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Texas Instruments CD54HCT139F
- Part No.:
- CD54HCT139F
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
CD54HCT139F.pdf
- Description:
- CD54HCT139 HIGH SPEED CMOS LOGIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,475
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Product details
Overview
CD54HCT139F from Texas Instruments is a military-grade dual 2-to-4 line decoder/demultiplexer in 16-lead CERDIP package, operating from 4.5V to 5.5V, featuring active-low mutually exclusive outputs, -55°C to +125°C temperature range, and LSTTL-compatible inputs (VIL ≤ 0.8V, VIH ≥ 2.0V). It enables memory decoding and data routing in high-reliability aerospace and defense systems.
For engineers reviewing the CD54HCT139F datasheet, CD54HCT139F pinout, CD54HCT139F application, or CD54HCT139F equivalent, this page delivers verified electrical specs, truth-table–aligned logic behavior, CERDIP package mechanical details, and functionally validated alternatives for radiation-tolerant or extended-temperature digital control designs.
Technical Context
The CD54HCT139F integrates two independent decoders, each with one active-low enable (1E/2E) and two binary select inputs (A0/A1), driving four active-low outputs (Y0–Y3) per section. Outputs are mutually exclusive and high-impedance when enabled is high.
It implements HCT logic architecture: TTL-level input thresholds ensure direct compatibility with LS-family sources, while CMOS output stages deliver 10 LSTTL load fanout and rail-to-rail switching. Propagation delay is 34 ns (max, -55°C to +125°C, CL = 50 pF) from select or enable to any output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS outputs, 4.5V–5.5V supply only |
| Operating Temperature | -55°C to +125°C - Qualified for military and space-grade environmental stress screening |
| Propagation Delay | 51 ns max (A0/A1 or E to Yx, -55°C to +125°C, CL = 50 pF) - Enables synchronous timing in real-time control loops |
| Output Drive | 10 LSTTL loads - Sufficient to drive legacy TTL bus loads without buffering |
| Input Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) at VCC = 5 V - Guarantees noise-immune interfacing with 74LS-series sources |
| Quiescent ICC | 160 µA max (-55°C to +125°C) - Supports low-static-power operation in battery-backed subsystems |
| Power Dissipation Cap. | 59 pF - Used with CPD formula to calculate dynamic power at known toggle frequency and load capacitance |
Pinout & Package
CD54HCT139F uses a 16-lead CERDIP (Ceramic Dual In-line Package) with 0.3-inch body width, hermetically sealed for moisture resistance and long-term reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1E, 2E | Active-Low Enable Inputs | Enable respective decoder section; high = all outputs forced high (disabled state) |
| 1A0, 1A1 / 2A0, 2A1 | Binary Select Inputs | Address bits selecting one of four active-low outputs per section (Y0–Y3) |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-Low Decoder Outputs | Only one output per section goes low per valid A0/A1 combination; outputs are mutually exclusive |
| VCC (Pin 16), GND (Pin 8) | Power Supply Terminals | Single 4.5–5.5 V supply; no separate ground plane required for dual-section operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables two parallel 2-to-4 decode paths on single die - reduces board area vs. discrete solutions |
| Active-low mutually exclusive outputs | Eliminates bus contention in memory chip-select or peripheral enable applications |
| LSTTL input compatibility | Direct interface with legacy 74LS logic without level-shifting - critical for system upgrades |
| Wide temperature operation | Validated performance across full military range (-55°C to +125°C) - no derating needed |
| Low quiescent current | ≤160 µA max ensures minimal standby power draw in always-on avionics modules |
Applications
| Aerospace Vehicle Control | Military Data Acquisition Systems |
|---|---|
|
Use Scenario: Selecting among four analog-to-digital converter channels in a flight control sensor hub. IC Role / Device Role / Timing Role: Dual decoder acts as channel selector: one section routes clock enable, the other selects ADC chip-select lines. Use Value: Mutual exclusivity prevents simultaneous ADC activation; CERDIP packaging withstands vibration and thermal cycling in airframe mounts. |
Use Scenario: Address decoding for four PROM-based firmware banks in an encrypted comms processor. IC Role / Device Role / Timing Role: Each decoder section maps 2-bit address to one PROM enable line; enables secure boot path selection. Use Value: LSTTL-compatible inputs accept signals directly from microcontroller GPIO; wide temperature range supports desert/high-altitude deployment. |
| Spacecraft Telemetry Interface | Ruggedized Industrial PLC I/O Expansion |
|
Use Scenario: Routing telemetry packet headers to four redundant downlink transmitters based on priority flags. IC Role / Device Role / Timing Role: Demultiplexer mode: enable pins serve as data inputs; select lines route header bits to transmitter enable lines. Use Value: 51 ns max propagation delay meets sub-microsecond arbitration timing; hermetic CERDIP prevents outgassing in vacuum. |
