BA8274F-E2

Overview

The BA8274F-E2 is a dual, bi-directional I2C bus line buffer IC manufactured by ROHM Semiconductor. It extends I2C bus lines while retaining system features and operating modes. The device operates within a power supply voltage range of 4.5 V to 12 V. Typical supply current is 16 mA to 17 mA, with a maximum of 30 mA. It provides an effective current gain of approximately 10x from the I2C bus to the buffered bus, enabling drive capacity for capacitive loads up to six times the standard limit. The component is housed in an SOP-8 package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Dual, bi-directional unity voltage gain buffer compatible with I2C bus systems.
• Provides impedance transformation and extended drive capacity for long-distance bus lines.
• Logic signal levels accommodate both supply voltage and ground references.

Applications

• Mini-component stereo systems
• Micro-component stereo systems
• Television sets

Procurement Notes

Verify the specific ordering suffix E2 against the manufacturer's latest documentation to confirm pinout compatibility and RoHS status. Confirm availability as the product may be subject to discontinuation or lifecycle changes. Ensure the selected packaging format matches the required manufacturing process specifications.

Selection Notes

Select this component when extending I2C bus distance using standard wiring without degrading performance. Verify that the total system capacitance and pull-up resistor values comply with the calculated time constant requirements. Ensure the application does not require high-reliability standards such as medical or aerospace certifications.

Part Context

The BA8274F-E2 belongs to the BA8274 series of audio ICs designed for I2C bus expansion. It functions as a buffer to increase drive capability on data and clock lines. The 'F' designation indicates the SOP-8 package variant, distinguishing it from DIP packages.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult the manufacturer for direct replacements if this component is no longer recommended for new designs.

FAQ

Can either input pin be used for SDA or SCL?

Yes, because the two buffer circuits are identical, either input pin can function as the I2C BUS SDA data line or the SCL clock line.

How does the buffer handle capacitive load?

The buffer preserves the open collector/drain characteristic and allows the system to drive capacitive loads up to approximately six times the standard I2C limit on the buffered bus side.

What is the maximum pull-up current restriction?

The maximum pull-up current with the bus LOW should not exceed 3 mA for the I2C bus specification or 30 mA for the buffered bus.