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Texas Instruments CD74HCT139M96G4
- Part No.:
- CD74HCT139M96G4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT139M96G4.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
CD74HCT139M96G4 from Texas Instruments is a dual 2-to-4 line decoder/demultiplexer in SOIC-16 package, operating at 4.5V–5.5V with LSTTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V), active-low mutually exclusive outputs, and -55°C to +125°C temperature range-used in memory decoding and data routing for industrial control systems.
For engineers reviewing the CD74HCT139M96G4 datasheet, CD74HCT139M96G4 pinout, CD74HCT139M96G4 application, or CD74HCT139M96G4 equivalent, key selection criteria include its HCT logic family compatibility with LS TTL, dual independent enable-controlled decoding paths, 34 ns typical propagation delay (CL = 50 pF), low input leakage (≤1 µA), and SOIC tape-and-reel packaging for automated assembly.
Technical Context
The CD74HCT139M96G4 integrates two identical 2-to-4 decoders, each with one active-low enable (1E/2E) and two binary select inputs (A0/A1), driving four active-low outputs (Y0–Y3). Outputs are mutually exclusive and high-impedance when enabled is inactive.
It implements standard combinational logic with no internal latching or clocking; enable serves as both chip select in cascaded configurations and data input in demultiplexer mode. The device is functionally identical to CD4556B and pin compatible with it.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - ensures direct interface with LSTTL inputs without level shifting |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V TTL/CMOS system rails |
| Propagation Delay (A0/A1 → Y) | 34 ns max at 4.5 V, CL = 50 pF - supports reliable timing in sub-30 MHz address decoding |
| Input Voltage Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - guarantees robust noise margin vs. legacy TTL |
| Output Drive Capability | 10 LSTTL loads - sufficient for fanout to multiple downstream logic gates |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial and aerospace environments |
| Quiescent Current (ICC) | 8 µA typical at 25°C - enables low-static-power operation in always-on subsystems |
Pinout & Package
CD74HCT139M96G4 is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012, 1.27 mm pitch, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1E, 2E | Active-low enable inputs | Enable/disable respective decoder; high = all outputs forced high |
| 1A0, 1A1 / 2A0, 2A1 | Binary select inputs | Address bits selecting one of four active-low outputs per decoder |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Only one output low per decoder when enable is asserted; mutually exclusive |
| VCC (Pin 16), GND (Pin 8) | Power supply terminals | Single 5 V supply; decoupling required within 1 cm for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables simultaneous decoding of two 2-bit address buses without inter-channel crosstalk |
| LSTTL input compatibility | Eliminates need for external level shifters when interfacing with legacy 74LS-series controllers |
| Wide temperature range | Supports deployment in under-hood automotive ECUs and downhole oilfield electronics |
| Low power consumption | Reduces thermal load in dense PCB layouts where dozens of decoders operate concurrently |
| Pin compatibility with CD4556B | Allows drop-in replacement in existing designs using that CMOS decoder, preserving layout |
Applications
| Memory Address Decoding | Data Routing in Industrial PLCs |
|---|---|
Use Scenario: Selecting one of four SRAM banks in a microcontroller-based data logger operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Dual decoder maps upper address bits to individual chip-select lines, enabling banked memory access with <35 ns setup time. Use Value: Eliminates discrete gate-based decoding logic, reducing BOM count by 12 components and PCB area by 28 mm². |
Use Scenario: Distributing sensor input signals from a multiplexed analog front-end to four isolated ADC channels in an industrial programmable logic controller. IC Role / Device Role / Timing Role: Acts as synchronous demultiplexer, using enable as data strobe and A0/A1 as channel index to route sampled values. Use Value: Provides deterministic 1:4 signal path selection with <1 ns skew between outputs, critical for synchronized sampling. |
| Legacy System Interface Adapter | Test Equipment Signal Selection |
Use Scenario: Bridging a modern FPGA I/O bank (3.3 V LVTTL) to legacy 5 V TTL peripherals requiring discrete address decoding. IC Role / Device Role / Timing Role: Translates FPGA-generated 2-bit address + enable into four 5 V-compatible chip-select signals. Use Value: Maintains full timing compliance with 74LS138 timing budgets while avoiding level-shifter ICs and associated board space. |
Use Scenario: Configuring stimulus paths in automated test equipment that routes calibration signals to one of four DUT ports based on controller command. IC Role / Device Role / Timing Role: Functions as static configuration switch; outputs drive LED indicators and relay drivers simultaneously. Use Value: Delivers 10 LSTTL load drive strength per output, directly controlling opto-isolators without buffer stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC139M96 | HC logic family: 2 V–6 V supply, higher VIH/VIL thresholds (VIH ≥ 1.5 V @ 2 V), 25 ns slower max propagation at 5 V | Used where mixed-voltage systems (e.g., 3.3 V control + 5 V peripherals) require broader supply tolerance | Select when supply rail flexibility outweighs need for strict LSTTL compatibility |
| SN74LS139N | Bipolar TTL: 4.75 V–5.25 V only, higher ICC (19 mA typical), 25 ns typical tPD, no wide-temp rating | Deployed in legacy 5 V-only boards where pinout matches but thermal margin is constrained | Choose only for direct replacement in existing LS-based designs with no thermal or power constraints |
Compared with CD74HC139M96, CD74HCT139M96G4 offers tighter input thresholds for guaranteed LS-TTL interoperability; versus SN74LS139N, it delivers 5× lower quiescent current and extended temperature support-critical for new designs targeting reliability and efficiency.
