ASSR-1218 Datasheet, PDF (11/12 Pages) AVAGO TECHNOLOGIES LIMITED – Compact Solid-State Bi-directional Signal Switch

Application Information
On-Resistance and Derating Curves
The Output On-Resistance, R_(ON), specified in this data
sheet, is the resistance measured across the output con-
tact when a pulse current signal (lo=200mA) is applied
to the output pins. The use of a pulsed signal (≤30ms)
implies that each junction temperature is equal to the
ambient and case temperatures. The steady-state resis-
tance, Rss, on the other hand, is the value of resistance
measured across the output contact when a DC current
signal is applied to the output pins for a duration suf-
ficient to reach thermal equilibrium. Rss includes the ef-
fects of the temperature rise in the device.
Figure 1, 2, 3 and 4 specify the maximum average out-
put current allowable for a given ambient temperature.
The maximum allowable output current and power dis-
sipation are related by the expression Rss = Po(max)/
(lo(max))² from which Rss can be calculated. Staying
within the safe area assures that the steady state MOS-
FET junction temperature remains less than 125 °C.
I_F = 10mA, 4-Layer Board
0.2
0.15
Safe
0.1
Operating
Area
0.05
0
-40 -20
0
20 40
60
80 100
T_A - TEMPERATURE - ˚C
Figure 1. Maximum Output Current Rating vs Ambient Temperature
(ASSR-1218-003E)
0.5
I_F = 10mA, 4-Layer Board
0.4
0.3
Safe
Operating
0.2
Area
0.1
0
-40 -20
0
20 40
60
80 100
T_A - TEMPERATURE - ˚C
Figure 3. Maximum Output Current Rating vs Ambient Temperature
(ASSR-1219-001E DC Connection)
I_F = 10mA, 4-Layer Board
0.2
0.15
Safe
0.1
Operating
Area
0.05
0
-40 -20
0
20 40
60
80 100
T_A - TEMPERATURE - ˚C
Figure 2. Maximum Output Current Rating vs Ambient Temperature
(ASSR-1219-001E)
I_F = 10mA, 4-Layer Board
0.2
0.15
1-Channel & 2-Channel
Safe
0.1
Operating
Area
0.05
0
-40 -20
0
20 40
60
80 100
T_A - TEMPERATURE - ˚C
Figure 4. Maximum Output Current Rating vs Ambient Temperature
(ASSR-1228-002E)
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