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Texas Instruments CD54HCT139F3A
- Part No.:
- CD54HCT139F3A
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HCT139F3A.pdf
- Description:
- HIGH SPEED CMOS LOGIC DUAL 2-TO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,400
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Product details
Overview
CD54HCT139F3A from Texas Instruments is a military-grade dual 2-to-4 line decoder/demultiplexer with active-low mutually exclusive outputs, 4.5V–5.5V supply operation, -55°C to +125°C temperature range, and direct LSTTL input compatibility (VIL ≤ 0.8 V, VIH ≥ 2.0 V). It serves in high-reliability memory decoding and data routing within aerospace and defense systems.
For engineers reviewing the CD54HCT139F3A datasheet, CD54HCT139F3A pinout, CD54HCT139F3A application, or CD54HCT139F3A equivalent, key selection criteria include its CERDIP package, HCT logic family compatibility with LS TTL, guaranteed propagation delay ≤ 51 ns at 4.5 V, and dual independent enable-controlled decoding paths.
Technical Context
The CD54HCT139F3A implements two fully independent binary-to-1-of-4 decoders, each with a dedicated active-low enable input (1E, 2E) and select inputs (1A0/1A1, 2A0/2A1). Outputs are active-low and mutually exclusive: only one of Y0–Y3 per section goes low per valid input combination.
It operates strictly within 4.5 V–5.5 V, ensuring LSTTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and CMOS-level output drive (VOH ≥ 4.4 V, VOL ≤ 0.4 V at 4 mA). Its CERDIP package supports hermetic sealing for extended reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - compatible with LS TTL inputs and drives standard LSTTL loads (10 per output) |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures stable operation across military-grade power rails |
| Operating Temperature | -55°C to +125°C - qualified for extended-range military and aerospace applications |
| Propagation Delay | ≤ 51 ns (max, -55°C to +125°C, CL = 50 pF) - deterministic timing for synchronous decoding |
| Input Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - guarantees robust noise margin with legacy TTL sources |
| Output Drive | ±4 mA (min) at VOH/VOL - sufficient to directly interface with 74LS-series inputs without buffering |
| Package Type | 16-lead CERDIP (J package) - hermetically sealed ceramic for moisture resistance and thermal stability |
Pinout & Package
CD54HCT139F3A uses a 16-lead CERDIP (ceramic dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner when viewed from the top with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1E | Section 1 Enable Input | Active-low chip select for first decoder; enables Y0–Y3 when low |
| 1A0, 1A1 | Section 1 Address Inputs | Binary select lines determining which of Y0–Y3 goes low (active-low outputs) |
| 1Y0–1Y3 | Section 1 Outputs | Active-low decoded outputs; only one low per valid A0/A1 combination |
| 2E | Section 2 Enable Input | Independent active-low enable for second decoder; supports cascading |
| 2A0, 2A1 | Section 2 Address Inputs | Binary select lines for second decoder, electrically isolated from Section 1 |
| 2Y0–2Y3 | Section 2 Outputs | Active-low outputs mirroring Section 1 behavior; no crosstalk between sections |
| VCC | Positive Supply | 4.5 V–5.5 V connection; must be decoupled locally for noise immunity |
| GND | Ground Reference | Common return path for all inputs, outputs, and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Two functionally isolated 2-to-4 decoding paths enable parallel address decoding or split-channel demux |
| Active-low mutually exclusive outputs | Guarantees only one output low per section, eliminating bus contention in memory enable schemes |
| LSTTL input compatibility | Accepts standard TTL logic levels without level-shifting, simplifying integration into legacy digital systems |
| Military temperature qualification | Rated for -55°C to +125°C operation, meeting MIL-PRF-38535 requirements for high-reliability platforms |
| CERDIP hermetic packaging | Provides superior moisture resistance, thermal cycling endurance, and long-term reliability vs. plastic packages |
Applications
| Memory Address Decoding | Aerospace Avionics Bus Routing |
|---|---|
Use Scenario: Selecting one of four memory banks in a radiation-tolerant flight computer using a 2-bit address bus. IC Role / Device Role / Timing Role: Dual decoder provides independent chip-select signals for SRAM, PROM, EEPROM, and I/O register banks. Use Value: Active-low outputs directly drive memory CE# pins; mutual exclusivity prevents simultaneous bank activation and data corruption. |
Use Scenario: Routing sensor data streams from multiple analog front-ends to a central ADC controller in a satellite payload. IC Role / Device Role / Timing Role: Functions as a demultiplexer where 2E/1E serve as channel-enable controls synchronized to system clock edges. Use Value: Guaranteed 51 ns max propagation delay ensures deterministic signal routing timing across temperature extremes. |
| Defense Radar Signal Conditioning | Secure Communication Module Control |
Use Scenario: Enabling discrete filter banks or gain stages in an S-band radar receiver under programmable FPGA control. IC Role / Device Role / Timing Role: Decoder interprets FPGA-configured mode bits to activate specific RF path components via active-low enables. Use Value: CERDIP package withstands thermal shock during rapid radar duty-cycle transitions and meets MIL-STD-883 screening. |
