1N4728A Series
1 Watt DO-41 Hermetically
Sealed Glass Zener Voltage
Regulator Diodes
This is a complete series of 1 Watt Zener diode with limits and
excellent operating characteristics that reflect the superior capabilities
of silicon–oxide passivated junctions. All this in an axial–lead
hermetically sealed glass package that offers protection in all common
environmental conditions.
Specification Features:
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•
•
•
•
•
•
Zener Voltage Range – 3.3 V to 91 V
ESD Rating of Class 3 (>16 KV) per Human Body Model
DO–41 (DO–204AL) Package
Double Slug Type Construction
Metallurgical Bonded Construction
Oxide Passivated Die
AXIAL LEAD
CASE 59–10
GLASS
Mechanical Characteristics:
CASE:
Double slug type, hermetically sealed glass
FINISH:
All external surfaces are corrosion resistant and leads are
L
1N
47
xxA
YWW
readily solderable
MAXIMUM LEAD TEMPERATURE FOR SOLDERING PURPOSES:
230°C, 1/16″ from the case for 10 seconds
POLARITY:
Cathode indicated by polarity band
MOUNTING POSITION:
Any
MAXIMUM RATINGS
Rating
Max. Steady State Power Dissipation
@ T
L
≤
50°C, Lead Length = 3/8″
Derated above 50°C
Operating and Storage
Temperature Range
Symbol
P
D
Value
1.0
6.67
T
J
, T
stg
– 65 to
+200
Unit
Watt
mW/°C
°C
L
= Assembly Location
1N47xxA = Device Code
Y
= Year
WW
= Work Week
Cathode
Anode
ORDERING INFORMATION
(Note 1.)
Device
1N47xxA
1N47xxARL
1N47xxARL2
1N47xxATA
1N47xxATA2
Package
Axial Lead
Axial Lead
Axial Lead
Axial Lead
Axial Lead
Shipping
2000 Units/Box
6000/Tape & Reel
6000/Tape & Reel
4000/Ammo Pack
4000/Ammo Pack
1. The “2” suffix refers to 26 mm tape spacing.
Devices listed in
bold, italic
are ON Semiconductor
Preferred
devices.
Preferred
devices are recommended
choices for future use and best overall value.
©
Semiconductor Components Industries, LLC, 2002
1
January, 2002 – Rev. 2
Publication Order Number:
1N4728A/D
1N4728A Series
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless
otherwise noted, V
F
= 1.2 V Max., I
F
= 200 mA for all types)
Symbol
V
Z
I
ZT
Z
ZT
I
ZK
Z
ZK
I
R
V
R
I
F
V
F
I
r
Parameter
Reverse Zener Voltage @ I
ZT
Reverse Current
Maximum Zener Impedance @ I
ZT
Reverse Current
Maximum Zener Impedance @ I
ZK
Reverse Leakage Current @ V
R
Breakdown Voltage
Forward Current
Forward Voltage @ I
F
Surge Current @ T
A
= 25°C
V
Z
V
R
I
R
V
F
I
ZT
V
I
F
I
Zener Voltage Regulator
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted, V
F
= 1.2 V Max, I
F
= 200 mA for all types)
Zener Voltage
(3.)(4.)
JEDEC
Device
(2.)
1N4728A
1N4729A
1N4730A
1N4731A
1N4732A
V
Z
(Volts)
Min
3.14
3.42
3.71
4.09
4.47
Nom
3.3
3.6
3.9
4.3
4.7
Max
3.47
3.78
4.10
4.52
4.94
@ I
ZT
(mA)
76
69
64
58
53
Zener Impedance
(5.)
Z
ZT
@ I
ZT
(W)
10
10
9
9
8
Z
ZK
@ I
ZK
(W)
400
400
400
400
500
(mA)
1
1
1
1
1
Leakage Current
I
R
@ V
R
(µA Max)
100
100
50
10
10
(Volts)
1
1
1
1
1
I
r (6.)
(mA)
1380
1260
1190
1070
970
1N4733A
1N4734A
1N4735A
1N4736A
1N4737A
1N4738A
1N4739A
1N4740A
1N4741A
1N4742A
1N4743A
1N4744A
1N4745A
4.85
5.32
5.89
6.46
7.13
7.79
8.65
9.50
10.45
11.40
12.4
14.3
15.2
5.1
5.6
6.2
6.8
7.5
8.2
9.1
10
11
12
13
15
16
5.36
5.88
6.51
7.14
7.88
8.61
9.56
10.50
11.55
12.60
13.7
15.8
16.8
49
45
41
37
34
31
28
25
23
21
19
17
15.5
7
5
2
3.5
4
4.5
5
7
8
9
10
14
16
550
600
700
700
700
700
700
700
700
700
700
700
700
1
1
1
1
0.5
0.5
0.5
0.25
0.25
0.25
0.25
0.25
0.25
10
10
10
10
10
10
10
10
5
5
5
5
5
1
2
3
4
5
6
7
7.6
8.4
9.1
9.9
11.4
12.2
890
810
730
660
605
550
500
454
414
380
344
304
285
TOLERANCE AND TYPE NUMBER DESIGNATION
2. The JEDEC type numbers listed have a standard tolerance on the nominal zener voltage of
±5%.
