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Texas Instruments CD54HC139F
- Part No.:
- CD54HC139F
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HC139F.pdf
- Description:
- HIGH SPEED CMOS LOGIC DUAL 2-TO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,938
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Product details
Overview
CD54HC139F from Texas Instruments is a military-grade dual 2-to-4 line decoder/demultiplexer in CERDIP packaging, operating from 2V to 6V with -55°C to +125°C temperature range. It features active-low mutually exclusive outputs, 10 LSTTL load fanout, and propagation delays as low as 25 ns at 6V. It is used in high-reliability memory decoding and data routing within aerospace and defense systems.
For engineers reviewing the CD54HC139F datasheet, CD54HC139F pinout, CD54HC139F application, or CD54HC139F equivalent, key selection criteria include its CERDIP package for hermetic reliability, dual independent enable-controlled decoding paths, guaranteed operation across extreme temperatures, and compatibility with both HC-level input thresholds and TTL-compatible loads.
Technical Context
The CD54HC139F implements two fully independent binary-to-1-of-4 decoders, each with a dedicated active-low enable (1E, 2E) and select inputs (A0/A1). Each decoder drives four active-low outputs (Y0–Y3), all held high when the respective enable is high.
Its logic function supports both decoder mode (select-driven output activation) and demultiplexer mode (enable as data input), with cascading enabled via inter-device enable chaining. The device is functionally identical to CD4556B and pin compatible with it.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HC-type CMOS: 2V–6V supply, high noise immunity (NIL/NIH = 30% of VCC at 5V) |
| Operating Temperature | -55°C to +125°C: qualified for military and harsh-environment applications |
| Propagation Delay | 25 ns max (A0/A1 to Y, 6V, CL = 50 pF): enables high-speed address decoding in real-time systems |
| Fanout Capability | 10 LSTTL loads per output: sufficient drive strength for legacy TTL bus interfacing without buffers |
| Output Configuration | Active-low, mutually exclusive outputs: ensures only one Yx asserted per decoder, preventing bus contention |
| Quiescent Current | 160 µA max (–55°C to +125°C, VCC = 6V): ultra-low static power for battery- or thermal-constrained designs |
| Input Leakage | ±1 µA max (–55°C to +125°C): minimal loading on upstream drivers or high-impedance control lines |
Pinout & Package
CD54HC139F uses a 16-lead CERDIP (Ceramic Dual In-line Package) with hermetic sealing, rated for military temperature range and long-term reliability in mission-critical systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1E, 2E | Active-low enable inputs | Enable/disable entire decoder section; high = all outputs forced high; used as chip select or data input in demux mode |
| 1A0, 1A1 / 2A0, 2A1 | Binary select inputs | Two-bit address determining which of four outputs (Y0–Y3) goes low per decoder |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Four mutually exclusive outputs per decoder; only one low per active decoder; no bus contention risk |
| VCC | Positive supply | 2V–6V operation; supports mixed-voltage system integration and low-power modes |
| GND | Ground reference | Common return path; CERDIP package provides stable thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables simultaneous decoding of two separate 2-bit addresses-e.g., memory bank + peripheral select-without external gating |
| Wide voltage operation (2V–6V) | Supports direct interface with 3.3V microcontrollers, 5V legacy systems, and low-power 2V sensor interfaces |
| Hermetic CERDIP packaging | Guarantees long-term reliability under thermal cycling, humidity, and radiation exposure in aerospace platforms |
| Pin compatibility with CD4556B | Allows drop-in replacement in existing designs using that legacy CMOS decoder, reducing redesign effort |
| Low dynamic power (CPD = 55 pF) | Reduces switching current and heat generation in high-frequency address decoding applications |
Applications
| Aerospace Avionics Bus Decoding | Military Radar Signal Routing |
|---|---|
Use Scenario: Selecting among multiple sensor data channels or memory banks in a flight control computer. IC Role / Device Role / Timing Role: Dual decoder routes CPU address lines to discrete memory or I/O modules; enables fast, deterministic access with <25 ns latency. Use Value: Guaranteed operation across -55°C to +125°C eliminates thermal derating and simplifies thermal management in sealed avionics enclosures. | Use Scenario: Distributing timing or control signals across phased-array radar subsystems. IC Role / Device Role / Timing Role: Demultiplexer mode routes master clock or trigger pulses to four independent receiver chains with precise edge alignment. Use Value: Active-low mutually exclusive outputs prevent signal contention during rapid beam steering sequences. |
| Secure Communication Module Addressing | Hardened Industrial PLC I/O Expansion |
