Datasheet 1N5817, 1N5818, 1N5819 (ON Semiconductor) - 5

1N5817, 1N5818, 1N5819 NOTE 5. — THERMAL CIRCUIT MODEL
(For heat conduction through the leads) RqS(A) RqL(A) RqJ(A) RqJ(K) RqL(K) RqS(K) TA(A) T P A(K) D TL(A) TC(A) TJ TC(K) TL(K) Use of the above model permits junction to lead thermal re- (Subscripts A and K refer to anode and cathode sides, re- sistance for any mounting configuration to be found. For a spectively.) Values for thermal resistance components are: given total lead length, lowest values occur when one side of RqL = 100°C/W/in typically and 120°C/W/in maximum the rectifier is brought as close as possible to the heatsink. RqJ = 36°C/W typically and 46°C/W maximum. Terms in the model signify: TA = Ambient Temperature TC = Case Temperature TL = Lead Temperature TJ = Junction Temperature RqS = Thermal Resistance, Heatsink to Ambient RqL = Thermal Resistance, Lead to Heatsink RqJ = Thermal Resistance, Junction to Case PD = Power Dissipation 30 20 1 Cycle 20 (AMP) TL = 70°C f = 60 Hz 10 10 7.0 TC = 100°C 7.0 5.0 (AMP) , PEAK SURGE CURRENT 5.0 3.0 Surge Applied at I FSM 2.0 Rated Load Conditions 25°C 3.0 CURRENT 1.0 2.0 3.0 5.0 7.0 10 20 30 40 70 100 ARD NUMBER OF CYCLES W 1.0 FOR 0.7
Figure 8. Maximum Non−Repetitive Surge Current
0.5 30 ANEOUS 20 TJ = 125°C 0.3 ANT 15 0.2 (mA) , INST 5.0 100°C i F 3.0 2.0 0.1 75°C 1.0 0.07 0.5 0.05 0.3 25°C , REVERSE CURRENT I R 0.2 0.03 0.1 1N5817 1N5818 0.02 0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1N5819 0.03 0 4.0 8.0 12 16 20 24 28 32 36 40 vF, INSTANTANEOUS FORWARD VOLTAGE (VOLTS) VR, REVERSE VOLTAGE (VOLTS)
Figure 7. Typical Forward Voltage Figure 9. Typical Reverse Current http://onsemi.com 5