SN74F125NIn StockTexas Instruments
SN74F125N is a quad 3-state buffer IC by Texas Instruments, featuring four independent buffers with active-low output-enable controls. Key specs: 4-channel 3-state outputs, 5V supply voltage, 74F-series high-speed logic. From $0.175, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- Price
- From $0.1750(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Quad 3-State Buffer: Four independent buffer channels with individual active-low output-enable (OE) controls for flexible bus management
- High-Speed 74F Logic: Advanced Schottky technology delivers fast propagation delays for demanding digital logic applications
- 5V TTL Compatible: Fully compatible with standard TTL logic levels, enabling seamless integration in 5V digital systems
- Low Output Impedance: High-drive 3-state outputs allow multiple devices to share a common bus without signal contention
- Standard DIP-14 Package: Through-hole N-package for easy prototyping and legacy board compatibility
Applications
The SN74F125N is widely used in microprocessor and microcontroller bus interfacing, where its 3-state outputs allow multiple data sources to share a single bus line without conflict. It is also employed in memory address and data multiplexing, bidirectional data bus buffering, and signal isolation in industrial control and communication systems. Its TTL-compatible inputs and high-speed switching make it a reliable choice for both prototyping and production digital logic designs.
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 SN74F125N and what does it do?
The SN74F125N is a quad bus buffer gate with 3-state outputs from Texas Instruments. It contains four independent buffer channels, each controlled by an active-low output-enable (OE) pin. When OE is low, the output follows the input; when OE is high, the output is in a high-impedance state, allowing multiple devices to safely share a common data bus.
What are the key electrical specifications of the SN74F125N?
The SN74F125N operates on a 5V supply voltage and is based on 74F (Fast Schottky) logic technology. It features TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), propagation delay of approximately 3.7ns, and output sink/source current of 64mA/15mA, making it suitable for high-speed bus driving applications.
What package does the SN74F125N come in and are there SMD alternatives?
The SN74F125N is housed in a 14-pin through-hole DIP (N) package, ideal for breadboarding and legacy designs. For surface-mount designs, Texas Instruments offers the SN74F125D (SOIC-14) and SN74F125PW (TSSOP-14) as functionally identical SMD alternatives with the same electrical characteristics.
What are typical applications for the SN74F125N?
The SN74F125N is commonly used in microprocessor data and address bus buffering, memory interface circuits, multi-master bus arbitration systems, and industrial control logic. Its 3-state outputs make it ideal wherever multiple signal sources must share a single transmission line, preventing bus contention.
Is the SN74F125N compatible with other logic families?
Yes, the SN74F125N is fully compatible with standard 5V TTL and LSTTL logic families. Its input thresholds and output drive levels meet TTL specifications, allowing direct interfacing with 74LS, 74S, and 74F series devices without level-shifting. It is not directly compatible with 3.3V CMOS logic without appropriate voltage translation.
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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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.3750 | $0.38 |
| 25+ | $0.2879 | $7.20 |
| 65+ | $0.2500 | $16.25 |
| 241+ | $0.1750 | $42.17 |
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