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| Product attributes | Property Value |
| Manufacturer | Fairchild Semiconductor |
| Product Series | 74HC |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| 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 | 20-SOIC (0.295", 7.50mm Width) |
| Supplier Device Package | 20-SOIC |
| ROHS |  |
The MM74HC240WM is a dual-channel inverting buffer from Fairchild Semiconductor, part of the 74HC logic family. It operates from 2V to 6V and provides 3-State outputs, allowing for direct connection to shared buses. Each channel can source or sink 7.8mA, making it suitable for driving LEDs or buffering logic signals. The 20-SOIC package is ideal for space-constrained PCB layouts. Typical applications include bus interfacing, signal inversion, and level shifting in industrial and consumer electronics.
- Wide 2V to 6V Supply Range: Compatible with both 3.3V and 5V systems, simplifying mixed-voltage design.
- 3-State Outputs: Enables bus sharing without contention, improving system reliability.
- Inverting Function: Provides signal inversion without additional logic gates, saving board space.
- 7.8mA Drive Capability: Sufficient for driving LEDs and small loads directly.
- Industrial Temperature Range: -40°C to 85°C ensures operation in harsh environments.
Bus Interfacing in Mixed-Voltage Systems
The 3-State outputs allow the MM74HC240WM to be connected directly to a shared data bus. When the output enable is inactive, the high-impedance state prevents bus contention, making it ideal for memory and peripheral interfacing.
Inverting Signal Buffering for Logic Circuits
Use this buffer to invert and strengthen weak logic signals. The 7.8mA drive capability ensures reliable signal integrity over short PCB traces, reducing noise susceptibility in digital designs.
Level Shifting Between 3.3V and 5V Logic
With a wide 2V to 6V supply range, the MM74HC240WM can operate at 3.3V or 5V. This allows it to act as a simple level translator when interfacing different logic families, provided the input thresholds are compatible.
Driving LED Arrays in Industrial Displays
The inverting buffer can sink up to 7.8mA per channel, which is sufficient to drive standard LEDs. By placing the LED between VCC and the output, the buffer acts as a current sink, simplifying display driver circuits.
Glue Logic for Microcontroller Peripherals
In embedded systems, this buffer can isolate the microcontroller from heavy capacitive loads on peripheral lines. The 3-State feature also allows multiple peripherals to share the same I/O lines without interference.
Automotive ECU Signal Conditioning
Operating over -40°C to 85°C, this buffer is suitable for automotive electronic control units. It can buffer and invert sensor signals, ensuring clean logic levels for the ECU's processor.
- Q: What is the logic family of the MM74HC240WM?
- A: It belongs to the 74HC family, operating from 2V to 6V.
- Q: What is the function of this IC?
- A: It is an inverting buffer with 2 channels.
- Q: What is the output type?
- A: It features 3-State outputs for bus-oriented applications.
- Q: What is the output current capability?
- A: It can source or sink 7.8mA per channel.
- Q: What is the operating temperature range?
- A: It is rated for -40°C to 85°C.
- Q: What package is available?
- A: It comes in a 20-SOIC (7.50mm width) package.
MM74HC240WM.pdf
- Q: What is the logic family of the MM74HC240WM?
- A: It belongs to the 74HC family, operating from 2V to 6V.
- Q: What is the function of this IC?
- A: It is an inverting buffer with 2 channels.
- Q: What is the output type?
- A: It features 3-State outputs for bus-oriented applications.
- Q: What is the output current capability?
- A: It can source or sink 7.8mA per channel.
- Q: What is the operating temperature range?
- A: It is rated for -40°C to 85°C.
- Q: What package is available?
- A: It comes in a 20-SOIC (7.50mm width) package.