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Texas Instruments CD74HC139M
- Part No.:
- CD74HC139M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HC139M.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,607
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Product details
Overview
CD74HC139M from Texas Instruments is a dual 2-to-4 line decoder/demultiplexer in SOIC-16 package, operating from 2V to 6V supply, featuring active-low mutually exclusive outputs, -55°C to +125°C temperature range, and propagation delay of 25 ns (typ) at 6V. It serves as a logic-level address decoder in memory subsystems and data routing paths.
For engineers reviewing the CD74HC139M datasheet, CD74HC139M pinout, CD74HC139M application, or CD74HC139M equivalent, this page delivers verified functional identity, validated pin mapping, confirmed HC-family electrical behavior, and real-world use context for industrial control, instrumentation, and embedded system design.
Technical Context
The CD74HC139M integrates two independent binary-to-1-of-4 decoders, each with a single active-low enable input (1E/2E) and dual select inputs (A0/A1). Outputs are active-low and mutually exclusive - only one Y0–Y3 goes low per valid select+enable combination.
It implements standard CMOS logic architecture with rail-to-rail input thresholds (VIH = 1.5V min at VCC = 2V; VIL = 0.5V max), supports fanout of 10 LSTTL loads, and exhibits balanced tPLH/tPHL delay symmetry (25 ns max at 6V, CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual 2-to-4 line decoder / demultiplexer with active-low outputs |
| Supply Voltage Range | 2V to 6V - enables direct interface with 3.3V and 5V logic systems without level shifters |
| Propagation Delay (tPLH/tPHL) | 25 ns (max) at VCC = 6V, CL = 50 pF - ensures timing predictability in synchronous address decoding |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial and aerospace environments |
| Output Drive Capability | ±25 mA per output - sufficient to directly drive LED indicators or small logic loads |
| Input Leakage Current | ±1 µA max at VCC = 6V - minimizes static power draw in battery-backed or low-power hold modes |
| Power Dissipation Capacitance | 55 pF - used to calculate dynamic power: PD = VCC² × fi × (CPD + CL) |
Pinout & Package
CD74HC139M is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012 compliant, moisture sensitivity level 1, and RoHS-compliant NiPdAu lead finish.
| 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 | Address bits selecting which of four outputs goes low (Y0–Y3) |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Only one output per section is low per valid A0/A1 + E combination |
| VCC (Pin 16) | Positive supply | 2V–6V CMOS-compatible supply rail; decoupling capacitor required near pin |
| GND (Pin 8) | Ground reference | Common return path for all internal logic and output current sinks |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables parallel address decoding or cascaded 1-of-8 operation using enable chaining |
| Active-low mutually exclusive outputs | Eliminates bus contention; simplifies OR-ing of outputs for priority encoding |
| High noise immunity (NIL/NIH = 30% at VCC = 5V) | Reduces susceptibility to switching noise in mixed-signal PCB layouts |
| Low quiescent current (ICC ≤ 160 µA max at 125°C) | Supports low-power standby modes in portable or energy-constrained systems |
| Pin compatibility with CD4556B | Allows drop-in replacement in legacy designs using that CMOS decoder |
Applications
| Memory Address Decoding | Data Routing in Industrial PLCs |
|---|---|
Use Scenario: Selecting one of four SRAM or EEPROM chips in a microcontroller-based data logger. IC Role / Device Role / Timing Role: Address decoder translating 2-bit chip-select bus into individual /CS lines. Use Value: Enables compact 4-chip memory expansion without external glue logic or FPGA resources. |
Use Scenario: Routing sensor data streams from four analog input modules to a shared ADC channel. IC Role / Device Role / Timing Role: Demultiplexer steering time-multiplexed signals under microcontroller control. Use Value: Reduces component count versus discrete transistor switches while maintaining signal integrity at <1 MHz rates. |
| Industrial Control Panel Logic | Test Equipment Signal Selection |
Use Scenario: Driving four independent LED status indicators based on 2-bit mode register output. IC Role / Device Role / Timing Role: Output driver translating encoded state bits into visual feedback signals. Use Value: Provides direct LED sink capability (25 mA per output) without external transistors or current-limiting resistors per channel. |
Use Scenario: Selecting one of four calibration reference voltages in automated test equipment. IC Role / Device Role / Timing Role: Precision signal switch enabling repeatable voltage source selection under digital control. Use Value: Guarantees monotonic switching (no glitches) due to mutually exclusive outputs, critical for metrology-grade accuracy. |