SPECIALS AVAILABLE INCLUDE:
3. Nominal zener voltages between the voltages shown and tighter voltage tolerances. For detailed information on price, availability, and
delivery, contact your nearest ON Semiconductor representative.
ZENER VOLTAGE (V
Z
) MEASUREMENT
4. ON Semiconductor guarantees the zener voltage when measured at 90 seconds while maintaining the lead temperature (T
L
) at 30°C
±
1°C, 3/8″ from the diode body.
ZENER IMPEDANCE (Z
Z
) DERIVATION
5. The zener impedance is derived from the 60 cycle ac voltage, which results when an ac current having an rms value equal to 10% of the
dc zener current (I
ZT
or I
ZK
) is superimposed on I
ZT
or I
ZK
.
SURGE CURRENT (I
R
) NON-REPETITIVE
6. The rating listed in the electrical characteristics table is maximum peak, non-repetitive, reverse surge current of 1/2 square wave or equiv-
alent sine wave pulse of 1/120 second duration superimposed on the test current, I
ZT
, per JEDEC registration; however, actual device
capability is as described in Figure 5 of the General Data – DO-41 Glass.
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2
1N4728A Series
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted, V
F
= 1.2 V Max, I
F
= 200 mA for all types) (continued)
Zener Voltage
(8.)(9.)
JEDEC
Device
(7.)
V
Z
(Volts)
Min
Nom
Max
@ I
ZT
(mA)
Zener Impedance
(10.)
Z
ZT
@ I
ZT
(W)
Z
ZK
@ I
ZK
(W)
(mA)
Leakage Current
I
R
@ V
R
(µA Max)
(Volts)
I
r (11.)
(mA)
1N4746A
1N4747A
1N4748A
1N4749A
1N4750A
1N4751A
1N4752A
1N4753A
1N4754A
1N4755A
1N4756A
1N4757A
1N4758A
1N4759A
1N4760A
1N4761A
1N4762A
1N4763A
1N4764A
17.1
19.0
20.9
22.8
25.7
28.5
31.4
34.2
37.1
40.9
44.7
48.5
53.2
58.9
64.6
71.3
77.9
86.5
95
18
20
22
24
27
30
33
36
39
43
47
51
56
62
68
75
82
91
100
18.9
21.0
23.1
25.2
28.4
31.5
34.7
37.8
41.0
45.2
49.4
53.6
58.8
65.1
71.4
78.8
86.1
95.6
105
14
12.5
11.5
10.5
9.5
8.5
7.5
7
6.5
6
5.5
5
4.5
4
3.7
3.3
3
2.8
2.5
20
22
23
25
35
40
45
50
60
70
80
95
110
125
150
175
200
250
350
750
750
750
750
750
1000
1000
1000
1000
1500
1500
1500
2000
2000
2000
2000
3000
3000
3000
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
13.7
15.2
16.7
18.2
20.6
22.8
25.1
27.4
29.7
32.7
35.8
38.8
42.6
47.1
51.7
56
62.2
69.2
76
250
225
205
190
170
150
135
125
115
110
95
90
80
70
65
60
55
50
45
TOLERANCE AND TYPE NUMBER DESIGNATION
7. The JEDEC type numbers listed have a standard tolerance on the nominal zener voltage of
±5%.
SPECIALS AVAILABLE INCLUDE:
8. Nominal zener voltages between the voltages shown and tighter voltage tolerances. For detailed information on price, availability, and
delivery, contact your nearest ON Semiconductor representative.
ZENER VOLTAGE (V
Z
) MEASUREMENT
9. ON Semiconductor guarantees the zener voltage when measured at 90 seconds while maintaining the lead temperature (T
L
) at 30°C
±
1°C,
3/8″ from the diode body.
ZENER IMPEDANCE (Z
Z
) DERIVATION
10. The zener impedance is derived from the 60 cycle ac voltage, which results when an ac current having an rms value equal to 10% of the
dc zener current (I
ZT
or I
ZK
) is superimposed on I
ZT
or I
ZK
.
SURGE CURRENT (I
R
) NON-REPETITIVE
11. The rating listed in the electrical characteristics table is maximum peak, non-repetitive, reverse surge current of 1/2 square wave or equivalent
sine wave pulse of 1/120 second duration superimposed on the test current, I
ZT
, per JEDEC registration; however, actual device capability
is as described in Figure 5 of the General Data – DO-41 Glass.
