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Texas Instruments CD74ACT139MG4
- Part No.:
- CD74ACT139MG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74ACT139MG4.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,264
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Product details
Overview
CD74ACT139MG4 from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in SOIC-16 package, operating at 4.5 V–5.5 V supply, with ±24 mA output drive, balanced propagation delays (≤10.5 ns), and TTL-compatible inputs. It serves as a high-speed address decoder in memory subsystems and data-routing logic where low-latency enable-controlled signal distribution is required.
For engineers reviewing the CD74ACT139MG4 datasheet, CD74ACT139MG4 pinout, CD74ACT139MG4 application, or CD74ACT139MG4 equivalent, this page delivers verified functional identity, SOIC-16 terminal mapping, timing-critical design parameters, and validated alternative options for memory decoding and demux architectures.
Technical Context
The CD74ACT139MG4 integrates two independent decoders, each with active-low enable (G), two select inputs (A, B), and four active-low outputs (Y0–Y3). Its fully buffered inputs present only one normalized load per input, minimizing driver loading in cascaded logic trees.
It employs ACT (Advanced CMOS TTL-compatible) process technology-offering bipolar-equivalent speed (sub-11 ns propagation) with CMOS power efficiency (ICC ≤ 80 µA at 25°C), SCR-latchup resistance, and 2-kV ESD protection per MIL-STD-883 Method 3015.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL/CMOS systems without level-shifting. |
| Propagation Delay (tPLH/tPHL) | ≤10.5 ns @ VCC = 5 V, CL = 50 pF - Enables use in sub-100-MHz address decode paths with negligible system delay penalty. |
| Output Drive | ±24 mA - Supports fanout to 15 F-series TTL loads or direct driving of 50-Ω transmission lines at 85°C. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches TTL voltage levels, allowing direct interfacing with legacy 5-V logic families. |
| Quiescent ICC | ≤80 µA @ –40°C to 85°C - Reduces static power in always-on control logic without compromising speed. |
| ESD Protection | ≥2 kV HBM - Meets MIL-STD-883 requirement, enabling robust handling in industrial assembly environments. |
| Operating Temp | –55°C to 125°C - Qualified for extended-temperature military and aerospace applications per CD74ACT139M specification. |
Pinout & Package
CD74ACT139MG4 is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, JEDEC MS-012AC compliant, moisture sensitivity level 1 (260°C reflow unlimited), and RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable input | Each controls its respective decoder; when high, all outputs forced high (disabled); used as data line in demux mode. |
| 1A, 1B / 2A, 2B | Binary select inputs | Address bits selecting one of four active-low outputs per decoder; fully buffered, 1-unit load per A/B input. |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Four mutually exclusive low outputs per decoder; sink/source capable of ±24 mA for direct LED or bus driving. |
| VCC (Pin 16) | Positive supply | Must be decoupled locally; supports 4.5–5.5 V operation with stable regulation critical for timing consistency. |
| GND (Pin 8) | Ground reference | Common return for all I/O and supply currents; requires low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables simultaneous decoding of two 2-bit address buses (e.g., upper/lower memory banks) on single IC, reducing board space and interconnect count. |
| Balanced tPLH/tPHL | Ensures symmetrical rise/fall timing across all outputs, critical for glitch-free address selection in synchronous memory systems. |
| SCR-latchup-resistant process | Guarantees immunity to destructive latchup under overvoltage or ESD transients, supporting reliable operation in harsh environments. |
| Low input capacitance (Ci = 10 pF) | Minimizes switching power and signal degradation on long PCB traces, preserving edge integrity in high-speed routing. |
| TTL-compatible thresholds | Eliminates need for external level shifters when interfacing with legacy 5-V microcontrollers, FPGAs, or ASICs. |
Applications
| Memory Address Decoding | Peripheral Select Logic |
|---|---|
Use Scenario: Selecting one of four SRAM or ROM chips in a 16-bit embedded system using 2-bit chip-select lines. IC Role / Device Role / Timing Role: Dual decoder maps CPU address bits A1–A0 to individual /CS lines; enables zero-wait-state access by keeping decode delay <11 ns. Use Value: Eliminates discrete gate-based decoding, reduces propagation skew between chip selects, and maintains full memory bandwidth. |
Use Scenario: Routing UART, SPI, or GPIO signals to four different peripheral modules (e.g., sensors, displays, actuators) via shared bus. IC Role / Device Role / Timing Role: Acts as demultiplexer: G input driven by controller select signal, A/B set by firmware to route data to target peripheral. Use Value: Provides deterministic, low-jitter signal routing without software overhead or FPGA resource usage. |
| Industrial I/O Expansion | Test Equipment Signal Routing |
Use Scenario: Expanding digital I/O capability of PLC CPU by enabling eight isolated output drivers (four per decoder section). IC Role / Device Role / Timing Role: Decoder outputs drive optocoupler enable inputs; G inputs synchronized to scan cycle clock for time-multiplexed output updates. Use Value: Achieves precise, jitter-free output sequencing across 8 channels with single-cycle enable control. |
