V661NA34 [LITTELFUSE]
Varistor Products - High Energy Industrial Square Disc; 压敏电阻产品 - 高能工业坊光盘
| 型号： | V661NA34 |
| 厂家： | 
LITTELFUSE |
| 描述： | Varistor Products - High Energy Industrial Square Disc |
| 文件： | 总5页 (文件大小：90K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Varistor Products
High Energy Industrial Square Disc
NA Varistor Series
The NA Series of transient surge suppressors are varistors (MOVs) in
square disc form, intended for special industrial high-energy applications
requiring unique electrical contact or packaging methods provided by the
customer. The electrode finish of these devices is solderable and can
also be used with pressure contacts. Discs may also be stacked.
The NA Series varistor is a square 34mm device, with thicknesses
ranging from 1.7mm minimum for the 250V device to 7.5mm maximum
for the 750V device. For information on mounting considerations refer to
Application Note AN8820.
This disc is also available with encapsulation and PCB leads. See
Littelfuse HB34 Sales.
Features
• Provided in Disc Form for Unique Packaging by Customer
• Solderable Electrode Finish.
• Pressure Contacts and/or Disc Stacking may be Utilized
• Wide Operating Voltage Range
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .250V to 750V
M(AC)RMS
• Peak Pulse Current Capability (I ). . . . . . . . . . . . . . . . . . . .40,000A
TM
• High Energy Capability (W ). . . . . . . . . . . . . . . . . . . .370J to 1050J
TM
• No Derating Up to 8oC Ambient
ALSO SEE HB34 SERIES
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Varistor Products
High Energy Industrial Square Disc
NA Varistor Series
Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart
NA SERIES
UNITS
Continuous:
Steady State Applied Voltage:
AC Voltage Range (V
DC Voltage Range (V
Transient:
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 to 750
). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330 to 970
V
V
M(AC)RMS
M(DC)
2
Peak Pulse Current (I
)
TM
For 8/20µs Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40,000
Single Pulse Energy Range
A
For 2ms Current Square Wave (W ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370 to1050
J
OC
TM
Operating Ambient Temperature Range (T ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 85
A
Storage Temperature Range (T
STG
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125
OC
Temperature Coefficient (αV) of Clamping Voltage (V ) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01
%/OC
C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Device Ratings and Specifications
o
o
MAXIMUM RATINGS (85 C)
CONTINUOUS TRANSIENT
SPECIFICATIONS (25 C)
MAXIMUM
CLAMPING
PEAK
CURRENT
(8/20µs)
VARISTOR VOLTAGE
AT 1mA DC TEST
CURRENT
VOLTAGE
TYPICAL
CAPACI-
TANCE
ENERGY
(2ms)
(V ) AT 200A
C
V
V
(8/20µs)
RMS
DC
SIZE
(mm)
34
V
V
W
I
MIN
(V)
V
MAX
(V)
V
C
f = 1MHz
(pF)
M(AC)
(V)
M(DC)
(V)
TM
TM
N(DC)
(V)
MODEL
NUMBER
(J)
(A)
(V)
V131NA34
130
140
150
250
275
320
420
480
510
575
660
750
175
270
40,0001
184
200
228
345
10,000
V141NA34
V151NA34
V251NA34
V271NA34
V321NA34
V421NA34
V481NA34
V511NA34
V571NA34
V661NA34
V751NA34
188
200
330
369
420
560
640
675
730
850
970
40,0003
40,0002
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
198
212
354
389
462
610
670
735
805
940
1080
220
240
390
430
510
680
750
820
910
9,000
8,000
5,000
4,500
3,800
3,000
2,700
2,500
2,200
2,000
1,800
34
34
34
34
34
34
34
34
34
34
34
291
300
370
400
460
600
650
700
770
900
1050
248
268
375
405
429
650
473
730
561
830
748
1,130
1,240
1,350
1,480
1,720
2,000
825
910
1000
1160
1320
1050
1200
NOTE: Average power dissipation of transients not to exceed 2.0W.
1. Peak current applies to applications rated up to 115VRMS. Peak current is 30kA for applications greater than 115VRMS
2. Peak current applies to applications rated up to 132VRMS. Peak current is 30kA for applications greater than 132VRMS
3. Peak current applies to applications rated up to 123VRMS. Peak current is 30kA for applications greater than 123VRMS
.
.
.
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Varistor Products
High Energy Industrial Square Disc
NA Varistor Series
Power Dissipation Ratings
100
90
80
70
60
50
40
30
20
10
0
Should transients occur in rapid succession, the average power
dissipation required is simply the energy (watt-seconds) per pulse times
the number of pulses per second. The power so developed must be
within the specifications shown on the Device Ratings and Specifications
table for the specific device. The operating values must be derated as
shown in Figure 1.
