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| Product attributes | Property Value |
| Manufacturer | Fairchild Semiconductor |
| 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 | -40°C ~ 85°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Supplier Device Package | 14-SOIC |
| ROHS |  |
The MM74HC126M is a quad non-inverting buffer from Fairchild Semiconductor, part of the 74HC logic family. It features four independent buffer channels with 3-State outputs, allowing for bus-oriented applications. The device operates over a wide supply voltage range of 2V to 6V, making it suitable for both 3.3V and 5V systems. Each output can sink or source 7.8mA, providing adequate drive for typical logic loads. The 14-pin SOIC package is compact and suitable for space-constrained PCB designs. This buffer is commonly used in bus interfacing, signal buffering, and level-shifting applications.
- Wide 2V to 6V Supply Range: Compatible with both 3.3V and 5V logic systems, simplifying mixed-voltage design.
- 3-State Outputs: Enables bus sharing and prevents data contention in multi-device systems.
- High Output Current (7.8mA): Provides sufficient drive for LEDs and multiple logic inputs.
- Quad Channel Configuration: Four independent buffers in a single package, saving board space.
Bus Interfacing and Isolation
The 3-State outputs allow the MM74HC126M to be used for connecting multiple peripherals to a common data bus. When the output enable is low, the buffer enters a high-impedance state, effectively disconnecting the device from the bus and preventing data collisions.
Signal Buffering for High-Fanout Applications
With a wide 2V to 6V supply range and 7.8mA output current, this buffer can drive multiple TTL or CMOS inputs. It is ideal for fan-out applications where a single signal source must drive several loads without signal degradation.
Level Shifting Between 3.3V and 5V Systems
Operating from 2V to 6V, the MM74HC126M can be powered from a 3.3V rail to buffer 3.3V logic signals, or from a 5V rail to buffer 5V signals. This flexibility simplifies interfacing between different voltage domains in mixed-voltage systems.
Driving LEDs and Low-Power Loads
The 7.8mA sink/source capability is sufficient to drive standard LEDs with a series resistor. The non-inverting buffer configuration simplifies the logic design, as the output state matches the input state.
Industrial Control Input/Output Expansion
In industrial control systems, the MM74HC126M can buffer sensor signals or control signals over longer traces. The 3-State feature allows multiple sensors to share a single ADC input line, reducing the number of I/O pins required on a microcontroller.
Memory Address and Data Line Buffering
For memory systems, this buffer can be used to isolate the memory array from the system bus. The 3-State outputs are essential for read/write operations where the memory must be disconnected from the bus when not selected.
- Q: What is the logic family of the MM74HC126M?
- 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 connection to shared buses.
- 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 (0.154" width).
MM74HC126M.pdf
- Q: What is the logic family of the MM74HC126M?
- 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 connection to shared buses.
- 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 (0.154" width).