are satisfied with a 10-Ω resistor along with conventional Zener diodes of the lowest power rating that can be

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

small as SOT-523 or SOD-523. See TIDA-00302 Transient Robustness for Current Shunt Monitor Design Guide,

TIDU473 for more information on transient robustness and current-shunt monitor input protection.

V+

OUT

GND

IN-

IN+

C

BYPASS

Shutdown

Control

REF

Reference

Voltage

Supply

Load

R

SHUNT

Output

1 MW

R

PROTECT

10 W

R

PROTECT

10 W

R

3

1 MW

R

4

Figure 7-5. INA199 Transient Protection Using Dual Zener Diodes

In the event that low-power zeners do not have sufficient transient absorption capability and a higher power

transzorb must be used, the most package-efficient solution then involves using a single transzorb and back-to-

back diodes between the device inputs. The most space-efficient solutions are dual series-connected diodes in a

single SOT-523 or SOD-523 package. This method is shown in Figure 7-6. In either of these examples, the total

board area required by the INA199 with all protective components is less than that of an SO-8 package, and only

slightly greater than that of an MSOP-8 package.

V+

OUT

GND

IN-

IN+

C

BYPASS

Shutdown

Control

REF

Reference

Voltage

Supply

Load

R

SHUNT

Output

1 MW

R

PROTECT

10 W

R

PROTECT

10 W

R

3

1 MW

R

4

Figure 7-6. INA199 Transient Protection Using a Single Transzorb and Input Clamps

INA199

SBOS469H – APRIL 2009 – REVISED OCTOBER 2023

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