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       1N5820, 1N5821, 1N5822 http://onsemi.com 5 Figure 1. Maximum Reference Temperature 1N5820 Figure 2. Maximum Reference Temperature 1N5821 Figure 3. Maximum Reference Temperature 1N5822 Figure 4. Steady-State Thermal Resistance 3.0 4.0 7.0 10 2015 75 2.0 VR, REVERSE VOLTAGE (VOLTS) 115 125 105 5.0 7.0 10 15 20 3/8 4/8 5/8 6/8 7/8 1.030 75 4.0 VR, REVERSE VOLTAGE (VOLTS) 125 115 105 95 85 L, LEAD LENGTH (INCHES) 1/8 0 0 25 20 15 10 5.0 2/8 40 T R , REFERENCE TEMPERATURE ( C) T R JL , THERMAL RESISTANCE 95 85 5.0 ° 40 35 30 JUNCTION-TO-LEAD ( C/W) ° BOTH LEADS TO HEATSINK, EQUAL LENGTH MAXIMUM TYPICAL , REFERENCE TEMPERATURE ( C) R ° RJA ( °C/W) = 70 50 40 28 20 15 10 8.0 3.0 4.0 7.0 10 2015 VR, REVERSE VOLTAGE (VOLTS) 115 105 T R , REFERENCE TEMPERATURE ( C) 95 85 75 5.0 ° RJA ( °C/W) = 70 50 40 28 20 15 10 8.0 125 30 RJA ( °C/W) = 70 50 40 28 20 15 10 8.0 r(t), TRANSIENT THERMAL RESISTANCE (NORMALIZED) 0.2 0.5 1.0 2.0 5.0 10 20 50 100 200 500 1.0 k 2.0 k 5.0 k 10 k 0.05 0.03 0.02 0.01 0.1 t, TIME (ms) 0.5 0.3 0.2 1.0 LEAD LENGTH = 1/4″ Ppk Ppk tp t1 TIME DUTY CYCLE = tp/t1 PEAK POWER, Ppk, is peak of an equivalent square power pulse. TJL = P pk ? R JL [D + (1 - D) ? r(t 1 + t p) + r(tp) - r(t1)] where: TJL = the increase in junction temperature above the lead temperature. r(t) = normalized value of transient thermal resistance at time, t, i.e.: r(t1 + t p) = normalized value of transient thermal resistance at time t1 + t p, etc. Figure 5. Thermal Response 20 k The temperature of the lead should be measured using a ther‐ mocouple placed on the lead as close as possible to the tie point. The thermal mass connected to the tie point is normally large enough so that it will not significantly respond to heat surges generated in the diode as a result of pulsed operation once steady-state conditions are achieved. Using the measured value of TL, the junction temperature may be determined by: TJ = T L + TJL |