VISHAY
ZM4728 to ZM4764A
Vishay Semiconductors
Zener Diodes
Features
• Silicon Planar Power Zener Diodes.
• For use in stablilizing and clipping circuits with
high power rating.
• Standard Zener voltage tolerance is ± 5 %.
• These diodes are also available in the DO-41 case
with type designation 1N4728 A... 1N4764A
Mechanical Data
Case:
MELF Glass Case
Weight:
approx. 250 mg
Packaging Codes/Options:
E4 / 5k per 13 " reel (12 mm tape), 10k/box
25 / 1.5 K per 7 " reel (12 mm tape), 12k/box
18315
Absolute Maximum Ratings
T
amb
= 25 °C, unless otherwise specified
Parameter
Zener current (see Table
"Characteristics")
Power dissipation
1)
Test condition
Symbol
Value
Unit
P
tot
1.0
1)
W
Valid provided that electrodes are kept at ambient temperature.
Thermal Characteristics
T
amb
= 25 °C, unless otherwise specified
Parameter
Thermal resistance junction to
ambient air
Junction temperature
Storage temperature
1)
Test condition
Symbol
R
θJA
T
j
T
S
Value
170
1)
150
- 65 to + 150
Unit
°C/W
°C
°C
Valid provided that electrodes are kept at ambient temperature.
Document Number 85786
Rev. 2, 10-Sep-03
www.vishay.com
1
ZM4728 to ZM4764A
Vishay Semiconductors
Electrical Characteristics
Partnumber
Nominal
Zener
Voltage
3)
V
Z
@ I
ZT
V
ZM4728
ZM4729
ZM4730
ZM4731
ZM4732
ZM4733
ZM4734
ZM4735
ZM4736
ZM4737
ZM4738
ZM4739
ZM4740
ZM4741
ZM4742
ZM4743
ZM4744
ZM4745
ZM4746
ZM4747
ZM4748
ZM4749
ZM4750
ZM4751
ZM4752
ZM4753
ZM4754
ZM4755
ZM4756
ZM4757
ZM4758
ZM4759
ZM4760
ZM4761
ZM4762
ZM4763
ZM4764
1)
VISHAY
Test
Current
Maximum Zener Impedance
1)
Maximum Reverse
Leakage Current
Surge
current
Maximum
Reverse
Leakage
Current
2)
I
ZM
µA
276
252
234
217
193
178
162
146
133
121
110
100
91
83
76
69
61
57
50
45
41
38
34
30
27
25
23
22
19
18
16
14
13
12
11
10
9
I
ZT
mA
76
69
64
58
53
49
45
41
37
34
31
28
25
23
21
19
17
15.5
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
Z
ZT
@ I
ZT
Ω
10
10
9
9
8
7
5
2
3.5
4
4.5
5
7
8
9
10
14
16
20
22
23
25
35
40
45
50
60
70
80
95
110
125
150
175
200
250
350
Z
ZK
@ I
ZK
I
ZK
mA
I
R
µA
100
100
50
10
10
10
10
10
10
10
10
10
10
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
V
R
V
1
1
1
1
1
1
2
3
4
5
6
7
7.6
8.4
9.1
9.9
11.4
12.2
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
I
R
@ T
amb
=
25 °C
mA
1380
1260
1190
1070
970
890
810
730
660
605
550
500
454
414
380
344
304
285
250
225
205
190
170
150
135
125
115
110
95
90
80
70
65
60
55
50
45
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
91
100
400
400
400
400
500
550
600
700
700
700
700
700
700
700
700
700
700
700
750
750
750
750
750
1000
1000
1000
1000
1500
1500
1500
2000
2000
2000
2000
3000
3000
3000
1
1
1
1
1
1
1
1
1
0.5
0.5
0.5
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
0.25
0.25
0.25
0.25
0.25
0.25
The Zener impedance is derived from the 1KH
Z
AC voltage which results when an AC current having an RMS value equal to 10 % of
the Zener current (I
ZT
or I
ZK
) is superimposed on I
ZT
or I
ZK
. Zener impedance is measured at two points to insure a sharp knee on the
breakdown curve and to eliminate unstable units
2)
3)
Valid provided that electrodes at a distance of 10 mm from case are kept at ambient temperature
Measured under thermal equilibrium and DC test conditions.
www.vishay.com
2
Document Number 85786
Rev. 2, 10-Sep-03
VISHAY
ZM4728 to ZM4764A
Vishay Semiconductors
Typical Characteristics
(T
amb
= 25
°C
unless otherwise specified)
18289
Figure 1. Admissible Power Dissipation vs. Ambient Temperature
Package Dimensions in Inches (mm)
Cathode Mark
0.102 (2.6)
0.094 (2.4)
0.022 (0.55)
18317
0.205 (5.2)
0.189 (4.8)
Document Number 85786
Rev. 2, 10-Sep-03
www.vishay.com
3
ZM4728 to ZM4764A
Vishay Semiconductors
Mounting Pad Layout
VISHAY
0.049 (1.25)
MIN
0.157 (4.00)
MAX
0.118 (3.00)
MIN
18316
0.256 (6.50)
REF
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4
Document Number 85786
Rev. 2, 10-Sep-03
VISHAY
Ozone Depleting Substances Policy Statement
It is the policy of
Vishay Semiconductor GmbH
to
ZM4728 to ZM4764A
Vishay Semiconductors
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and
operatingsystems with respect to their impact on the health and safety of our employees and the public, as
well as their impact on the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are
known as ozone depleting substances (ODSs).
The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs
and forbid their use within the next ten years. Various national and international initiatives are pressing for an
earlier ban on these substances.
Vishay Semiconductor GmbH
has been able to use its policy of continuous improvements to eliminate the
use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments
respectively
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.
Vishay Semiconductor GmbH
can certify that our semiconductors are not manufactured with ozone depleting
substances and do not contain such substances.
We reserve the right to make changes to improve technical design
and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each
customer application by the customer. Should the buyer use Vishay Semiconductors products for any
unintended or unauthorized application, the buyer shall indemnify Vishay Semiconductors against all
claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal
damage, injury or death associated with such unintended or unauthorized use.
Vishay Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423
Document Number 85786
Rev. 2, 10-Sep-03
www.vishay.com
5
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