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Texas Instruments CD74HCT139M
- Part No.:
- CD74HCT139M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT139M.pdf
- Description:
- CD74HCT139 HIGH SPEED CMOS LOGIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,215
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Product details
Overview
CD74HCT139M from Texas Instruments is a dual 2-to-4 line decoder/demultiplexer in SOIC-16 package, operating at 4.5V–5.5V with LSTTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V), active-low mutually exclusive outputs, and -55°C to +125°C temperature range-used for memory decoding and data routing in industrial control systems.
For engineers reviewing the CD74HCT139M datasheet, CD74HCT139M pinout, CD74HCT139M application, or CD74HCT139M equivalent, this page delivers verified functional identity, true pin mapping, real-world timing specs (tPLH/tPHL ≤ 51 ns @ 4.5 V), output drive capability (10 LSTTL loads), and validated alternative options for decoder/demux selection.
Technical Context
The CD74HCT139M 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). All outputs remain high when enable is high-enabling chip-select cascading and demultiplexer operation where enable serves as data input.
It belongs to the HCT logic family: CMOS process with TTL-level input thresholds, rail-to-rail output swing, and quiescent current ICC ≤ 160 µA over full temperature range. Propagation delays are symmetric (tPLH ≈ tPHL), and transition times are balanced (tTHL ≈ tTLH), supporting clean signal routing in mixed-logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures direct compatibility with 5 V LSTTL systems without level shifting. |
| Input Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - guarantees reliable recognition of standard TTL logic levels. |
| Propagation Delay | tPLH/tPHL ≤ 51 ns @ CL = 50 pF, VCC = 4.5 V - supports decoding in sub-60 ns timing-critical address paths. |
| Output Drive | 10 LSTTL loads - sufficient to drive multiple downstream TTL gates without buffering. |
| Operating Temp | -55°C to +125°C - qualified for extended industrial, aerospace, and automotive under-hood applications. |
| Logic Family | HCT - combines CMOS power efficiency with TTL input compatibility and noise immunity (NIL/NIH = 30% of VCC). |
| Quiescent Current | ICC ≤ 160 µA @ -55°C to +125°C - enables low-static-power system design in always-on modules. |
Pinout & Package
CD74HCT139M is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012, with 1.27 mm pitch, gull-wing leads, and RoHS-compliant NiPdAu finish. Moisture sensitivity level is MSL-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1E, 2E | Active-low enable inputs | Enable/disable respective decoder; high = all outputs forced high; used for cascading or data gating. |
| 1A0, 1A1 / 2A0, 2A1 | Binary select inputs | Two-bit address selects one of four active-low outputs per decoder (Y0–Y3). |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Only one output per decoder goes low per valid input combination; outputs are mutually exclusive and open-drain compatible. |
| VCC (Pin 16) | Positive supply | 4.5–5.5 V DC; must be decoupled locally to suppress switching noise on shared rails. |
| GND (Pin 8) | Ground reference | Common return path for all inputs, outputs, and internal logic; requires low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables two separate 2-to-4 decode paths on one IC-reducing board space vs. discrete solutions. |
| Active-low mutually exclusive outputs | Guarantees only one Yx output is asserted per decoder, preventing bus contention in memory or peripheral selection. |
| LSTTL input compatibility | Eliminates need for external level shifters when interfacing with legacy 5 V TTL microcontrollers or FPGAs. |
| Balanced propagation delay | tPLH ≈ tPHL ensures minimal skew between rising/falling edges-critical for synchronous address decoding. |
| Wide temperature operation | Validated from -55°C to +125°C-supports deployment in uncontrolled environments like motor drives or outdoor instrumentation. |
Applications
| Memory Address Decoding | Data Routing in Industrial PLCs |
|---|---|
Use Scenario: Selecting one of four RAM/ROM chips in a microcontroller-based embedded system using 2-bit address lines. IC Role / Device Role / Timing Role: Dual decoder maps A0/A1 to chip-select signals (CS0–CS3); enable pins tied to higher-order address bits for bank selection. Use Value: Reduces external logic count by integrating two decoders; 51 ns max delay ensures setup/hold compliance with 10 MHz bus timing. | Use Scenario: Directing sensor data streams from four analog input channels to a single ADC based on controller command. IC Role / Device Role / Timing Role: Acts as a 1-to-4 demultiplexer where enable (E) is the data input and A0/A1 select destination channel. Use Value: Enables deterministic, glitch-free channel selection with no additional control logic-simplifies firmware state machine. |
| Peripheral Interface Selection | Legacy Bus Expansion |
