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| Product attributes | Property Value |
| Manufacturer | Fairchild Semiconductor |
| Product Series | 74VHCT |
| 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 | 8mA, 8mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SOP |
| ROHS |  |
The 74VHCT240ASJX is a high-speed inverting buffer from Fairchild Semiconductor, part of the 74VHCT logic family. It features two channels with 3-State outputs, capable of sinking or sourcing 8mA. Operating from a 4.5V to 5.5V supply, it is ideal for 5V systems requiring signal inversion and buffering. The TTL-compatible inputs make it suitable for mixed-voltage environments. This buffer is commonly used in bus interfacing, signal conditioning, and driving LEDs or other loads. Its 20-SOIC package is compact and suitable for space-constrained PCB designs.
- TTL-Compatible Inputs: Simplifies interfacing with 3.3V logic, ensuring reliable signal detection in mixed-voltage systems.
- 3-State Outputs: Enables bus sharing and multiplexing, reducing the need for external bus isolation components.
- High Output Current (8mA): Can directly drive LEDs and other low-power loads, reducing component count.
- Wide Operating Temperature Range (-40°C to 85°C): Suitable for industrial and automotive environments.
Bus Interfacing and Isolation
The 3-State outputs allow the 74VHCT240A to be used for bus isolation, preventing data contention when multiple devices share a common data line. The high-impedance state effectively disconnects the buffer from the bus when not selected.
Signal Inversion in Control Logic
As an inverting buffer, it can be used to invert control signals such as reset lines or enable signals, ensuring correct logic polarity for various peripherals in a 5V digital system.
Driving High-Current Loads
With 8mA sink/source capability, this buffer can directly drive LEDs, relays, or other low-power loads, eliminating the need for additional driver transistors in simple indicator circuits.
Level Shifting from TTL to CMOS
The 74VHCT family features TTL-compatible inputs, allowing it to interface between 3.3V TTL logic outputs and 5V CMOS logic inputs, ensuring reliable logic level translation.
Clock Distribution and Buffering
It can buffer and invert clock signals to drive multiple loads, reducing signal degradation and ensuring clean, synchronized clock edges across a PCB.
Industrial Sensor Interfacing
In industrial controls, the buffer can condition and invert sensor output signals, providing a robust interface to a PLC or microcontroller input, with the 3-State feature allowing multiplexing of multiple sensors.
- Q: What is the logic family of the 74VHCT240ASJX?
- A: It belongs to the 74VHCT family, designed for high-speed CMOS operation with TTL-compatible inputs.
- Q: What is the function of this IC?
- A: It is an inverting buffer with 2 channels, ideal for signal inversion and buffering in digital systems.
- Q: What is the output type?
- A: It features 3-State outputs, allowing connection to shared buses with high-impedance control.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, making it suitable for 5V systems.
- Q: What is the output current capability?
- A: It can source or sink 8mA per output, suitable for driving LEDs and logic inputs.
- Q: What package is available?
- A: It comes in a 20-SOIC (0.209", 5.30mm Width) package, suitable for surface-mount PCBs.
74VHCT240ASJX.pdf
- Q: What is the logic family of the 74VHCT240ASJX?
- A: It belongs to the 74VHCT family, designed for high-speed CMOS operation with TTL-compatible inputs.
- Q: What is the function of this IC?
- A: It is an inverting buffer with 2 channels, ideal for signal inversion and buffering in digital systems.
- Q: What is the output type?
- A: It features 3-State outputs, allowing connection to shared buses with high-impedance control.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, making it suitable for 5V systems.
- Q: What is the output current capability?
- A: It can source or sink 8mA per output, suitable for driving LEDs and logic inputs.
- Q: What package is available?
- A: It comes in a 20-SOIC (0.209", 5.30mm Width) package, suitable for surface-mount PCBs.