SN74ACT240QDGSRQ1

Overview

The SN74ACT240QDGSRQ1 is an automotive-grade octal buffer or driver with 3-state outputs, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature from -40°C to +125°C. The device features two banks of four inverting drivers, each with a shared output enable pin. It provides continuous ±24mA output drive at 5V and supports up to ±75mA in short bursts. Maximum propagation delay is 9.6ns at 5V with a 50pF load.

Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classification levels.
• Balanced CMOS 3-state outputs capable of driving high, low, and high-impedance states.
• TTL-compatible CMOS inputs designed to interface directly with TTL logic devices.
• Available in VSSOP package with wettable flanks to improve side wetting and facilitate automatic optical inspection.

Applications

• Smartphone handset circuits
• Network switch signal buffering
• Health and fitness wearable devices

Procurement Notes

Verify the specific ordering suffix 'DGS' corresponds to the VSSOP-20 package configuration required for your design. Confirm that the Q1 suffix indicates AEC-Q100 qualification suitable for automotive environments. Ensure the reel quantity matches your production needs, as this part number is typically supplied in large tape-and-reel formats. Cross-reference the manufacturer's latest orderable information to confirm current availability and lead times before finalizing procurement plans.

Selection Notes

Select this component when designing automotive systems requiring octal bus buffering with inverting logic functions. It is suitable for applications needing 3-state outputs to manage bus contention on data lines. Consider the VSSOP package if space constraints require a compact footprint with improved solder joint inspectability via wettable flanks. Ensure the system operates within the 4.5V to 5.5V supply range and meets the thermal requirements for the -40°C to +125°C environment.

Part Context

This device belongs to the SN74ACT240-Q1 family of automotive octal buffers and drivers. It shares functional similarities with other ACT series logic components but is specifically optimized for automotive reliability standards. The Q1 designation signifies compliance with AEC-Q100 guidelines, distinguishing it from standard commercial grade counterparts while maintaining compatible electrical characteristics for direct replacement in many designs.

Replacement Considerations

SN74ACT240QPWRQ1 (TSSOP-20 package)

FAQ

How are unused inputs handled in the SN74ACT240QDGSRQ1?

Unused inputs must not be left floating. They should be terminated to either VCC or ground using a pull-up or pull-down resistor, typically 10kΩ, to prevent oscillations and excessive power consumption.

What is the maximum capacitive load recommended for optimal performance?

The device can drive a load with total capacitance less than or equal to 50pF while meeting all datasheet specifications. Exceeding this value is not recommended for optimal performance.