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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.
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
250
200
150
100
50
halogens, sulfides, or alkalines are not recommended.
0
0
100
200
300
400
500
600
700
800
900
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).
The recommended temperature profile of a belt-fed convection oven is
shown in Figure 6.
TIME (SEC)
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/CM 2 (23LBs/IN 2 ).
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
MAX AC RMS WORKING VOLTAGE
DISC SIZE (mm)
SERIES DESIGNATOR
(FIRST SIGNIFICANT DIGITS) V M(AC)
V M(AC) VOLTAGE DECADE MULTIPLIER
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相关代理商/技术参数
V751S001-199XX-1XX-XNG1
制造商:Carling Technologies 功能描述:V-SERIES ROCKER SWITCH - Bulk
V751S001-1ZZ00-000
制造商:Carling Technologies 功能描述:V-SERIES ROCKER SWITCH - Bulk 制造商:Carling Technologies 功能描述:SWITCH
V751S001-6ZZ00-000
制造商:Carling Technologies 功能描述:V-SERIES ROCKER SWITCH - Bulk
V751S001-6ZZXX-100-XBR1
功能描述:摇臂开关与扳钮开关 SPST ON-OFF-(ON)
RoHS:否 制造商:C&K Components 触点形式: 开关功能: 电流额定值:50 mA 电压额定值 AC: 电压额定值 DC:30 V 功率额定值: 端接类型: 执行器:Paddle 颜色: 安装风格:Panel 端子密封: 触点电镀: 照明:Not Illuminated 照明颜色:
V751S001-JZZ00-000
制造商:Carling Technologies 功能描述:V-SERIES ROCKER SWITCH - Bulk
V751S004-1ZZ00-000
制造商:Carling Technologies 功能描述:V-SERIES ROCKER SWITCH - Bulk
V751S00B-1ZZ00-000
制造商:Carling Technologies 功能描述:V-SERIES ROCKER SWITCH - Bulk
V751S00B-AZB00-000
制造商:Carling Technologies 功能描述:V-SERIES ROCKER SWITCH - Bulk