Texas Instruments CD74HC4511MT

Overview

CD74HC4511MT from Texas Instruments is a BCD-to-7-segment latch/decoder/driver IC designed for direct LED digit driving in digital displays. It features 4-bit BCD input (D0–D3), active-low blanking (BL), lamp-test (LT), and latch-enable (LE) control, operates from 2 V to 6 V, sources up to 10 mA per segment at 6 V, and supports latch-transparent operation. It is used in multiplexed 7-segment display systems requiring stable digit decoding with built-in blanking and test functions.

For engineers reviewing the CD74HC4511MT datasheet, CD74HC4511MT pinout, CD74HC4511MT application, or CD74HC4511MT equivalent, this page delivers verified electrical characteristics, functional mode behavior, package-specific thermal data, latch timing constraints (tsu/th/tW), and real-world design implications of its high-output sourcing capability and CMOS-level noise immunity.

Technical Context

The CD74HC4511MT implements a synchronous latch/decoder architecture where LE controls storage of BCD inputs into internal latches; when LE is low, outputs follow BCD inputs transparently. Its output stage uses standard-size CMOS transistors optimized for segment sourcing - not sinking - with VOH ≥ 5.9 V and VOL ≤ 0.26 V at 6 V/5.2 mA.

It integrates three key functional modes: blanking (BL active-low forces all segment outputs high), lamp test (LT active-low drives all segments low for full-digit illumination), and latched decode (LE high stores BCD code and decodes it to active-high segment outputs a–g). Input thresholds meet HC logic levels: VIH = 4.2 V, VIL = 1.8 V at VCC = 6 V.

Key Specifications

Pinout & Package

CD74HC4511MT is supplied in a 16-pin SOIC (D) package with nominal body size 9.90 mm × 3.90 mm and 1.27 mm lead pitch. Thermal resistance RθJA = 67 °C/W enables operation up to 125°C ambient with moderate PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC4511MT, CD74HCT4511E offers better compatibility with 5 V TTL but sacrifices supply flexibility and noise margin, while SN74LS47N provides legacy LSTTL sink-driving but increases component count and power draw - making CD74HC4511MT optimal for new 3.3/5 V CMOS-based display subsystems.

Availability

CD74HC4511MT is available at Aetrix Electronics and suitable for industrial panel meters, test equipment displays, embedded HVAC controllers, and medical device status panels requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC4511MT 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The CD74HC4511MT belongs to TI's 74HC logic family, engineered for low-power, high-noise-immunity digital interfacing in display, instrumentation, and control applications where reliability and wide supply voltage tolerance are essential.

FAQ

What is the maximum output current per segment for CD74HC4511MT?

The CD74HC4511MT can source up to 10 mA per segment output (pins a–g) at VCC = 6 V, with VOH ≥ 5.48 V and VOL ≤ 0.26 V under that load. This rating is confirmed in Section 5.5 of the TI datasheet (SCHS279E) and supports direct driving of low-current LED segments without external transistors. Exceeding 10 mA risks violating absolute maximum ratings and degrading long-term reliability of CD74HC4511MT.

Does CD74HC4511MT support common-cathode LED displays?

No, CD74HC4511MT is designed exclusively for common-anode LED displays. Its segment outputs (a–g) are active-high and source current - they drive the anode side of LEDs, requiring cathodes tied to ground. Using CD74HC4511MT with common-cathode displays would require external inverters or PNP drivers, which defeats its integrated driver advantage and is not supported by the device's functional architecture or datasheet specifications.

How does the latch-enable (LE) pin affect timing in CD74HC4511MT?

The LE pin controls latch transparency: when LE is high, CD74HC4511MT stores the current BCD inputs (D0–D3) and holds decoded outputs stable; when LE is low, outputs follow BCD inputs in real time. Timing requires tsu = 13 ns minimum setup before LE rising edge and th = 3 ns minimum hold after, per Section 5.7 of the datasheet. Violating these windows causes metastability or incorrect latched values in CD74HC4511MT operation.

Can CD74HC4511MT operate at 3.3 V supply voltage?

Yes, CD74HC4511MT is fully specified for operation from 2 V to 6 V, including 3.3 V. At VCC = 3.3 V, VIH = 2.31 V and VIL = 0.99 V (30% noise margin), IOH = ~5.5 mA typical, and tpd ≈ 100 ns - all within guaranteed limits. This makes CD74HC4511MT compatible with modern 3.3 V microcontrollers without level translation, unlike CD74HCT4511E which requires 4.5–5.5 V.

What is the purpose of the BI/RBO pin on CD74HC4511MT?

The BI/RBO pin serves dual functions: as BI (Blanking Input), it is active-low and forces all segment outputs high to blank the digit; as RBO (Ripple Blanking Output), it goes low when the decoded BCD value is zero, enabling cascaded blanking of leading zeros in multi-digit displays. This dual-role pin simplifies zero-suppression logic in CD74HC4511MT-based systems without external gates or firmware overhead.