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MOTOROLA
SEMICONDUCTOR
TECHNICAL DATA
500 mW DO-35 Glass
Zener Voltage Regulator Diodes
GENERAL DATA APPLICABLE TO ALL SERIES IN
THIS GROUP
500 Milliwatt
Hermetically Sealed
Glass Silicon Zener Diodes
GENERAL
DATA
500 mW
DO-35 GLASS
GLASS ZENER DIODES
500 MILLIWATTS
1.8–200 VOLTS
Specification Features:
Complete Voltage Range — 1.8 to 200 Volts
DO-204AH Package — Smaller than Conventional DO-204AA Package
Double Slug Type Construction
Metallurgically Bonded Construction
Mechanical Characteristics:
CASE: Double slug type, hermetically sealed glass
MAXIMUM LEAD TEMPERATURE FOR SOLDERING PURPOSES: 230°C, 1/16from
case for 10 seconds
FINISH: All external surfaces are corrosion resistant with readily solderable leads
POLARITY: Cathode indicated by color band. When operated in zener mode, cathode
will be positive with respect to anode
MOUNTING POSITION: Any
WAFER FAB LOCATION: Phoenix, Arizona
ASSEMBLY/TEST LOCATION: Seoul, Korea
MAXIMUM RATINGS (Motorola Devices)*
Rating
DC Power Dissipation and TL 75°C
Lead Length = 3/8
Derate above TL = 75°C
Operating and Storage Temperature Range
* Some part number series have lower JEDEC registered ratings.
Symbol
PD
TJ, Tstg
0.7
HEAT
0.6 SINKS
0.5
0.4
3/8” 3/8”
0.3
0.2
0.1
0
0 20 40 60 80 100 120 140 160 180 200
TL, LEAD TEMPERATURE (°C)
Figure 1. Steady State Power Derating
CASE 299
DO-204AH
GLASS
Value
500
4
– 65 to +200
Unit
mW
mW/°C
°C
Motorola TVS/Zener Device Data
500 mW DO-35 Glass Data Sheet
6-97

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GENERAL DATA — 500 mW DO-35 GLASS
APPLICATION NOTE — ZENER VOLTAGE
Since the actual voltage available from a given zener diode
is temperature dependent, it is necessary to determine junc-
tion temperature under any set of operating conditions in order
to calculate its value. The following procedure is recom-
mended:
Lead Temperature, TL, should be determined from:
TL = θLAPD + TA.
θLA is the lead-to-ambient thermal resistance (°C/W) and PD is
the power dissipation. The value for θLA will vary and depends
on the device mounting method. θLA is generally 30 to 40°C/W
for the various clips and tie points in common use and for
printed circuit board wiring.
The temperature of the lead can also be measured using a
thermocouple 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 mea-
sured value of TL, the junction temperature may be deter-
mined by:
TJ = TL + TJL.
TJL is the increase in junction temperature above the lead
temperature and may be found from Figure 2 for dc power:
TJL = θJLPD.
For worst-case design, using expected limits of IZ, limits of
PD and the extremes of TJ(TJ) may be estimated. Changes in
voltage, VZ, can then be found from:
V = θVZTJ.
θVZ, the zener voltage temperature coefficient, is found from
Figures 4 and 5.
Under high power-pulse operation, the zener voltage will
vary with time and may also be affected significantly by the
zener resistance. For best regulation, keep current excursions
as low as possible.
Surge limitations are given in Figure 7. They are lower than
would be expected by considering only junction temperature,
as current crowding effects cause temperatures to be ex-
tremely high in small spots, resulting in device degradation
should the limits of Figure 7 be exceeded.
500
400
300
200
100
0
0
LL
2.4–60 V
62–200 V
0.2 0.4 0.6 0.8
L, LEAD LENGTH TO HEAT SINK (INCH)
Figure 2. Typical Thermal Resistance
1
1000
7000
5000 TYPICAL LEAKAGE CURRENT
AT 80% OF NOMINAL
2000 BREAKDOWN VOLTAGE
1000
700
500
200
100
70
50
20
10
7
5
2
1
0.7
0.5
+125°C
0.2
0.1
0.07
0.05
0.02
0.01
0.007
0.005
+25°C
0.002
0.001
3
4 5 6 7 8 9 10 11 12 13 14 15
VZ, NOMINAL ZENER VOLTAGE (VOLTS)
Figure 3. Typical Leakage Current
500 mW DO-35 Glass Data Sheet
6-98
Motorola TVS/Zener Device Data

