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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments CD74ACT139ME4

Name: CD74ACT139ME4
Brand: Texas Instruments
SKU: CD74ACT139ME4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD74ACT139ME4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: CD74ACT139ME4.pdf

Description:: IC DECODER/DEMUX 1X2:4 16SOIC

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Product details

Overview

CD74ACT139ME4 from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in SOIC-16 package, operating at 4.5 V to 5.5 V, with ±24 mA output drive, 3.1–10.5 ns propagation delay (t_PHL/t_PLH), 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 CD74ACT139ME4 datasheet, CD74ACT139ME4 pinout, CD74ACT139ME4 application, or CD74ACT139ME4 equivalent, key selection criteria include its dual-decoder architecture with independent active-low enables (1G, 2G), balanced propagation delays, SCR-latchup-resistant CMOS process, and compatibility with fast-enable memory systems requiring negligible added system delay.

Technical Context

The CD74ACT139ME4 implements two independent 2-to-4 decoders, each with fully buffered inputs (A, B) and an active-low enable (G). Each decoder drives four active-low outputs (Y0–Y3), with logic states determined by the function table: when G = L, outputs decode A/B per binary input; when G = H, all outputs are high.

It uses ACT (Advanced CMOS TTL-compatible) technology-offering bipolar-equivalent speed (comparable to F/AS/S families) with CMOS power efficiency. Its design supports cascading via enable chaining and demultiplexing via G-input use as data line, while maintaining noise immunity at ≥30% V_CC.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5-V supply rails with margin for ripple and tolerance.
Propagation Delay (t_PHL/t_PLH)	3.1 ns (min) to 10.5 ns (max) at V_CC = 5 V, C_L = 50 pF - Enables sub-11 ns address decoding critical for high-speed memory access timing budgets.
Output Drive	±24 mA - Supports fanout to 15 F-series TTL loads without external buffering, simplifying interface to legacy logic.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - Guarantees robust TTL-level compatibility and noise margin >1.5 V at 5 V supply.
Quiescent ICC	8 µA (typ) at 5.5 V - Delivers ultra-low static power for always-on decode paths in power-sensitive embedded control.
ESD Protection	≥2 kV per MIL-STD-883 Method 3015 - Provides production-ready handling robustness without additional board-level protection.
Operating Temp	–55°C to +125°C - Qualified for extended-temperature industrial, aerospace, and defense applications per CD74ACT139M specification.

Pinout & Package

CD74ACT139ME4 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 θ_JA = 73°C/W enables reliable operation up to 125°C ambient without forced airflow.

Pin/Terminal	Circuit Role	Design Meaning
1G, 2G	Active-low enable inputs	Gate each decoder independently; tied together or cascaded to expand decoding depth or implement data gating.
1A, 1B / 2A, 2B	Binary select inputs	Address bits for respective decoder; fully buffered to present only one normalized load to driving source.
1Y0–1Y3 / 2Y0–2Y3	Active-low decoded outputs	Assert low on matching A/B combination when corresponding G is low; open-collector behavior not supported - outputs are push-pull.
V_CC (Pin 16)	Positive supply	Single 4.5–5.5 V rail powers both decoders; no separate logic/analog supplies required.
GND (Pin 8)	Ground reference	Common return for all I/O and internal circuitry; layout requires low-inductance connection to minimize switching noise.

Key Features

Feature	Design Value
Dual independent decoders	Enables simultaneous decoding of two 2-bit address buses (e.g., memory bank + peripheral select) without inter-stage delay.
Active-low enable with data-line capability	Allows 1G or 2G to serve as demultiplexer data input - enabling 1-bit-to-4-channel distribution with minimal external logic.
Balanced t_PHL/t_PLH	Minimizes duty-cycle distortion in clocked routing applications and ensures predictable timing margins across temperature.
SCR-latchup-resistant CMOS process	Eliminates need for system-level latchup mitigation (e.g., current limiting, power sequencing) in mixed-voltage or noisy environments.
TTL-compatible input thresholds	Interoperates directly with 74LS, 74F, and microcontroller GPIO without level-shifting, reducing BOM count and layout complexity.

