BUF634AIDDAR

Overview

The BUF634AIDDAR is a high-speed, unity-gain buffer manufactured by Texas Instruments in an 8-pin HSOIC package with a thermal pad. It operates on a supply voltage range of ±2.25 V to ±18 V (4.5 V to 36 V total). The device provides a continuous output current of ±250 mA and features a slew rate of 3750 V/µs. Its bandwidth is adjustable from 35 MHz to 210 MHz via an external resistor between the BW and V– pins. In low-quiescent current mode, it consumes 1.5 mA; in wide-bandwidth mode, it consumes 8.5 mA. It includes internal output current limiting and thermal shutdown protection.

Feature Summary

• Adjustable bandwidth ranging from 35 MHz to 210 MHz controlled by an external resistor
• High-fidelity open-loop buffer capable of driving up to 250 mA of output current
• Integrated thermal shutdown and internal output current limit for rugged operation
• Low quiescent current consumption of 1.5 mA in low-power mode

Applications

• Memory systems
• Semiconductor testers
• Headphone drivers
• Flight control systems
• Capacitive load drivers

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the BUF634A family includes SOIC, VSON, and HSOIC variants. Confirm the bandwidth configuration requirements before procurement, as performance varies significantly between the low-quiescent current and wide-bandwidth modes based on the external resistor connected to the BW pin.

Selection Notes

Select this component when high output current drive and fast transient response are required. The HSOIC package offers improved thermal performance compared to standard SOIC due to the exposed thermal pad. Ensure the application can accommodate the adjustable bandwidth feature or configure the BW pin appropriately for the desired frequency response and power consumption trade-off.

Part Context

The BUF634A is part of Texas Instruments' high-speed buffer family designed for applications requiring large output current and high fidelity. It serves as a standalone driver or complements precision operational amplifiers in composite loops to enhance current drive capabilities while maintaining signal integrity. The device is rated for extended industrial temperature operation from -40°C to +125°C.

Replacement Considerations

The BUF634AIDR is a direct replacement offering identical electrical characteristics in a standard SOIC-8 package without the thermal pad found in the DDA variant.