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| Product attributes | Property Value |
| Manufacturer | onsemi |
| Product Series | 74HC |
| Packaging | Bulk | |
| 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 | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 14-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 14-SOIC |
| ROHS |  |
The MC74HC125A is a high-speed CMOS quad buffer featuring non-inverting outputs with 3-State control. Operating from 2V to 6V, it provides 7.8mA of drive current per channel, ensuring robust signal transmission. Its 3-State outputs allow for bus-oriented applications, making it ideal for memory interfacing, signal buffering, and level shifting in mixed-voltage systems. The device is available in a compact 14-SOIC package and supports a wide temperature range of -55°C to 125°C, suitable for industrial and automotive environments.
- Wide 2V to 6V Supply Range: Compatible with both 3.3V and 5V logic systems, simplifying mixed-voltage design.
- 3-State Outputs: Enables bus multiplexing and system isolation, preventing data contention.
- High-Temperature Range (-55°C to 125°C): Suitable for harsh automotive and industrial environments.
- Quad Channel Configuration: Provides four independent buffers in a single package, saving board space.
Bus Line Driving
The 3-State outputs allow multiple MC74HC125A devices to be connected to a common data bus. By enabling only one buffer at a time, data can be multiplexed without bus contention, ideal for memory and peripheral interfacing.
Signal Buffering for High-Fanout
With a wide 2V to 6V supply, this buffer can drive multiple TTL or CMOS inputs. Its high-current output (7.8mA) ensures signal integrity even when fan-out exceeds 10 loads, preventing logic level degradation.
Level Shifting in Mixed-Voltage Systems
Operating from 2V to 6V, the MC74HC125A can translate signals between 3.3V and 5V domains. For example, a 3.3V microcontroller output can be buffered to drive a 5V peripheral, simplifying mixed-voltage design.
Isolation and Impedance Control
In industrial control systems, the 3-State feature can isolate a failing subsystem from the main controller. By placing the buffer in high-impedance mode, the faulty section is disconnected, improving system reliability.
Automotive ECU Signal Conditioning
Rated for -55°C to 125°C, this buffer is suitable for automotive engine control units. It can condition and distribute sensor signals to multiple processing stages, ensuring stable operation under extreme temperatures.
Memory Address Decoding
The non-inverting buffer can drive address lines in memory systems. Its 3-State output allows multiple memory banks to share the same address bus, enabling efficient memory expansion in embedded designs.
- Q: What is the logic family of the MC74HC125AFR1?
- A: It belongs to the 74HC (High-Speed CMOS) 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 buffer channels.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for high-impedance (disconnect) states.
- Q: What is the operating voltage range?
- A: It operates from 2V to 6V, making it compatible with TTL and CMOS logic levels.
- Q: What package is available?
- A: It comes in a 14-pin SOIC package (5.30mm width).
MC74HC125AFR1.pdf
- Q: What is the logic family of the MC74HC125AFR1?
- A: It belongs to the 74HC (High-Speed CMOS) 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 buffer channels.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for high-impedance (disconnect) states.
- Q: What is the operating voltage range?
- A: It operates from 2V to 6V, making it compatible with TTL and CMOS logic levels.
- Q: What package is available?
- A: It comes in a 14-pin SOIC package (5.30mm width).