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SLLSFC3A March 2020 – December 2021 ISO1640-Q1

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6.7 Safety Limiting Values

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

PARAMETER		TEST CONDITIONS	MAX	UNIT
D-8 PACKAGE
I_S	Safety input, output, or supply current⁽¹⁾	R_θJA = 106.3 °C/W, V_I = 5.5 V, T_J = 150°C, T_A = 25°C, see Figure 6-1	214	mA
I_S	Safety input, output, or supply current⁽¹⁾	R_θJA = 106.3 °C/W, V_I = 3.6 V, T_J = 150°C, T_A = 25°C, see Figure 6-1	327	mA
P_S	Safety input, output, or total power⁽¹⁾	R_θJA = 106.3 °C/W, T_J = 150°C, T_A = 25°C, see Figure 6-2	1176	mW
T_S	Safety temperature⁽¹⁾		150	°C
DW-16 PACKAGE
I_S	Safety input, output, or supply current⁽¹⁾	R_θJA = 62.4 °C/W, V_I = 5.5 V, T_J = 150°C, T_A = 25°C, see Figure 6-3	365	mA
I_S	Safety input, output, or supply current⁽¹⁾	R_θJA = 62.4 °C/W, V_I = 3.6 V, T_J = 150°C, T_A = 25°C, see Figure 6-3	557	mA
P_S	Safety input, output, or total power⁽¹⁾	R_θJA = 62.4 °C/W, T_J = 150°C, T_A = 25°C, see Figure 6-4	2004	mW
T_S	Safety temperature⁽¹⁾		150	°C

(1) The maximum safety temperature, T_S, has the same value as the maximum junction temperature, T_J, specified for the device. The I_S and P_S parameters represent the safety current and safety power respectively. The maximum limits of I_S and P_S should not be exceeded. These limits vary with the ambient temperature, T_A.

The junction-to-air thermal resistance, R_θJA, 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:

T_J = T_A + R_θJA × P, where P is the power dissipated in the device.

T_J(max) = T_S = T_A + R_θJA × P_S, where T_J(max) is the maximum allowed junction temperature.

P_S = I_S × V_I, where V_I is the maximum input voltage.

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6.7 Safety Limiting Values