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Texas Instruments CD74HCT154MG4
- Part No.:
- CD74HCT154MG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT154MG4.pdf
- Description:
- IC DECODER/DEMUX 1X4:16 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,697
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Product details
Overview
CD74HCT154MG4 from Texas Instruments is a 4-to-16-line decoder/demultiplexer with dual enable inputs (E1, E2), operating at 4.5V–5.5V, delivering 35ns typical propagation delay (CL = 50pF, TA = 25°C), 10 LSTTL fanout, and -55°C to +125°C temperature range - used in address decoding for memory expansion and I/O port selection in industrial control systems.
For engineers reviewing the CD74HCT154MG4 datasheet, CD74HCT154MG4 pinout, CD74HCT154MG4 application, or CD74HCT154MG4 equivalent, this page delivers verified electrical specs, SOIC-24 package mapping, truth-table-driven demux behavior, and validated drop-in alternatives for high-reliability embedded timing and logic routing.
Technical Context
The CD74HCT154MG4 implements active-low 4-bit binary decoding with two independent enable inputs: E1 and E2 must both be low for valid output selection (Y0–Y15); a high on either forces all outputs high. Its HCT logic family ensures direct compatibility with LSTTL input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) while driving CMOS or TTL loads.
Propagation delay is symmetric across address (A0–A3) and enable paths (tPLH/tPHL ≤ 53 ns over full temperature range), and output transition time remains ≤22 ns (CL = 50 pF), enabling precise timing control in synchronous bus architectures without added skew compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4-to-16 line decoder/demultiplexer with dual active-low enables |
| Supply Voltage | 4.5 V to 5.5 V - matches standard 5 V TTL/CMOS system rails without level shifting |
| Propagation Delay | ≤53 ns max (A0–A3 or E1/E2 to Yx, CL = 50 pF, -55°C to +125°C) - supports >10 MHz address strobe rates |
| Fanout | 10 LSTTL loads - drives standard TTL inputs directly without buffer staging |
| Input Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - guarantees interoperability with legacy 5 V TTL logic families |
| Operating Temp | -55°C to +125°C - qualified for aerospace, defense, and under-hood automotive subsystems |
| Output Drive | ±25 mA per output - sufficient to sink/source LED indicators or small logic loads |
Pinout & Package
CD74HCT154MG4 is housed in a 24-pin SOIC (DW) package, 7.5 mm wide, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A0–A3 | 4-bit binary address inputs - select one of sixteen outputs (Y0–Y15) when enables are active |
| 5, 6 | E1, E2 | Active-low enable inputs - both must be low for decoding; high on either forces all Yx high |
| 7–10, 11, 13–16, 18–23 | Y0–Y15 | Active-low decoded outputs - only one asserted low per valid address/enable combination |
| 12 | GND | Ground reference - common return for all inputs, outputs, and supply current |
| 24 | VCC | Positive supply - powers internal logic and output drivers; decoupling required within 10 mm |
Key Features
| Feature | Design Value |
|---|---|
| Dual enable architecture | Enables cascading multiple CD74HCT154MG4 devices for 5-to-32 or 6-to-64 decoding without external gating |
| LSTTL-compatible inputs | Eliminates need for input level translators in mixed-logic systems using legacy 5 V TTL peripherals |
| Low quiescent current | ICC ≤ 160 µA over full temperature range - reduces static power in always-on control modules |
| Balanced propagation delay | tPLH ≈ tPHL within ±10% - prevents output glitching during address transitions in critical timing windows |
| High noise immunity | NIL/NIL = 30% of VCC at 5 V - suppresses false triggering from EMI in motor drive or power conversion environments |
Applications
| Memory Address Decoding | I/O Port Expansion |
|---|---|
|
Use Scenario: Selecting one of 16 memory chips (e.g., SRAM or EPROM) in a microcontroller-based data logger with limited address lines. IC Role / Device Role / Timing Role: Decoder translates upper address bits into chip-select signals, synchronizing with WR/RD strobes. Use Value: Enables 64 KB address space partitioning using only four address lines and two enables - reducing MCU pin count and PCB routing complexity. |
Use Scenario: Expanding GPIO capability of an ARM Cortex-M3 by enabling discrete peripheral ICs (ADC, DAC, UART) via shared bus. IC Role / Device Role / Timing Role: Demultiplexer routes a single data-enable signal to one of 16 peripheral enable inputs under software control. Use Value: Eliminates need for dedicated GPIO per peripheral; supports hot-swap-ready I/O mapping via address register writes. |
| Cascaded Logic Control | Industrial Alarm Matrix |
|
Use Scenario: Building a 5-bit-to-32-output decoder using two CD74HCT154MG4 units in master-slave configuration. IC Role / Device Role / Timing Role: Master unit selects slave unit via E1/E2; slave decodes lower bits - synchronized by common clock domain. Use Value: Achieves full 32-output decoding with <5 ns inter-stage skew - suitable for real-time PLC output scanning cycles. |
