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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
Content
Index.......................................................................................................................................................................................Page
1.0 Scope.....................................................................................................................................................................................4
2.0 Ratings and dimension.................................................................................................................................................4
3.0 Structure.............................................................................................................................................................................5
4.0 Mark......................................................................................................................................................................................5
5.0 Derating curve..................................................................................................................................................................6
6.0 Voltage rating....................................................................................................................................................................6
7.0 Specification......................................................................................................................................................................7
8.0 Explanation of Part No. System................................................................................................................................8
9.0 Order procedure..............................................................................................................................................................9
10.0 Standard packing.........................................................................................................................................................10
11.0 Note...................................................................................................................................................................................13
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
File Name:
Date
Edition No.
Amendment Record
Edition
Description
Page
Signature
Date
Amended by
Checked by
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
1.0 Scope
This file is the specification for Lead-Free Metal Film Fixed Resistors manufactured by UNIOHM.
2.0 Ratings DQG dimensions
For 1/8W, 1/4WS, 0.4WSS
2.1
Other
Normal size
D
L
d±0.05
H±3
Max
Working
Voltage
MF 1/8W
1.9±0.3
3.3±0.3
0.45
28
200V
400V
400V
MF 1/4W
2.2±0.3
6.5±1.0
0.54
28
250V
500V
500V
MF 1/2W
3.0±0.6
9.5±1.0
0.54
28
350V
700V
700V
MF 1W
4.5±0.6
11.5±1.0
0.65
28
500V
1000V
1000V
MF 2W
5.0±0.6
15.5±1.0
0.70
28
500V
1000V
1000V
MF 3W
6.0±0.6
17.5±1.0
0.75
28
500V
1000V
1000V
Max
Overload
Voltage
Dielectric
Withstanding
Voltage
400V
200V
Dimension(mm)
Type
2.2
D
L
d±0.05
H±3
Max
Working
Voltage
1.9±0.5
3.3±0.3
0.45
28
200V
Dimension(mm)
MF 0.4WSS
Dielectric
Withstanding
Voltage
Tolerance
±1%Ε±2%
±5%
±1%Ε±2%
±5%
±1%Ε±2%
±5%
±1%Ε±2%
±5%
±1%Ε±2%
±5%
±1%Ε±2%
±5%
Resistance
Range
Small Size & ultra Small Size
Type
MF 1/4WS
Max
Overload
Voltage
1.9±0.5
3.3±0.3
0.45
28
200V
400V
200V
Tolerance
Resistance
Range
±1%Ε±2%
±5%
±1%Ε±2%
±5%
±1%
±2%Ε±5%
±1%Ε±2%
±5%
±1%
±2%Ε±5%
MF 1/2WSS
2.2±0.5
6.5±0.5
0.54
28
250V
500V
250V
MF 1/2WS
2.7±0.5
9.0±1.0
0.54
28
350V
700V
700V
MF 0.6WS
2.2±0.5
6.5±1.0
0.54
28
250V
500V
250V
MF 1WS
3.5±0.6
9.5±1.0
0.60
28
350V
700V
350V
±1%Ε±2%Ε±5%
10
MF 2WS
4.0±0.6
11.5±1.0
0.65
28
500V
1000V
350V
±1%Ε±2%Ε±5%
MF 3WS
5.0±0.6
15.5±1.0
0.70
28
500V
1000V
350V
±1%Ε±2%Ε±5%
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
3.0 Structure
No.
Name
Material
1
Basic body
Rod type ceramics
2
Resistance layer
Metal Film
3
End cap
Cold steel plated with copper/tin
4
Lead wire
Tin solder coated copper wire
5
Joint
By Welding
6
1.
Inner paint: Celluloid resin
2.
Outer paint:
Coating
2.1 Inflammable resin for normal size and 1/2W small size: Blue
2.2 Non-inflammable resin for other small size: Light Green
2.3 Non-inflammable resin for ultra-small size-0.4WSS: Deep Green
7
Color bands
Epoxy resin
4.0 Mark
Resistors shall be marked with color bands which in accordance with JIS C 0802
For 1/8W, 1/4WS, 0.4WSS (±1%)
Another
For 1/8W,1/6W,1/4WS,0.4WSS (±2%, ±5%)
Another
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
4.1
Label:Label includes following items:
Example:
4.1.1 Type and style
METAL FILM FIXED RESISTORS
4.1.2 Nominal resistance
WATT: 2W
VAL:200K:
4.1.3 Resistance tolerance
Q’TY: 1,000
TOL: 1%
4.1.4 Quantity
LOT: 3021548
PPM: 50
4.1.5 Lot. No.
4.1.6 TCR: PPM
5.0 Derating curve:
Resistors shall have a power rating based on continuous load operation at an ambient temperature
from -
If temperature is above
Figure1
6.0 Voltage rating:
Resistors should have a power rating based on direct-current (DC) continuous voltage rating and an
alternating-current (AC) continuous voltage rating which calculating formula shown as below:
RCWV = !