Use Scenario: Configuring signal paths in automated test equipment (ATE) to connect DUT pins to measurement instruments (DMM, scope, pattern generator). IC Role / Device Role / Timing Role: Used in front-end matrix control logic; outputs switch relay drivers or analog mux select lines based on test step configuration. Use Value: Delivers sub-12 ns path selection latency, ensuring tight timing correlation between stimulus and measurement capture. |
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 |
|---|---|---|---|
| SN74ACT139DR | Same ACT family, identical pinout and AC/DC specs; TI's commercial-grade variant with –40°C to 85°C rating. | Not qualified for extended temperature or military use; lacks CD74ACT139M's –55°C to 125°C range. | Select when cost-sensitive commercial designs do not require extended temperature operation. |
| 74ACT139PC | PDIP-16 package (vs. SOIC-16); identical electrical specs but larger footprint and higher thermal resistance (θJA = 67°C/W). | Suitable for prototyping or through-hole assembly; incompatible with surface-mount production lines requiring SOIC tape-and-reel. | Choose for breadboard validation or legacy through-hole systems where SOIC reflow is unavailable. |
Compared with SN74ACT139DR and 74ACT139PC, the CD74ACT139MG4 uniquely combines extended temperature qualification (–55°C to 125°C), SOIC-16 surface-mount compatibility, and full military-grade reliability testing-making it the only option for high-reliability embedded systems requiring both ruggedness and modern packaging.
Availability
CD74ACT139MG4 is available at Aetrix Electronics and suitable for memory subsystems, industrial PLC I/O expansion, test equipment signal routing, and aerospace avionics requiring stable component supply across extended temperature ranges.
Supply support for CD74ACT139MG4 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in high-reliability components.
The CD74ACT139MG4 belongs to TI's Advanced CMOS (ACT) logic family-designed specifically for high-speed, low-power 5-V systems requiring TTL compatibility, extended temperature operation, and robust ESD/latchup immunity.
FAQ
What is the maximum operating temperature range for CD74ACT139MG4?
The CD74ACT139MG4 is rated for operation from –55°C to 125°C, matching the CD74ACT139M specification and qualifying it for military, aerospace, and high-reliability industrial applications where ambient temperatures exceed commercial limits. This range is confirmed in TI's official packaging addendum and recommended operating conditions table.
Does CD74ACT139MG4 support 3.3-V logic interfaces?
No-CD74ACT139MG4 requires a 4.5 V to 5.5 V supply and has TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), making it unsuitable for direct 3.3-V interface without level translation. Its ACT family architecture is optimized for 5-V systems, and operation below 4.5 V is not characterized or guaranteed.
Is CD74ACT139MG4 pin-compatible with CD74ACT139M96?
Yes-CD74ACT139MG4 and CD74ACT139M96 share identical SOIC-16 (D) package dimensions, pinout, and electrical specifications; the "G4" suffix denotes TI's green packaging standard (lead-free, RoHS-compliant), while M96 indicates tape-and-reel packaging. Both are functionally and physically interchangeable.
What is the purpose of the dual enable inputs (1G and 2G) on CD74ACT139MG4?
The 1G and 2G inputs provide independent enable control for each decoder section: when high, all four outputs (Y0–Y3) of that section go high-impedance (inactive); when low, decoding proceeds normally. In demultiplexing mode, G can serve as the data input while A/B select the output channel, enabling 1-to-4 signal distribution with minimal external logic.
How does CD74ACT139MG4 achieve balanced propagation delays?
CD74ACT139MG4 achieves balanced tPLH and tPHL (≤10.5 ns) through matched internal transistor sizing and symmetric output stage design within its ACT CMOS process. This balance ensures equal rise and fall timing across all Y outputs, preventing glitches during address transitions and maintaining setup/hold margins in synchronous memory systems.
CD74ACT139MG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 24mA, 24mA
- 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
CD74ACT139MG4 FAQ
1.How can I place an order for CD74ACT139MG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT139MG4 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 CD74ACT139MG4 reliable?
The price and inventory of CD74ACT139MG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT139MG4 is usually 5 days.
3.What payment methods are accepted for CD74ACT139MG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT139MG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT139MG4?
CD74ACT139MG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT139MG4 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 CD74ACT139MG4?
For technical support, including CD74ACT139MG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT139MG4 requirements.
6.How does Aetrix verify that CD74ACT139MG4 is sourced from the original manufacturer or authorized distributors?
All CD74ACT139MG4 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 CD74ACT139MG4 meets industry standards.
7.What is the process for return or replacement of CD74ACT139MG4?
All CD74ACT139MG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT139MG4, 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 CD74ACT139MG4 part is unused and in its original packaging.
Return procedure for CD74ACT139MG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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