Use Scenario: Expanding discrete output capability of a DIN-rail mounted controller to drive four solenoid valves. IC Role / Device Role / Timing Role: Decoder converts 2-bit PLC output word into individual valve enable signals with glitch-free transitions. Use Value: 10 LSTTL fanout drives valve driver ICs directly; -55°C rating supports arctic oilfield installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 2-to-4 decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD54HC139F | HC logic family: 2V–6V supply, higher VIH/VIL thresholds (VIH ≥ 1.5V @ 2V), lower drive (10 LSTTL), wider VCC range | Used where mixed-voltage systems exist or where lower static power is prioritized over TTL compatibility | Select CD54HC139F only if interfacing with non-TTL sources and supply voltage may drop below 4.5V. |
| CD4556B | CMOS (4000-series): 3V–18V supply, higher propagation delay (120 ns min @ 5V), pin-compatible but not logic-equivalent at speed | Legacy designs requiring backward compatibility with older 4000B-series layouts and relaxed timing budgets | CD4556B requires layout verification for timing closure; not suitable for systems needing <60 ns decode latency. |
Compared with CD54HC139F and CD4556B, the CD54HCT139F uniquely balances LSTTL input compatibility, military temperature range, and sub-60 ns propagation - making it the only choice for upgrading legacy LS-based systems to radiation-hardened platforms without redesigning interface logic.
Availability
CD54HCT139F is available at Aetrix Electronics and suitable for aerospace vehicle control, military data acquisition, spacecraft telemetry interface, and ruggedized industrial PLC I/O expansion requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for CD54HCT139F 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-qualified components.
The CD54HCT139F belongs to TI's CD54HCT logic family - designed specifically for high-reliability applications demanding guaranteed operation across -55°C to +125°C, including defense electronics, avionics, and space systems.
FAQ
What is the supply voltage range for CD54HCT139F?
The CD54HCT139F operates strictly within 4.5 V to 5.5 V. Unlike HC variants, it does not support 2 V or 6 V supplies. This narrow range ensures precise TTL-level input compatibility and stable output drive under military-grade voltage tolerances. Operating outside this window risks undefined logic states or accelerated parametric drift in CD54HCT139F.
Is CD54HCT139F pin-compatible with CD4556B?
Yes, CD54HCT139F is pin-compatible with CD4556B per the datasheet: both use identical 16-pin CERDIP pinout and terminal assignments. However, CD54HCT139F offers faster propagation (51 ns vs. 120 ns min), lower input current, and tighter input thresholds - requiring validation of timing margins if replacing CD4556B in existing designs.
Does CD54HCT139F support demultiplexer operation?
Yes, CD54HCT139F supports demultiplexer operation: the enable input (1E or 2E) serves as the data input, while A0/A1 select which of the four outputs passes the signal. When used this way, CD54HCT139F routes a single active-low data stream to one of four destinations with mutual exclusivity and no external gating.
What is the maximum fanout for CD54HCT139F outputs?
The CD54HCT139F outputs drive up to 10 LSTTL loads under all temperature conditions (-55°C to +125°C). This is confirmed by the "Fanout (Over Temperature Range)" specification in the Harris datasheet. Exceeding this load count risks marginal VOH/VOL levels and increased propagation delay in CD54HCT139F.
How does CD54HCT139F differ from CD74HCT139M?
CD54HCT139F is the military-grade CERDIP version rated for -55°C to +125°C with hermetic sealing, while CD74HCT139M is the commercial SOIC variant rated for -55°C to +125°C but non-hermetic and not QML-qualified. Both share identical logic, timing, and DC specs, but CD54HCT139F undergoes additional screening for radiation tolerance and mechanical robustness - essential for CD54HCT139F deployments in defense systems.
CD54HCT139F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HCT
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CD54HCT139F FAQ
1.How can I place an order for CD54HCT139F through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HCT139F 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 CD54HCT139F reliable?
The price and inventory of CD54HCT139F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HCT139F is usually 5 days.
3.What payment methods are accepted for CD54HCT139F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HCT139F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HCT139F?
CD54HCT139F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HCT139F 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 CD54HCT139F?
For technical support, including CD54HCT139F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HCT139F requirements.
6.How does Aetrix verify that CD54HCT139F is sourced from the original manufacturer or authorized distributors?
All CD54HCT139F 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 CD54HCT139F meets industry standards.
7.What is the process for return or replacement of CD54HCT139F?
All CD54HCT139F units undergo pre-shipment inspection (PSI). If there is an issue with CD54HCT139F, 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 CD54HCT139F part is unused and in its original packaging.
Return procedure for CD54HCT139F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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