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Texas Instruments CD74AC139E
- Part No.:
- CD74AC139E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74AC139E.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:822
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Product details
Overview
CD74AC139E from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in 16-pin PDIP package, operating from 1.5 V to 5.5 V, with ±24-mA output drive, 2.6 ns (min) propagation delay at 5 V, and SCR-latchup-resistant CMOS process - used for high-speed memory decoding and data routing in industrial control and instrumentation systems.
For engineers reviewing the CD74AC139E datasheet, CD74AC139E pinout, CD74AC139E application, or CD74AC139E equivalent, key selection considerations include supply voltage range (1.5–5.5 V), active-low enable architecture, balanced tPLH/tPHL timing, ESD protection (>2 kV), and compatibility with F/AS/S-speed logic families while consuming significantly less power.
Technical Context
The CD74AC139E integrates two independent decoders, each with active-low enable (G), two address inputs (A, B), and four active-low outputs (Y0–Y3). Its fully buffered inputs present only one normalized load, minimizing loading on upstream drivers.
It supports cascading via shared or independent enables and allows the G input to function as a data line in demultiplexing mode. Propagation delays are balanced across all input-to-output paths (A/B→Y, G→Y), with tPLH/tPHL matching within 0.2 ns at 5 V/CL = 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.5 V to 5.5 V - enables interoperability with 1.8-V, 3.3-V, and 5-V logic domains without level shifters. |
| tPLH / tPHL (5 V) | 2.6 ns (min) to 10.5 ns (max) - ensures sub-11-ns worst-case delay for high-speed memory decode timing budgets. |
| IOL / IOH | ±24 mA - drives up to 15 F-series TTL loads directly, eliminating need for buffer stages in fanout-critical designs. |
| Input Clamp Current | ±20 mA - protects against transient overvoltage events during hot-swap or signal fault conditions. |
| ESD Protection | >2 kV per MIL-STD-883 Method 3015 - meets industrial-grade robustness requirements for board-level reliability. |
| Power Dissipation Cap. | 83 pF - quantifies dynamic power consumption at 5 V; enables accurate switching-power estimation in clocked systems. |
Pinout & Package
CD74AC139E uses a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and standard through-hole mounting. Pin 1 is located at the top-left corner (notch-side indicator), and the package complies with JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable | Disables entire decoder section when high; allows G to serve as data input in demux mode. |
| 1A, 1B / 2A, 2B | Address inputs | Binary-select lines determining which of four outputs (Y0–Y3) goes low per decoder section. |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Each Yx asserts low only when corresponding G is low and address matches; open-collector compatible behavior. |
| 8 | GND | Ground reference for all internal circuitry and output current return path. |
| 16 | VCC | Primary power supply rail; supports wide-range operation from 1.5 V to 5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables two parallel 2-to-4 decode paths on single chip - reduces PCB area vs. discrete solutions. |
| Balanced noise immunity | 30% of VCC threshold margin - improves noise rejection in electrically noisy industrial environments. |
| SCR-latchup resistance | Qualified per JEDEC JESD78 - prevents destructive latchup under I/O stress or supply transients. |
| Buffered inputs | One normalized load per input - simplifies driving from high-impedance sources like microcontroller GPIOs. |
| Wide temperature range | –55°C to +125°C operation - supports deployment in extended-temperature industrial and aerospace applications. |
Applications
| Memory Address Decoding | Data Routing in Test Equipment |
|---|---|
|
Use Scenario: Selecting one of four memory banks in a microcontroller-based data logger with external SRAM and flash. IC Role / Device Role / Timing Role: Dual decoder provides simultaneous bank enable signals with matched propagation delay to avoid skew-induced bus contention. Use Value: Sub-11 ns max delay at 5 V ensures decode latency remains negligible versus typical 70-ns SRAM access time. |
Use Scenario: Routing digital stimulus signals from a pattern generator to four DUT channels in automated test equipment. IC Role / Device Role / Timing Role: Acts as synchronous demultiplexer using G as data input and A/B as channel select; outputs drive 50-Ω transmission lines. Use Value: ±24-mA drive capability supports direct 50-Ω line driving without external buffers, reducing component count. |
| Industrial PLC I/O Expansion | Legacy Bus Interface Logic |
|
Use Scenario: Expanding discrete output points in a programmable logic controller by decoding two PLC CPU address bits into four relay driver enables. IC Role / Device Role / Timing Role: Provides galvanically isolated enable signals to optocoupled relay drivers; operates reliably across –40°C to +85°C ambient. Use Value: Wide VCC range (1.5–5.5 V) accommodates both 3.3-V CPU rails and 5-V relay driver supplies without regulation. |
