M74HC125B1R

Overview

The M74HC125B1R is a high-speed CMOS quad bus buffer with three-state outputs, fabricated using silicon gate C2MOS technology. It operates within a supply voltage range of 2V to 6V and supports an operating temperature from -55°C to +125°C. The device features symmetrical output impedance with minimum drive currents of 6mA for both high and low states. Propagation delay is typically 8ns at 6V supply. Quiescent supply current is maximized at 4μA at 25°C. Noise immunity is specified at a minimum of 28% VCC. The component is available in 14-pin DIP, SOP, and TSSOP packages.

Feature Summary

• Provides four independent non-inverting buffers with three-state control capability
• Features high noise immunity with input protection against static discharge and transient excess voltage
• Delivers balanced propagation delays and symmetrical output impedance characteristics

Applications

• Bus-oriented memory and signal driving applications
• Clock drivers and buffered oscillators
• Transceiver and transceiver bus drivers

Procurement Notes

Verify the obsolete status of this specific part number before procurement planning. Confirm that the required package type (DIP, SOP, or TSSOP) matches the intended manufacturing process. Ensure alternative components are identified if long-term supply continuity is required for the design lifecycle.

Selection Notes

Select this component when a quad buffer with three-state functionality is required for bus systems. Consider the wide operating voltage range suitable for various logic families. Evaluate the high-speed performance metrics against system timing requirements. Verify compatibility with existing PCB footprints for the chosen package style.

Part Context

This component belongs to the STMicroelectronics 74HC series of high-speed CMOS logic devices. It serves as a standard interface solution for digital systems requiring signal buffering and isolation. The device is designed to replace older TTL equivalents while offering improved power consumption and speed characteristics typical of modern CMOS technology.

Replacement Considerations

CD74HC125E Texas Instruments