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| Product attributes | Property Value |
| Manufacturer | NXP USA Inc. |
| Product Series | 74HCT |
| Packaging | | |
| Part Status | Active |
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 4 |
| Number of Bits per Element | 1 |
| Input Type | - |
| Output Type | 3-State |
| Current - Output High, Low | 6mA, 6mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Supplier Device Package | 14-SO |
The 74HCT125D/AU118 is a quad non-inverting buffer from NXP's 74HCT logic family. It features four independent channels with 3-state outputs, each capable of sourcing and sinking 6mA. Operating from 4.5V to 5.5V, it is designed for 5V TTL-compatible systems. The 3-state outputs allow for bus sharing and isolation, making it ideal for memory interfacing, bus driving, and industrial control. Housed in a 14-SOIC package, it offers a compact solution for multi-channel buffering needs.
- Quad 3-State Buffers: Provides four independent channels with individual enable controls, maximizing design flexibility for bus systems.
- TTL-Compatible Inputs: Allows direct interfacing with 3.3V logic, simplifying mixed-voltage designs.
- Wide Temperature Range (-40°C to 125°C): Suitable for industrial and automotive environments where temperature extremes are common.
- Standard 14-SOIC Package: Easy to integrate into existing PCB designs, reducing layout complexity.
5V Bus Interfacing and Isolation
The 74HCT125D/AU118 is perfect for connecting multiple 5V peripherals to a microcontroller bus. Its 3-state outputs allow individual channel isolation, preventing bus contention and enabling multiple devices to share the same data lines.
Memory Address Decoding
In memory systems, this quad buffer can drive address lines to multiple memory chips. The 3-state outputs allow the address bus to be disconnected when not in use, reducing power consumption and signal loading.
Driving High-Capacitance Loads
With 6mA source and sink capability, this buffer can drive long PCB traces, cables, or multiple logic inputs. This ensures signal integrity in systems with high fan-out requirements.
Level Shifting from 3.3V to 5V
Although designed for 5V operation, the TTL-compatible inputs allow it to accept 3.3V logic levels. This makes it a simple solution for interfacing 3.3V microcontrollers to 5V peripherals.
Industrial Control Logic
In industrial PLCs and control systems, the 74HCT125D/AU118 provides robust buffering for control signals. Its wide temperature range (-40°C to 125°C) ensures reliable operation in factory environments.
Peripheral Driver for Test Equipment
In automated test equipment, this buffer can drive multiple test points or relays. The 3-state outputs allow the test system to isolate individual channels during testing, improving accuracy.
- Q: What is the logic family of the 74HCT125D/AU118?
- A: It belongs to the 74HCT (High-Speed CMOS with TTL compatibility) logic family.
- Q: What is the function of this IC?
- A: It is a quad (4-channel), non-inverting buffer with 3-state outputs.
- Q: How many channels does it have?
- A: It has 4 independent channels, each with its own output enable control.
- Q: What is the output type?
- A: The outputs are 3-State, allowing them to be high, low, or high-impedance for bus sharing.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, making it ideal for 5V TTL-compatible systems.
- Q: What package is available?
- A: It comes in a 14-SOIC (0.154", 3.90mm Width) surface-mount package.
74HCT125D/AU118.pdf
- Q: What is the logic family of the 74HCT125D/AU118?
- A: It belongs to the 74HCT (High-Speed CMOS with TTL compatibility) logic family.
- Q: What is the function of this IC?
- A: It is a quad (4-channel), non-inverting buffer with 3-state outputs.
- Q: How many channels does it have?
- A: It has 4 independent channels, each with its own output enable control.
- Q: What is the output type?
- A: The outputs are 3-State, allowing them to be high, low, or high-impedance for bus sharing.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, making it ideal for 5V TTL-compatible systems.
- Q: What package is available?
- A: It comes in a 14-SOIC (0.154", 3.90mm Width) surface-mount package.