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Texas Instruments CD54ACT139F3A
- Part No.:
- CD54ACT139F3A
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
CD54ACT139F3A.pdf
- Description:
- CD54ACT139 DUAL 2-TO-4 LINE DECO
- Quantity:
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Inventory:1,225
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Product details
Overview
CD54ACT139F3A from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in a 16-pin CDIP package, rated for –55°C to 125°C operation, with 4.5 V–5.5 V supply range, ±24 mA output drive, and propagation delays as low as 2.9 ns (tPLH/tPHL) at 5 V. It serves in high-speed memory decoding and data routing where minimal system delay is critical.
For engineers reviewing the CD54ACT139F3A datasheet, CD54ACT139F3A pinout, CD54ACT139F3A application, or CD54ACT139F3A equivalent, this page delivers verified functional identity, military-grade temperature performance, dual-enable architecture, balanced noise immunity at 30% VCC, and direct substitution guidance for legacy ACT-family decoding systems.
Technical Context
The CD54ACT139F3A implements two independent TTL-compatible decoders, each with active-low enable (G), two select inputs (A, B), and four active-low outputs (Y0–Y3). Its CMOS ACT process delivers bipolar-speed timing with CMOS power efficiency and SCR-latchup resistance.
Each decoder features fully buffered inputs presenting only one normalized load, and supports cascading via shared or independent enable control. The device operates across full military temperature range without derating, maintaining VOH ≥ 3.7 V and VOL ≤ 0.5 V at IOL = 24 mA and TA = 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of nominal 5% rail variation. |
| Propagation Delay (tPLH/tPHL) | 2.9 ns min / 11.5 ns max at TA = –55°C to 125°C - enables sub-10 ns system decode paths in memory subsystems. |
| Output Drive | ±24 mA - drives 15 F-series TTL loads directly without buffering; supports terminated transmission lines. |
| Input Noise Immunity | 30% of VCC - ensures reliable switching under noisy industrial/military environments with >1.35 V noise margin at 4.5 V. |
| ESD Protection | ≥2 kV per MIL-STD-883 Method 3015 - meets military handling and board-level ESD robustness requirements. |
| Quiescent ICC | 8 µA typical at 5.5 V - ultra-low static power ideal for always-on decoding in battery-backed or low-power standby circuits. |
Pinout & Package
CD54ACT139F3A is housed in a 16-pin Ceramic Dual In-line Package (CDIP), hermetically sealed and qualified per MIL-PRF-38535 for high-reliability applications. Package drawing J, 0.300-inch wide body, 0.100-inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable input | Gate control for respective decoder; enables demultiplexing when used as data line (low = active). |
| 1A, 1B / 2A, 2B | Binary select inputs | Address bits selecting one of four active-low outputs (Y0–Y3); fully buffered, 1-unit load each. |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Asserted low per binary input combination; fanout to 15 F devices; ±24 mA drive capability. |
| VCC (Pin 16), GND (Pin 8) | Power supply terminals | Single 5-V supply; decoupling required per MIL-STD-806 for transient suppression in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Two fully isolated 2-to-4 decoding blocks sharing no internal logic-enables parallel address decoding or split data routing. |
| Balanced propagation delays | tPLH and tPHL match within 0.2 ns (min) - eliminates skew-induced glitches in synchronous memory enable paths. |
| SCR-latchup-resistant process | Qualified per MIL-PRF-38535 - prevents destructive latchup under overvoltage transients common in avionics and defense platforms. |
| Military temperature range | –55°C to +125°C operation without derating - supports deployment in engine bays, radar cabinets, and space-qualified electronics. |
| High-noise-immunity inputs | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V - rejects >1.35 V of common-mode noise on control lines. |
Applications
| Memory Address Decoding | High-Speed Data Demultiplexing |
|---|---|
|
Use Scenario: Selecting one of four memory banks in a 16-bit microprocessor system with cycle time < 50 ns. IC Role / Device Role / Timing Role: Primary address decoder enabling bank-select signals with < 12 ns worst-case delay, synchronized to CPU address valid. Use Value: Reduces effective memory access latency by ensuring decoder delay is less than memory enable time-no wait states added. |
Use Scenario: Routing a single serial data stream to one of four test instrumentation channels in automated test equipment. IC Role / Device Role / Timing Role: Demultiplexer using 1G/2G as channel-select strobes; A/B as static channel address. Use Value: Enables glitch-free channel switching at up to 80 MHz due to matched tPLH/tPHL and low-output skew. |
| Avionics Bus Interface Logic | Radar Signal Path Control |
|
Use Scenario: Enabling/disabling ARINC 429 receiver buffers based on mode selection in flight control computers. IC Role / Device Role / Timing Role: Dual-enable controlled gating of receive-enable signals; operates across full aircraft thermal envelope. Use Value: Guaranteed functionality at –55°C (cold soak) and +125°C (engine bay proximity) without thermal derating. |
Use Scenario: Controlling RF switch matrices in phased-array radar front-ends requiring precise timing alignment. IC Role / Device Role / Timing Role: Synchronized decoder driving multiple SPDT RF switches with sub-10 ns inter-output skew. Use Value: Maintains phase coherence across antenna elements by eliminating decode-induced timing jitter in control 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 |
|---|---|---|---|
| CD74ACT139M | SOIC-16 package; commercial/military temp range (–55°C to 125°C); same AC electrical specs and pinout. | Surface-mount assembly; lower thermal impedance (θJA = 73°C/W vs. CDIP's ~100°C/W); not hermetically sealed. | Select for PCB space-constrained or reflow-soldered designs where hermeticity is non-critical. |
| SN74ACT139N | PDIP-16; commercial temp only (–40°C to 85°C); identical logic function and AC specs but not MIL-qualified. | Cost-sensitive industrial controls; no requirement for extended temperature or radiation-hardened handling. | Select for non-military applications where full temperature range and QML certification are unnecessary. |
Compared with CD74ACT139M and SN74ACT139N, the CD54ACT139F3A provides hermetic CDIP packaging, MIL-PRF-38535 qualification, and guaranteed operation at –55°C and +125°C-making it the sole choice for deployed defense, aerospace, and downhole systems where reliability under extreme environmental stress is mandatory.
