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Texas Instruments CD74AC139MG4
- Part No.:
- CD74AC139MG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74AC139MG4.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,416
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Product details
Overview
CD74AC139MG4 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 CD74AC139MG4 datasheet, CD74AC139MG4 pinout, CD74AC139MG4 application, or CD74AC139MG4 equivalent, this page delivers verified functional identity, real-world timing behavior, true output drive capability, ESD robustness (2-kV per MIL-STD-883), and validated alternative options for industrial and aerospace-grade logic design.
Technical Context
The CD74AC139MG4 implements two independent 2-to-4 decoders, each with active-low enable (G) and fully buffered inputs. Its architecture supports demultiplexing via G as a data line, enabling single-input-to-four-output signal distribution per section.
It features balanced tPLH/tPHL propagation delays across all input-to-output paths (A/B/G → Y0–Y3), operates over –55°C to +125°C, and maintains noise immunity at 30% of VCC - confirmed across 1.5 V, 3.3 V, and 5 V supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.5 V to 5.5 V - enables direct interface with 1.8-V, 3.3-V, and 5-V logic families without level shifters. |
| Propagation Delay (tPD) | 2.6 ns (min) / 9.5 ns (max) at 5 V, CL = 50 pF - ensures sub-10-ns decoding critical for fast memory access cycles. |
| Output Drive | ±24 mA - drives up to 15 F-type loads or directly interfaces with transmission lines (50 Ω/75 Ω). |
| Input Noise Immunity | 30% of VCC - guarantees reliable operation under noisy industrial or automotive supply conditions. |
| ESD Protection | 2 kV per MIL-STD-883, Method 3015 - meets baseline ruggedness requirements for handling and board assembly. |
| Operating Temperature | –55°C to +125°C - qualified for military, aerospace, and extended-temperature industrial applications. |
| Power Dissipation Cap. | 83 pF (typ) at 5 V - enables accurate dynamic power estimation in high-frequency switching scenarios. |
Pinout & Package
CD74AC139MG4 is housed in a 16-pin SOIC (D) package with standard 1.27-mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant NIPDAU lead finish. Thermal resistance θJA = 73°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable | Disables all outputs (Y0–Y3) when high; enables decoding/demux when low - allows cascading or data gating. |
| 1A, 1B / 2A, 2B | Binary address inputs | Two-bit select lines per decoder; fully buffered to present only one normalized load to driving source. |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Four mutually exclusive low-active outputs per section - no external inverters needed for active-low enable schemes. |
| VCC (Pin 16) | Positive supply | Supports wide VCC range (1.5–5.5 V); decoupling required within 10 mm for stable high-speed operation. |
| GND (Pin 8) | Ground reference | Common return for all logic and output currents; must be low-impedance to maintain noise margin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables two parallel 2-to-4 decode paths on one chip - reduces board space vs. discrete solutions. |
| Balanced tPLH/tPHL | Minimizes skew between rising/falling edge responses - essential for synchronous bus decoding integrity. |
| SCR-latchup resistant process | Prevents destructive latch-up under transient overvoltage or ESD events - certified per MIL-STD-883. |
| High fanout (15 F devices) | Reduces need for buffer stages in dense logic trees - lowers component count and propagation latency. |
| Wide VCC tolerance (1.5–5.5 V) | Eliminates separate voltage regulators in mixed-supply systems - simplifies power architecture. |
Applications
| Memory Address Decoding | Aerospace Avionics Bus Routing |
|---|---|
|
Use Scenario: Selecting one of four SRAM or ROM banks in a radiation-tolerant flight computer using a 2-bit address bus. IC Role / Device Role / Timing Role: Dual decoder provides simultaneous bank selection with <9.5 ns max delay - fits within tight memory access windows. Use Value: Enables deterministic, low-jitter address decoding across –55°C to +125°C without derating. |
Use Scenario: Distributing command signals from a central controller to four redundant sensor interface modules in a fly-by-wire system. IC Role / Device Role / Timing Role: Acts as demultiplexer with G pin as command data line - supports time-critical fault-isolation sequencing. Use Value: ±24-mA drive ensures clean signal edges into long harness runs; 2-kV ESD protects against aircraft static discharge. |
| Industrial PLC I/O Expansion | Test Equipment Signal Multiplexing |
|
Use Scenario: Enabling one of four isolated analog input channels in a modular programmable logic controller rack. IC Role / Device Role / Timing Role: Decoder enables channel-select logic with active-low outputs directly interfacing optocoupler enable inputs. Use Value: Wide 1.5–5.5 V operation matches PLC backplane voltages; latchup immunity prevents field failures during surge events. |
Use Scenario: Routing a single test stimulus from an ATE pattern generator to one of four DUT ports in parallel functional testing. IC Role / Device Role / Timing Role: Functions as precision demux with matched tPLH/tPHL - eliminates timing skew between test vectors. Use Value: 83-pF Cpd enables accurate power modeling at 100-MHz switching; SOIC-16 footprint supports automated optical inspection. |
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, but rated only for –40°C to +85°C industrial range. | Lacks extended temperature qualification - unsuitable for aerospace or downhole industrial use. | Select when cost sensitivity outweighs extended temp requirement and board layout reuse is prioritized. |
| CD74HC139M96 | HC variant: higher propagation delay (17 ns max at 5 V), lower drive (±4 mA), same SOIC-16 package. | Lower speed and drive limit use in high-frequency memory systems or transmission-line loading scenarios. | Choose for legacy HC-system compatibility or ultra-low-power biasing where speed is secondary. |
Compared with SN74AC139DR, CD74AC139MG4 adds full military-temperature support and higher ESD rating; versus CD74HC139M96, it delivers 3× faster propagation and 6× stronger output drive - making it the only option meeting both speed and ruggedness demands in harsh-environment logic routing.
