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Texas Instruments CD74HCT154M
- Part No.:
- CD74HCT154M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT154M.pdf
- Description:
- IC DECODER/DEMUX 1X4:16 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
CD74HCT154M from Texas Instruments is a 4-to-16-line decoder/demultiplexer with dual enable inputs (E1, E2), operating at 4.5V–5.5V, supporting -55°C to +125°C industrial/military temperature range, with 35 ns typical propagation delay (CL = 50 pF, VCC = 4.5 V), and designed for address decoding in microprocessor systems and memory expansion.
For engineers reviewing the CD74HCT154M datasheet, CD74HCT154M pinout, CD74HCT154M application, or CD74HCT154M equivalent, this page delivers verified functional identity, SOIC-24 package mapping, truth-table–driven output behavior, LSTTL-compatible input thresholds, and validated alternatives for high-reliability decoding tasks.
Technical Context
The CD74HCT154M implements active-low 4-bit binary decoding: inputs A0–A3 select one of sixteen Y0–Y15 outputs, while E1 and E2 must both be low for valid decode operation; a high on either enable forces all outputs high. Its HCT logic family ensures direct compatibility with LSTTL voltage levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) at 5 V supply.
It features balanced propagation delays across all paths (address-to-output, E1-to-output, E2-to-output), 10 LSTTL fanout capability, and CMOS-level quiescent current (ICC ≤ 160 µA over full temperature range), enabling stable operation in noise-sensitive embedded control and data acquisition subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4-to-16 line decoder/demultiplexer with dual active-low enables |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures interoperability with standard 5 V TTL/LSTTL systems |
| Propagation Delay (A→Y) | 35 ns typ @ VCC = 4.5 V, CL = 50 pF - supports ≤20 MHz address strobe rates in bus decoding |
| Input Thresholds | VIH(min) = 2.0 V, VIL(max) = 0.8 V - guarantees reliable logic-level translation from legacy LSTTL sources |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, defense, and under-hood automotive applications |
| Fanout Capability | 10 LSTTL loads - drives multiple downstream logic gates without buffering |
| Output Drive | ±25 mA per output - sufficient for direct LED indication or small-signal switching |
Pinout & Package
CD74HCT154M is housed in a 24-pin SOIC (DW) package with 0.300-inch body width, JEDEC MS-013 compliant, moisture sensitivity level 1, and lead finish NiPdAu/Sn.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A0, A1, A2, A3 | 4-bit binary address inputs - determine which of Y0–Y15 is asserted low during decode |
| 5, 6 | E1, E2 | Active-low enable inputs - both must be low for decoding; either high disables all outputs (Y0–Y15 = high) |
| 7–10, 19–22 | Y0–Y15 | 16 decoded outputs - active-low, open-drain compatible via external pull-up; only one low per valid input combination |
| 12 | GND | Ground reference - common return for all internal logic and output drivers |
| 24 | VCC | Positive supply - powers internal CMOS circuitry; requires local 0.1 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Dual enable architecture | Enables cascading of multiple CD74HCT154M units for 5+ bit decoding or demultiplexing with single data path |
| LSTTL input compatibility | Eliminates level-shifting circuitry when interfacing with legacy 74LS/74ALS families |
| Wide temperature operation | Supports deployment in uncontrolled environments including avionics bays and engine control modules |
| Low dynamic power | CPD = 84 pF enables predictable power estimation (PD = VCC² × fi × (CPD + CL)) for thermal design |
| ESD protection | Rated per JEDEC JS-001 - requires standard IC handling procedures to prevent gate oxide damage |
Applications
| Microprocessor Address Decoding | Memory Bank Selection |
|---|---|
Use Scenario: Selecting one of 16 peripheral I/O registers or memory-mapped devices in an 8-bit microcontroller system. IC Role / Device Role / Timing Role: Decoder translates upper address bits (A0–A3) into individual chip-select lines, synchronized with address latch enable. Use Value: Reduces external logic count by replacing discrete NAND/AND gates; maintains deterministic 35 ns decode latency across all 16 outputs. |
Use Scenario: Enabling one of 16 SRAM or EPROM banks in a modular memory expansion subsystem. IC Role / Device Role / Timing Role: Acts as bank-select controller, driven by address bus high-order bits and memory enable signal. Use Value: Ensures glitch-free bank transitions via simultaneous enable gating (E1/E2), preventing partial writes or read corruption during address changes. |
| Industrial PLC I/O Expansion | Aerospace Data Acquisition Multiplexing |
Use Scenario: Routing control signals to 16 isolated digital output modules in a programmable logic controller backplane. IC Role / Device Role / Timing Role: Demultiplexer using E1 as data input and E2 as strobe, with A0–A3 selecting destination module. Use Value: Enables single-wire serial-to-parallel conversion without added shift registers, reducing PCB area and BOM cost. |
Use Scenario: Distributing trigger pulses from a central timing unit to 16 sensor front-end channels in a flight data recorder. IC Role / Device Role / Timing Role: Synchronized decoder ensuring sub-50 ns skew between channel activation events across extreme temperature ranges. Use Value: Guarantees temporal coherence in sampled data streams by maintaining matched propagation delays across all 16 output paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-to-16 decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT154DR | Same logic function, identical pinout, same SOIC-24 package, but TI's newer production version with updated process and RoHS compliance. | No functional change; suitable for new designs requiring latest qualification and longer-term availability. | Select SN74HCT154DR for new designs where long-term supply assurance and modern manufacturing traceability are required. |
| MC74HCT154ADR2G | Pin-compatible 4-to-16 decoder from ON Semiconductor; VIH/VIL thresholds match HCT spec, but max ICC = 200 µA (vs. 160 µA for CD74HCT154M). | Slightly higher quiescent current may impact low-power systems; otherwise drop-in usable in non-critical thermal designs. | Choose MC74HCT154ADR2G only if dual-sourcing is mandated and thermal margin exceeds 20%. |
Compared with CD74HCT154M, SN74HCT154DR offers enhanced lifecycle support and identical electrical behavior, while MC74HCT154ADR2G provides second-source flexibility at the cost of marginally higher static power - critical for battery-operated or thermally constrained deployments.