Applications

Memory Address Decoding	Peripheral Select Logic
Use Scenario: Selecting one of four SRAM or ROM chips in a 16-bit microprocessor system using A1–A0 address lines and chip-enable strobe. IC Role / Device Role / Timing Role: Dual decoder maps low-order address bits to individual chip-select signals; G inputs synchronized to processor CE# for cycle-accurate activation. Use Value: Propagation delay <11 ns ensures CS assertion occurs within memory access window, eliminating wait states in 25-MHz bus systems.	Use Scenario: Routing UART, SPI, or I²C peripherals to a shared controller bus based on configuration register bits. IC Role / Device Role / Timing Role: Acts as static peripheral selector - A/B driven by config bits, G controlled by bus arbitration logic to prevent contention. Use Value: ±24 mA drive sinks bus pull-ups directly, supporting up to 15 F-family loads without external drivers or buffers.
Industrial I/O Expansion	Test Equipment Signal Routing
Use Scenario: Enabling discrete output channels (relays, LEDs, solenoids) in PLC I/O modules using microcontroller GPIO. IC Role / Device Role / Timing Role: Decoder translates 2-bit port output into 4-channel enable signals; G inputs tied to master enable for group shutdown. Use Value: –55°C to +125°C rating and 2-kV ESD support ensure reliability in uncontrolled factory-floor environments with EMI and thermal cycling.	Use Scenario: Switching calibration reference signals between DUT ports in automated test equipment (ATE) with precise timing control. IC Role / Device Role / Timing Role: Functions as low-jitter signal router - G inputs driven by sequencer to gate references synchronously with measurement triggers. Use Value: Balanced propagation delays (<0.5 ns skew between Y0–Y3) maintain phase coherence across routed analog/digital reference paths.

Memory Address Decoding

Peripheral Select Logic

Use Scenario: Selecting one of four SRAM or ROM chips in a 16-bit microprocessor system using A1–A0 address lines and chip-enable strobe.

IC Role / Device Role / Timing Role: Dual decoder maps low-order address bits to individual chip-select signals; G inputs synchronized to processor CE# for cycle-accurate activation.

Use Value: Propagation delay <11 ns ensures CS assertion occurs within memory access window, eliminating wait states in 25-MHz bus systems.

Use Scenario: Routing UART, SPI, or I²C peripherals to a shared controller bus based on configuration register bits.

IC Role / Device Role / Timing Role: Acts as static peripheral selector - A/B driven by config bits, G controlled by bus arbitration logic to prevent contention.

Use Value: ±24 mA drive sinks bus pull-ups directly, supporting up to 15 F-family loads without external drivers or buffers.

Industrial I/O Expansion

Test Equipment Signal Routing

Use Scenario: Enabling discrete output channels (relays, LEDs, solenoids) in PLC I/O modules using microcontroller GPIO.

IC Role / Device Role / Timing Role: Decoder translates 2-bit port output into 4-channel enable signals; G inputs tied to master enable for group shutdown.

Use Value: –55°C to +125°C rating and 2-kV ESD support ensure reliability in uncontrolled factory-floor environments with EMI and thermal cycling.

Use Scenario: Switching calibration reference signals between DUT ports in automated test equipment (ATE) with precise timing control.

IC Role / Device Role / Timing Role: Functions as low-jitter signal router - G inputs driven by sequencer to gate references synchronously with measurement triggers.

Use Value: Balanced propagation delays (<0.5 ns skew between Y0–Y3) maintain phase coherence across routed analog/digital reference paths.

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 logic family, identical pinout (SOIC-16), but rated for –40°C to +85°C industrial range only.	Not qualified for extended-temp (-55°C to +125°C) operation; unsuitable for aerospace or under-hood automotive use.	Select SN74ACT139DR only if ambient temperature remains within commercial/industrial range and cost sensitivity outweighs temp margin.
CD74HC139M96	High-speed CMOS (HC) variant - slower max speed (21 ns delay), lower drive (±5.2 mA), but wider V_CC range (2–6 V).	Acceptable for low-power, multi-supply systems (e.g., 3.3 V logic), but cannot replace CD74ACT139ME4 in 5-V, high-fanout, or timing-critical designs.	Choose CD74HC139M96 only when supply voltage flexibility or ultra-low ICC (<2 µA) is prioritized over speed and drive strength.

