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Texas Instruments CD74HCT139E
- Part No.:
- CD74HCT139E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT139E.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:485
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Product details
Overview
CD74HCT139E from Texas Instruments is a dual 2-to-4 line decoder/demultiplexer IC with active-low enable and mutually exclusive active-low outputs, operating at 4.5V to 5.5V, supporting LSTTL-compatible inputs (VIL ≤ 0.8V, VIH ≥ 2V), and rated for -55°C to +125°C industrial/military temperature range - used in memory decoding, data routing, and code conversion circuits.
For engineers reviewing the CD74HCT139E datasheet, CD74HCT139E pinout, CD74HCT139E application, or CD74HCT139E equivalent, this page delivers verified functional identity, validated 16-pin PDIP package mapping, confirmed propagation delays (≤51 ns @ 5V), true HCT-level input compatibility, and two field-validated alternative parts with documented technical and application differences.
Technical Context
The CD74HCT139E integrates two independent binary decoders, each with one active-low enable (1E/2E) and two select inputs (A0/A1), driving four active-low outputs (Y0–Y3) that are mutually exclusive and high-impedance when enabled is inactive. It functions as either a decoder or demultiplexer depending on whether select lines or enable serve as data path.
Its HCT logic family ensures direct interface with legacy LSTTL outputs while maintaining CMOS power efficiency; input leakage stays ≤1 µA, quiescent ICC ≤160 µA over full temperature range, and output drive capability supports 10 LSTTL loads with VOH ≥3.7 V and VOL ≤0.4 V under TTL loading conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - enables direct LSTTL input compatibility without level shifters |
| Supply Voltage Range | 4.5V to 5.5V - matches standard 5V TTL bus systems |
| Propagation Delay | ≤51 ns (max, -55°C to +125°C, CL = 50 pF) - ensures timing predictability in synchronous control logic |
| Output Drive | 10 LSTTL loads - sufficient for driving multiple downstream TTL gates or LEDs with current limiting |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, defense, and under-hood automotive applications |
| Input Compatibility | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - guarantees reliable recognition of TTL logic levels |
| Power Dissipation | CPD = 59 pF - enables accurate dynamic power estimation using PD = VCC² × fi × (CPD + CL) |
Pinout & Package
CD74HCT139E is housed in a 16-lead plastic dual in-line package (PDIP, N package), with 0.3-inch body width and standard through-hole mounting footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1E, 2E | Active-low enable inputs | Enable/disable respective decoder section; high = all outputs forced high |
| 1A0, 1A1 / 2A0, 2A1 | Binary select inputs | Determine which of four outputs goes low (00→Y0, 01→Y1, etc.) |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Mutually exclusive low-state outputs; high-impedance only when enable is high |
| VCC | Positive supply | 4.5V–5.5V CMOS supply rail; must be decoupled locally |
| GND | Ground reference | Common return for all inputs, outputs, and supply |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables two separate 2-to-4 decode paths on single chip - reduces board space vs discrete solutions |
| Active-low mutual exclusivity | Only one Yx output active low per decoder at any time - prevents bus contention in address decoding |
| LSTTL input compatibility | No external level-shifting required when interfacing with 74LS-series outputs - simplifies mixed-logic designs |
| Wide temperature operation | Validated performance from -55°C to +125°C - eliminates derating concerns in harsh environments |
| Low quiescent current | ICC ≤ 160 µA max across full temp range - supports low-power standby modes in battery-backed systems |
Applications
| Memory Address Decoding | Data Routing in Control Logic |
|---|---|
Use Scenario: Selecting one of four memory banks or peripheral devices using 2-bit address lines and chip-select strobe. IC Role / Device Role / Timing Role: Decoder translates A0/A1 and CS# into individual active-low chip enables (Y0–Y3) for parallel memory mapping. Use Value: Eliminates need for discrete NAND gates; ensures glitch-free selection via guaranteed mutual exclusivity and sub-51 ns delay. | Use Scenario: Directing serial command bits to one of four function blocks (e.g., ADC channel select, DAC output routing). IC Role / Device Role / Timing Role: Demultiplexer uses enable pin as data input and A0/A1 as selector - routes single stream to one of four destinations. Use Value: Reduces signal fanout complexity; maintains timing integrity with matched tPLH/tPHL and <22 ns transition times. |
| Code Conversion Interface | Industrial I/O Expansion |
Use Scenario: Converting 2-bit BCD or binary control codes into discrete enable signals for relay drivers or LED indicators. IC Role / Device Role / Timing Role: Binary-to-one-of-four translation with active-low outputs directly sinking LED anodes or relay coil returns. Use Value: Supports direct drive of 10 LSTTL loads - accommodates up to 10 mA per output without external buffers. | Use Scenario: Expanding microcontroller GPIO by decoding two port pins into four independent control lines for sensors or actuators. IC Role / Device Role / Timing Role: Offloads bit-manipulation overhead from MCU firmware; provides hardware-based address resolution. Use Value: Enables deterministic response within 51 ns - critical for real-time PLC scan cycles and safety interlock sequencing. |
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 |
|---|---|---|---|
| SN74HCT139N | Same HCT logic family, identical pinout, same 4.5–5.5 V range and -55°C to +125°C rating; TI second-source with identical AC/DC specs | No functional or layout change required; fully interchangeable in existing PDIP designs | Select when seeking TI's current-production version with extended lifecycle support and RoHS-compliant NIPDAU finish |
| CD4556BM96 | CMOS (not HCT); operates at 3–18 V; higher propagation delay (≤120 ns @ 5 V); not LSTTL-input compatible | Suitable only in wide-VCC or low-speed systems; requires level-shifting for TTL inputs; incompatible with fast 5V bus timing | Choose only for legacy 4000-series designs or multi-supply systems where voltage flexibility outweighs speed and interface compatibility |
Compared with CD74HCT139E, SN74HCT139N offers identical electrical behavior and drop-in replacement assurance, while CD4556BM96 trades speed and TTL compatibility for broader supply range - making CD74HCT139E optimal for deterministic 5V control logic requiring LSTTL interoperability.
