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Carbon Film Resistors (RD)
Fusible Film Resistors (RF)
Cement Resistors (RG)
Metal Glaze Resistors (RM)
Metal Film Resistors (RN)
Metal Oxide Resistors (RS)
Wire Wound Resistors (RW)
Insulated 0Ω Resistors (RZ)
Metal Plate Resistors (MPC)
Anti-burst Fusible Resistor
(RFB)


 

Insulated 0Ω Resistors (RZ)


1. Scope of the coverage:
 This specification is pertinent to the application of insulated 0Ω resistors (designated as RZ).
2 .Temperature range of the application:
 -55℃ ~ +155℃。
3. Type:
 The color of the coating resin for the 0Ω insulated resistors is gray.
4.Marking and illustration:
 Two types of designation methods are available for 0Ωinsulated resistors. One is black ink
 alphanumeric marking and the other one is color code marking. The criteria of using either one of
 the marking methods depend on the size of the resistors and customers request which is listed in
 the following:
 alphanumeric marking ---->1/2W (Fig.1)
 color code marking ------------>1/6W、1/4W (Fig.2)
 
 
5.Dimension, voltage, resistance range: listed in the following Table-1

Rated

power

(W)

Type

Resistance (Ω)

2
J ( ±5%)
L
ι
1/6
Normal
20mΩ以下
1.5A
1.8±0.3
28±2
0.45±0.05
1/4
Normal
20mΩ以下
2.5A
2.4±0.1
28±2
0.60±0.05
1/2
Normal
20mΩ以下
2.5A
3.0±0.5
30±3
0.60±0.05
 
6.Coating
 
 6.1 The body of the resistor is covered by nonflammable silicon resin.
 6.2 The maximum length of the lead wire covered by the resin is 2mm.
 6.3 The maximum area of the end cap which is not covered by the resin is half of the diameter of
 6.3 the cap.
 6.4 The status of coating condition described by 6.2 and 6.3 are acceptable.
 
7.Characteristics of electrical performance
 7.1 Rated power
 The rated power indicates the maximum power the resistor can endure continuously when the
 ambient temperature is equal to or lower than 70℃. When the ambient temperature is higher than
 70℃, the rated power of the resistor is determined by the derating curve described in the following
 figure.
 7.2 Dielectric strength (Ref. JIS C5202 5.7)
 Equipment: Dielectric strength tester
 The body of the resistor is wrapped around by the aluminum foil without extending beyond the
 resistor body. Clap one electrode on the aluminum foil and the other electrode on the lead wire.
 Apply following voltage from the tester to the resistor for 1 min.. No flash-over, burning or
 breakdown should be observed.
 
Wattage
1/6W
1/4W
1/2W
Voltage
300V
500V
500V
 
8.Environmental tests
 8.1 Load life test (Endurance with rated load) (Ref. JIS C5202 7.10)
 Equipment: High temperature chamber and DC power supply
 The resistors are put in a fixture where no interference will be allowed. Put the fixture in a 70±3℃
 chamber and apply rated current in table-1 with a cycle of 90 min. ON and 30 min. OFF for
 hours. After 240, 480, 720 and 1,000 hours, the resistors are taken out and stabilize at room
 temperature for 30 min. and then the resistance is measured. Upon each step of resistance
 measurement, the change of the resistance should be≦20mΩ and the appearance should show
 no remarkable abnormality and legibility of marking.
 
 8.2 Endurance under damp heat and load (Ref. JIS C5202 7.9)
 Equipment: Constant temperature and humidity chamber, DC power supply
 The resistors are put in a fixture where no interference will be allowed. Put the fixture in a 40±2℃
 chamber with RH=90~95% and apply rated current in table-1 with a cycle of 90 min. ON and 30
 min. OFF for hours. Water drops should avoid dripping on the resistors. After 240 and
 1,000 hours, the resistors are taken out and stabilize at room temperature for 1 hour and then the
 resistance is measured. Upon each step of measurement, the change of the resistance should be
 ≦20mΩ and the appearance should show no remarkable abnormality and legibility of marking.
 
 8.3 Temperature cycling (Ref. JIS C5202 7.4)
 Equipment: High temperature chamber, low temperature chamber
 Put the resistor to -55℃ chamber for 30 min. then take it out at room temperature for 2 to 3 min..
 Put the resistor to +85℃ chamber for 30 min. then take it out at room temperature for 2 to 3 min.
 This completes a cycle. Repeat the cycle 5 times. Put resistors at room temperature for 90 min.
 and then measure the resistance. Compare the resistance before and after test. The acceptable
 change of resistance is≦20mΩ. The appearance should show no remarkable abnormality and
 legibility of marking.
 
9.Mechanical performance
 9.1 Resistance to soldering heat (Ref. JIS C5202 6.4)
 Equipment: Solder bath
 Measure the resistance before the test. Immerse part of the lead wire which is 4±0.8mm away
 from the body to the flux for 5 - 10 sec. Take the resistor out and immerse resistors in the solder
 bath of 350±10℃ for 3.5±0.5 sec.. Stabilize at room temperature for 1 hour and then measure the
 resistance value. Compare the resistance values before and after the test, The acceptable change
 is ≦20mΩ.
 
 9.2 Solderability (Ref. JIS C5202 6.5)
 Equipment: Solder bath
 Immerse part of the lead wire which is 4±0.8mm away from the body to the flux for 5 - 10 sec. Take
 the resistor out and immerse resistors in the solder bath of 245±5℃ for 3.5±0.5 sec. Take the
 resistor out and inspect the lead wire visually. The acceptable level is the coverage of the new
 solder to be 95%. The composition of the solder bath is 99.7% tin and 0.3% Cu.
 
 9.3 Robustness of terminals (Ref. JIS C5202 6.1)
 9.3.1 Tensile strength of termination
 Equipment: Weight gauge
 Fixed the resistor and apply axially along the lead wire of 2.5Kg (0.8φ lead wire) , 1.0Kg (0.6φ lead
 wire) or 0.5Kg (0.45φ lead wire) for 30 sec.. The lead wire should not break or detached from the
 resistor and the change of the resistance should be ≦20mΩ.
 
 9.3.2 Torsional strength
 Equipment: Torsion tester
 Bend the terminal 6.4mm away from the body according to Fig-a to 90 degree with a curvature of
 0.75mm~0.80mm. The lead wire should be clamped at a point of 1.2mm away from the bending
 point by a fixture which can rotate 360 degree according to Fig-b. Rotate the resistor 360 degree
 clockwise and counter clockwise for 1 cycle. The rotation speed is 360 degree per 5 sec.. Perform
 3 cycles for the lead wire diameter of 0.8φ, 1.5 cycles for that of 0.6φ or 1 cycle for 0.45φ. The
 terminal should not break down or detached from the body. The acceptable change of resistance
 is ≦20mΩ.
  
 

 

 

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