Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number.
Available as non-RoHS
(Sn/Pb plating), standard, and as RoHS by adding “-PBF” suffix.
MAXIMUM RATINGS
Characteristics
Power dissipation @ 25°C
Junction temperature
Operating and storage temperature range
Maximum thermal resistance, junction to lead
@ 3/8 inch lead length from body
Maximum thermal resistance, junction to ambient
when mounted on FR4 PC board with 4mm2 copper pads and track width 1mm, length 25mm
Steady state power
@ 3/8 inch lead length from body
when mounted on FR4 PC board with 4mm2 copper pads and track width 1mm, length 25mm
Forward voltage @ 200mA
Solder temperatures
Value
1W
175°C
-65 to +175°C
80°C/W
140°C/W
1.0W @ T
L
≤ 95°C
1.0W @ T
A
≤ 35°C
1.2 volts maximum
260°C for 10 s maximum
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise specified)
Type
Number
Zener
Voltage
(4)
(V
Z
)
VOLTS
1N4728
1N4729
1N4730
1N4731
1N4732
1N4733
1N4734
1N4735
1N4736
1N4737
1N4738
1N4739
1N4740
1N4741
1N4742
1N4743
1N4744
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
Test
Current
(l
ZT
)
mA
76
69
64
58
53
49
45
41
37
34
31
28
25
23
21
19
17
Maximum
Dynamic
Impedance
(2)
(Z
ZT
@ l
ZT
)
OHMS
10
10
9.0
9.0
8.0
7.0
5.0
2.0
3.5
4.0
4.5
5.0
7.0
8.0
9.0
10
14
Maximum
Reverse
Current
(l
R
@ V
R
)
μA
100
100
50
10
10
10
10
10
10
10
10
10
10
5
5
5
5
Test
Voltage
(V
R
)
VOLTS
1
1
1
1
1
1
2
3
4
5
6
7
7.6
8.4
9.1
9.9
11.4
Maximum
Regulator
Current (l
ZM
)
T
A
= 50°C
mA
276
252
234
217
193
178
162
146
133
121
110
100
91
83
76
69
61
Maximum
Knee
Impedance
(2)
(Z
ZK
@ l
ZK
)
OHMS
400
400
400
400
500
550
600
700
700
700
700
700
700
700
700
700
700
Test
Current
(l
ZK
)
mA
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.25
0.25
0.25
0.25
0.25
Maximum
(Surge)
Current
(3)
(l
S
)
mA
1380
1260
1190
1070
970
890
810
730
660
605
550
500
454
414
380
344
304
Rev. 20120912
1N4728(A)-1N4764(A)
1 WATT ZENER DIODES
High-reliability discrete products
and engineering services since 1977
ELECTRICAL CHARACTERISTICS (continued)
Type
Number
Zener
Voltage
(4)
(V
Z
)
VOLTS
1N4745
1N4746
1N4747
1N4748
1N4749
1N4750
1N4751
1N4752
1N4753
1N4754
1N4755
1N4756
1N4757
1N4758
1N4759
1N4760
1N4761
1N4762
1N4763
1N4764
16
18
20
22
24
27
30
33
36
39
43
47
51
56
62
68
75
82
91
100
Test
Current
(l
ZT
)
mA
15.5
14
12.5
11.5
10.5
9.5
8.5
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.7
3.3
3.0
2.8
2.5
Maximum
Dynamic
Impedance
(2)
(Z
ZT
@ l
ZT
)
OHMS
16
20
22
23
25
35
40
45
50
60
70
80
95
110
125
150
175
200
250
350
Maximum
Reverse
Current
(l
R
@ V
R
)
μA
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
Test
Voltage
(V
R
)
VOLTS
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
56.0
62.2
69.2
76.0
Maximum
Regulator
Current (l
ZM
)
T
A
= 50°C
mA
57
50
45
41
38
34
30
27
25
23
22
19
18
16
14
13
12
11
10
9
Maximum
Knee
Impedance
(2)
(Z
ZK
@ l
ZK
)
OHMS
700
750
750
750
750
750
1000
1000
1000
1000
1500
1500
1500
2000
2000
2000
2000
3000
3000
3000
Test
Current
(l
ZK
)
mA
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
Maximum
(Surge)
Current
(3)
(l
S
)
mA
285
250
225
205
190
170
150
135
125
115
110
95
90
80
70
65
60
55
50
45
Note 1:
Zener voltage tolerance on ‘’A’’ suffix is
+ 5%. No suffix denotes +10%
tolerance. ‘’C’’ suffix denotes
+
2% and ‘’D’’ suffix denotes
+ 1%.
Note 2: Zener impedance is derived from the 60Hz ac voltage that results when an ac current having an rms value equal to 10% of the dc Zener current is
superimposed on I
ZT
or I
ZK
. Zener impedance is measured at two points to ensure a sharp knee on the breakdown curve and eliminate unstable units.
Note 3: The reverse surge current is measured at 25°C ambient using a ½ square wave or equivalent sine wave pulse 1/120 second duration superimposed on I
ZT
.
Note 4: Zener voltage (V
Z
) is measured at T
L
= 25°C (+8, -2°C) and 90 seconds after application of dc current.
据外媒报道，萨里大学（University of Surrey）的研究人员开发出一种无需依赖GPS即可在人口密集的城市地区精确定位设备位置的人工智能系统。该系统可将定位误差从734米缩小到22米以内，这对于自动驾驶汽车和救援车辆等技术的发展意义重大。 图片来源： 萨里大学 在发表于《IEEE Robotics and Automation Letters》的论文中，研究人员介绍了PEn...[详细]
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