5.6 Safety Limiting Values

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

SO-4 PACKAGE (DFG)

IS

Safety limiting input current

RθJA= 283.9℃/W, VF = 1.4V, TJ = 150℃,

TA = 25℃

300

mA

RθJA=283.9℃/W, VCEO = 40V, TJ = 150℃,

TA = 25℃

10.5

mA

RθJA= 283.9℃/W, VCEO = 24V, TJ =150℃,

TA = 25℃

17.5

mA

RθJA= 283.9℃/W, VCEO = 15V, TJ =

150

℃, TA = 25℃

28

mA

PS

Safety limiting total power

RθJA= 283.9℃/W, TJ = 150℃, TA = 25℃

420

mW

TS

Maximum safety temperature

150

℃

(1)

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

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

The junction-to-air thermal resistance, RθJA, in the 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.

ISOS510-SP

SLVSJM3 – MAY 2026

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