Texas Instruments CD74HC154EG4

Overview

CD74HC154EG4 from Texas Instruments is a high-speed CMOS 4-to-16 line decoder/demultiplexer with dual enable inputs (E1, E2), operating from 2V to 6V, supporting -55°C to +125°C industrial/military temperature range, featuring 30ns typical propagation delay at 4.5V and 50pF load, and used in address decoding for memory expansion and I/O port selection in embedded control systems.

For engineers reviewing the CD74HC154EG4 datasheet, CD74HC154EG4 pinout, CD74HC154EG4 application, or CD74HC154EG4 equivalent, key selection considerations include its dual-enable demux capability, wide VCC range, guaranteed operation across extreme temperatures, and compatibility with both LSTTL and CMOS logic families via HC-level input thresholds.

Technical Context

The CD74HC154EG4 implements combinational logic decoding using four binary address inputs (A0–A3) to assert exactly one of sixteen active-low outputs (Y0–Y15), with output state determined by the logical AND of both enables: outputs go high when either E1 or E2 is high, and only one low output appears when both enables are low and a valid address is applied.

Its architecture supports cascading via enable chaining-e.g., using one CD74HC154EG4's output to drive E1/E2 of another-and facilitates demultiplexing by treating one enable as data input while holding the other low, enabling 1-to-16 signal routing without external gating.

Key Specifications

Pinout & Package

CD74HC154EG4 is supplied in a 24-pin plastic dual in-line package (PDIP) with 0.600-inch body width, standard through-hole mounting, and JEDEC MS-001 compliant footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-to-16 decoder/demultiplexer applications.

Compared with CD74HC154EG4, SN74HC154N offers identical performance with enhanced manufacturability and compliance, while CD74HCT154E trades voltage flexibility for guaranteed LSTTL input compatibility-making the former ideal for future-proofing and the latter for legacy 5V system integration.

Availability

CD74HC154EG4 is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, industrial control logic, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC154EG4 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 logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The CD74HC154EG4 belongs to TI's legacy high-speed CMOS logic family, designed specifically for robust address decoding and signal routing in harsh-environment systems where wide temperature operation and noise immunity are essential.

FAQ

What is the maximum clock frequency supported by CD74HC154EG4?

The CD74HC154EG4 is a combinational logic device-not a clocked sequential IC-so it has no defined clock frequency. Its speed is characterized by propagation delay: 35 ns maximum from address input to output at 4.5V and 50pF load. System-level maximum toggle rate depends on board layout, load capacitance, and supply stability, but practical operation exceeds 10 MHz in well-designed circuits. The CD74HC154EG4 datasheet specifies no minimum pulse width or setup/hold timing beyond DC input thresholds.

Can CD74HC154EG4 operate at 3.3V supply voltage?

Yes, CD74HC154EG4 is fully specified for operation from 2V to 6V, including 3.3V nominal supply. At VCC = 3.3V, input thresholds scale proportionally (VIH ≈ 2.1V min, VIL ≈ 0.99V max), providing ~30% noise margin. Output VOH remains ≥3.15V and VOL ≤0.1V under 25mA load, ensuring reliable interfacing with 3.3V logic families. All AC and DC parameters in the CD74HC154EG4 datasheet include 3.3V test conditions.

Is CD74HC154EG4 pin-compatible with CD74HCT154E?

Yes, CD74HC154EG4 and CD74HCT154E share identical 24-pin PDIP mechanical footprint and pin assignments-including A0–A3, E1/E2, Y0–Y15, VCC, and GND-but differ electrically: CD74HC154EG4 accepts 2V–6V supplies and CMOS-level inputs, while CD74HCT154E requires 4.5V–5.5V and accepts LSTTL input voltages. Swapping them requires verifying supply voltage and driving source compatibility; no PCB change is needed if those conditions align.

What does the "G4" suffix mean in CD74HC154EG4?

The "G4" suffix in CD74HC154EG4 indicates a green, lead-free, RoHS-compliant packaging variant per Texas Instruments' standardized suffix nomenclature. It denotes matte tin lead finish, halogen-free molding compound, and compliance with JEDEC J-STD-020 moisture sensitivity Level 1 (unlimited floor life at <30°C/60% RH). The base part CD74HC154E remains functionally identical; G4 reflects environmental and assembly process enhancements-not electrical or thermal specification changes.

Does CD74HC154EG4 support cascading with other decoders?

Yes, CD74HC154EG4 supports cascading via its dual enable inputs: one CD74HC154EG4's active-low output (e.g., Y0) can drive E1 or E2 of a second CD74HC154EG4 to expand decoding to 32 or more outputs. Because both enables are active-low and ORed internally, connecting Yx to E1/E2 of another unit allows hierarchical selection-e.g., first-level decode selects group, second-level selects within group. The CD74HC154EG4 truth table and functional diagram explicitly validate this configuration.