RC1313EFR-N-1.0-2-5/5470 datasheet, PDF

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RC1313EFR-N-1.0-2-5/5470: DescriptionRC Network, Isolated, 0.5W, 47ohm, 200V, 1uF, Through Hole Mount, 2 Pins, RADIAL LEADED; CategoryPassive components RC network; File Size20KB，2 Pages; ManufacturerEFC [Electronic Film Capacitors, Inc.]; Environmental Compliance

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RC1313EFR-N-1.0-2-5/5470 Overview

RC Network, Isolated, 0.5W, 47ohm, 200V, 1uF, Through Hole Mount, 2 Pins, RADIAL LEADED

RC1313EFR-N-1.0-2-5/5470 Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Maker	EFC [Electronic Film Capacitors, Inc.]
package instruction	RADIAL LEADED
Reach Compliance Code	compliant
capacitance	1 µF
Capacitor Negative Tolerance	5%
Capacitor positive tolerance	5%
The first element resistor	47 Ω
length	32 mm
Manufacturer's serial number	RC1313
Installation features	THROUGH HOLE MOUNT
Network Type	ISOLATED
Number of capacitor elements	1
Number of functions	1
Number of RC components	1
Number of resistor elements	1
Number of terminals	2
Package shape	RECTANGULAR PACKAGE
Rated (DC) voltage (URdc)	200 V
Rated power dissipation(P)	0.5 W
Resistor tolerance	10%
Resistor/Capacitor Network Type	RC NETWORK
Maximum seat height	17 mm
surface mount	NO
Terminal pitch	28.7 mm
Terminal shape	WIRE
width	8.5 mm

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ELECTRONIC FILM CAPACITORS, INC.

Reidville Industrial Park * 41 Interstate Lane

WATERBURY, CONNECTICUT 06705

PHONE (203) 755-5629

FAX (203) 755-0659

RESISTOR-CAPACITOR NETWORKS

APPLICATIONS

Noise suppression and contact protection

SERIES RC1313

source

Fig. 1 (across the load)

Fig. 2 (across the contacts)

The circuit to be used is dependent upon particular situations. Either circuit may be enough protection for

your needs. For extreme situations, both "Load" and "Contact" protection may be required.

Recommendations

There are two types of discharges that can damage switching contacts and generate noise:

(1) "Glow Discharges" caused by the ignition of gases between contacts. These develop at about 320 volts at

about a 0.0003 inch gap range and can be sustained at a much wider gap range.

(2) "Arc Discharges" occur at much lower voltages, about 0.5 MV/cm. Minimum voltages and currents are

necessary for "Arc Discharges" to be sustained. Contact material also plays a role in sustained "Arc Discharges".

(see Table 1)

MATERIAL

Silver

Gold

Gold Alloy

Palladium

Platinum

MIN. (VA)

Arcing Voltage

MIN. (IA)

Arcing Current mA

17.5

400

800

700

The function of the RC network is to:

(1) Keep the voltage across the contacts below 300 volts. C> (I

/300)

(2) Keep the rate of voltage change below 1V/µs. C> I

x 10

-6

(3) Keep the current below that described in Table

TABLE 1

Inductors do not instantly "let go" of a current. At the instant a contact opens, the current through the contact

does not want to change. Using Ohms Law (E = IR), we can see that when the contact is closed, the resistance

is essentially zero, making the voltage zero, as well. As the contact opens the resistance begins to increase.

This leads to the generation of a high voltage which is generally destructive to contact life.

Capacitors will restrict an instantaneous change in voltage. A capacitor, therefore is useful to counter the

destructive voltages generated at the switch contacts. When the contacts are closed, the capacitor is out of the

circuit. As the contacts are opened any change in voltage is restricted by the capacitor if its value is large enough

to restrict the voltage change to less than 1 V/µs.

A capacitor alone is not an ideal solution. When the contacts are open, the capacitor charges up to the supply

voltage. As the contact is "made", an inrush of current results limited only by a residual resistance and damage

may still result. For this reason, a resistor is configured in series with the capacitor. The higher the resistance

value the smaller the inrush current and the less effective is the capacitor. The voltage across the contacts when

opened is equal to the load current x resistance. (V = IR) It is recommended to keep V =< supply voltage.

In this case, the maximum resistance of the network (R

) will be equal to the load resistance (R

The above formulas are recommended for determining the RC network parameters. They do not identify all

of the subtleties but should serve as a guideline for effective results.

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