Availability
CD74HCT139M96G4 is available at Aetrix Electronics and suitable for memory decoding, industrial PLC I/O expansion, legacy interface adaptation, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for CD74HCT139M96G4 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 CD74HCT139M96G4 belongs to TI's High-Speed CMOS Logic family, designed specifically for seamless integration between modern CMOS controllers and legacy TTL systems in harsh-environment applications.
FAQ
What is the maximum propagation delay of CD74HCT139M96G4 at 5 V supply?
The maximum propagation delay for CD74HCT139M96G4 is 51 ns (A0/A1 or E to Y) under worst-case conditions (-55°C to +125°C, VCC = 4.5 V, CL = 50 pF), per the official Texas Instruments datasheet SCHS148D. This value ensures timing compliance in systems with ≥10 MHz address bus toggling rates. CD74HCT139M96G4 maintains consistent delay across both decoder sections.
Is CD74HCT139M96G4 pin compatible with CD4556B?
Yes, CD74HCT139M96G4 is pin compatible with CD4556B as confirmed in the functional description section of the datasheet: "This device is functionally the same as the CD4556B and is pin compatible with it." Both share identical 16-pin SOIC pinout, including VCC (16), GND (8), dual enable (1E/2E), select inputs (A0/A1), and active-low outputs (Y0–Y3). CD74HCT139M96G4 retains this mapping without modification.
Does CD74HCT139M96G4 support demultiplexer operation?
Yes, CD74HCT139M96G4 supports demultiplexer operation: the enable input (1E or 2E) functions as the data input, while A0 and A1 serve as select lines to route that single-bit input to one of four active-low outputs. This is explicitly stated in the device description: "For demultiplexer operation the enable input is the data input." CD74HCT139M96G4 performs this function without additional external components.
What is the input leakage current specification for CD74HCT139M96G4?
The input leakage current (II) for CD74HCT139M96G4 is specified as ±1 µA maximum over the full temperature range (-55°C to +125°C) at VCC = 5.5 V, per the HCT DC Electrical Specifications table. This low leakage ensures minimal loading on upstream drivers and supports reliable operation in battery-backed or high-impedance sensing circuits. CD74HCT139M96G4 meets this spec under all valid input voltage conditions.
Can CD74HCT139M96G4 operate outside the 4.5 V–5.5 V range?
No, CD74HCT139M96G4 is rated exclusively for 4.5 V to 5.5 V supply operation, as defined in the Operating Conditions table. Operation below 4.5 V risks incorrect logic thresholds and increased propagation delay; above 5.5 V violates absolute maximum ratings and may cause permanent damage. The HCT family's LSTTL compatibility depends on this narrow window. CD74HCT139M96G4 must be powered within this range for guaranteed functionality.
CD74HCT139M96G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- 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:
- 16-SOIC
CD74HCT139M96G4 FAQ
1.How can I place an order for CD74HCT139M96G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT139M96G4 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 CD74HCT139M96G4 reliable?
The price and inventory of CD74HCT139M96G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT139M96G4 is usually 5 days.
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Once your CD74HCT139M96G4 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 CD74HCT139M96G4?
For technical support, including CD74HCT139M96G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT139M96G4 requirements.
6.How does Aetrix verify that CD74HCT139M96G4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT139M96G4 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 CD74HCT139M96G4 meets industry standards.
7.What is the process for return or replacement of CD74HCT139M96G4?
All CD74HCT139M96G4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT139M96G4, 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 CD74HCT139M96G4 part is unused and in its original packaging.
Return procedure for CD74HCT139M96G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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