nte4978 NTE Electronics, Inc., nte4978 Datasheet - Page 2
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nte4978
Manufacturer Part Number
nte4978
Description
Surge Clamping, Transient Overvoltage Suppressor Unidirectional
Manufacturer
NTE Electronics, Inc.
Datasheet
1.NTE4978.pdf
(2 pages)
Electrical Characteristics (Cont’d):
Clamping Factor: 1.33 @ full rated power
The clamping factor is defined as: The ratio of the actual V
(Breakdown Voltage) as measured on a specific device.
Note 1. Normal selection of a zener transient over voltage suppressor is by rated stand–off voltage
NTE Type
Number
4920
4922
4926
4928
4932
4934
4936
4938
4940
4942
4944
4946
4950
4952
4954
4958
4960
4962
4964
4966
4968
4970
4972
4974
4976
4978
4980
4982
4984
4988
4990
4992
4994
4996
4998
Diagram
Number
(V
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
WM
.042 (1.07) Dia Max
) and should be equal or greater than DC or continuous peak operating voltage.
Maximum Reverse
Stand Off Voltage
102.00
121.00
136.00
145.00
154.00
185.00
214.00
171.00
256.00
273.00
300.00
342.00
376.00
111.00
(Volts)
12.80
13.60
15.30
17.10
20.50
23.10
25.60
28.20
30.80
33.30
36.80
40.20
43.60
47.80
53.00
58.10
64.10
70.10
77.80
85.50
94.00
1.20 @ 50% rated power
V
R
(27.94)
105.00
124.00
135.00
152.00
162.00
171.00
209.00
237.00
190.00
285.00
304.00
333.00
380.00
418.00
114.00
1.100
14.30
15.20
17.10
19.00
22.80
25.70
28.50
31.40
34.20
37.10
40.90
44.70
48.50
53.20
58.90
64.60
71.30
77.90
86.50
95.00
Min
Min
Breakdown Voltage @ I
100.00
120.00
130.00
150.00
160.00
170.00
180.00
220.00
250.00
200.00
300.00
320.00
350.00
400.00
440.00
110.00
15.00
16.00
18.00
20.00
24.00
27.05
30.00
33.00
36.00
39.00
43.00
47.00
51.05
56.00
62.00
68.00
75.00
82.00
91.00
Typ
(Volts)
V
Color Band Denotes Cathode
BR
105.00
126.00
137.00
165.00
168.00
179.00
189.00
231.00
263.00
210.00
315.00
336.00
368.00
420.00
462.00
116.00
15.80
16.80
18.90
21.00
25.20
28.40
31.50
34.70
37.80
41.00
45.20
49.40
53.60
58.80
65.10
71.40
78.80
86.10
95.50
Max
T
I
T
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
mA
(9.52)
.375
Max
Clamping Voltage
@ I
103.0
125.0
137.0
152.0
165.0
179.0
215.0
219.0
234.0
246.0
328.0
344.0
274.0
414.0
438.0
482.0
548.0
603.0
113.0
pp
(Volts)
21.2
22.5
25.2
27.7
33.2
37.5
41.4
45.7
49.9
53.9
59.3
64.8
70.1
77.0
85.0
92.0
V
(1msec)
C
C
(Clamping voltage) to the actual BV
Maximum Ratings
Reverse Leakage
Current @ V
( A)
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
I
R
R
.205 (5.21)
Dia Max
Peak Pulse
Current
(Amps)
71.00
67.00
59.50
54.00
45.00
40.00
36.00
33.00
30.00
28.00
25.30
23.20
21.40
19.50
17.70
16.30
14.60
13.30
12.00
11.00
I
9.90
9.10
8.40
7.00
6.80
6.40
6.10
4.60
5.00
5.50
3.58
4.50
3.08
2.78
3.50
pp
Temperature
Coefficient
of BV%/ C
0.084
0.086
0.088
0.090
0.094
0.096
0.097
0.098
0.099
0.100
0.101
0.101
0.102
0.103
0.104
0.104
0.105
0.105
0.106
0.106
0.107
0.107
0.107
0.108
0.108
0.108
0.108
0.109
0.109
0.108
0.110
0.110
0.110
0.110
0.110