Metal Film Fixed Resistor:

3、Characteristics
Item Performance Test methodsConform toJIS C 5202)

Temperature Coefficient

Within ±100PPM/.

Comply with 5.2

 

R0: Resistance value at room temp.( T0).
R1:Resistance value at room temp.plus 100 (T1)

Short time overload

Within ±(0.5%+0.05Ω).
No evidence of mechanical damage.

Comply with 5.5
 
Rated voltage×2.5 times,5s
But not to exceed maximum overload voltage. (See table-1)

Insulation Resistance

104MΩ or more.

Comply with 5.6
 
V-block method, Resistor shall be tested at DC 500V for 60 seconds.

Dielectric Withstanding Voltage

No evidence of flashover mechanical damage, arcing  or insulation breakdown.

Comply with 5.7
Constant pressure, V-block method, Resistor shall be tested at AC potential respectively for 60 seconds.(See table-1)

Pulse overload

Within ±(1%+0.05Ω)

Comply with 5.8
Rated voltage X 4 times, 10000 cyc.(1s ON, 25s OFF)
But not to exceed maximum pulse voltage.(See table-1)

Terminal strength

No evidence of mechanical damage.

Comply with 6.1

Tensile strength

Diameter(mm)

Tensile force N(kg)

Time

Φ0.38mm~0.50mm

5(0.51)

10±1second

Φ0.50mm~0.70 mm

10(1.02)

Torsion strengthTo bend the lead wire at the point of about 6mm~6.5mm from resistor body. about 0.75mm curvature radii to 90°then catch the wire at 1.2±0.4mm apart from the bend point end and turn it ( clockwise ) by 360 degrees perpendicular to the resistor axis at speed of same 5 seconds per turn, and do the same counterclockwise again which constitute a whole turn. Repeat the turn for 2 times without causing any break and looseness.

Resistance to soldering heat

Within ±(0.5%+0.05Ω)
No evidence of mechanical damage.

Comply with 6.4
350±10,3±1.0s, After test leave for 0.5h.
Solderability

Covered with new solder by 95% at least.

Comply with 6.5
Test temperature of solder: 230±5
Dipping time in solder:3±1.0 s
Resistance to solvent

No deterioration of protective coating and markings.

Comply with 6.9
Specimens shall be immersed in a bath of isoproalcohol completely for 3 minutes with ultrasonic.
Temperature cycle

Within ±(1%+0.05Ω)
No evidence of mechanical damage.

Comply with 7.4
Low side-55/30min, Room temp.10 to 15min
High side80/30min, Room temp.10 to 15min
5 cycles
Load life in humidity

Within ±(2%+0.05Ω)

Comply with 7.9
40±2, 90 to 95%RH, 1000h
Rated voltage (90 min ON, 30 min OFF)
Load life

Within ±(2%+0.05Ω)

Comply with 7.10
70±3, 1000h
Rated voltage (90 min ON, 30 min OFF)
2、Construction
2.5、Indication
    
The indication shall be satisfied with4、Indication
2.4、Resistor body color
    
Table-2
Normal size

Small size

Type Color Type Color
MF1/8W,MF1/4W,
MF1/2W,MF1W,
MF2W, MF3W
Blue MF1/4WS,MF1/2WS,
MF1WS,MF2WS,
MF3WS, MF5WS
Blue
2.3、Terminal caps
           
The caps shall be securely connected with the resistor element electrically and mechanically.
2.2、Structure diagram
No Item Material
1 Ceramic core

High alumina ceramic is used.

2 Resistor element

The resistor element shall consist of metal film.

3 Terminal Tinned iron cap.
4 Connection The lead wire, which is plated with solder, shall be mounted to the caps by welding process.
5 Lead wire Soldered or tinned annealed wire.
6 Undercoat painting Electric insulation resin.
7 Finishing painting Epoxy resin is used.
8 Indication Color code.

