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MOTOROLA
SEMICONDUCTOR
TECHNICAL DATA
1 to 3 Watt DO-41 Surmetic 30
Zener Voltage Regulator Diodes
GENERAL DATA APPLICABLE TO ALL SERIES IN
THIS GROUP
1 to 3 Watt Surmetic 30
Silicon Zener Diodes
. . . a complete series of 1 to 3 Watt Zener Diodes with limits and operating characteristics
that reflect the superior capabilities of silicon-oxide-passivated junctions. All this in an
axial-lead, transfer-molded plastic package offering protection in all common environmen-
tal conditions.
Specification Features:
Surge Rating of 98 Watts @ 1 ms
Maximum Limits Guaranteed On Up To Six Electrical Parameters
Package No Larger Than the Conventional 1 Watt Package
Mechanical Characteristics:
CASE: Void-free, transfer-molded, thermosetting plastic
FINISH: All external surfaces are corrosion resistant and leads are readily solderable
POLARITY: Cathode indicated by color band. When operated in zener mode, cathode
will be positive with respect to anode
MOUNTING POSITION: Any
WEIGHT: 0.4 gram (approx)
WAFER FAB LOCATION: Phoenix, Arizona
ASSEMBLY/TEST LOCATION: Seoul, Korea
GENERAL
DATA
1–3 WATT
DO-41
SURMETIC 30
1 TO 3 WATT
ZENER REGULATOR
DIODES
3.3–400 VOLTS
CASE 59-03
DO-41
PLASTIC
MAXIMUM RATINGS
Rating
DC Power Dissipation @ TL = 75°C
Lead Length = 3/8
Derate above 75°C
DC Power Dissipation @ TA = 50°C
Derate above 50°C
Operating and Storage Junction Temperature Range
Symbol
PD
PD
TJ, Tstg
Value
3
24
1
6.67
– 65 to +200
Unit
Watts
mW/°C
Watt
mW/°C
°C
5
L = LEAD LENGTH
L = 1/8
TO HEAT SINK
4
L = 3/8
3
2 L = 1
1
0
0 20 40 60 80 100 120 140 160 180 200
TL, LEAD TEMPERATURE (°C)
Figure 1. Power Temperature Derating Curve
Motorola TVS/Zener Device Data
1–3 Watt DO-41 Surmetic 30 Data Sheet
6-43

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GENERAL DATA — 1-3 WATT DO-41 SURMETIC 30
30
20 D =0.5
10
7 0.2
5
0.1
3
2 0.05
0.02
1
0.7 0.01
0.5 D = 0
0.3
0.0001 0.0002
PPK t1
t2
DUTY CYCLE, D =t1/t2
0.0005
0.001
NOTE: BELOW 0.1 SECOND, THERMAL
RESPONSE CURVE IS APPLICABLE
TO ANY LEAD LENGTH (L).
SINGLE PULSE TJL = θJL (t)PPK
REPETITIVE PULSES TJL = θJL (t,D)PPK
0.002
0.005 0.01 0.02
0.05 0.1
t, TIME (SECONDS)
0.2
0.5 1
2
5 10
Figure 2. Typical Thermal Response L, Lead Length = 3/8 Inch
1K
RECTANGULAR
500 NONREPETITIVE
WAVEFORM
300 TJ = 25°C PRIOR
200 TO INITIAL PULSE
100
50
30
20
10
0.1 0.2 0.3 0.5
1 2 3 5 10 20 30 50 100
PW, PULSE WIDTH (ms)
Figure 3. Maximum Surge Power
3
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.005
0.002
0.001
0.0005
0.0003
1
TA = 125°C
TA = 125°C
2 5 10 20 50 100 200 400 1000
NOMINAL VZ (VOLTS)
Figure 4. Typical Reverse Leakage
APPLICATION NOTE
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 = θLA PD + 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
30–40°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
1–3 Watt DO-41 Surmetic 30 Data Sheet
6-44
TJL is the increase in junction temperature above the lead
temperature and may be found from Figure 2 for a train of
power pulses (L = 3/8 inch) or from Figure 10 for dc power.
