TIINA199A1 Current Sense Amplifier
Overview
The INA199A1 is a bidirectional current sense amplifier from Texas Instruments. It measures the small voltage drop across a shunt resistor and converts it into an output voltage that is easier for an MCU, ADC, or comparator to read. The part is intended for high-side or low-side current monitoring in compact analog front ends.
Why Choose This Part
INA199A1 is useful when you need a simple analog current-sense signal without adding a dedicated current-sense ADC or digital interface. It supports bidirectional sensing, which makes it practical for systems that both source and sink current, such as battery and motor applications. The small SOT-23 style package also fits space-constrained designs.
Applications
Getting Started
Place the shunt resistor in the current path and route Kelvin connections from the shunt to the amplifier inputs to avoid layout error. Then connect the output to an ADC channel or comparator input and validate the transfer function in firmware or at the system level. For evaluation, use a TI EVM or build a small shunt-and-amplifier test fixture on a proto board, then confirm zero-current offset and full-scale behavior against a known load.
INA199A1 Family
Comparing specs that differ across variants. The current part is highlighted.
| Part Number | Package | Stock |
|---|---|---|
| INA199A1DCKT (this part) | — | 39,482 |
| INA199A1DCKR | TSSOP-6 | 28,653 |
| INA199A1RSWT | UFQFN-10 | 16 |
