CD74ACT138E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments CD74ACT138E is a high-speed ACT-family 3-to-8 line decoder with 8 active-low outputs, 24 mA sink current, and 50 pF load capacitance rating. It provides standard input conditioning in a 16-pin DIP package for through-hole PCB designs. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD74ACT138E Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4500(MOQ 1)
- 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 CD74ACT138E?
- 3-to-8 line decoder with 8 active-low outputs for address decoding and demultiplexing
- High output sink current of 24 mA enables direct driving of standard logic and bus loads
- ACT family CMOS logic for TTL-compatible inputs with 5 V CMOS output performance
- 50 pF load capacitance rating ensures robust operation in capacitively loaded bus environments
- 16-pin DIP through-hole package simplifies prototyping and legacy hardware replacement
What is CD74ACT138E used for?
The CD74ACT138E is commonly used in memory address decoding circuits where 3 address lines must select one of 8 memory banks or peripheral devices. It is also applied in data demultiplexing, chip-select generation for microcontroller expansion bus designs, and logic enable/disable control of up to 8 circuit blocks. Its ACT-family compatibility with TTL logic levels makes it a reliable drop-in choice for upgrading legacy 74LS138 decoder circuits to higher-speed CMOS performance.
What are the specifications of CD74ACT138E?
| YTEOL | 15 |
| Family | ACT |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | 3-LINE TO 8-LINE DECODER |
| Max I(ol) | 0.024A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 12ns |
| Propagation Delay (tpd) | 12ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia, Mexico |
Where can I find the CD74ACT138E datasheet?
CD74ACT138E Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74ACT138E?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many address inputs and output lines does the CD74ACT138E decoder provide?
The CD74ACT138E is a 3-to-8 line decoder that accepts 3 binary address inputs and activates one of 8 active-low outputs at a time. It also includes 3 enable inputs — two active-low and one active-high — to allow easy cascading or gating of multiple devices, supporting larger address decoding matrices beyond 8 outputs in complex bus systems.
What is the output sink current rating of the CD74ACT138E, and which load types can it directly drive?
The CD74ACT138E has a maximum output low-state sink current (Iol) of 24 mA per output, which is sufficient to directly drive standard CMOS and TTL inputs, small indicator LEDs, and bus buffer enable lines without additional buffering. This 24 mA rating far exceeds the typical 4–8 mA of standard HC-family devices, giving the ACT138E superior fan-out in bus-intensive designs.
When is the CD74ACT138E preferred over its HC-family counterpart for address decoding?
The CD74ACT138E should be selected over the 74HC138 when the circuit must interface with TTL logic levels at 5 V supply and demands higher output sink current of 24 mA versus the HC family's typical 4 mA. Its ACT logic family provides faster switching with TTL-compatible thresholds and better drive strength, making it better suited for buffered address buses in SRAM, FLASH, and I/O expansion systems with 50 pF or higher bus capacitance.
Is the CD74ACT138E available in a surface-mount package as an alternative to its 16-pin DIP format?
The CD74ACT138E specifically comes in a 16-pin PDIP (R-PDIP-T16) through-hole package, which is preferred for prototyping, repair, and legacy board designs. For surface-mount applications requiring the same 3-to-8 decoder function with 24 mA output drive and ACT-family performance, designers can consider equivalent devices in SOIC or TSSOP packages within Texas Instruments' CD74ACT138 product family.
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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 |
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| 1+ | $0.7700 | $0.77 |
| 25+ | $0.7320 | $18.30 |
| 100+ | $0.5800 | $58.00 |
| 1000+ | $0.4767 | $476.70 |
| 5000+ | $0.4711 | $2355.50 |
| 100000+ | $0.4500 | $45000.00 |
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