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Texas Instruments CD74AC139M96
- Part No.:
- CD74AC139M96
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74AC139M96.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,170
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Product details
Overview
CD74AC139M96 from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in SOIC-16 package, operating from 1.5 V to 5.5 V, with ±24-mA output drive, balanced propagation delays (as low as 2.6 ns at 5 V), and SCR-latchup-resistant CMOS process. It serves in high-speed memory decoding and data routing where negligible system delay is critical.
For engineers reviewing the CD74AC139M96 datasheet, CD74AC139M96 pinout, CD74AC139M96 application, or CD74AC139M96 equivalent, key selection factors include its dual-decoder architecture with active-low enable inputs, wide supply range compatibility, ESD protection exceeding 2 kV per MIL-STD-883, and operation across –55°C to 125°C industrial/military temperature range.
Technical Context
The CD74AC139M96 integrates two independent 2-to-4 decoders, each with fully buffered inputs and an active-low enable (G) input usable as a data line in demultiplexing mode. Its logic function follows standard positive-logic truth table: outputs go low only when G is low and select inputs A/B match one of four binary combinations.
It employs TI's AC CMOS process delivering bipolar-equivalent speed (e.g., 2.6–10.5 ns tPLH/tPHL at 5 V, CL = 50 pF) with significantly reduced power consumption versus F/AS/S families. Input transition rate tolerance is specified at 20 ns/V for VCC ≥ 3.6 V and 50 ns/V for VCC ≤ 3 V, supporting robust signal integrity in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 5.5 V - supports direct interface with 1.8-V, 3.3-V, and 5-V logic domains without level shifters. |
| Propagation Delay (tPLH/tPHL) | 2.6 ns min / 9.5 ns max at VCC = 5 V, CL = 50 pF - enables use in sub-100-MHz address decoding paths. |
| Output Drive Current | ±24 mA - drives up to 15 F-series TTL loads or terminates 50-Ω transmission lines at 85°C. |
| Input Noise Immunity | 30% of VCC - ensures reliable operation under noisy supply or crosstalk conditions. |
| ESD Protection | >2 kV per MIL-STD-883, Method 3015 - meets baseline ruggedness requirements for industrial PCB handling. |
| Operating Temperature | –55°C to +125°C - qualified for extended-range military and automotive under-hood applications. |
| Power Dissipation Capacitance | 83 pF - enables accurate dynamic power estimation at high switching frequencies. |
Pinout & Package
CD74AC139M96 uses a 16-pin SOIC (D) package with standard JEDEC outline, 1.27-mm pitch, and gull-wing leads. Thermal impedance θJA is 73°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable input | Each controls one decoder section; low enables decoding, high forces all Y outputs high (disabled state). |
| 1A, 1B / 2A, 2B | Binary address inputs | Select one of four outputs per decoder (Y0–Y3); fully buffered to present only one normalized load. |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Each output goes low when corresponding G is low and A/B match its index; open-drain compatible with wired-OR configurations. |
| VCC (Pin 16) | Positive supply | Single rail powers both decoders; supports 1.5–5.5 V with stable noise immunity across full range. |
| GND (Pin 8) | Ground reference | Common return for all inputs, outputs, and internal logic; requires low-impedance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables simultaneous decoding of two 2-bit address buses-reduces component count vs. discrete single decoders. |
| Balanced propagation delays | Minimizes skew between Y outputs and across sections, critical for synchronous memory enable timing alignment. |
| SCR-latchup-resistant process | Prevents destructive latch-up during overvoltage transients or hot-insertion events in backplane systems. |
| Wide-input voltage tolerance | VIH/VIL thresholds scale with VCC (e.g., VIH = 3.85 V at 5.5 V), ensuring interoperability across mixed-supply designs. |
| Low ICC quiescent current | Max 160 µA at 5.5 V - reduces standby power in battery-backed or always-on control modules. |
Applications
| Memory Address Decoding | Bus Demultiplexing |
|---|---|
Use Scenario: Selecting one of four SRAM or ROM chips in a microcontroller-based embedded system with limited address lines. IC Role / Device Role / Timing Role: Dual decoder maps 2-bit chip-select bus to four individual /CS signals, with propagation delay <10 ns ensuring no access-time penalty. Use Value: Eliminates need for cascaded logic or PLD-based decoding, reducing BOM cost and board area while maintaining deterministic timing. | Use Scenario: Routing a single serial data stream to one of four peripheral UARTs based on command header bits. IC Role / Device Role / Timing Role: Acts as demultiplexer using active-low G input as data path; enables real-time channel selection without clock domain crossing. Use Value: Leverages built-in enable-as-data capability to avoid external gating logic, simplifying firmware control and reducing latency jitter. |
| Industrial I/O Expansion | Military System Enable Control |