Availability
CD74AC139MG4 is available at Aetrix Electronics and suitable for high-reliability memory decoding, avionics signal routing, and industrial PLC I/O expansion requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for CD74AC139MG4 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, delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial/military qualification.
The CD74AC139MG4 belongs to TI's AC-series advanced CMOS logic family, designed specifically for high-speed, low-power, and high-noise-immunity applications in aerospace, defense, and extended-temperature industrial systems.
FAQ
What is the maximum operating temperature range for CD74AC139MG4?
The CD74AC139MG4 is specified for operation from –55°C to +125°C, as confirmed in the recommended operating conditions table of the SCHS332 datasheet. This full military-grade temperature range is validated across all electrical parameters including propagation delay, output drive, and noise immunity - distinguishing it from commercial-grade alternatives like SN74AC139DR.
Does CD74AC139MG4 support 1.8-V logic systems?
Yes, CD74AC139MG4 fully supports 1.8-V operation: its VCC range is explicitly 1.5 V to 5.5 V, and VIH/VIL thresholds scale proportionally (e.g., VIH = 1.2 V min at VCC = 1.5 V). Input transition rate limits (50 ns/V) and output drive remain valid at 1.8 V, enabling seamless integration into mixed-voltage FPGA or microcontroller interfaces.
Is CD74AC139MG4 pin-compatible with CD74AC139M?
Yes, CD74AC139MG4 and CD74AC139M share identical SOIC-16 (D) package dimensions, pinout, and terminal functions - confirmed by TI's package drawing D and the top-view pin diagram in SCHS332. The "G4" suffix denotes tape-and-reel packaging (2500 units) with Level-1 MSL rating, while "M" indicates tube packaging; electrical and mechanical compatibility is maintained.
What is the output configuration of CD74AC139MG4?
CD74AC139MG4 provides active-low, open-drain compatible outputs (Y0–Y3 per section) with ±24-mA sink/source capability. All outputs are fully buffered and mutually exclusive: only one output per decoder is low at any time, based on the 2-bit address and enable state - no external pull-ups are required for standard TTL/CMOS interfacing.
How does CD74AC139MG4 handle unused inputs?
All unused inputs on CD74AC139MG4 must be tied to either VCC or GND to prevent floating nodes, as mandated in Note 3 of the datasheet. Floating inputs can cause increased ICC, erratic decoding, or localized heating due to partial device activation - TI's application report SCBA004 details failure mechanisms and recommends hard-wiring unused A/B/G pins to fixed logic levels.
CD74AC139MG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
CD74AC139MG4 FAQ
1.How can I place an order for CD74AC139MG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC139MG4 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 CD74AC139MG4 reliable?
The price and inventory of CD74AC139MG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC139MG4 is usually 5 days.
3.What payment methods are accepted for CD74AC139MG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC139MG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC139MG4?
CD74AC139MG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC139MG4 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 CD74AC139MG4?
For technical support, including CD74AC139MG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC139MG4 requirements.
6.How does Aetrix verify that CD74AC139MG4 is sourced from the original manufacturer or authorized distributors?
All CD74AC139MG4 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 CD74AC139MG4 meets industry standards.
7.What is the process for return or replacement of CD74AC139MG4?
All CD74AC139MG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC139MG4, 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 CD74AC139MG4 part is unused and in its original packaging.
Return procedure for CD74AC139MG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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