-55
50 60
70
80
90 100 110 120 130 140 150
o
AMBIENT TEMPERATURE ( C)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
O
= Virtual Origin of Wave
1
90
T = Time From 10% to 90% of Peak
T
T
= Virtual Front time = 1.25 • t
= Virtual Time to Half Value (Impulse Duration)
1
2
50
Example: For an 8/20µs Current Waveform:
8µs = T = Virtual Front Time
1
20µs = T = Virtual Time to Half Value
2
10
O
T
TIME
1
T
1
T
2
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Transient V-I Characteristics Curves
10000
MAXIMUM CLAMPING VOLTAGE
VARISTOR SIZE 34mm
o
o
T
= -55 C TO 85 C
A
130 TO 750 V
M(AC)
RATING
V751NA34
V661NA34
V511NA34
V481NA34
V571NA34
V421NA34
1000
V321NA34
V271NA34
V251NA34
V131NA34
V151NA34
100
-5
-4
1E-3
0.01
0.1
1
10
100
1,000
10,000
100,000
CURRENT (A)
FIGURE 3. CLAMPING VOLTAGE FOR V131NA34 - V751NA34
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Varistor Products
High Energy Industrial Square Disc
NA Varistor Series
Pulse Rating Curves
50,000
1
DISC SIZE 34mm
V131NA34 -V751NA34
2
20,000
10
10,000
2
5,000
2
5
10
10
6
10
2,000
1,000
3
10
10
4
500
200
100
50
INDEFINITE
20
20
10
100
1,000
IMPULSE DURATION (µs)
10,000
FIGURE 4. SURGE CURRENT RATING CURVES FOR
V131NA34 - V751NA34
NOTE:If pulse ratings are exceeded, a shift of V
N(DC)
(at specified current) of more than ±10% could result. This type of shift, which normally results in a decrease of V
N(DC),
may result in the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide ample protection.
NA SERIES
VARISTOR THICKNESS
Mechanical Dimensions
MILLIMETERS
INCHES
MIN
MODEL
NUMBER
(MILLIMETERS)
MIN
1.40
1.45
1.50
1.70
1.80
2.10
3.00
3.20
3.60
4.00
4.50
5.20
MAX
2.30
2.55
2.80
2.30
2.70
3.00
4.00
4.40
4.90
5.60
6.80
7.50
MAX
0.090
0.100
0.011
0.090
0.106
0.118
0.157
0.173
0.192
0.220
0.267
0.294
V131NA34
V141NA34
V151NA34
V251NA34
V271NA34
V321NA34
V421NA34
V481NA34
V511NA34
V571NA34
V661NA34
V751NA34
0.055
0.057
0.059
0.066
0.070
0.082
0.118
0.125
0.141
0.118
0.176
0.204
NOTE: Parts available encapsulated with soldered
tabs, to standard design or customer specific
requirements. Also see HB34 Series.
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Varistor Products
High Energy Industrial Square Disc
NA Varistor Series
Passivation Layer
The standard NA Series is supplied with passivation layer around the
outside perimeter of the disc forming an electrical insulator as detailed in
the dimensional drawing.
250
200
150
100
50
Encapsulated Recommendations
After lead attachment, the disc/lead assembly may be coated or
encapsulated in a package to provide electrical insulation and isolation
from environmental contamination as required by the application.
Coating/Filler materials for containers may include silicones,
polyurethanes, and some epoxy resins. Two examples of acceptable
polyurethanes are Dexter Hysol (US7013, parts A and B) and Rhenatech
(resin 4714, hardener 4900), or their equivalents. Materials containing
halogens, sulfides, or alkalines are not recommended.
0
0
100 200
300
400
500
600
700
800 900
TIME (SEC)
Electrode Metallization
The NA Series is supplied with a sintered silver metallization for the
electrode finish. The silver metallization is typically used for solder reflow
lead attach operations (I-R, Vapour-Phase).
FIGURE 6. TYPICAL BELT OVEN TEMPERATURE PROFILE
Stacking and Contact Pressure
Recommendations
When applications require the stacking of Littelfuse NA discs or when
electrical connection is made by pressure contacts, the minimum pres-
sure applied to the disc electrode surface should be 2.2kGs (5 pounds).
The maximum recommended pressure applied to the disc electrode is
16N/CM2 (23LBs/IN2).
The recommended temperature profile of a belt-fed convection oven is
shown in Figure 6.
Packaging and Shipping
The NA Series is supplied in bulk for shipment. Discs are packaged in
compartmentalized cartons to protect from scratching or edge-chipping
during shipment.
Ordering Information
V 25 1 NA 34
VARISTOR DESIGNATOR
DISC SIZE (mm)
MAX AC
WORKING VOLTAGE
SERIES DESIGNATOR
RMS
(FIRST SIGNIFICANT DIGITS) V
M(AC)
V
VOLTAGE DECADE MULTIPLIER
M(AC)
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