Use Scenario: Enabling one of four UART, SPI, or GPIO expansion ICs on a baseboard via shared control bus. IC Role / Device Role / Timing Role: Decoder output drives /CS of target peripheral; outputs actively pulled low ensure robust deassertion of unused devices. Use Value: Prevents spurious activation during reset or brown-out due to active-low assertion and mutual exclusivity. | Use Scenario: Expanding ISA or similar parallel bus to support up to four legacy I/O cards with dedicated address windows. IC Role / Device Role / Timing Role: Cascaded enable structure (e.g., 1E driven by upper address bit, 2E by lower) creates hierarchical decode tree. Use Value: Maintains strict timing alignment across multiple decode stages-verified by matched tPLH/tPHL and low skew. |
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 |
|---|---|---|---|
| SN74HCT139D | Same HCT logic family, identical pinout (SOIC-16), identical electrical specs; TI second-source part with identical marking "HCT139D". | No functional difference; fully interchangeable in existing designs with same layout and BOM. | Select when requiring TI's alternate packaging or sourcing flexibility without redesign. |
| 74ACT139SCX | Advanced CMOS (ACT) family: wider VCC range (4.5–5.5 V), faster tPLH/tPHL (≤ 9.5 ns @ 5 V), higher drive (24 mA), but higher ICC (max 4 mA). | Better suited for high-speed bus applications demanding <10 ns decode latency; not drop-in due to higher static current and different noise margin profile. | Choose only when timing budget requires sub-10 ns performance and power budget allows higher quiescent draw. |
Compared with SN74HCT139D, CD74HCT139M offers identical functionality and pinout-making it a direct second-source option; versus 74ACT139SCX, CD74HCT139M trades speed for lower power and proven noise immunity in electrically noisy industrial settings.
Availability
CD74HCT139M is available at Aetrix Electronics and suitable for memory decoding, industrial PLC I/O expansion, legacy bus interface, and automotive control module applications requiring stable component supply across extended temperature ranges.
Supply support for CD74HCT139M 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 headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CD74HCT139M belongs to TI's High-Speed CMOS Logic (HCT) product line, designed specifically to replace bipolar TTL in 5 V systems while delivering CMOS power efficiency and noise immunity.
FAQ
What is the maximum propagation delay of CD74HCT139M at 5 V?
The maximum propagation delay (tPLH/tPHL) of CD74HCT139M is 51 ns when measured at VCC = 4.5 V, CL = 50 pF, and over the full -55°C to +125°C temperature range. At nominal 5 V operation, typical delay is ~43 ns, and worst-case remains within the 51 ns limit per datasheet Section 5 (Switching Specifications).
Is CD74HCT139M pin-compatible with CD4556B?
Yes, CD74HCT139M is explicitly stated in the datasheet as pin-compatible with CD4556B. Both share identical 16-pin SOIC pinout, including matching enable (E), select (A0/A1), and output (Y0–Y3) assignments-enabling direct replacement in legacy designs without PCB modification.
Can CD74HCT139M operate at 3.3 V supply?
No, CD74HCT139M is specified only for 4.5 V to 5.5 V operation. Its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and internal logic design require minimum 4.5 V to guarantee correct switching behavior and noise margins; use CD74HC139M for 2–6 V operation instead.
What does the "M96G4" suffix mean in CD74HCT139M96G4?
The "M96G4" suffix indicates a SOIC-16 package (M), tape-and-reel packaging (96), and Green (RoHS-compliant, halogen-free) material specification (G4). It denotes 2500 units per reel, MSL Level-1 rating, and NiPdAu lead finish-consistent with TI's standard industrial-grade packaging nomenclature.
Does CD74HCT139M support demultiplexer functionality?
Yes, CD74HCT139M supports demultiplexer operation: the active-low enable input (1E or 2E) serves as the data input, while A0/A1 select which of the four outputs (Y0–Y3) passes the inverted data. This is confirmed in the Functional Description section and Truth Table of the SCHS148D datasheet.
CD74HCT139M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HCT139M FAQ
1.How can I place an order for CD74HCT139M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT139M 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 CD74HCT139M reliable?
The price and inventory of CD74HCT139M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT139M is usually 5 days.
3.What payment methods are accepted for CD74HCT139M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT139M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT139M?
CD74HCT139M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT139M 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 CD74HCT139M?
For technical support, including CD74HCT139M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT139M requirements.
6.How does Aetrix verify that CD74HCT139M is sourced from the original manufacturer or authorized distributors?
All CD74HCT139M 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 CD74HCT139M meets industry standards.
7.What is the process for return or replacement of CD74HCT139M?
All CD74HCT139M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT139M, 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 CD74HCT139M part is unused and in its original packaging.
Return procedure for CD74HCT139M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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