TPA8801B-TR

Overview

The TPA8801B is a high sensitivity current input interface designed to convert picoampere to nanoampere range signals into a voltage output. It features an internal amplifier with a typical input bias current of 1pA and a maximum offset voltage of ±3mV. The device operates on a supply voltage ranging from 2.1V to 5.5V, consuming a maximum supply current of 700µA. It provides an analog output and includes internal filtering capabilities. The component is specified for operation in temperatures from –40°C to 125°C and is available in a 14-TSSOP package.

Feature Summary

• High transimpedance gain: Ideal DC gain reaches 4.56GΩ when Rg=20KΩ
• Low noise performance: Input voltage noise density of 25 nV/√Hz
• Single resistor gain setting: Gain is configured via one external resistor (Rg)
• Robust ESD protection: HBM rating of 8kV and CDM rating of 2kV

Applications

• Dust sensors for air quality monitoring (PM2.5, PM10)
• Photodiode interface circuits
• Current output sensor interfaces

Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm packaging details. The standard tape and reel quantity is 3,000 units. Ensure that the design accounts for the absolute maximum ratings, particularly regarding input voltage limits relative to the power supply rails to prevent damage.

Selection Notes

Select this component for applications requiring the amplification of extremely low current signals, such as those from photodiodes in dust sensors. The AC coupled mode is recommended to remove DC offset voltages and bias current impacts. Designers should calculate the passband based on the pulse width of the signal source, as the actual AC gain depends on capacitor values used for filtering.

Part Context

The TPA8801B belongs to the specialized IC category within the 3PEAK portfolio, focusing on signal chain solutions. It is distinct from general-purpose operational amplifiers due to its integrated transimpedance architecture and specific filtering blocks. The device is intended for industrial and consumer sensing applications where high sensitivity and low power consumption are critical.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Direct replacement requires verifying pin compatibility, gain characteristics, and package dimensions with alternative manufacturers' components.