5.8 Safety Limiting Values

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

of the I/O can allow low resistance to ground or the supply and, without current limiting, dissipate sufficient power to overheat

the die and damage the isolation barrier potentially leading to secondary system failures.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

DW-16 PACKAGE

IS

Safety input, output, or supply

current

RθJA =94.4°C/W, VI = 5.5 V, TJ = 150°C, TA =

25°C, see Figure 5-1

241

mA

RθJA = 94.4°C/W, VI = 3.6 V, TJ = 150°C, TA =

25°C, see Figure 5-1

368

RθJA = 94.4°C/W, VI = 2.75 V, TJ = 150°C, TA

= 25°C, see Figure 5-1

482

PS

Safety input, output, or total

power

RθJA = 94.4°C/W, TJ = 150°C, TA = 25°C,

see Figure 5-2

1324

mW

TS

Maximum safety temperature

150

°C

D-8 PACKAGE

IS

Safety input, output, or supply

current (1)

RθJA =146.1°C/W, VI = 5.5 V, TJ = 150°C, TA

= 25°C, see Figure 5-3

156

mA

RθJA = 146.1°C/W, VI = 3.6 V, TJ = 150°C, TA

= 25°C, see Figure 5-3

238

RθJA = 146.1°C/W, VI = 2.75 V, TJ = 150°C,

TA = 25°C, see Figure 5-3

311

PS

Safety input, output, or total

power (1)

RθJA = 146.1°C/W, TJ = 150°C, TA = 25°C,

see Figure 5-4

856

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 the Section 5.4 table 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.

ISO7710

SLLSER9E – NOVEMBER 2016 – REVISED DECEMBER 2024

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