Use Scenario: Enabling cryptographic co-processor registers or secure boot memory segments based on command opcode. IC Role / Device Role / Timing Role: Decoder interprets 2-bit instruction field to activate one of four hardened memory regions; enable tied to security state flag. Use Value: CERDIP package resists tampering and environmental stress, supporting TEMPEST-compliant hardware design. | Use Scenario: Expanding digital input/output capacity in explosion-proof programmable logic controllers deployed in oil refineries. IC Role / Device Role / Timing Role: Translates controller address bus into discrete module enables for isolated I/O cards operating in hazardous zones. Use Value: 10 LSTTL fanout drives opto-isolator inputs directly; wide temperature range avoids external heaters or coolers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 2-to-4 line decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD54HCT139F3A | LSTTL-input compatible (VIH ≥ 2V, VIL ≤ 0.8V); 4.5V–5.5V only; higher ICC at temperature extremes | Required where interfacing with legacy 5V TTL logic families without level shifters | Select when strict LSTTL input threshold compliance is mandatory; not suitable for 2V–4.4V or 5.6V–6V operation |
| CD4556B | Same pinout and function; older CD4000-series CMOS; slower (100+ ns typical delay); wider VDD range (3V–18V) | Used in legacy high-voltage industrial controls where speed is secondary to voltage flexibility | Choose only for backward compatibility; CD54HC139F offers 4× faster propagation and lower power at 5V |
Compared with CD54HCT139F3A, CD54HC139F supports broader supply voltage and lower static current but lacks native TTL input compatibility; compared with CD4556B, it delivers significantly improved speed and noise immunity while maintaining pin-for-pin replaceability in CERDIP layouts.
Availability
CD54HC139F is available at Aetrix Electronics and suitable for aerospace avionics, military radar subsystems, and hardened industrial PLCs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD54HC139F 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 for industrial, automotive, and defense markets.
The CD54HC139F belongs to TI's military-qualified HC logic family, designed specifically for high-integrity decoding and signal routing in systems where extended temperature operation, hermetic packaging, and long-term supply assurance are critical.
FAQ
What is the maximum supply voltage rating for CD54HC139F?
The absolute maximum DC supply voltage for CD54HC139F is 7V, but the recommended operating range is 2V to 6V. Operation above 6V risks exceeding safe power dissipation limits and may degrade long-term reliability-even within the absolute maximum rating, sustained use beyond 6V is not supported by TI's characterization data or qualification testing for this military-grade part.
Does CD54HC139F support demultiplexer functionality?
Yes, CD54HC139F supports demultiplexer operation: the active-low enable input (1E or 2E) serves as the data input, while the A0/A1 select lines determine which of the four outputs (Y0–Y3) reflects the inverted enable state. This allows single-bit data distribution across four paths with precise timing control and mutual exclusivity.
Is CD54HC139F pin compatible with CD74HC139E?
No-CD54HC139F uses a 16-lead CERDIP package, while CD74HC139E uses a 16-lead PDIP package. Although both share identical pin functions and numbering, their physical footprints, thermal characteristics, and reliability profiles differ significantly. PCB layout, soldering profile, and mechanical mounting are not interchangeable between these packages.
What is the fanout capability of CD54HC139F outputs?
CD54HC139F outputs can drive up to 10 LSTTL loads over the full -55°C to +125°C temperature range. This is verified under worst-case conditions (low VCC, high temperature) and ensures reliable interfacing with legacy TTL devices without external buffering in high-reliability systems.
Can CD54HC139F be used in place of CD4556B?
Yes-CD54HC139F is functionally identical and pin compatible with CD4556B in CERDIP packaging. It offers superior performance: propagation delay reduced from >100 ns to 25 ns at 6V, quiescent current lowered by >50%, and improved noise immunity. No PCB changes are required for replacement, provided the system operates within the 2V–6V supply range.
CD54HC139F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
CD54HC139F FAQ
1.How can I place an order for CD54HC139F through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HC139F 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 CD54HC139F reliable?
The price and inventory of CD54HC139F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HC139F is usually 5 days.
3.What payment methods are accepted for CD54HC139F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HC139F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HC139F?
CD54HC139F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HC139F 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 CD54HC139F?
For technical support, including CD54HC139F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HC139F requirements.
6.How does Aetrix verify that CD54HC139F is sourced from the original manufacturer or authorized distributors?
All CD54HC139F 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 CD54HC139F meets industry standards.
7.What is the process for return or replacement of CD54HC139F?
All CD54HC139F units undergo pre-shipment inspection (PSI). If there is an issue with CD54HC139F, 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 CD54HC139F part is unused and in its original packaging.
Return procedure for CD54HC139F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD54HC139F Tags
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SN74HC138DR
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TCA9546APWR
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SN74HC138N
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