1N5817 1N5818 1N5819

4

Rectifier Device Data

100

70

5.0

125

115

105

95

85

75

20

7.0

10

3.0

2.0

30

1.0

40

15

5.0

3.0

2.0

0.3

0.2

0.1

40

36

12

30

20

1.0

0.5

0.05

0.03

24

16

20

8.0

4.0

28

032

10

20

7.0

5.0

2.0

0.2

0.3

0.5

0.7

1.0

3.0

0.9

1.0

1.1

0.1

0.07

0.05

0.03

0.02

0.6

0.5

0.4

0.3

0.2

0.7

0.1

0.8

NOTE 3 — THERMAL CIRCUIT MODEL

(For heat conduction through the leads)

TA(A)

TA(K)

R

θS(A)

R

θL(A)

R

θJ(A)

R

θJ(K)

R

θL(K)

R

θS(K)

PD

TL(A)

TC(A)

TJ

TC(K)

TL(K)

vF, INSTANTANEOUS FORWARD VOLTAGE (VOLTS)

Figure 7. Typical Forward Voltage

NUMBER OF CYCLES

Figure 8. Maximum Non–Repetitive Surge Current

VR, REVERSE VOLTAGE (VOLTS)

Figure 9. Typical Reverse Current

TC = 100°C

25

°C

1 Cycle

TL = 70°C

f = 60 Hz

Surge Applied at

Rated Load Conditions

1N5817

1N5818

1N5819

TJ = 125°C

100

°C

25

°C

Use of the above model permits junction to lead thermal resistance

for any mounting configuration to be found. For a given total lead

length, lowest values occur when one side of the rectifier is brought

as close as possible to the heatsink. Terms in the model signify:

TA = Ambient Temperature

TC = Case Temperature

TL = Lead Temperature

TJ = Junction Temperature

R

θS = Thermal Resistance, Heatsink to Ambient

R

θL = Thermal Resistance, Lead to Heatsink

R

θJ = Thermal Resistance, Junction to Case

PD = Power Dissipation

(Subscripts A and K refer to anode and cathode sides, respectively.)

Values for thermal resistance components are:

R

θL = 100°C/W/in typically and 120°C/W/in maximum

R

θJ = 36°C/W typically and 46°C/W maximum.

75

°C