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Texas Instruments CD74ACT139M
- Part No.:
- CD74ACT139M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74ACT139M.pdf
- Description:
- CD74ACT139 DUAL 2-TO-4 LINE DECO
- Quantity:
- Payment:
- Shipping:
Inventory:4,549
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Product details
Overview
CD74ACT139M 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, balanced propagation delays (2.9–11.5 ns), and SCR-latchup-resistant CMOS process. It serves in high-speed memory decoding and data routing where low system delay and TTL-compatible input loading are critical.
For engineers reviewing the CD74ACT139M datasheet, CD74ACT139M pinout, CD74ACT139M application, or CD74ACT139M equivalent, key selection criteria include enable-input cascading capability, 16-pin SOIC thermal performance (θJA = 73°C/W), noise immunity at 30% VCC, and compatibility with fast-enable memory subsystems.
Technical Context
The CD74ACT139M 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 A/B input and 0.67 unit load for G, enabling direct fanout to 15 F-type devices without external buffering.
It employs ACT-series CMOS logic with bipolar-equivalent speed but significantly lower power consumption than F/AS/S families. Propagation delays are balanced between tPLH and tPHL, and output drive supports 50-Ω transmission-line loading at 85°C and 75-Ω at 125°C under specified test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage logic systems |
| Output Drive | ±24 mA - supports direct interfacing to multiple TTL loads or moderate-capacitance PCB traces |
| Propagation Delay | 2.9 ns (min) to 11.5 ns (max) - enables sub-10-ns critical path timing in memory decode trees |
| Input Noise Immunity | 30% of VCC - provides robust operation in electrically noisy industrial environments |
| ESD Protection | ≥2 kV per MIL-STD-883 Method 3015 - meets baseline reliability requirements for handling and board assembly |
| Quiescent ICC | 8 µA (typ) at 5.5 V - enables low-static-power operation in standby or battery-backed subsystems |
| Operating Temp | –55°C to +125°C - qualified for extended-temperature military and automotive under-hood applications |
Pinout & Package
CD74ACT139M is housed in a 16-pin SOIC (Package Drawing D), 3.9-mm body width, with standard JEDEC MS-012AC footprint and moisture sensitivity level (MSL) Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable | Each controls its respective decoder; tied together for synchronous demux or cascaded decoding |
| 1A, 1B / 2A, 2B | Binary select inputs | Address bits for 2-to-4 decoding; fully buffered, 1-unit-load (A/B) or 0.67-unit-load (G) |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Assert low for selected address; all high when G = high (disabled state) |
| 8 | GND | Ground reference for logic and output drivers; requires low-impedance PCB plane |
| 16 | VCC | Positive supply; bypassing with 0.1-µF ceramic capacitor near pin recommended |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables compact implementation of two parallel 2:4 decode paths without inter-chip skew or layout overhead |
| Active-low enable as data line | Allows use as 1:4 demultiplexer by driving G with serial data while holding A/B constant |
| Balanced tPLH/tPHL | Minimizes duty-cycle distortion in clocked demux applications and simplifies timing margin analysis |
| SCR-latchup resistance | Prevents destructive latch-up during transient overvoltage or hot-insertion events in ruggedized systems |
| TTL-compatible input thresholds | VIH = 2 V, VIL = 0.8 V - ensures reliable interfacing with legacy 5-V TTL outputs without level shifters |
Applications
| Memory Address Decoding | Peripheral Select Logic |
|---|---|
Use Scenario: Selecting one of four SRAM or ROM chips in a microcontroller-based embedded system with 16-bit address bus. IC Role / Device Role / Timing Role: Dual decoder maps upper address bits to chip-enable lines, minimizing added latency versus memory access time. Use Value: Propagation delay ≤11.5 ns ensures effective system delay remains negligible relative to typical 70-ns memory access times. | Use Scenario: Enabling discrete I/O expanders, ADCs, or DACs on a shared parallel bus in industrial PLC modules. IC Role / Device Role / Timing Role: Acts as peripheral selector, using A/B for device ID and G for bus arbitration handshake. Use Value: ±24-mA drive supports direct control of multiple peripheral CE pins without buffer ICs, reducing BOM count. |
| Bus Demultiplexing | Test Equipment Signal Routing |
Use Scenario: Distributing a single control signal (e.g., reset or interrupt) to one of four functional blocks in FPGA companion logic. IC Role / Device Role / Timing Role: Configured as 1:4 demux using G as data input and A/B held static; outputs drive block-specific reset latches. Use Value: Active-low outputs align with common asynchronous reset polarity, eliminating need for inverters. | Use Scenario: Routing calibration or stimulus signals from a central source to one of four sensor channels in automated test equipment. IC Role / Device Role / Timing Role: Provides deterministic, low-jitter path selection under microprocessor control during self-test sequences. Use Value: Balanced propagation delays ensure channel-to-channel skew <1 ns, critical for phase-coherent multi-channel measurements. |
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 function, pinout, and AC specs; identical SOIC-16 package but TI's commercial-grade variant (–40°C to 85°C) | Limited to industrial temperature range; not rated for –55°C operation or military qualification | Select SN74ACT139DR for cost-sensitive commercial designs where extended temperature is unnecessary |
| CD74HC139M | Same pinout and logic function but HC-series: slower (19 ns max), lower drive (±4 mA), wider VCC (2–6 V) | Supports 3.3-V or mixed-voltage systems but cannot drive heavy TTL loads or meet tight timing budgets | Choose CD74HC139M only when lower power or broader supply range outweighs speed and drive requirements |
Compared with SN74ACT139DR and CD74HC139M, the CD74ACT139M uniquely delivers military-grade temperature range (–55°C to 125°C), ±24-mA drive, and sub-12-ns propagation in a drop-in SOIC-16 package-making it the sole option for high-reliability, high-speed decode in aerospace or under-hood automotive systems.
