74HCT126DB,112

Overview

The Nexperia 74HCT126DB,112 is a quad buffer and line driver featuring three-state outputs controlled by active HIGH output enable inputs (nOE). It operates within a supply voltage range of 4.5 V to 5.5 V and accepts TTL input levels. The device provides four non-inverting buffers with high-impedance OFF-states when disabled. Key electrical parameters include a propagation delay of up to 36 ns at 4.5 V, low-level output current of 6 mA, and high-level output current of -6 mA. Static supply current is limited to 80 µA at 4.5 V. It functions reliably across an ambient temperature range of -40 °C to +125 °C.

Feature Summary

• Quad buffer/line driver with three-state outputs controlled by active HIGH enable inputs
• Accepts TTL input levels for compatibility with Transistor-Transistor Logic systems
• Inputs include clamp diodes enabling interface to voltages exceeding VCC using current limiting resistors
• ESD protection exceeds 2000 V per Human Body Model and 1000 V per Charged Device Model

Applications

• Bus-oriented transmissions
• Clock buffering and distribution
• Memory data bus drivers
• I/O port expansion

Procurement Notes

Verify the specific ordering suffix

Selection Notes

Select this component when TTL logic level compatibility is required alongside CMOS performance characteristics. The 74HCT126 series is suitable for applications needing isolated bus driving capabilities where high noise immunity and latch-up protection are critical design constraints.

Part Context

This part belongs to the 74HCT family of high-speed Si-gate CMOS devices, which are pin-compatible with Low-power Schottky TTL (LSTTL). The 'DB' designation indicates the SSOP-14 package variant, although official datasheets primarily list SO14 and TSSOP14 packages for the base type number. It serves as a standard logic buffer within the broader 74HC/HCT product line.

Replacement Considerations

Direct substitutes include other 74HCT126 variants in different packages such as 74HCT126D or 74HCT126PW. Cross-family replacements like 74HC126 offer similar functionality but require CMOS input level compatibility instead of TTL.