Use Scenario: Driving eight discrete LED indicators or relay drivers from two microcontroller GPIOs in factory automation PLC modules. IC Role / Device Role / Timing Role: Provides 1-of-4 active-low output per section to directly sink current into LEDs or optocouplers. Use Value: ±24-mA drive per output eliminates external transistor buffers, enabling compact, high-reliability indicator subsystems. | Use Scenario: Enabling/disabling four redundant sensor signal conditioning channels in avionics health-monitoring units. IC Role / Device Role / Timing Role: Dual enable inputs (1G/2G) serve as independent safety interlocks; outputs assert /ENABLE to downstream analog switches. Use Value: –55°C to +125°C rating and 2-kV ESD protection ensure operational integrity in harsh airborne environments. |
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 |
|---|---|---|---|
| SN74AC139DR | Same AC logic family, identical pinout and function; rated for –40°C to +85°C only. | Limited to commercial/industrial ambient; not suitable for extended temperature deployments. | Choose when cost sensitivity outweighs extended temperature requirement and board space allows rework for thermal derating. |
| CD74HC139M96 | HC-family variant: higher propagation delay (14 ns typical at 5 V), lower drive (±4 mA), but wider VCC range (2–6 V). | Better suited for low-power, low-speed systems where fanout and noise margin are prioritized over speed. | Select when system clock rates are below 20 MHz and supply rails may exceed 5.5 V, accepting longer decode latency. |
Compared with SN74AC139DR and CD74HC139M96, the CD74AC139M96 uniquely delivers military-grade temperature range, 24-mA drive, and sub-10-ns propagation in a single SOIC-16 package-making it optimal for high-reliability, high-speed decoding where thermal and electrical margins are non-negotiable.
Availability
CD74AC139M96 is available at Aetrix Electronics and suitable for high-reliability memory decoding, industrial I/O expansion, avionics enable control, and military data routing requiring stable component supply across extended temperature ranges.
Supply support for CD74AC139M96 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and aerospace markets.
The CD74AC139M96 belongs to TI's AC logic family-designed for high-speed, low-power digital interfacing in systems demanding bipolar-equivalent performance with CMOS efficiency and ruggedness.
FAQ
What is the maximum operating temperature range for CD74AC139M96?
The CD74AC139M96 is rated for continuous operation from –55°C to +125°C. This extended temperature range is verified per the device's qualification and packaging specifications, making CD74AC139M96 suitable for deployment in military, aerospace, and under-hood automotive applications where thermal extremes are expected.
Does CD74AC139M96 support 1.8-V logic interfaces?
Yes, CD74AC139M96 supports 1.8-V operation: its recommended VCC range is 1.5 V to 5.5 V, and input thresholds scale proportionally (e.g., VIH ≈ 1.26 V at 1.8 V). The device maintains balanced noise immunity at 30% of VCC, ensuring robust 1.8-V signal integrity without external level translation.
Can CD74AC139M96 be used as a demultiplexer?
Yes, CD74AC139M96 can operate as a dual 1-to-4 demultiplexer. The active-low enable inputs (1G and 2G) serve as data inputs, while A/B select lines determine output routing. When G is low, the selected Y output goes low; all others remain high-enabling true demux functionality without additional logic.
What is the output drive capability of CD74AC139M96?
CD74AC139M96 provides ±24-mA output drive per Y pin at VCC = 4.5–5.5 V. This allows direct fanout to 15 F-series TTL loads or driving 50-Ω transmission lines, verified at 85°C and 125°C. The specification is measured with one output active at a time, ensuring thermal stability under sustained load.
Is CD74AC139M96 pin-compatible with CD74AC139M?
Yes, CD74AC139M96 and CD74AC139M share identical SOIC-16 (D) package, pinout, and electrical specifications. The "M96" suffix denotes tape-and-reel packaging (2500 units/reel, MSL Level-1), whereas "M" indicates tube packaging-both are functionally and mechanically interchangeable on PCBs.
CD74AC139M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74AC139M96 FAQ
1.How can I place an order for CD74AC139M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC139M96 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 CD74AC139M96 reliable?
The price and inventory of CD74AC139M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC139M96 is usually 5 days.
3.What payment methods are accepted for CD74AC139M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC139M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC139M96?
CD74AC139M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC139M96 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 CD74AC139M96?
For technical support, including CD74AC139M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC139M96 requirements.
6.How does Aetrix verify that CD74AC139M96 is sourced from the original manufacturer or authorized distributors?
All CD74AC139M96 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 CD74AC139M96 meets industry standards.
7.What is the process for return or replacement of CD74AC139M96?
All CD74AC139M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC139M96, 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 CD74AC139M96 part is unused and in its original packaging.
Return procedure for CD74AC139M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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