TJL = θJL PD
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 = θVZ TJ
θVZ, the zener voltage temperature coefficient, is found from
Figures 5 and 6.
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.
Data of Figure 2 should not be used to compute surge capa-
bility. Surge limitations are given in Figure 3. They are lower
than would be expected by considering only junction tempera-
ture, as current crowding effects cause temperatures to be ex-
tremely high in small spots resulting in device degradation
should the limits of Figure 3 be exceeded.
Motorola TVS/Zener Device Data

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GENERAL DATA — 1-3 WATT DO-41 SURMETIC 30
TEMPERATURE COEFFICIENT RANGES
(90% of the Units are in the Ranges Indicated)
10 1000
8 500
6
200
4
100
2 RANGE
50
0
–2 20
–4
34
5 6 7 8 9 10
VZ, ZENER VOLTAGE @ IZT (VOLTS)
11
12
Figure 5. Units To 12 Volts
10
10 20
50
100 200
400
1000
VZ, ZENER VOLTAGE @ IZT (VOLTS)
Figure 6. Units 10 To 400 Volts
ZENER VOLTAGE versus ZENER CURRENT
(Figures 7, 8 and 9)
100 100
50 50
30 30
20 20
10 10
55
33
22
11
0.5 0.5
0.3 0.3
0.2 0.2
0.1
01
2 3 4 5 6 7 8 9 10
VZ, ZENER VOLTAGE (VOLTS)
0.1
0 10 20 30 40 50 60 70 80 90 100
VZ, ZENER VOLTAGE (VOLTS)
Figure 7. VZ = 3.3 thru 10 Volts
Figure 8. VZ = 12 thru 82 Volts
10
5
2
1
0.5
0.2
0.1
100
150 200 250 300 350 400
VZ, ZENER VOLTAGE (VOLTS)
Figure 9. VZ = 100 thru 400 Volts
80
70
60
50
40 L L
30
20 TL
PRIMARY PATH OF
10 CONDUCTION IS THROUGH
THE CATHODE LEAD
0
0 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1
L, LEAD LENGTH TO HEAT SINK (INCH)
Figure 10. Typical Thermal Resistance
Motorola TVS/Zener Device Data
1–3 Watt DO-41 Surmetic 30 Data Sheet
6-45

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GENERAL DATA — 1-3 WATT DO-41 SURMETIC 30
*MAXIMUM RATINGS
Rating
DC Power Dissipation @ TL = 75°C, Lead Length = 3/8
Derate above 75°C
Symbol
PD
Value
1.5
12
Unit
Watts
mW/°C
*ELECTRICAL CHARACTERISTICS (TL = 30°C unless otherwise noted. VF = 1.5 Volts Max @ lF = 200 mAdc for all types.)
Motorola
Type
Number
(Note 1)
1N5913B
1N5914B
1N5915B
1N5916B
1N5917B
1N5918B
1N5919B
1N5920B
1N5921B
1N5922B
1N5923B
1N5924B
1N5925B
1N5926B
1N5927B
1N5928B
1N5929B
1N5930B
1N5931B
1N5932B
1N5933B
1N5934B
1N5935B
1N5936B
1N5937B
1N5938B
1N5939B
1N5940B
1N5941B
1N5942B
1N5943B
1N5944B
1N5945B
1N5946B
1N5947B
Nominal
Zener Voltage
VZ @ IZT
Volts
(Note 2 and 3)
3.3
3.6
3.9
4.3
4.7
5.1
5.6
6.2
6.8
7.5
8.2
9.1
10
11
12
13
15
16
18
20
22
24
27
30
33
36
39
43
47
51
56
62
68
75
82
Test
Current
IZT
mA
113.6
104.2
96.1
87.2
79.8
73.5
66.9
60.5
55.1
50
45.7
41.2
37.5
34.1
31.2
28.8
25
23.4
20.8
18.7
17
15.6
13.9
12.5
11.4
10.4
9.6
8.7
8
7.3
6.7
6
5.5
5
4.6
*Indicates JEDEC Registered Data.