Availability
CD74HCT139E is available at Aetrix Electronics and suitable for memory decoding, industrial I/O expansion, code conversion interfaces, and data routing in control logic requiring stable component supply across extended temperature ranges.
Supply support for CD74HCT139E 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 company delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
CD74HCT139E belongs to TI's High-Speed CMOS Logic (HCT) product line, engineered to bridge legacy TTL systems with modern CMOS efficiency - specifically targeting robust, pin-compatible replacements for 74LS139 in mission-critical decoding and demux applications.
FAQ
What is the maximum propagation delay of CD74HCT139E across its full operating temperature range?
The maximum propagation delay for CD74HCT139E is 51 ns, measured from enable or select inputs to any output under worst-case conditions (-55°C to +125°C, VCC = 4.5 V, CL = 50 pF). This value applies uniformly to both decoder sections and is specified in the official TI datasheet SCHS148D, ensuring timing predictability in high-reliability control systems.
Can CD74HCT139E directly interface with 74LS-series logic outputs without level shifting?
Yes, CD74HCT139E features LSTTL-compatible inputs with VIH ≥ 2.0 V (min) and VIL ≤ 0.8 V (max) at VCC = 4.5–5.5 V, allowing direct connection to 74LS gate outputs. Its input thresholds match LS-family specifications, eliminating the need for external resistors or translators in mixed-logic 5V systems - a key design advantage confirmed in TI's HCT family documentation.
What package type and lead finish does CD74HCT139E use?
CD74HCT139E uses a 16-lead plastic dual in-line package (PDIP, package code N) with NiPdAu (NIPDAU) lead finish. It is RoHS-compliant, supplied in tubes of 25 units, and rated for solder reflow per JEDEC J-STD-020 (MSL not applicable for PDIP). The physical dimensions - 506 mm length, 13.97 mm width - are standardized for through-hole assembly.
Does CD74HCT139E support demultiplexer functionality, and how is it configured?
Yes, CD74HCT139E supports demultiplexer operation: the active-low enable pin (1E or 2E) serves as the data input, while A0/A1 act as select lines. When enabled is low, the selected Yx output mirrors the enable state (i.e., low); all others remain high. This configuration is explicitly defined in the truth table and functional description of the CD74HCT139E datasheet, enabling single-line-to-four-line signal distribution.
Is CD74HCT139E suitable for automotive under-hood applications?
Yes, CD74HCT139E is qualified for -55°C to +125°C operation and meets TI's enhanced reliability standards for extended temperature applications. Its HCT logic family, robust ESD protection, and validated performance across the full range make it suitable for automotive under-hood control modules - provided system-level thermal management maintains junction temperature below 150°C, as specified in absolute maximum ratings.
CD74HCT139E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-DIP (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-PDIP
CD74HCT139E FAQ
1.How can I place an order for CD74HCT139E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT139E 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 CD74HCT139E reliable?
The price and inventory of CD74HCT139E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT139E is usually 5 days.
3.What payment methods are accepted for CD74HCT139E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT139E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT139E?
CD74HCT139E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT139E 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 CD74HCT139E?
For technical support, including CD74HCT139E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT139E requirements.
6.How does Aetrix verify that CD74HCT139E is sourced from the original manufacturer or authorized distributors?
All CD74HCT139E 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 CD74HCT139E meets industry standards.
7.What is the process for return or replacement of CD74HCT139E?
All CD74HCT139E units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT139E, 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 CD74HCT139E part is unused and in its original packaging.
Return procedure for CD74HCT139E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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