SN74LVC157ABQBR

Overview

The SN74LVC157ABQBR is a quadruple 2-line to 1-line data selector/multiplexer from the LVC logic family. It operates within a supply voltage range of 1.65V to 3.6V and supports an industrial temperature range of -40°C to 125°C. The device features inputs that accept voltages up to 5.5V, enabling compatibility with mixed 3.3V/5V systems. It provides a maximum propagation delay of 5.2ns at 3.3V and includes ESD protection exceeding 2000V (HBM) and 1000V (CDM). The component is housed in a 16-pin WQFN package.

Feature Summary

• Operates from 1.65V to 3.6V
• Inputs accept voltages to 5.5V
• Max tpd of 5.2ns at 3.3V
• Typical VOLP (output ground bounce) 2V at VCC = 3.3V, TA = 25°C

Applications

• Mixed 3.3V/5V system translators
• Data routing in digital circuits
• Signal selection in embedded systems

Procurement Notes

Verify the specific ordering suffix BQB corresponds to the WQFN-16 package configuration. Confirm the operating temperature range matches the application requirements (-40°C to 125°C). Ensure input voltage levels do not exceed the absolute maximum ratings during operation. Check for RoHS compliance status if required by environmental regulations.

Selection Notes

Select this component when low-voltage operation down to 1.65V is necessary alongside 5.5V tolerant inputs. The LVC family offers high-speed performance suitable for modern digital interfaces. Consider the WQFN package size constraints and thermal dissipation capabilities relative to other available packages like SOIC or TSSOP.

Part Context

This part belongs to the SNx4LVC157A series of quadruple multiplexers manufactured by Texas Instruments. The 'A' suffix typically denotes enhanced specifications or revisions within the standard LVC157 family. The BQB suffix specifically identifies the WQFN package variant designed for surface-mount applications requiring compact footprints.

Replacement Considerations

SN74LVC157ADBR (SSOP-16)

FAQ

What is the function of the G pin?

The G pin is the output strobe input. When G is high, all outputs are low. When G is low, the selected data is routed to the outputs.

Can unused inputs be left floating?

No, all unused inputs must be connected to VCC or GND to prevent undefined operational states and excessive power consumption.