Use Scenario: Interfacing a modern FPGA with legacy 5-V parallel bus peripherals requiring 2-to-4 address expansion. IC Role / Device Role / Timing Role: Bridges voltage domains and translates FPGA address bits to peripheral chip-select signals with deterministic timing. Use Value: Balanced tPLH/tPHL and 2-kV ESD rating ensure signal integrity and field reliability in mixed-voltage backplane systems. |
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 |
|---|---|---|---|
| SN74AC139N | Same AC logic family, identical pinout and DC specs; differs in packaging (SOIC-16 vs. PDIP-16) and MSL rating. | Preferred for surface-mount production; not suitable for through-hole prototyping or manual soldering. | Select SN74AC139N when board space and reflow assembly constrain package choice. |
| CD74HC139E | HC-family variant: higher VCC max (6 V), slower speed (19 ns max @ 5 V), lower drive (±4 mA), no SCR-latchup guarantee. | Better suited for low-power, cost-sensitive consumer applications where speed and ruggedness are secondary. | Choose CD74HC139E only if system timing budget exceeds 15 ns and latchup immunity is not required. |
Compared with SN74AC139N and CD74HC139E, the CD74AC139E uniquely combines through-hole PDIP packaging, industrial temperature range (–55°C to +125°C), ±24-mA drive, and SCR-latchup resistance - making it optimal for ruggedized, high-reliability embedded systems where layout flexibility and field robustness are critical.
Availability
CD74AC139E is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, PLC I/O modules, and legacy bus interface designs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74AC139E 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, performance, and broad application support.
The CD74AC139E belongs to TI's Advanced CMOS (AC) logic family, engineered for high-speed, low-power digital interfacing in industrial, military, and automotive systems where timing precision and ruggedness are essential.
FAQ
What is the maximum operating temperature range for CD74AC139E?
The CD74AC139E is rated for operation from –55°C to +125°C, meeting extended-temperature requirements for industrial and aerospace applications. This specification is verified per the manufacturer's recommended operating conditions and applies across the full 1.5-V to 5.5-V supply range. The CD74AC139E maintains specified timing and drive performance throughout this range, with derated parameters published in the official datasheet.
Does CD74AC139E support 1.8-V logic systems?
Yes, CD74AC139E supports 1.8-V operation as part of its 1.5-V to 5.5-V VCC range. At 1.8 V, it delivers guaranteed VIH/VIL thresholds (1.2 V/0.3 V), functional switching (tPLH/tPHL ≤ 131 ns), and ±24-mA output drive. This makes CD74AC139E compatible with modern low-voltage microcontrollers and FPGAs without level translation.
Can CD74AC139E be used as a demultiplexer?
Yes, CD74AC139E can operate as a dual 1-to-4 demultiplexer by using the active-low enable (G) input as the data line and A/B as select lines. Each decoder section routes the inverted G signal to one of four outputs based on the binary value of A and B. This functionality is explicitly documented in the device's function table and logic diagram.
Is CD74AC139E pin-compatible with CD74HC139E?
No, CD74AC139E and CD74HC139E are not pin-compatible. While both use 16-pin PDIP packages and share identical pin numbering and signal assignments, they belong to different logic families (AC vs. HC) with distinct electrical characteristics - including drive strength, noise margins, and propagation delay - that affect system-level timing and loading behavior. Interchange requires full validation.
What is the meaning of "SCR-latchup-resistant" for CD74AC139E?
"SCR-latchup-resistant" means the CD74AC139E employs process and circuit design techniques to prevent silicon-controlled rectifier (SCR) latchup - a destructive failure mode triggered by I/O or supply transients. This qualification is verified per JEDEC JESD78 and ensures reliable operation in harsh environments where voltage spikes or ground bounce may occur, a key requirement for industrial and military applications.
CD74AC139E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74AC139E FAQ
1.How can I place an order for CD74AC139E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC139E 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 CD74AC139E reliable?
The price and inventory of CD74AC139E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC139E is usually 5 days.
3.What payment methods are accepted for CD74AC139E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC139E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC139E?
CD74AC139E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC139E 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 CD74AC139E?
For technical support, including CD74AC139E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC139E requirements.
6.How does Aetrix verify that CD74AC139E is sourced from the original manufacturer or authorized distributors?
All CD74AC139E 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 CD74AC139E meets industry standards.
7.What is the process for return or replacement of CD74AC139E?
All CD74AC139E units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC139E, 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 CD74AC139E part is unused and in its original packaging.
Return procedure for CD74AC139E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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