Use Scenario: Controlling encryption engine selection, key storage access, and tamper-detection peripheral enables in a crypto module. IC Role / Device Role / Timing Role: Provides secure, glitch-free enable sequencing for critical subsystems using independent 1E/2E control. Use Value: LSTTL-compatible inputs interface directly with FPGA I/O banks; wide temp range supports conduction-cooled chassis designs. |
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 |
|---|---|---|---|
| CD54HC139F3A | HC family: 2V–6V supply, VIH/VIL referenced to VCC (not fixed TTL thresholds); higher noise immunity but not LSTTL-input compatible | Suitable for mixed-voltage systems where TTL interfacing is unnecessary; not drop-in for LS-driven designs | Select only if system uses CMOS-level control signals and requires wider VCC flexibility |
| CD4556BM96 | CMOS (4000B series): 3V–18V supply, different pinout (16-pin DIP), non-LSTTL-compatible inputs, slower propagation (≥ 120 ns at 5 V) | Used in legacy industrial controllers with wide-supply tolerance; lacks HCT's timing precision and TTL interoperability | Consider only for cost-sensitive, non-military retrofits where timing and input compatibility are secondary |
Compared with CD54HC139F3A, the CD54HCT139F3A ensures seamless integration into existing LS TTL infrastructure without level shifters; versus CD4556BM96, it delivers 2.3× faster decoding with guaranteed military temperature performance and pin-defined enable logic.
Availability
CD54HCT139F3A is available at Aetrix Electronics and suitable for aerospace avionics, defense radar subsystems, and secure communication modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD54HCT139F3A 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 over 50 years of space-qualified component heritage.
The CD54HCT139F3A belongs to TI's military-grade HCT logic family, designed specifically for high-integrity digital control, memory expansion, and signal routing in defense, aerospace, and industrial systems demanding extended temperature operation and hermetic packaging.
FAQ
What is the maximum propagation delay of the CD54HCT139F3A across its full operating temperature range?
The CD54HCT139F3A has a maximum propagation delay of 51 ns (tPLH/tPHL) from enable or select inputs to outputs, specified at VCC = 4.5 V, CL = 50 pF, and over the full -55°C to +125°C temperature range. This value is guaranteed in the datasheet's switching specifications table and applies to both decoder sections under worst-case conditions.
Does the CD54HCT139F3A support direct connection to standard 74LS-series logic outputs?
Yes, the CD54HCT139F3A supports direct connection to 74LS-series outputs because its HCT input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V) match LS TTL voltage levels. No level-shifting circuitry is required, enabling plug-compatible integration into legacy TTL-based systems.
What package type and mounting style does the CD54HCT139F3A use?
The CD54HCT139F3A uses a 16-lead CERDIP (ceramic dual in-line package) with through-hole mounting. It features a 0.3-inch body width, hermetic ceramic construction, and SNPB (tin-lead) lead finish. This package is qualified for military applications per MIL-PRF-38535 and supports wave or hand soldering.
Can the CD54HCT139F3A be used as a 1-to-4 demultiplexer, and how is data routed?
Yes, the CD54HCT139F3A can operate as a 1-to-4 demultiplexer: the active-low enable input (1E or 2E) serves as the data input, while A0 and A1 determine the destination output (Y0–Y3). When E is low, the selected Yx goes low; all outputs remain high when E is high - enabling clean, glitch-free signal distribution.
Is the CD54HCT139F3A pin-compatible with the CD4556B, and what does that mean for design reuse?
Yes, the CD54HCT139F3A is pin-compatible with the CD4556B as confirmed in the functional description: "This device is functionally the same as the CD4556B and is pin compatible with it." That means identical PCB footprint and interconnect - but CD54HCT139F3A offers faster speed, tighter timing specs, and HCT-level TTL compatibility versus the slower 4000B-series CMOS device.
CD54HCT139F3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HCT
- 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:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
CD54HCT139F3A FAQ
1.How can I place an order for CD54HCT139F3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HCT139F3A 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 CD54HCT139F3A reliable?
The price and inventory of CD54HCT139F3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HCT139F3A is usually 5 days.
3.What payment methods are accepted for CD54HCT139F3A?
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4.How is shipping managed for CD54HCT139F3A?
CD54HCT139F3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HCT139F3A 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 CD54HCT139F3A?
For technical support, including CD54HCT139F3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HCT139F3A requirements.
6.How does Aetrix verify that CD54HCT139F3A is sourced from the original manufacturer or authorized distributors?
All CD54HCT139F3A 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 CD54HCT139F3A meets industry standards.
7.What is the process for return or replacement of CD54HCT139F3A?
All CD54HCT139F3A units undergo pre-shipment inspection (PSI). If there is an issue with CD54HCT139F3A, 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 CD54HCT139F3A part is unused and in its original packaging.
Return procedure for CD54HCT139F3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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