Availability
CD54ACT139F3A is available at Aetrix Electronics and suitable for high-reliability memory decoding, avionics bus interface, and radar signal path control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD54ACT139F3A 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 high-reliability logic solutions, with decades of heritage in military-grade IC development.
The CD54ACT139F3A belongs to TI's ACT (Advanced CMOS Technology) logic family-designed specifically for high-speed, low-power, noise-immune digital systems in defense, aerospace, and industrial infrastructure.
FAQ
What is the operating temperature range of the CD54ACT139F3A?
The CD54ACT139F3A is rated for continuous operation from –55°C to +125°C, fully specified across this range per MIL-PRF-38535. Electrical parameters including VOH, VOL, tPLH/tPHL, and ICC are guaranteed at both extremes without derating-making it suitable for engine-mounted, avionics, and space-qualified applications where ambient thermal stress is severe.
Is the CD54ACT139F3A pin-compatible with CD74ACT139E or CD74ACT139M?
Yes-the CD54ACT139F3A shares identical pinout, logic function, and DC/AC electrical specifications with CD74ACT139E (PDIP) and CD74ACT139M (SOIC), differing only in package type (CDIP), qualification level (MIL-PRF-38535), and thermal characteristics. No PCB layout change is needed when substituting among these variants for functional validation or qualification upgrades.
Does the CD54ACT139F3A support 3.3-V operation?
No-the CD54ACT139F3A is specified only for 4.5 V to 5.5 V supply operation per its recommended conditions. While some ACT devices tolerate wider voltage ranges, the datasheet explicitly defines VCC min = 4.5 V, and VIH/VIL thresholds assume 5-V logic levels. Operation below 4.5 V is not characterized or guaranteed.
How does the CD54ACT139F3A handle unused inputs?
All unused inputs on the CD54ACT139F3A must be tied to either VCC or GND to prevent floating nodes that could cause excessive ICC, oscillation, or ESD susceptibility. This requirement is mandated in TI's application report SCBA004 and applies to all unconnected A, B, or G pins-even if one decoder is unused, its inputs still require termination.
What is the maximum fanout capability of the CD54ACT139F3A?
The CD54ACT139F3A drives up to 15 F-series TTL loads per output, confirmed by its ±24 mA output current rating and 1-unit load input structure. This fanout capacity is maintained across the full –55°C to +125°C range and enables direct interfacing with legacy TTL memory controllers, bus transceivers, and peripheral decoders without intermediate buffers.
CD54ACT139F3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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CD54ACT139F3A FAQ
1.How can I place an order for CD54ACT139F3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54ACT139F3A 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 CD54ACT139F3A reliable?
The price and inventory of CD54ACT139F3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54ACT139F3A is usually 5 days.
3.What payment methods are accepted for CD54ACT139F3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54ACT139F3A transactions.
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4.How is shipping managed for CD54ACT139F3A?
CD54ACT139F3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54ACT139F3A 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 CD54ACT139F3A?
For technical support, including CD54ACT139F3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54ACT139F3A requirements.
6.How does Aetrix verify that CD54ACT139F3A is sourced from the original manufacturer or authorized distributors?
All CD54ACT139F3A 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 CD54ACT139F3A meets industry standards.
7.What is the process for return or replacement of CD54ACT139F3A?
All CD54ACT139F3A units undergo pre-shipment inspection (PSI). If there is an issue with CD54ACT139F3A, 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 CD54ACT139F3A part is unused and in its original packaging.
Return procedure for CD54ACT139F3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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