INA745AIRELR datasheet(13/50 Pages) TI2

13 / 50 page

Temperature (C)

-50

-25

100

125

150

0.4

0.6

0.8

1.2

1.4

1.6

1.8

Figure 6-1. IS+ to IS– Package Resistance vs Temperature

The internal compensation of the INA745x corrects for pin-to-pin resistance increases with temperature,

achieving low drift over the ambient temperature range.

The INA745x is most accurate when measuring currents around 15A to 20A. As currents increase, the error in

the current measurement also increases. Figure 6-2 shows how the gain error of the INA745x varies with the

shunt current for all device options.

Shunt Current (A)

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

0.6

Figure 6-2. Gain Error vs Shunt Current

The shape of this curve varies based on the PCB design. Designs with better thermal performance typically

flatten this curve.

The temperature coefficient of the shunt is compensated by sampling the junction temperature and internally

applying a correction factor based on this temperature to the reported current measurements. During transient

currents, the shunt heats faster than the temperature sensor. This temporary difference in temperatures results

in higher values in the reported current until the temperature stabilizes. Figure 6-3 shows the sampled output

response during a current step from 0A to 22.5A

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INA745A, INA745B

SBOSAC3B – JULY 2023 – REVISED AUGUST 2025

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