Compared with SN74ACT139DR and CD74HC139M96, the CD74ACT139ME4 uniquely delivers military-grade temperature range, bipolar-speed performance, and 24-mA drive in a single SOIC-16 package - making it the sole option for high-reliability 5-V systems demanding both timing precision and environmental ruggedness.

Availability

CD74ACT139ME4 is available at Aetrix Electronics and suitable for memory decoding, industrial I/O expansion, test equipment signal routing, and peripheral selection applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD74ACT139ME4 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 decades of heritage in high-reliability logic families and industrial-grade qualification.

The CD74ACT139ME4 belongs to TI's CD74ACT advanced CMOS logic series, designed specifically for high-speed, low-power, TTL-compatible interfacing in mission-critical industrial, defense, and computing infrastructure.

FAQ

What is the maximum operating temperature range for CD74ACT139ME4?

The CD74ACT139ME4 is specified for operation from –55°C to +125°C, meeting extended-temperature requirements for aerospace, defense, and harsh-environment industrial applications. This rating is confirmed in the official TI datasheet SCHS337 and applies to the CD74ACT139M variant, which includes the CD74ACT139ME4 marking configuration.

Does CD74ACT139ME4 support 3.3-V logic inputs?

No - CD74ACT139ME4 is designed for 4.5-V to 5.5-V V_CC operation and features TTL-compatible input thresholds (V_IH ≥ 2.0 V, V_IL ≤ 0.8 V). While 3.3-V CMOS outputs may meet V_IH margin at room temperature, they fall outside guaranteed switching specifications across temperature and voltage extremes; level-shifting is recommended for reliable 3.3-V interface.

Can CD74ACT139ME4 be used as a 1-to-4 demultiplexer?

Yes - each half of the CD74ACT139ME4 can function as a 1-to-4 demultiplexer by using the active-low enable (G) as the data input and A/B as select lines. When G = L, the selected Yx output goes low per A/B state; all outputs remain high when G = H. This is explicitly supported in the device's functional description and timing diagrams.

Is CD74ACT139ME4 pin-compatible with CD74ACT139E (PDIP package)?

Yes - CD74ACT139ME4 (SOIC-16) and CD74ACT139E (PDIP-16) share identical pin numbering, signal assignment, and electrical functionality. The only differences are package type, thermal characteristics (θ_JA = 73°C/W vs. 67°C/W), and moisture sensitivity level (MSL-1 vs. non-Pb-free tube packaging).

What is the typical power dissipation capacitance (C_pd) of CD74ACT139ME4?

The typical power dissipation capacitance (C_pd) of CD74ACT139ME4 is 83 pF, as measured at V_CC = 5 V and T_A = 25°C. This value is used to estimate dynamic power consumption (P_dyn ≈ C_pd × V_CC² × f_in) in high-frequency switching applications.

CD74ACT139ME4 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

CD74ACT139ME4 FAQ

1.How can I place an order for CD74ACT139ME4 through Aetrix?

Please submit a Request for Quotation (RFQ) for CD74ACT139ME4 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 CD74ACT139ME4 reliable?

The price and inventory of CD74ACT139ME4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT139ME4 is usually 5 days.

3.What payment methods are accepted for CD74ACT139ME4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT139ME4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD74ACT139ME4?

CD74ACT139ME4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD74ACT139ME4 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 CD74ACT139ME4?

For technical support, including CD74ACT139ME4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT139ME4 requirements.

6.How does Aetrix verify that CD74ACT139ME4 is sourced from the original manufacturer or authorized distributors?

All CD74ACT139ME4 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 CD74ACT139ME4 meets industry standards.

7.What is the process for return or replacement of CD74ACT139ME4?

All CD74ACT139ME4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT139ME4, 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 CD74ACT139ME4 part is unused and in its original packaging.

Return procedure for CD74ACT139ME4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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