Texas Instruments CD74HC4511PWRE4

Overview

CD74HC4511PWRE4 from Texas Instruments is a BCD-to-7-segment latch/decoder/driver IC in 16-pin TSSOP package, operating from 2 V to 6 V. It features input latching for BCD code storage, active-low blanking (BL), lamp-test (LT), and latch-enable (LE) control. Designed for driving common-anode 7-segment LED displays, it delivers 10 mA sourcing capability at 6 V with balanced propagation delays.

For engineers reviewing the CD74HC4511PWRE4 datasheet, CD74HC4511PWRE4 pinout, CD74HC4511PWRE4 application, or CD74HC4511PWRE4 equivalent, key selection considerations include its 2–6 V supply range, latch-enabled BCD decoding, lamp-test functionality, and TSSOP-16 thermal performance (RθJA = 108 °C/W).

Technical Context

The CD74HC4511PWRE4 implements a synchronous latch/decoder architecture: when LE is high, D0–D3 inputs are latched; when LE is low, outputs follow inputs transparently. Its output stage is optimized for sourcing current into common-anode LED segments, with VOH ≥ 5.48 V at IOH = −5.2 mA and VCC = 6 V.

It supports full BCD decoding (0–9), blanks illegal codes (>9), and provides dedicated LT and BL controls - LT forces all segment outputs high (full display illumination), while BL forces all outputs low (blanking). Timing parameters are specified across −55°C to 125°C, with tpd ≤ 64 ns (VCC = 6 V, CL = 50 pF).

Key Specifications

Pinout & Package

Packaged in a 16-pin TSSOP (PW) with 5.00 mm × 4.40 mm body size and 0.65 mm lead pitch, the CD74HC4511PWRE4 uses a surface-mount footprint compatible with automated assembly and offers improved thermal resistance (RθJA = 108 °C/W) versus PDIP/SOIC variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC4511PWR, CD74HC4511PWRE4 offers identical performance but with enhanced manufacturing traceability; versus SN74LS47N, it delivers 4× higher output drive, 50% lower supply current, integrated latching, and true 2–6 V operation - making it superior for modern low-power, mixed-voltage, and feature-rich display interfaces.

Availability

CD74HC4511PWRE4 is available at Aetrix Electronics and suitable for industrial panel meters, appliance control displays, test equipment counters, and automotive dashboard indicators requiring stable component supply and long-term manufacturability.

Supply support for CD74HC4511PWRE4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and logic ICs.

The CD74HC4511PWRE4 belongs to TI's HC logic family - designed for low-power, high-noise-immunity digital interfacing in industrial, instrumentation, and consumer electronics where reliability and wide supply voltage tolerance are essential.

FAQ

What is the maximum supply voltage rating for CD74HC4511PWRE4?

The absolute maximum supply voltage (VCC) for CD74HC4511PWRE4 is 7 V, but the recommended operating range is 2 V to 6 V. Operation above 6 V risks exceeding safe junction temperature and may cause permanent damage. The CD74HC4511PWRE4 achieves optimal sourcing performance (10 mA) and timing (tpd ≤ 64 ns) at 6 V, making it ideal for 5 V and 3.3 V systems with headroom.

Does CD74HC4511PWRE4 support common-cathode LED displays?

No, CD74HC4511PWRE4 is designed exclusively for common-anode 7-segment LED displays - its a–g outputs are active-high and source current. Driving common-cathode displays would require external inverters or PNP transistors, which add complexity and reduce efficiency. For common-cathode applications, consider alternatives like the CD74HCT4543 or discrete driver solutions.

How does the lamp test (LT) function operate in CD74HC4511PWRE4?

When the LT pin is pulled low (active), CD74HC4511PWRE4 forces all segment outputs (a–g) high regardless of BCD input or latch state - illuminating all segments simultaneously. This enables rapid visual verification of LED connections and display integrity without MCU firmware involvement. LT operates independently of BL and LE, allowing test mode even during blanked or latched states.

Can CD74HC4511PWRE4 be used without external current-limiting resistors?

No - external current-limiting resistors are mandatory on each segment output (a–g) of CD74HC4511PWRE4. Although it sources up to 10 mA per output, LED forward voltage variation and temperature drift can cause excessive current without series resistance. Typical design uses 220 Ω to 1 kΩ resistors (depending on VCC and LED VF) to limit current to 5–8 mA for reliable brightness and longevity.

What is the thermal resistance (RθJA) of CD74HC4511PWRE4, and how does it impact layout?

The CD74HC4511PWRE4 has RθJA = 108 °C/W in its TSSOP-16 (PW) package. This means junction temperature rises 108°C above ambient per watt of dissipated power. To maintain safe operation (<125°C TJ), keep total power below ~150 mW under typical conditions. Layout best practices include using a 0.1 μF ceramic bypass capacitor near VCC/GND pins and avoiding copper pours under the package unless thermally anchored to internal ground planes.