SN74ALS257ANIn StockTexas Instruments
SN74ALS257AN is a quad 2-to-1 data selector/multiplexer with 3-state outputs by Texas Instruments. Key specs: 4 channels, 3-state output control, ALS-series low-power Schottky logic. From $0.99, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- Price
- From $0.9920(MOQ 188)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Quad 2-to-1 multiplexer with 3-state outputs for bus-oriented applications
- ALS-series Advanced Low-power Schottky technology for reduced power consumption
- Active-low output enable for easy bus expansion and control
- Wide supply voltage range compatible with standard TTL logic levels
- DIP package (AN suffix) for easy prototyping and through-hole assembly
Applications
The SN74ALS257AN is widely used in data routing and bus multiplexing applications in digital systems. It is ideal for address/data bus selection in microprocessor-based designs, memory banking circuits, and programmable logic controllers. The 3-state outputs make it suitable for multi-device shared bus architectures in industrial control, communications equipment, and embedded computing platforms.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the SN74ALS257AN and what does it do?
The SN74ALS257AN is a quad 2-to-1 data selector/multiplexer from Texas Instruments' ALS (Advanced Low-power Schottky) logic family. It selects one of two 4-bit data inputs and routes it to the output based on the select input signal. The 3-state outputs allow the device to be used in bus-sharing applications where multiple devices drive a common data bus.
What are the key electrical specifications of the SN74ALS257AN?
The SN74ALS257AN operates on a 5V VCC supply and features typical propagation delays of around 8-11 ns. Output sink current is 8 mA and source current is -2.6 mA. The 3-state output enable is active-low, allowing easy bus control. It is compatible with standard TTL input and output logic levels.
What package does the SN74ALS257AN come in?
The SN74ALS257AN comes in a 16-pin plastic dual in-line package (PDIP), indicated by the 'N' suffix. This through-hole package is well suited for prototyping, development boards, and applications requiring socketed ICs. For surface-mount alternatives, Texas Instruments offers the SN74ALS257AD (SOIC) or SN74ALS257APWR (TSSOP).
What are common applications for the SN74ALS257AN?
The SN74ALS257AN is commonly used in address and data bus multiplexing in microprocessor systems, memory bank selection, and programmable logic designs. Its 3-state outputs make it ideal for multi-master bus architectures. It is also used in industrial control systems, communications equipment, and test instrumentation where data routing between sources is required.
What are suitable replacements or alternatives to the SN74ALS257AN?
Functional alternatives to the SN74ALS257AN include the SN74HC257 (CMOS, lower power, wider voltage range), SN74LS257 (standard LS logic), and SN74F257 (faster F-series). The 74ALS257 is also available from other manufacturers such as ON Semiconductor and NXP. For modern designs, consider the SN74AHCT157 for improved speed and noise immunity.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 188+ | $1.6000 | $300.80 |
| 1000+ | $1.0600 | $1060.00 |
| 2500+ | $1.0200 | $2550.00 |
| 5000+ | $1.0000 | $5000.00 |
| 100000+ | $0.9920 | $99200.00 |
In Stock · 24h Response · Worldwide Shipping
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