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| 型號： | PWC2010-68RJI |
| 英文描述： | RESISTOR SMD 68R |
| 中文描述： | 電阻貼片68R |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 295K |
| 代理商： | PWC2010-68RJI |
Applications
Size
0805
1206
2010
2512
Power @70°C
0.125W
0.33W
0.75W
1.5W
Resistance range
1R0 to 10M
Tolerance
0.5, 1, 2, 5%
LEV
150V
200V
400V
500V
TCR
<10R:200ppm/°C
≥
10R:100ppm/°C
Operating temperature
-55 to +155°C
Values
E96 preferred other values to special order
Pulse capability
See following pages
Line
Welwyn
Resistor
Over
Voltage
Protection
Welwyn
Resistor
Input
Lightning Surge
Power
Supply
Circuit
Output
Applications vary from line protection for telecommunications
to surge withstanding resistors for use in circuit breakers.
Details of a typical telecomm and power supply application are
given below.
Telephone lines can be subjected to a large range of voltage
disturbances, many of which can damage switching equipment.
This has led to the need for circuit protection against both high
voltage transients, usually of short duration caused by lighting
strikes and overloads of longer duration, due to direct
connection to mains power lines.
These two faults are separated into primary and secondary
protection. Primary protection handles the high voltage
transients, and is usually located within the exchange.
Secondary protection is usually built into the equipment to be
protected, and deals with both current and voltage limiting.
Voltage limiting prevents damage to the equipment and shock
hazards, and current limiting prevents damage to wiring.
A typical application circuit is shown in fig 1 where the resistors
are designed for ring signal sending through a solid state relay.
The resistors are protected from lightning surge by Over-voltage
Protection in the system and the resistors are required to
withstand pulses of 15 Watts for 1 second and 75 Watts for
0.1 second, repeated 60 times. Test requirements for telecomms
applications are laid down by the International
Telecommunications Union (ITU) and Bell Communications
Research (Bellcore).
Fig 2 shows a typical power supply or battery charger circuit. In
this application the resistor is required to withstand a small
inrush surge, and also a lightning strike surge. The lightning
strike is usually simulated by applying either a 1.2/50μs or
10/700μs pulse shape, the number of pulses and pulse intervals
being specified by the customer or the relevant standard. Typical
standards to be met are Cenelec EN50082-1 and EN50082-2
which are part of the European EMC directives.
To determine the suitability of a PWC series chip resistors for
your application refer to the pulse withstanding data as given
below. Graphs have been produced to show the PWC
performance under single and continuous pulse, maximum
pulse voltage for single and continuous pulses and lighting
surge performance using both 1.2/50μs and 10/700μs pulse
shapes.
Fig 1
Fig 2
2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PWC2010-68RJI | 制造商:TT Electronics / Welwyn 功能描述:RESISTOR 2010 68R |
| PWC2010-68RJT1 | 制造商:Welwyn Components 功能描述:Bulk |
| PWC2010-6K8F | 制造商:TT Electronics / Welwyn 功能描述:RESISTOR 2010 1% 6K8 制造商:TT Electronics / Welwyn 功能描述:RESISTOR, 2010, 1%, 6K8 制造商:TT Electronics / Welwyn 功能描述:RESISTOR, 2010, 1%, 6K8; Product Range:WELWYN - PWC Series; Resistance:6.8kohm; Power Rating:750mW; Resistance Tolerance: 1%; Resistor Case Style:2010 [5025 Metric]; Resistor Element Material:Thick Film; Temperature Coefficient: ;RoHS Compliant: Yes |
| PWC2010-6K8JI | 功能描述:厚膜電阻器 - SMD 0.75watt 6.8K ohm 5% RoHS:否 制造商:Bourns 電阻:1.5 Ohms 容差:1 % 功率額定值:25 W 電壓額定值:250 V 外殼代碼 - in: 外殼代碼 - mm: 端接類型:SMD/SMT 溫度系數(shù):100 PPM / C 系列:PWR163 工作溫度范圍:- 55 C to + 155 C 封裝:Tube |
| PWC2010-6K8JI | 制造商:TT Electronics / Welwyn 功能描述:RESISTOR 2010 6K8 |
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