SN74F138NIn StockTexas Instruments
SN74F138N is a high-speed TTL 3-to-8 line decoder/demultiplexer with two active-low and one active-high enable inputs, available in a 16-pin DIP package. From $0.40 in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN74F138N Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3984(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3-to-8 line decoder/demultiplexer with active-low outputs for address decoding and data routing
- Two active-low (G2A, G2B) and one active-high (G1) enable inputs allow cascading and memory expansion
- Texas Instruments F/FAST family for high-speed operation with 50 pF load capacitance
- 16-pin DIP package (R-PDIP-T16) for easy through-hole PCB assembly and prototyping
- RoHS compliant (Pb-free, e4) with 15-year EOL support for long-life applications
Applications
The SN74F138N is widely used in address decoding for microprocessor and memory systems, enabling efficient selection of up to 8 memory banks or peripheral devices. It is also applied in data demultiplexing, bus expansion, and digital logic systems where fast, reliable signal routing is required. Its multiple enable inputs make it ideal for cascading in larger decoding networks used in industrial control, communications, and embedded systems.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | TWO ACTIVE-LOW AND ONE ACTIVE-HIGH ENABLE INPUTS |
| Family | F/FAST |
| 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) | 0.02A |
| 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) | 20mA |
| Prop. Delay@Nom-Sup | 9ns |
| Propagation Delay (tpd) | 9ns |
| 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 | TTL |
| Temperature Grade | COMMERCIAL |
| 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 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74F138N:
Frequently Asked Questions
What is the logic function of the SN74F138N?
The SN74F138N is a 3-to-8 line decoder/demultiplexer. It takes a 3-bit binary address input and activates one of eight active-low outputs. It features two active-low enable inputs (G2A, G2B) and one active-high enable input (G1), allowing flexible enable control and cascading for larger decoding arrays.
What package and pin count does the SN74F138N use?
The SN74F138N is housed in a 16-pin dual in-line package (PDIP, JESD-30 code R-PDIP-T16), which is a standard through-hole package. This makes it suitable for breadboard prototyping and traditional PCB assembly. The load capacitance is rated at 50 pF.
What are common applications for the SN74F138N?
Common applications include memory address decoding in microprocessor systems, selection of up to 8 peripherals or memory banks, data demultiplexing, and bus expansion. Its enable inputs allow multiple SN74F138N devices to be cascaded to decode larger address spaces in embedded and industrial control systems.
Is the SN74F138N RoHS compliant and what is its availability?
Yes, the SN74F138N is RoHS compliant with a Pb-free code (Yes) and JESD-609 code e4. It has a 15-year YTEOL (years to end of life), indicating long-term availability. It is priced from approximately $0.40 and is available for worldwide shipping.
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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.
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