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GENERAL DATA — 500 mW DO-35 GLASS
TEMPERATURE COEFFICIENTS
(–55°C to +150°C temperature range; 90% of the units are in the ranges indicated.)
+12
+10
+8
+6
+4
+2
0
–2
–4
2
RANGE
VZ @ IZT
(NOTE 2)
3 4 5 6 7 8 9 10 11
VZ, ZENER VOLTAGE (VOLTS)
Figure 4a. Range for Units to 12 Volts
12
100
70
50
30
20
10
7
5
3
2
1
10
RANGE
VZ @ IZ (NOTE 2)
20 30
50
VZ, ZENER VOLTAGE (VOLTS)
70
100
Figure 4b. Range for Units 12 to 100 Volts
200
180
160
140
120
VZ @ IZT
(NOTE 2)
100
120 130 140 150
160 170 180
190 200
VZ, ZENER VOLTAGE (VOLTS)
Figure 4c. Range for Units 120 to 200 Volts
+6
+4
VZ @ IZ
TA = 25°C
+2
20 mA
0
0.01 mA
1 mA
–2 NOTE: BELOW 3 VOLTS AND ABOVE 8 VOLTS
NOTE: CHANGES IN ZENER CURRENT DO NOT
–4 NOTE: AFFECT TEMPERATURE COEFFICIENTS
34
56
78
VZ, ZENER VOLTAGE (VOLTS)
Figure 5. Effect of Zener Current
1000
500
0 V BIAS
200
100
50
TA = 25°C
1 V BIAS
20
10 50% OF
5 VZ BIAS
2
1
12
5 10 20
50 100
VZ, ZENER VOLTAGE (VOLTS)
Figure 6a. Typical Capacitance 2.4–100 Volts
100
70
50
0 BIAS
30
20
1 VOLT BIAS
10
7
5 50% OF VZ BIAS
3
2
TA = 25°C
1
120 140 160 180 190 200 220
VZ, ZENER VOLTAGE (VOLTS)
Figure 6b. Typical Capacitance 120–200 Volts
Motorola TVS/Zener Device Data
500 mW DO-35 Glass Data Sheet
6-99

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GENERAL DATA — 500 mW DO-35 GLASS
100
70
50
30 5% DUTY CYCLE
20
11 V–91 V NONREPETITIVE
1.8 V–10 V NONREPETITIVE
RECTANGULAR
WAVEFORM
TJ = 25°C PRIOR TO
INITIAL PULSE
10 10% DUTY CYCLE
7
5
3 20% DUTY CYCLE
2
1
0.01 0.02
0.05 0.1 0.2
0.5 1
2
5 10 20
50 100 200
PW, PULSE WIDTH (ms)
Figure 7a. Maximum Surge Power 1.8–91 Volts
500 1000
1000
700
500
300
200
100
70
50
30
20
10
7
5
3
2
1
0.01
RECTANGULAR
WAVEFORM, TJ = 25°C
100–200 VOLTS NONREPETITIVE
0.1 1 10
PW, PULSE WIDTH (ms)
100
1000
Figure 7b. Maximum Surge Power DO-204AH
100–200 Volts
1000
500
VZ = 2.7 V
TJ = 25°C
iZ(rms) = 0.1 IZ(dc)
f = 60 Hz
200
100 47 V
50 27 V
20
10 6.2 V
5
2
1
0.1 0.2
0.5 1
2
5 10 20
50 100
IZ, ZENER CURRENT (mA)
Figure 8. Effect of Zener Current on
Zener Impedance
1000
700
500
200 IZ = 1 mA
100
70 5 mA
50
TJ = 25°C
iZ(rms) = 0.1 IZ(dc)
f = 60 Hz
20 20 mA
10
7
5
2
1
1
2 3 5 7 10
20 30 50 70 100
VZ, ZENER VOLTAGE (VOLTS)
Figure 9. Effect of Zener Voltage on Zener Impedance
1000
MAXIMUM
500 MINIMUM
200
100
50
20 75°C
10
5 150°C
25°C
2 0°C
1
0.4 0.5 0.6 0.7 0.8 0.9 1 1.1
VF, FORWARD VOLTAGE (VOLTS)
Figure 10. Typical Forward Characteristics
500 mW DO-35 Glass Data Sheet
6-100
Motorola TVS/Zener Device Data

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GENERAL DATA — 500 mW DO-35 GLASS
20
10
TA = 25°
1
0.1
0.01
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15
VZ, ZENER VOLTAGE (VOLTS)
Figure 11. Zener Voltage versus Zener Current — VZ = 1 thru 16 Volts
16
10
TA = 25°
1
0.1
0.01
15
16 17 18 19 20 21 22 23 24 25 26 27 28 29
VZ, ZENER VOLTAGE (VOLTS)
Figure 12. Zener Voltage versus Zener Current — VZ = 15 thru 30 Volts
30
Motorola TVS/Zener Device Data
500 mW DO-35 Glass Data Sheet
6-101