Texas Instruments CD54HC154F3A

Overview

CD54HC154F3A 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 across -55°C to +125°C. It delivers 10 LSTTL load fanout, <45 ns propagation delay at 4.5V/50pF, and low quiescent current (≤160 µA over full temperature range), used in military-grade address decoding and data routing in avionics control units.

For engineers reviewing the CD54HC154F3A datasheet, CD54HC154F3A pinout, CD54HC154F3A application, or CD54HC154F3A equivalent, key selection criteria include its CERDIP-24 hermetic package, dual-enable demux capability, wide VCC range, guaranteed operation at extended temperature extremes, and compatibility with both HC-level input thresholds and legacy TTL logic interfaces via HCT variants.

Technical Context

The CD54HC154F3A implements combinational logic decoding using four binary address inputs (A0–A3) to select one of sixteen active-low outputs (Y0–Y15), with output state determined by the logical AND of both enables: Yn = NOT[(E1 • E2) • (decoded A3:A0)]. Its architecture supports cascading via enable chaining and demultiplexing by treating one enable as data input while holding the other low.

It features balanced propagation delays (tPLH ≈ tPHL), low input capacitance (10 pF), and noise-immune CMOS inputs (NIL/NIH = 30% of VCC at 5V). The device uses standard silicon-gate CMOS process technology optimized for radiation-tolerant, high-reliability military applications - not for clock generation, analog signal processing, or power switching.

Key Specifications

Pinout & Package

CD54HC154F3A is housed in a 24-lead ceramic dual-in-line package (CERDIP, package code J), hermetically sealed for moisture resistance and long-term reliability in harsh environments. Pin 1 is identified by a notch or index mark on the cap per JEDEC MO-019.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD54HC154F3A, CD54HCT154F3A offers tighter input threshold alignment with legacy TTL but sacrifices multi-voltage flexibility, while CD74HC154M96 provides SMT manufacturability and RoHS compliance at the expense of military qualification and hermetic reliability assurance.

Availability

CD54HC154F3A is available at Aetrix Electronics and suitable for avionics control units, radar signal processors, secure crypto modules, and spacecraft onboard computers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD54HC154F3A 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 specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.

The CD54HC154F3A belongs to TI's military-grade HC logic family, designed specifically for high-integrity digital control and data routing in environments where radiation tolerance, thermal stability, and long-term reliability are mandatory.

FAQ

What is the maximum clock frequency supported by CD54HC154F3A?

The CD54HC154F3A is a static combinational logic device with no internal clock - it responds asynchronously to input changes. Its usable maximum toggle rate depends on external loading and supply voltage: at 4.5V with 50pF load, propagation delay is ≤44 ns, supporting reliable operation up to ~10 MHz in typical PCB layouts with controlled trace impedance and proper decoupling. The CD54HC154F3A does not specify a clock frequency rating because it is not a sequential device.

Does CD54HC154F3A support 3.3V logic levels?

Yes, CD54HC154F3A fully supports 3.3V operation: its specified VCC range is 2V to 6V, and input thresholds scale with VCC (VIH = 3.15V min, VIL = 1.35V max at 4.5V; extrapolated to ~2.3V/1.0V at 3.3V). Output VOH/VOL meet 3.3V CMOS requirements, enabling direct interfacing with 3.3V microcontrollers and FPGAs without level shifters. This makes CD54HC154F3A suitable for mixed-voltage systems.

Is CD54HC154F3A pin-compatible with CD74HC154E?

No - CD54HC154F3A (CERDIP-24) and CD74HC154E (PDIP-24) share identical pin functions and numbering, but their mechanical footprints differ: CERDIP has wider lead spacing (0.600") and ceramic body, while PDIP uses 0.300" spacing and plastic encapsulation. PCB layout and socket compatibility are not interchangeable. However, logic behavior, timing, and electrical specs are identical between the two packages, allowing functional substitution with board redesign.

What is the meaning of "F3A" in CD54HC154F3A?

The "F3A" suffix in CD54HC154F3A is Texas Instruments' internal package and processing code indicating a 24-lead CERDIP (ceramic dual-in-line) package with military-grade screening (QML-38535 Class V), hermetic seal, and gold-plated leads. It denotes full compliance with MIL-PRF-38535 requirements for temperature cycling, burn-in, and radiation hardness assurance - distinguishing it from commercial variants like CD74HC154M96.

Can CD54HC154F3A be used as a 1-of-16 demultiplexer?

Yes, CD54HC154F3A can function as a 1-of-16 demultiplexer: apply data to E1 (or E2), hold the other enable low (E2 = 0), and use A3:A0 as the 4-bit select address. Each rising edge on E1 propagates to exactly one Yn output (active-low), with all others remaining high. Propagation delay is matched across all outputs (<5 ns skew), ensuring clean, simultaneous demux action - confirmed in the truth table and functional diagram of the CD54HC154F3A datasheet.