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 |
|---|---|---|---|
| CD74HCT139M | 5V-only operation (4.5–5.5V); TTL-compatible inputs (VIL ≤ 0.8V, VIH ≥ 2.0V) | Better suited for mixed LS-TTL/CMOS systems; not usable below 4.5V | Select when interfacing directly with legacy 5V TTL logic families and strict input threshold matching is required. |
| SN74HC139DR | Same HC logic family, identical function, but TI's newer SOIC-16 packaging with enhanced thermal performance (θJA = 70°C/W vs. 73°C/W) | Identical pinout and electrical behavior; optimized for high-volume automated assembly | Preferred for new designs requiring long-term supply continuity and tighter thermal specs in dense PCB layouts. |
Compared with CD74HC139M, CD74HCT139M trades wide-voltage flexibility for guaranteed TTL interoperability, while SN74HC139DR offers identical functionality with improved manufacturability and lifecycle support - making it the recommended upgrade path for production ramp.
Availability
CD74HC139M is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, and embedded data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HC139M 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The CD74HC139M belongs to TI's legacy High-Speed CMOS (HC) logic family, designed specifically for robust, low-power, wide-temperature digital interfacing in mission-critical industrial and aerospace systems.
FAQ
What is the maximum supply voltage rating for CD74HC139M?
The absolute maximum DC supply voltage for CD74HC139M is 7V, but its functional operating range is specified from 2V to 6V. Operating above 6V risks violating the recommended conditions and may cause unpredictable logic behavior or accelerated wear-out. Always maintain VCC within 2V–6V for reliable operation per the SCHS148D datasheet.
Does CD74HC139M support cascading for 1-of-8 decoding?
Yes, CD74HC139M supports cascading: the active-low enable inputs (1E and 2E) can be driven by an external select bit, allowing one section to decode addresses 0–3 and the other 4–7. This configuration uses no additional logic gates and preserves mutual exclusivity across all eight outputs when properly controlled.
Is CD74HC139M pin-compatible with CD4556B?
Yes, CD74HC139M is explicitly stated as pin-compatible with CD4556B in the datasheet. Both share identical pin assignments for VCC, GND, enable, select inputs, and decoded outputs - enabling direct replacement in legacy CMOS designs without PCB modification.
What is the output drive strength of CD74HC139M at 5V supply?
At VCC = 5V, CD74HC139M guarantees ±4 mA output source/sink current under standard load conditions, and supports up to ±25 mA per output (absolute maximum rating). For sustained 25 mA operation, thermal derating and PCB copper area must be verified per the device's θJA = 73°C/W specification.
Can CD74HC139M operate reliably at -55°C?
Yes, CD74HC139M is fully characterized and guaranteed to operate across -55°C to +125°C. Its DC and switching specifications - including VIH/VIL thresholds, propagation delay, and output drive - are validated over this full military-grade temperature range, making it suitable for downhole, avionics, and polar-environment applications.
CD74HC139M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HC139M FAQ
1.How can I place an order for CD74HC139M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC139M 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 CD74HC139M reliable?
The price and inventory of CD74HC139M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC139M is usually 5 days.
3.What payment methods are accepted for CD74HC139M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC139M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC139M?
CD74HC139M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC139M 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 CD74HC139M?
For technical support, including CD74HC139M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC139M requirements.
6.How does Aetrix verify that CD74HC139M is sourced from the original manufacturer or authorized distributors?
All CD74HC139M 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 CD74HC139M meets industry standards.
7.What is the process for return or replacement of CD74HC139M?
All CD74HC139M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC139M, 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 CD74HC139M part is unused and in its original packaging.
Return procedure for CD74HC139M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74HC139M Tags
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TCA9546APWR
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SN74HC138N
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