RCWV: Rated DC or RMS AC continuous working voltage (Volt.)
P:
Power Rating (Watt.)
R:
Nominal Resistance (Ohm)
Resistors will be burned out if it overload, such as higher than the maximum value of series’ RCWV.
And we named 2.5 times RCWV is OVERLOAD Voltage.
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
7.0 Specification
,WHP
Temperature
Coefficient
Limits
f0.1%
f15 ""# $
f0.25%
f25 ""# $
f0.5%
f50""# $
±1%
r""# $
±2%
r""# $
±5%
r>""# $
Test Method (JIS-C-5201&5202)
4.8 Natural resistance changes per temp. Degree centigrade
R ' * R+
10; (PPM/ )
R+ (T' * T+ )
R1: resistance value at room temp. (T1)
?
Y
[
\
\]
^
_` >j
`
] ?
\
\]
_`j
\
\]
^ _`>j
Short-time
overload
Resistance change rate is:
q_{^j$
|
[Y
mechanical damage.
4.13 Permanent resistance change after the application of a
potential of 2.5 times RCWV for 5 seconds.
Dielectric
withstanding
voltage
No evidence of flashover mechanical
damage, arcing or insulation break down.
4.7 Resistors shall be clamped in the trough of a 90qmetallic
v-block and shall be tested at ac potential respectively specified in
the above list for 60-70 seconds.
Pulse overload
Resistance to
soldering heat
Resistance to
solvent
Terminal strength
Resistance change rate is:
r (1%+0.05:) Max. With no evidence of
mechanical damage.
Resistance change rate is:
r (1%+0.05:) Max. With no evidence of
mechanical damage
No deterioration of protective coatings &
markings
No evidence of mechanical damage
Solderability
95% coverage Min.
Temperature
cycling
Resistance change rate is:
q_{^j
$
With no evidence of
mechanical damage.
Load life in
humidity
Normal type:
±1.5%;
flame retardant type: ±5%
Load life
Normal type: ±1.5%;
flame retardant type: ±5%
4.28 Resistance change after 10,000 cycles (1 second “ON ”, 25
seconds “OFF ”) at 4 times RCWV.
4.18 Permanent resistance change when leads immersed to a point
2.0-2.5mm from the body in
260 r5 solder for 10±1 seconds.
4.29 Specimens shall be immersed in a bath of trichloroethylene
completely for 3 min. With ultrasonic
4.16 Direct load:
Resistance to a 2.5 kg direct load for 10 seconds in the direction of
the longitudinal axis of the terminal leads.
Twist test:
Terminal leads shall be bent through 90qat a point of about 6mm
from the body of the resistor and shall be rotated through 360q
about the original axis of the bent terminal in alternating direction
for a total of 3 rotations.
4.17 The area covered with a new, smooth, clean, shiny and
continuous surface free from concentrated pinholes.
`
\]
~
?> q
\
?
>Y
4.19 Resistance change after continuous five cycles for duty cycle
specified:
Step
Temperature
Time
1
-
q
30min
2
Room temp.
10 – 15min
3
^
q
>
30min
4
Room temp.
10 – 15min
7.9 resistance change after 1,000 hours (1.5 hours “ON”,0.5 hour
~j
and 90 to 95% relative humidity.
4.25.1 permanent resistance change after 1,000 hours operating at
RCWV with duty cycle of 1.5 hours “ON”, 0.5 hour “OFF” at
q>
\
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
8.0 Explanation of Part No. System:
The standard Part No. includes 14 codes which explained as below:
8.1
1st
th codes: Item type
8.1.1 The 1st to 3rd codes: Product type;
8.1.2 The 4th code: Special feature.
Example: MFRF= Metal Film Fixed Resistors Non-flame type;
8.2
5thth codes: Power rating.
8.2.1 W=Normal Size; S=Small Size; U=Ultra Small Size;
#|#>|
_І1W )
Wattage
1/2
1/3
1/4
1/5
1/6
1/8
0.6
0.4
Normal Size
W2
W3
W4
W5
W6
W8
/
/
Small Size
S2
S3
S4
S5
S6
S8
06
/
Ultra-Small Size
U2
U3
U4
U5
U6
U8
/
04
||
_|
j
Wattage
1
2
3
5
7
8
9
10
15
Normal Size
1W
2W
3W
5W
7W
8W
9W
AW
FW
Small Size
1S
2S
3S
5S
7S
8S
9S
AS
FS
Ultra-Small Size
1U
2U
3U
5U
7U
8U
9U
AU
8.2.2 If power rating is less than 1 watt,
5th
code would be the letters W, S or U and
FU
6th
code would
be a number or a letter code.
Example: WA=1/10W; U2=1/2W-SS.
