GND

OUT

ALERT2

IN+

IN-

LOAD

Power Supply

0 V to 36 V

+

Gain = 20,

50, 100

LATCH1

RLIMIT2

LIMIT2

ALERT1

VS

2.7 V to 5.5 V

RPULL-UP2

+

+

DELAY

CDELAY

RLIMIT1

LIMIT1

LATCH2

Reference

Voltage

REF

RPULL-UP1

ILIMIT1

ILIMIT2

CBYPASS

0.1 PF

10 k:

10 k:

RPROTECT

< 10 :

RSENSE

28

INA302, INA303

SBOS775C – SEPTEMBER 2016 – REVISED MARCH 2019

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8.1.3 Using the INA30x With Common-Mode Transients Greater Than 36 V

With a small amount of additional circuitry, these devices can be used in circuits subject to transients higher than

36 V. Use only zener diodes or zener-type transient absorbers (sometimes referred to as transzorbs). Any other

type of transient absorber has an unacceptable time delay. Start by adding a pair of resistors as a working

impedance for the zener diode, as shown in Figure 51. Keep these resistors as small as possible, preferably 10

Ω or less. Larger values can be used with an additional induced error resulting from a reduced signal that

actually reaches the device input pins. Many applications are satisfied with a 10-

Ω resistor along with

conventional zener diodes of the lowest power rating available because this circuit limits only short-term

transients. This combination uses the least amount of board space. These diodes can be found in packages as

small as SOT-523 or SOD-523.

Figure 51. Transient Protection