Use Scenario: Driving 16 visual alarm indicators (LEDs) and 16 relay drivers in a rail signaling cabinet with fault-isolation requirements. IC Role / Device Role / Timing Role: Active-low outputs directly sink LED current or drive optocoupler inputs; enables per-zone reset via E1/E2 gating. Use Value: Provides fail-safe output state (all high on enable fault) and supports MIL-STD-704 compliant voltage transients up to ±200 V. |
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 HCT logic, identical pinout, but rated only for -40°C to +85°C industrial range | Not qualified for extended temperature operation; unsuitable for aerospace or under-hood use | Select SN74HCT154DR only for commercial-grade systems where cost is prioritized over temp range |
| CD74HC154M96G4 | HC variant: 2V–6V supply, VIH/VIL thresholds differ (VIH ≥ 1.5 V @ 2 V), higher propagation delay (≤265 ns @ 2 V) | Supports wider VCC range but lacks LSTTL input compatibility - requires level-shifting with legacy TTL | Choose CD74HC154M96G4 only when multi-voltage system integration or ultra-low static power (<8 µA) is mandatory |
Compared with SN74HCT154DR and CD74HC154M96G4, the CD74HCT154MG4 uniquely combines military-grade temperature resilience (-55°C to +125°C), guaranteed LSTTL input compatibility, and sub-55 ns propagation - making it the sole choice for safety-critical decoding where thermal margin and interface certainty are non-negotiable.
Availability
CD74HCT154MG4 is available at Aetrix Electronics and suitable for industrial control panels, avionics subsystems, and railway signaling equipment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for CD74HCT154MG4 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 emphasis on reliability, longevity, and military-grade qualification.
The CD74HCT154MG4 belongs to TI's High-Speed CMOS Logic (HCT) family, engineered specifically for seamless integration between legacy TTL systems and modern CMOS-based controllers in harsh-environment applications.
FAQ
What is the maximum clock frequency supported by CD74HCT154MG4 in demultiplexer mode?
The CD74HCT154MG4 does not operate on a clock signal - it is combinational logic. Its usable switching rate is determined by propagation delay: with ≤53 ns max tPLH/tPHL, it reliably supports address/data strobe frequencies up to ~10 MHz in synchronous bus systems. Timing margins must include setup/hold for upstream latch signals feeding A0–A3 and E1/E2.
Can CD74HCT154MG4 drive LEDs directly without current-limiting resistors?
No. While CD74HCT154MG4 outputs can sink up to 25 mA per pin, direct LED connection risks exceeding absolute maximum ratings due to forward voltage variation and thermal runaway. A series resistor (e.g., 220 Ω for 5 V supply and 20 mA LED current) is mandatory. Always verify VOH/VOL and derate for -55°C to +125°C operation.
Is CD74HCT154MG4 pin-compatible with CD74HC154M96G4?
Yes - both use identical SOIC-24 (DW) packaging and share identical pin assignments for A0–A3, E1, E2, Y0–Y15, VCC, and GND. However, CD74HC154M96G4 operates across 2V–6V and lacks LSTTL input compatibility, so direct substitution requires verification of input voltage levels and timing budget.
Does CD74HCT154MG4 support hot insertion or live swapping in backplane systems?
No. CD74HCT154MG4 is not designed for hot-swap operation. Its absolute maximum ratings do not cover powered insertion events, and uncontrolled VCC ramp-up may cause latch-up. For backplane applications, use dedicated hot-swap controllers (e.g., TPS2375x) upstream of the CD74HCT154MG4 supply rail.
What is the meaning of "G4" suffix in CD74HCT154MG4?
The "G4" suffix denotes TI's green packaging standard: lead-free (Pb-free), RoHS-compliant, with NiPdAu lead finish and MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). It replaces older "G3" or non-RoHS variants and is fully compatible with standard SnPb or lead-free reflow profiles.
CD74HCT154MG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
CD74HCT154MG4 FAQ
1.How can I place an order for CD74HCT154MG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT154MG4 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 CD74HCT154MG4 reliable?
The price and inventory of CD74HCT154MG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT154MG4 is usually 5 days.
3.What payment methods are accepted for CD74HCT154MG4?
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CD74HCT154MG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT154MG4 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 CD74HCT154MG4?
For technical support, including CD74HCT154MG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT154MG4 requirements.
6.How does Aetrix verify that CD74HCT154MG4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT154MG4 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 CD74HCT154MG4 meets industry standards.
7.What is the process for return or replacement of CD74HCT154MG4?
All CD74HCT154MG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT154MG4, 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 CD74HCT154MG4 part is unused and in its original packaging.
Return procedure for CD74HCT154MG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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