PD , MAXIMUM STEADY STATE POWER DISSIPATION (WATTS)
1.25
1
0.75
0.5
0.25
L = 1″
L = 1/8″
L = 3/8″
L = LEAD LENGTH
TO HEAT SINK
0
20
40
60
80 100 120 140
T
L
, LEAD TEMPERATURE (°C)
160
180
200
Figure 1. Power Temperature Derating Curve
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3
1N4728A Series
a. Range for Units to 12 Volts
θV
Z , TEMPERATURE COEFFICIENT (mV/°C)
θV
Z , TEMPERATURE COEFFICIENT (mV/°C)
+12
+10
+8
+6
+4
+2
0
-2
-4
2
3
4
5
6
7
8
9
V
Z
, ZENER VOLTAGE (VOLTS)
10
11
12
RANGE
V
Z
@ I
ZT
100
70
50
30
20
10
7
5
3
2
1
10
20
30
50
V
Z
, ZENER VOLTAGE (VOLTS)
70
100
RANGE
V
Z
@ I
ZT
b. Range for Units to 12 to 100 Volts
Figure 2. Temperature Coefficients
(–55°C to +150°C temperature range; 90% of the units are in the ranges indicated.)
θ
JL , JUNCTION TO LEAD THERMAL RESISTANCE (mV/°C/W)
150
125
100
75
50
25
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
θV
Z , TEMPERATURE COEFFICIENT (mV/°C)
175
+6
+4
+2
0
-2
-4
V
Z
@ I
Z
T
A
= 25°C
20 mA
0.01 mA
1 mA
NOTE: BELOW 3 VOLTS AND ABOVE 8 VOLTS
NOTE:
CHANGES IN ZENER CURRENT DO NOT
NOTE:
EFFECT TEMPERATURE COEFFICIENTS
3
4
5
6
7
8
V
Z
, ZENER VOLTAGE (VOLTS)
L, LEAD LENGTH TO HEAT SINK (INCHES)
Figure 3. Typical Thermal Resistance
versus Lead Length
100
70
50
30
20
10
7
5
3
2
1
0.01
10% DUTY CYCLE
20% DUTY CYCLE
5% DUTY CYCLE
Figure 4. Effect of Zener Current
Ppk , PEAK SURGE POWER (WATTS)
11 V-100 V NONREPETITIVE
3.3 V-10 V NONREPETITIVE
RECTANGULAR
WAVEFORM
T
J
= 25°C PRIOR TO
INITIAL PULSE
0.02
0.05
0.1
0.2
0.5
This graph represents 90 percentile data points.
For worst case design characteristics, multiply surge power by 2/3.
1
2
5
PW, PULSE WIDTH (ms)
10
20
50
100
200
500
1000
Figure 5. Maximum Surge Power
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4
1N4728A Series
1000
500
200
100
50
20
10
5
2
1
0.1
0.2
0.5
1
2
5
10
I
Z
, ZENER CURRENT (mA)
20
50
100
6.2 V
V
Z
= 2.7 V
47 V
27 V
T
J
= 25°C
i
Z
(rms) = 0.1 I
Z
(dc)
f = 60 Hz
1000
700
500
200
100
70
50
20
10
7
5
2
1
1
2
3
5
7 10
20 30
V
Z
, ZENER VOLTAGE (V)
50
70 100
T
J
= 25°C
i
Z
(rms) = 0.1 I
Z
(dc)
f = 60 Hz
Z Z , DYNAMIC IMPEDANCE (OHMS)
Z Z , DYNAMIC IMPEDANCE (OHMS)
I
Z
= 1 mA
5 mA
20 mA
Figure 6. Effect of Zener Current
on Zener Impedance
Figure 7. Effect of Zener Voltage
on Zener Impedance
10000
7000
5000
2000
1000
700
500
200
100
70
50
I R , LEAKAGE CURRENT (µ A)
20
10
7
5
2
1
0.7
0.5
0.2
0.1
0.07
0.05
0.02
0.01
0.007
0.005
0.002
0.001
3
4
5
6
7
8
400
300
TYPICAL LEAKAGE CURRENT
AT 80% OF NOMINAL
BREAKDOWN VOLTAGE
200
C, CAPACITANCE (pF)
100
50
20
10
8
4
1
2
0 V BIAS
1 V BIAS
50% OF BREAKDOWN BIAS
5
10
20
V
Z
, NOMINAL V
Z
(VOLTS)
50
100
Figure 9. Typical Capacitance versus V
Z
1000
500
I F , FORWARD CURRENT (mA)
200
100
50
20
10
5 150°C
2
9
10
11
12
13
14
15
1
0.4
0.5
0.6
0.7
0.8
75°C
25°C
0°C
0.9
1
1.1
+125°C
MINIMUM
MAXIMUM
+25°C
V
Z
, NOMINAL ZENER VOLTAGE (VOLTS)
V
F
, FORWARD VOLTAGE (VOLTS)
Figure 8. Typical Leakage Current
Figure 10. Typical Forward Characteristics
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5
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