CD74AC139M Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments CD74AC139M is a dual 2-line to 4-line decoder/demultiplexer in a 16-pin SOIC package. It belongs to the AC logic family, operates with 50 pF load capacitance, and sinks up to 24 mA per output. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74AC139M Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4758(MOQ 40)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74AC139M?
- Dual independent 2-to-4 line decoder/demultiplexer providing 8 active-low decoded outputs in a single 16-pin SOIC package
- Advanced CMOS AC logic family with 50 pF load capacitance rating and 24 mA sink current for driving TTL and CMOS bus loads
- Active-low enable inputs on each decoder section allow cascading and bus expansion without additional glue logic
What is CD74AC139M used for?
The CD74AC139M is used in memory address decoding, I/O port selection, and chip-enable generation in microprocessor and microcontroller bus systems where two independent 1-of-4 decode functions are needed in one package. Its high-speed AC logic switching supports address decoding at bus clock rates above 50 MHz while maintaining compatibility with 5 V TTL and 3.3 V CMOS logic levels. Embedded control boards and FPGA expansion headers also use the CD74AC139M as a compact peripheral select logic block.
What are the specifications of CD74AC139M?
| YTEOL | 0 |
| Family | AC |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | 2-LINE TO 4-LINE DECODER |
| Max I(ol) | 0.024A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 14.7ns |
| Propagation Delay (tpd) | 131ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Where can I find the CD74AC139M datasheet?
CD74AC139M Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74AC139M?
Compatible alternatives and drop-in replacements for CD74AC139M:
Frequently Asked Questions
How many independent decoder sections does the CD74AC139M contain and what is the output configuration?
The CD74AC139M contains 2 independent 2-line to 4-line decoder sections, each with 4 active-low decoded outputs and 1 active-low enable input. This dual structure provides a total of 8 decoded output lines in a single 16-pin SOIC package, saving board space compared to using two separate single-section decoder ICs.
What output sink current can the CD74AC139M drive, and is it compatible with TTL logic?
Each output of the CD74AC139M can sink up to 24 mA, which is sufficient to directly drive standard TTL inputs, LEDs, and optocoupler inputs without external buffers. The AC family logic also guarantees compatibility with 5 V TTL logic levels, making it a drop-in upgrade for older LS-TTL decoder circuits.
At what load capacitance is the CD74AC139M specified, and what does this mean for PCB routing?
The CD74AC139M is characterized at a load capacitance of 50 pF, which corresponds to typical PCB trace capacitance plus one or two CMOS inputs. Keeping total load capacitance near 50 pF per output ensures the device meets its propagation delay spec; heavier loads slow switching and may require series termination resistors of 22 ohm to 33 ohm.
Can the CD74AC139M be cascaded to decode more than 4 address lines?
Yes. The active-low enable input on each CD74AC139M section allows cascading: one decoder section selects which of several CD74AC139M chips is active by driving the enable pins. This technique extends decoding to 3-to-8 or 4-to-16 lines using 2 to 4 devices, covering 16 or more chip-select signals in memory or I/O expansion systems.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 40+ | $0.8175 | $32.70 |
| 120+ | $0.7469 | $89.63 |
| 280+ | $0.7055 | $197.54 |
| 1000+ | $0.6369 | $636.90 |
| 10000+ | $0.5679 | $5679.00 |
| 100000+ | $0.4758 | $47580.00 |
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