1N4728A Series
a. Range for Units to 12 Volts
b. Range for Units to 12 to 100 Volts
100
70
+12
+10
+8
50
30
20
+6
+4
+2
0
RANGE
V Ă@ĂI
Z ZT
10
7
5
V Ă@ĂI
Z
ZT
RANGE
3
2
-2
-4
1
2
3
4
5
6
7
8
9
10
11 12
10
20
30
50
70 100
V , ZENER VOLTAGE (VOLTS)
Z
V , ZENER VOLTAGE (VOLTS)
Z
Figure 2. Temperature Coefficients
(–55°C to +150°C temperature range; 90% of the units are in the ranges indicated.)
+6
175
150
125
100
75
V Ă@ĂI
Z
Z
+4
+2
T Ă=Ă25°C
A
20ĂmA
0
0.01ĂmA
50
1ĂmA
-2
-4
NOTE: BELOW 3 VOLTS AND ABOVE 8 VOLTS
NOTE: CHANGES IN ZENER CURRENT DO NOT
NOTE: EFFECT TEMPERATURE COEFFICIENTS
25
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8 0.9
1
3
4
5
6
7
8
L, LEAD LENGTH TO HEAT SINK (INCHES)
V , ZENER VOLTAGE (VOLTS)
Z
Figure 3. Typical Thermal Resistance
versus Lead Length
Figure 4. Effect of Zener Current
100
70
RECTANGULAR
WAVEFORM
T Ă=Ă25°C PRIOR TO
J
INITIAL PULSE
50
11ĂV-100ĂV NONREPETITIVE
3.3ĂV-10ĂV NONREPETITIVE
30
20
5% DUTY CYCLE
10
7
10% DUTY CYCLE
5
20% DUTY CYCLE
3
2
1
0.01 0.02
0.05
0.1
0.2
0.5
1
2
5
10
20
50
100
200
500 1000
PW, PULSE WIDTH (ms)
This graph represents 90 percentile data points.
For worst case design characteristics, multiply surge power by 2/3.
Figure 5. Maximum Surge Power
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