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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)


  Metal Film Resistors (RN)

1. Scope of the coverage:
 This specification is pertinent to the application of fixed metal film resistors (designated as RN).
2 .Temperature range of the application:
 -55℃ ~ +155℃。
3.Type:
 Two types of fixed metal film resistors are available, one is normal size and the other one is small
 size. Except the color of S1/2W which is deep blue epoxy resin, the rest of the epoxy resin color is
 light blue.
 
4.Marking and illustration:
 The marking method for the fixed metal film resistor is color code which is shown in Fig.1.
±5%
±1%
 
 Illustration of color codes:

5%

Designation

1-st Band

(Sig. digit)

2-nd Band

(Sig. digit)

 

3-rd Band

(Multiplier)

4-th Band

(Tolerance)

1%

Designation

1-st Band

(Sig. digit)

2-nd Band

(Sig. digit)

3-rd Band

(Sig. digit)

4-th Band

(Multiplier)

5-th Band

(Tolerance)

Black
0
0
0
1
.
Brown
1
1
1
10
±1%(F)
Red
2
2
2
100
±2%(G)
Orange
3
3
3
1000
.
Yellow
4
4
4
10000
.
Green
5
5
5
100000
±0.5%(D)
Blue
6
6
6
1000000
±0.25%(C)
Purple
7
7
7
10000000
±0.1%(B)
Gray
8
8
8
.
±0.05%(A)
White
9
9
9
.
.
Gold
.
.
.
0.1
±5%(J)
Silver
.
.
.
0.01
±10%(K)
 
5.Dimension, voltage, resistance range: listed in the following Table
Type

Rated

Power

(W)

Resistance range (Ω)

Highest working

(V)

Highest Overload (V)

2
J ( ±5%)
L
ι
normal
1/8W
10~1M
200
400
3.5±0.5
1.7±0.3
27±3
0.45±0.05
normal
1/6W
10~1M
200
400
3.5±0.5
1.7±0.3
27±3
0.45±0.05
small
S1/4W
10~2.2M
200
400
3.5±0.5
1.7±0.3
27±3
0.45±0.05
normal
1/4W
10~2.2M
200
500
6.0±0.5
2.3±0.3
27±3
0.52±0.05
small
S1/2W
10~5.1M
250
500
6.0±0.5
2.3±0.3
27±3
0.52±0.05
normal
1/2W
10~5.1M
350
700
9.0±1.0
3.2±0.5
27±3
0.56±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 0.5mm.
 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 Rated voltage
 The rated voltage of a resistor is either a continuous DC voltage or an AC rms voltage which can
 be calculated by the following formula. If the calculated rated voltage is higher than the highest
 working voltage then the highest working voltage should be used as the rated voltage.
  P: Rated power (W) R: Nominal resistance (Ω) E: Rated voltage (V)
 
 7.3 Insulation resistance (Ref. JIS C5202 5.6)
 Equipment: Insulation resistance 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 100V from the tester for 1 min. and the measured resistance value should be larger than
 1,000MW.
 
 7.4 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.
Rated power
1/8W
1/6W
S1/4W
1/4W
S1/2W
1/2W
Voltage
300V
300V
300V
500V
500V
500V
 
 7.5 Short time overload (SOL) (Ref. JIS C5202 5.5)
 Equipment: S.O.L. tester.
 Apply 2.5 times of rated voltage to the resistors for 5 seconds. If the applied voltage is larger than
 the voltage listed in the following table, then the voltage in the table should be used instead. After
 the test, the sample should be stabilized at room temperature for 30 min. before the resistance is
 measured. The change of the resistance before and after the test should be:±(0.5%+0.05Ω).
Rated Power
1/8W
1/6W
S1/4W
1/4W
S1/2W
1/2W
Highest Voltage
400V
400V
400V
500V
500V
700V
 