     The construction of resistor (MF series) shall be as follows:

 

2.1、External dimensions
            The dimensions shall be satisfied with5、External dimensions
1、General
1.4、Rated voltage
    
The rated voltage shall be the D.C. or A.C.(R.M.S. at power frequency) voltage which corresponds the rated power and the value of which is calculated from the formula below

     E=(PxR)  Where E:Rated voltage(V)   P:Rated power(W)   R: Nominal resistance(Ω)

1.3、Rated power
    
Rated power is maximum power which can be continuously loaded at specified ambient temperature 70,as Table-1;however when the ambient temperature exceeds 70,rated power should be determined from the derating curve of Fig.1.
Figure 1  Power derating curve
Table-1
Type Rated power

Maximum working voltage

Maximum overload voltage

Dielectric withstanding voltage

Resistance RangeΩ

MF1/8W 0.125W 150V 250V 300V 0Ω~1MΩ
MF1/4W 0.25W 250V 300V 500V 0Ω~10MΩ
MF1/2W 0.5W 350V 500V 700V 0Ω~10MΩ
MF1W 1W 500V 800V 1000V 0.11Ω~10MΩ
MF2W 2W 500V 800V 1000V 0.1Ω~10MΩ
MF3W 3W 500V 1000V 1000V 0.1Ω~10MΩ
           
MF1/4WS 0.25W 250V 250V 300V 0Ω~10MΩ
MF1/2WS 0.5W 350V 400V 500V 0Ω~10MΩ
MF1WS 1W 500V 500V 700V 0Ω~10MΩ
MF2WS 2W 500V 600V 1000V 0.1Ω~10MΩ
MF3WS 3W 500V 800V 1000V 0.1Ω~10MΩ
MF5WS 5W 500V 800V 1000V 0.1Ω~10MΩ

 

1.2、Type designation (example)
    
The type designation shall be in the following form and as specified.

MF

Type

1/4W

Rated power
Normal Small
1/8W 1/4WS
1/4W 1/2WS
1/2W 1WS
1W 2WS
2W 3WS
3W 5WS
5W

10K

Nominal resistance value

E-24 Series
E-96 Series

 

±5%

Resistance tolerance

J

±5%

G

±2%

F

±1%

D

±0.5%

T/B

Form

P Tyepe
MB Type
M Type
MKK Type
F Type
FK Type
FKK Type

 

1.1、Scope
    
This specification is available for Metal Film Fixed Resistor manufactured by FONG YA ELECTRONIC(DONG GUAN)CO.,LTDit accords with RoHS test of Environment related substance requirement.
6、Package
6.2 Tape in box Bulk  (Ammo Bulk)
6.2.2 Packing box size and quantity
Type Form Quantity Dimensions (mm)
Normal Size Small Size L W H
MF1/8W MF1/4WS P 20000 PCS 250 140 80
Molding 20000 PCS 250 140 80
MF1/4W MF1/2WS P 10000 PCS 250 140 80
Molding 10000 PCS 250 140 80
MF1/2W MF1WS P 3000 PCS 200 130 80
Molding 5000 PCS 200 130 80
MF1W MF2WS P 1000 PCS 200 130 80
Molding 2000 PCS 200 130 80
MF2W MF3WS P 1000 PCS 200 130 80
Molding 1000 PCS 200 130 80
MF3W MF5WS P 250 PCS 200 130 80
Molding 250 PCS 200 130 80
6.2.1 Indication

  (1)Product specification

     (2)Quantity

6.1 Tape in box packing  (Ammo packing)
6.1.2 Packing box size and quantity
Type Form Quantity Dimensions (mm)
Normal Size Small Size L W H
MF1/8W MF1/4WS T26 5000 PCS 260 50 67
T52 5000 PCS 260 80 75
MF1/4W MF1/2WS T26 5000 PCS 260 50 100
T52 5000 PCS 260 85 110
MF1/2W MF1WS T52 2000 PCS 260 80 85
MF1W MF2WS T52 1000 PCS 260 80 85
T63 1000 PCS 260 90 85
MF2W MF3WS T73 1000 PCS 260 100 100
MF3W MF5WS T73 500 PCS 260 100 100
6.1.1 Indication

   (1)Product specification

   (2)Quantity

 

 

 

 

 

