Safety limiting(1) intends to minimize potential damage to the isolation barrier upon failure of input or output circuitry.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IS

Safety input, output, or supply current (1)

RθJA =137.7°C/W, VI = 5.5 V, TJ = 150°C,

TA = 25°C, see Figure 6-5

165

mA

RθJA = 137.7°C/W, VI = 3.6 V, TJ = 150°C,

TA = 25°C, see Figure 6-5

252

RθJA = 137.7°C/W, VI = 2.75 V, TJ =

150°C, TA = 25°C, see Figure 6-5

330

PS

Safety input, output, or total power (1)

RθJA = 137.7°C/W, TJ = 150°C, TA =

25°C, see Figure 6-6

908

mW

TS

Maximum safety temperature (1)

150

°C

(1)

The maximum safety temperature, TS, has the same value as the maximum junction temperature, TJ, specified for the device. The

IS and PS parameters represent the safety current and safety power respectively. The maximum limits of IS and PS should not be

exceeded. These limits vary with the ambient temperature, TA.

The junction-to-air thermal resistance, RθJA, in Section 6.4 is that of a device installed on a high-K test board for leaded surface-mount

packages. Use these equations to calculate the value for each parameter:

TJ = TA + RθJA × P, where P is the power dissipated in the device.

TJ(max) = TS = TA + RθJA × PS, where TJ(max) is the maximum allowed junction temperature.

PS = IS × VI, where VI is the maximum input voltage.

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ISO7720, ISO7721

SLLSEP3G – NOVEMBER 2016 – REVISED MAY 2024

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