 7.6 Intermittent overload (Applicable for nominal resistance larger than 100Ω) (Ref. JIS C5202 5.8)
 Equipment: Intermittent tester
 Put the resistor to a test fixture in a horizontal position, apply Y times of rated voltage for 1 sec. ON
 and 25 sec. OFF for times. After the test, take the sample out and stabilize at room
 temperature for 30 min. then measure its resistance. The acceptable change of resistance before
 and after the test is ±(1%+0.05Ω). The applied voltage should not exceed the value listed in the
 following table.
Rated power
1/8W
1/6W
S1/4W
1/4W
S1/2W
1/2W
Highest Voltage
400V
400V
400V
500V
500V
700V
Times (Y)
3
3
3
4
4
4
 
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 voltage 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 not exceed ±(1%+0.05Ω) and the appearance should show no
 remarkable abnormality and legibility of marking.
 
 8.2 Resistance to damp heat (Ref. To JIS C5202 7.2)
 Equipment: Constant temperature and humidity chamber
 The resistors are put in a 40±2℃ chamber with RH=90~95% for 240±4 hours. After the test, take
 the resistors out and stabilize in room temperature for 1 - 4 hour. Measure the resistance. The
 acceptable change of resistance should not exceed ±(1%+0.05Ω) and the appearance should
 show no remarkable abnormality and legibility of marking.
 
 8.3 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 voltage 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 not exceed
 ±(1%+0.05Ω) and the appearance should show no remarkable abnormality and legibility of
 marking.
 
 8.4 Resistance to heat (Ref. JIS C5202 7.2)
 Equipment: High temperature chamber
 Measure the resistance at room temperature. Put the resistors to 200℃ chamber for 2 hours. Take
 resistors out and stabilize at room temperature for 1 hour. Measure the resistance value. The
 change of the resistance before and after the test should be less than ±(2%+0.1Ω). The
 appearance should show no remarkable abnormality and legibility of marking.
 
 8.5 Temperature coefficient (TCR) (Ref. JIS C5202 5.2)
 Equipment: High temperature chamber
 Measure the resistance at room temperature. Put the resistor in a chamber with the temperature
 of RT+100℃ for 30 - 45 min. to stabilize. Measure the resistance again. Compare the resistance
 at these two temperatures with the following equation and the acceptable value is: ±100PPM/℃。
 
 R = Resistance at T T = RT + 100℃ Ro = Resistance at To  To =room temperature
 
 8.6 Temperature cycling (Ref. JIS C5202 7.4)
 Equipment: High temperature chamber, low temperature chamber
 Measure the resistance before the test. 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 +155 ℃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 ±(1%+0.05Ω). The appearance should show
 no remarkable abnormality and legibility of marking.
 
 8.7 Low temperature storage (Ref. JIS C5202 7.1)
 Equipment: Low temperature chamber
 Stabilize the resistor at room temperature for 30 min. then measure the resistance. Put the
 resistors into the chamber and gradually lower the temperature to -55±3℃ and maintain at that
 temperature for hours. Gradually raise the temperature of the chamber to room temperature
 and then take resistors out and stabilize at room temperature for 1 to 2 hours. Measure the
 resistance value. The change of the resistance before and after the test should be less than
 ±(1%+0.05Ω). The appearance should show no remarkable abnormality and legibility of marking.
 (Remove any water condensation on the resistor body during the test)
 
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 6±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 ±(0.5%+0.05Ω).
 
 9.2 Solderability (Ref. JIS C5202 6.5)
 Equipment: Solder bath
 Immerse part of the lead wire which is 3±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 0.5kg (0.45φlead wire),1.0kg (0.52φ,
 0.60φlead wire) for 30 sec.. The lead wire should not break or detached from the resistor and the
 change of the resistance should be less than ±(0.5%+0.05Ω).
 
 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
 0.45φ, 0.52φ lead wire 1 cycle, 0.60φ 1.5 cycles. The terminal should not break down or detached
 from the body. The acceptable change of resistance is ±(0.5%+0.05Ω).
  
 


 

 

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