5、External dimensions
5.4 F Type & FK Type& FKK Type
FKK
Watts Dimensions(mm)
D±1.0 L±1.0 P±1.0 E Max H1±1.0 H2±1.0
1/2W,1WS 3.2 9.0 8.0 3.5 5.0 4.0
1W,2WS 4.5 11.0 8.0 3.5 6.0 4.0
2W,3WS 5.0 15.0 8.0 3.5 6.0 4.0
3W 6.0 17.0 8.0 3.5 6.0 4.0
FK
Watts

Dimensions(mm)

D±1.0 L±1.0 P±2.0 E Max H±1.0
1/4W,1/2WS 2.3 6.5 6 3.5 5-8
1/2W,1WS 3.2 9.0 8 3.5 5-8
1W,2WS 4.5 11.0 8 3.5 5-8
2W,3WS 5.0 15.0 8 3.5 5-8
3W 6.0 17.0 8 3.5 5-8
F
Watts

Dimensions(mm)

D±1.0 L±1.0 P±2.0 E Max H±1.0
1/4W,1/2WS 2.3 6.5 6 3.5 5-8
1/2W,1WS 3.2 9.0 8 3.5 5-8
1W,2WS 4.5 11.0 8 3.5 5-8
2W,3WS 5.0 15.0 8 3.5 5-8
3W 6.0 17.0 8 3.5 5-8
5.3 MB Type &M Type&MKK Type

MKK

Watts Dimensions(mm)
D±1.0 L±1.0 P±1.0 H±1.0 H1±1.0
1/2W,1WS 3.2 9.0 12.5 7 5
1W,2WS 4.5 11.0 15 7 5
2W,3WS 5.0 15.0 20 7 5
M
Watts

Dimensions(mm)

D L P±1.0 H±1.0
1/8W,1/6W 1.7±1.0 3.5±1.0 5 8
1/4W,1/2WS 2.3±1.0 6.5±1.0 10 8
1/2W,1WS 3.2±1.0 9.0±1.0 12.5 8
1W,2WS 4.5±1.0 11.0±1.0 15 10
2W,3WS 5.0±1.0 15.0±1.0 20 10
3W 6.0±1.0 17.0±1.0 25 10
MB

Watts

Dimensions(mm)

D±1.0 L±1.0 P±1.0 H1±1.0 H2±1.0 t±0.15 qMax
1/2W,1WS 3.2 9.0 12.5 7 5 1.2 3
1W,2WS 4.5 11.0 15 7 5 1.25 3
2W,3WS 5.0 15.0 20 7 5 1.25 3
Type

Taping

Dimensions(mm)

Normal Size Small Size L W P L1-L2
Max.
T Z
Max.
R
Max.
t
Max.
e
Max.
S
Max.
MF1/8W MF1/4WS T26 3.5±1.0 26±1.0 5±0.5 0.5 6±0.5 1.2 0 3.0 0.6 0.5
T52 3.5±1.0 52±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5
MF1/4W MF1/2WS T26 6.5±1.0 26±1.0 5±0.5 0.5 6±0.5 1.2 0 3.0 0.6 0.5
T52 6.5±1.0 52±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5
MF1/2W MF1WS T52 9.0±1.0 52±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5
MF1W MF2WS T52 11.0±1.0 52±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5
T63 11.0±1.0 63±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5
MF2W MF3WS T73 15.0±1.0 73±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5
MF3W MF5WS T73 17.0±1.0 73±1.0 10±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5

5.2 Axial Lead Taping

5.1 P type

Type

Dimensions(mm)
Normal Size Small Size L D d H
MF1/8W MF1/4WS 3.5±1.0 1.7±1.0 0.40±0.05 27.0±2.0
MF1/4W MF1/2WS 6.5±1.0 2.3±1.0 0.48±0.05 26.0±2.0
MF1/2W MF1WS 9.0±1.0 3.2±1.0 0.52±0.05 25.0±2.0
MF1W MF2WS 11.0±1.0 4.5±1.0 0.70±0.05 30.0±2.0
MF2W MF3WS 15.0±1.0 5.0±1.0 0.70±0.05 33.0±2.0
MF3W MF5WS 17.0±1.0 6.0±1.0 0.70±0.05 33.0±2.0

 

4、IndicationColor Code

 

 

Explanation of part number

Product ldentification