SN74LV138AQWBQBRQ1

Overview

The SN74LV138AQWBQBRQ1 is an automotive-grade 3-line to 8-line decoder or demultiplexer from Texas Instruments. It operates within a supply voltage range of 2 V to 5.5 V and supports mixed-mode voltage operation on all ports. The device features three enable inputs (two active-low, one active-high) to facilitate system expansion without external logic gates. It includes Ioff circuitry for partial-power-down mode support and meets AEC-Q100 standards with a temperature grade of 1 (-40°C to +125°C).

Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades.
• Supports mixed-mode voltage operation across all input and output ports.
• Includes Ioff circuitry to prevent damaging current backflow during partial-power-down states.
• Features wettable flanks on the WQFN package to improve solder joint inspection reliability.

Applications

• Output expansion in automotive systems
• LED matrix control
• 7-segment display control
• 8-bit data storage

Procurement Notes

Verify that the specific ordering suffix matches the required package type and reel specifications. Confirm compliance with RoHS directives and REACH regulations before integration. Ensure the design accounts for the recommended operating conditions regarding input transition rates to prevent oscillations. Validate thermal performance against the junction-to-ambient resistance values provided in the datasheet.

Selection Notes

Select this component when designing automotive circuits requiring low-voltage operation down to 2 V. The balanced CMOS push-pull outputs are suitable for driving loads up to 50 pF capacitance while minimizing ringing. Consider the three enable inputs for complex decoding hierarchies that require minimal external gate usage. Ensure unused inputs are terminated to VCC or GND to maintain stable logic states.

Part Context

This part belongs to the SN74LV138A-Q1 family of decoders designed for high-performance memory-decoding and data-routing applications. It is manufactured by Texas Instruments and utilizes a 16-pin WQFN package. The device is optimized for short propagation delays, making it effective in high-speed memory systems where decoder delay must be negligible relative to memory access times.

Replacement Considerations

Consult the official datasheet orderable addendum for alternative packages of the SN74LV138A-Q1 series. Verify pin compatibility and electrical characteristics against other members of the LV logic family if substituting components.