Max. Zener Impedance (Note 4)
ZZT @ IZT
Ohms
ZZK @ IZK
Ohms
mA
10 500 1
9 500 1
7.5 500 1
6 500 1
5 500 1
4 350 1
2 250 1
2 200 1
2.5 200 1
3 400 0.5
3.5 400 0.5
4 500 0.5
4.5 500 0.25
5.5 550 0.25
6.5 550 0.25
7 550 0.25
9 600 0.25
10 600 0.25
12 650 0.25
14 650 0.25
17.5 650 0.25
19 700 0.25
23 700 0.25
26 750 0.25
33 800 0.25
38 850 0.25
45 900 0.25
53 950 0.25
67
1000
0.25
70
1100
0.25
86
1300
0.25
100
1500
0.25
120
1700
0.25
140
2000
0.25
160
2500
0.25
Max. Reverse
Leakage Current
IR @ VR
µA Volts
100 1
75 1
25 1
51
5 1.5
52
53
54
5 5.2
56
5 6.5
57
58
1 8.4
1 9.1
1 9.9
1 11.4
1 12.2
1 13.7
1 15.2
1 16.7
1 18.2
1 20.6
1 22.8
1 25.1
1 27.4
1 29.7
1 32.7
1 35.8
1 38.8
1 42.6
1 47.1
1 51.7
1 56
1 62.2
Maximum DC
Zener
Current
IZM
mAdc
454
416
384
348
319
294
267
241
220
200
182
164
150
136
125
115
100
93
83
75
68
62
55
50
45
41
38
34
31
29
26
24
22
20
18
(continued)
1–3 Watt DO-41 Surmetic 30 Data Sheet
6-46
Motorola TVS/Zener Device Data

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GENERAL DATA — 1-3 WATT DO-41 SURMETIC 30
*ELECTRICAL CHARACTERISTICS — continued (TL = 30°C unless otherwise noted. VF = 1.5 Volts Max @ lF = 200 mAdc for all
types.)
Motorola
Type
Number
(Note 1)
Nominal
Zener Voltage
VZ @ IZT
Volts
(Note 2 and 3)
Test
Current
IZT
mA
Max. Zener Impedance (Note 4)
ZZT @ IZT
Ohms
ZZK @ IZK
Ohms
mA
Max. Reverse
Leakage Current
IR @ VR
µA Volts
Maximum DC
Zener
Current
IZM
mAdc
1N5948B
91
4.1 200 3000 0.25 1 69.2
1N5949B
100
3.7
250 3100 0.25 1 76
1N5950B
110
3.4 300 4000 0.25 1 83.6
1N5951B
120
3.1
380 4500 0.25 1 91.2
1N5952B
130
2.9
450 5000 0.25 1 98.8
16
15
13
12
11
1N5953B
1N5954B
1N5955B
1N5956B
150
160
180
200
2.5 600
2.3 700
2.1 900
1.9 1200
*Indicates JEDEC Registered Data.
NOTE 1. TOLERANCE AND VOLTAGE DESIGNATION
Tolerance designation — Device tolerances of ±5% are indicated by a “B” suffix.
NOTE 2. SPECIAL SELECTIONS AVAILABLE INCLUDE:
6000 0.25 1 114
6500 0.25 1 121.6
7000 0.25 1 136.8
8000 0.25 1 152
10
9
8
7
Nominal zener voltages between those shown and ±1% and ±2% tight voltage tolerances.
Consult factory.
Motorola TVS/Zener Device Data
1–3 Watt DO-41 Surmetic 30 Data Sheet
6-47