TC74HC126AP(F)

Overview

The TC74HC126AP(F) is a high-speed CMOS quad bus buffer fabricated with silicon gate C2MOS technology. It operates within a supply voltage range of 2 to 6 V and maintains low power dissipation with a maximum quiescent current of 4 μA at 25°C. The device features symmetrical output drive capability of 6 mA minimum for both high and low states, supporting up to 15 LSTTL loads. Typical propagation delay is 10 ns at 5 V. Inputs include protection circuits against static discharge.

Feature Summary

• Non-inverting logic function where the control input G must be set low to enable outputs; setting G high places outputs in a high-impedance state.
• High noise immunity with defined thresholds relative to the supply voltage.
• Balanced propagation delays between low-to-high and high-to-low transitions.

Applications

• Bus-oriented memory and signal driving
• Clock buffering and distribution
• Data acquisition systems

Procurement Notes

Verify the specific package type (DIP or SOP) required for your application, as the datasheet covers multiple variants. Confirm RoHS compliance status directly with the manufacturer or authorized distributor, as environmental classifications can vary by production batch. Ensure design adheres to the specified operating temperature range of -40°C to +85°C for reliable performance.

Selection Notes

Select this component when a non-inverting quad buffer with active-low enable control is required. It serves as a pin-compatible replacement for 74LS126 devices while offering lower power consumption and higher speed. Consider the 2V to 6V operating range for compatibility with various logic families.

Part Context

This part belongs to the TC74HC125/126 series of quad bus buffers from Toshiba Semiconductor and Storage. The HC126 variant specifically utilizes an active-low enable input (G), distinguishing it from the HC125 which uses an active-high enable. Both share identical electrical characteristics and pinouts.

Replacement Considerations

The TC74HC126AP(F) is functionally compatible with the standard 74LS126 logic family. Other equivalents within the same Toshiba HC series may offer different packaging options such as SOP or TSSOP, but the core logic remains consistent across the series.

FAQ

How does the TC74HC126 differ from the TC74HC125?

The primary difference lies in the control input polarity. The TC74HC126 requires the control input G to be set low to enable the outputs, whereas the TC74HC125 requires the control input to be set high.

What is the maximum quiescent current for this device?

The maximum quiescent supply current (ICC) is 4 μA at an ambient temperature of 25°C.