifecycle status: PWT is obsolete, while PWR is active and supplied in tape-and-reel - making PWR the recommended replacement for new designs.

What happens when an invalid BCD code (10–15) is applied to the CD74HC4511PWT?

When D3–D0 represent a value greater than 9 (i.e., 1010 to 1111), the CD74HC4511PWT blanks all segment outputs (a–g = H), resulting in no visible digit. This behavior is hardwired in the decode logic and occurs regardless of LE, BL, or LT state - ensuring safe default behavior for erroneous inputs.