Case Temperature (GC)

0

50

100

150

200

0

100

200

300

400

D011

VCC1 = VCC2 = 3.6 V

VCC1 = VCC2 = 5.5 V

ISO7320C, ISO7320FC, ISO7321C, ISO7321FC

www.ti.com

SLLSEK8C – JANUARY 2015 – REVISED APRIL 2015

8.3.1.4 Safety Limiting Values

Safety limiting intends to prevent 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

RθJA = 121 °C/W, VI = 5.5 V, TJ = 150°C, TA = 25°C

188

Safety input, output, or supply

IS

mA

current

RθJA = 121 °C/W, VI = 3.6 V, TJ = 150°C, TA = 25°C

287

TS

Maximum case temperature

150

°C

The safety-limiting constraint is the absolute-maximum junction temperature specified in the Absolut Maximun

Ratings table. The power dissipation and junction-to-air thermal impedance of the device installed in the

application hardware determines the junction temperature. The assumed junction-to-air thermal resistance in the

Thermal Information table is that of a device installed on a High-K Test Board for Leaded Surface-Mount

Packages. The power is the recommended maximum input voltage times the current. The junction temperature is

then the ambient temperature plus the power times the junction-to-air thermal resistance.

Figure 15.

θJC Thermal Derating Curve per DIN V VDE V 0884-10

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