Availability
CD74HCT154M is available at Aetrix Electronics and suitable for microprocessor address decoding, memory bank selection, industrial PLC I/O expansion, and aerospace data acquisition multiplexing requiring stable component supply across extended temperature ranges.
Supply support for CD74HCT154M 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and aerospace qualification.
The CD74HCT154M belongs to TI's legacy High-Speed CMOS Logic (HCT) family, engineered specifically for seamless integration with TTL-based systems while delivering CMOS power efficiency and rugged temperature performance.
FAQ
What is the logic function of the CD74HCT154M?
The CD74HCT154M is a 4-to-16 line decoder/demultiplexer with two active-low enable inputs (E1 and E2). When both enables are low, it decodes the 4-bit binary input (A0–A3) to assert exactly one of sixteen outputs (Y0–Y15) low; any high enable forces all outputs high. This behavior is defined in the device's truth table and supports address selection and signal routing in digital systems.
Does the CD74HCT154M require external pull-up resistors on its outputs?
Yes, the CD74HCT154M outputs are active-low and not internally pulled up. Each Y0–Y15 output must be terminated with an external pull-up resistor (typically 1–10 kΩ to VCC) to ensure defined high-state voltage when inactive. This configuration allows flexible interfacing with varied load types and voltage domains, consistent with standard TTL/CMOS open-collector practices.
Can the CD74HCT154M operate at 3.3 V supply?
No, the CD74HCT154M is specified only for 4.5 V to 5.5 V operation. Its HCT logic family is optimized for 5 V LSTTL compatibility, with input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive characteristics validated exclusively within that range. Operation at 3.3 V is outside datasheet limits and may result in unreliable switching or excessive ICC.
What is the maximum clock/data rate supported by the CD74HCT154M?
The CD74HCT154M does not operate on a clock; it is combinational logic. Its speed is governed by propagation delay: 35 ns typical (4.5 V, CL = 50 pF) from address or enable input to output transition. This supports reliable operation with address strobes up to ~20 MHz in synchronous systems, assuming setup/hold timing margins are maintained per application layout.
Is the CD74HCT154M pin-compatible with the CD74HC154M?
Yes, the CD74HCT154M and CD74HC154M share identical pinout, package (SOIC-24), and functional block diagram. However, they differ in supply range (HC: 2–6 V; HCT: 4.5–5.5 V) and input thresholds (HC: CMOS-compatible; HCT: LSTTL-compatible). Interchangeability requires matching supply and source logic family - mixing them risks incorrect logic interpretation or increased power draw.
CD74HCT154M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 4:16
- Independent Circuits:
- 1
- Current - Output High, Low:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
CD74HCT154M FAQ
1.How can I place an order for CD74HCT154M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT154M on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD74HCT154M reliable?
The price and inventory of CD74HCT154M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT154M is usually 5 days.
3.What payment methods are accepted for CD74HCT154M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT154M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT154M?
CD74HCT154M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT154M order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD74HCT154M?
For technical support, including CD74HCT154M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT154M requirements.
6.How does Aetrix verify that CD74HCT154M is sourced from the original manufacturer or authorized distributors?
All CD74HCT154M products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD74HCT154M meets industry standards.
7.What is the process for return or replacement of CD74HCT154M?
All CD74HCT154M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT154M, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD74HCT154M part is unused and in its original packaging.
Return procedure for CD74HCT154M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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