Availability
CD74ACT139M is available at Aetrix Electronics and suitable for memory decoding, peripheral selection, bus demultiplexing, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74ACT139M 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.
The CD74ACT139M belongs to TI's advanced CMOS (ACT) logic product line, engineered for high-speed memory and data-routing applications demanding TTL-compatible speed with CMOS power efficiency and ruggedness.
FAQ
What is the operating temperature range for CD74ACT139M?
The CD74ACT139M is rated for operation from –55°C to +125°C, meeting extended-temperature requirements for military, aerospace, and under-hood automotive applications. This range is confirmed in the "Recommended Operating Conditions" table of the SCHS337 datasheet and distinguishes it from commercial variants like SN74ACT139DR (–40°C to 85°C). The CD74ACT139M maintains full functionality-including propagation delay and output drive-across this entire range.
Does CD74ACT139M support 3.3-V logic interfaces?
No, CD74ACT139M does not support 3.3-V operation. Its absolute minimum VCC is 4.5 V, and recommended operating range is strictly 4.5 V to 5.5 V. Attempting to operate CD74ACT139M below 4.5 V may result in undefined logic states, increased propagation delay, or failure to meet output voltage specifications (VOH/VOL). For 3.3-V systems, consider CD74HC139M instead.
How many unit loads does each input of CD74ACT139M present?
Each A or B input of CD74ACT139M presents exactly one unit load (2.4 mA at 25°C), while the G (enable) input presents 0.67 unit load. This is defined in the ACT Input Load Table within the SCHS337 datasheet and directly impacts fanout capability-enabling CD74ACT139M to drive up to 15 F-type devices without buffering. Input loading is consistent across temperature and supply voltage.
Can CD74ACT139M be used as a demultiplexer?
Yes, CD74ACT139M can be configured as a 1:4 demultiplexer by using the active-low G input as the data line and holding A and B inputs static (e.g., both low). In this mode, the selected Y output follows the inverted G signal, while all others remain high. This behavior is explicitly described in the device's functional description and verified by the Function Table in the SCHS337 datasheet.
What is the maximum output current rating for CD74ACT139M?
The CD74ACT139M is rated for ±24 mA DC output current per pin under recommended operating conditions (VCC = 4.5 V, TA = –55°C to 125°C), as specified in the "Recommended Operating Conditions" table. Absolute maximum ratings allow ±50 mA, but sustained operation above ±24 mA risks exceeding thermal limits or violating VOH/VOL specs. The ±24 mA rating enables direct drive of multiple TTL inputs or moderate PCB trace capacitance without external buffers.
CD74ACT139M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74ACT139M FAQ
1.How can I place an order for CD74ACT139M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT139M 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 CD74ACT139M reliable?
The price and inventory of CD74ACT139M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT139M is usually 5 days.
3.What payment methods are accepted for CD74ACT139M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT139M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT139M?
CD74ACT139M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT139M 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 CD74ACT139M?
For technical support, including CD74ACT139M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT139M requirements.
6.How does Aetrix verify that CD74ACT139M is sourced from the original manufacturer or authorized distributors?
All CD74ACT139M 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 CD74ACT139M meets industry standards.
7.What is the process for return or replacement of CD74ACT139M?
All CD74ACT139M units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT139M, 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 CD74ACT139M part is unused and in its original packaging.
Return procedure for CD74ACT139M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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