8.2.3 If power rating is between 116 watt, 5th code would be a number or a letter code and 6th
code will be the letters of W, S or U.
Example: AW=10W; 3S=3W-S
8.3
7th
code: Resistance Tolerance.
B=±0.1% C=±0.25%
8.4
8th
11th
D=±0.5%
F=±1%
G=±2%
codes: Resistance Value
8.4.1 If resistance value belongs to E-24 series:
8.4.1.1 8th code must be “0”
8.4.1.2 9th & 10th codes: Significant figures of the resistance;
8.4.1.3 11th code: Power of ten.
8.4.2 If resistance value belongs to E-96 series:
8.4.2.1 8th 10th codes: Significant figures of the resistance
8.4.2.2 11th code: Power of ten.
J=±5%
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
8.4.2.3 We use this code in 11th code:
8.5
0=100
1=101
2=102
3=103
J=10-1
K=10-2
L=10-3
M=10-4
4=104
5=105
12th14th codes.
8.5.1 12th code: Packaging Type
A=Tape/Box (Ammo pack)
B=Bulk/Box
T=Tape/Reel P=Tape/Box of PT-26
8.5.2 13th code: Packing Quantity of Tape/Box & Tape/Reel packaging types.
A=500pcs
B=2500pcs
1=1000pcs 2=2000pcs
8.5.3 If product is FORMED, 13th14th codes are forming types
MF=M-type with flattened lead wire
F0= F-type
MK= M-type with kinked lead wire
F1= F1-type
ML= M-type with normal lead wire
F2= F2-type
MC= M type with kinked lead and narrow pitch wire
F3= F3-type
8.5.4 14th code: Special features of additional information
P=Panasert type
1=Avisert type 1
2=Avisert type 2
3=Avisert type 3
A=Cutting type CO 1/4W-A type
B= Cutting type CO 1/4W-B typ
9.0 Order procedure ( Example: MFR 2W ±1% 200K
`#-1000 )
M
F
R
0
Product Type:
MFR=Metal film
fixed resistors
Special Features:
0= Standard product
F= Flame Retardant
I= Non-inductive
2
W
Wattage:
Normal size:
W8=1/8W
W4=1/4W
W2=1/2W
1W=1W
2W=2W
3W=3W
Small size:
S4=1/4W-S
S2=1/2W-S
06=0.6W-S
1S=1WS
2S=2WS
3S=3WS
Extra small size:
U2=1/2WSS
04=0.4WSS
F
2
0
0
3
Resistance Value:
±1%Ε±2% series:
1st 3rd codes: Significant
figures of the resistance
4th code: Power of ten
Example: > =2002
±5% series:
1st code:”0”;
2nd 3rd codes: Significant
figures of the resistance
4th code: Power of ten.
Example: >=0203
J=10-1; K=10-2; L=10-3
Tolerance (& TCR):
B=f0.1%f15PPM
F=±1% ±50PPM
C=f0.25%f25PPM G=±2% ±100PPM
D=f0.5%f50PPM
J=±5% ±200PPM
A
1
0
Packing quantity:
10=1,000pcs
20=2,000pcs
30=3,000pcs
40=4,000pcs
50=5,000pcs
A0=500pcs
B0=2,500pcs
Forming type:
MF=MB- type
MK=MK type
MC=MC-type
ML=M type
F0=F type
F1=F1 type
F2=F2 type
F3=F3 type
Packing Type:
A=Tape/Box
T=Tape/Reel
B=Bulk/Box
P=Tape/Box of PT-26 product
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
10.0 Standard Packing:
10.1 Tapes in Box Packing
Dimension of T/B (mm)
Part No.
O
P
A±5
B±5
C±5
Qty/Box
MF 1/8W
52±1
5±0.3
75
70
255
5,000pcs
MF 1/4WS
52±1
5±0.3
75
70
255
5,000pcs
MF 1/4W
52±1
5±0.3
75
98
255
5,000pcs
MF 0.4WSS
52±1
5±0.3
75
70
255
5,000pcs
MF 1/2WSS
52±1
5±0.3
75
116
255
5,000pcs
MF 1/2WS
52±1
5±0.3
75
70
255
2,000pcs
MF 1/2W
52±1
5±0.3
75
45
255
1,000pcs
MF 0.6WS
52±1
5±0.3
75
116
255
5,000pcs
MF 1WS
58±1
5±0.3
80
70
255
1,000pcs
MF 1W
58±1
5±0.3
80
82
255
1,000pcs
MF 2WS
58±1
5±0.3
80
82
255
1,000pcs
MF 2W
65±5
10±0.5
90
88
255
1000pcs
MF 3WS
65±5
10±0.5
90
119
255
1000pcs
MF 3W
65±5
10±0.5
90
88
255
500pcs
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
10.2 Tapes in Reel Packing
Dimension of Reel (mm)
Part No.
A
W±5
H±5
L±5
Qty/Box
MF 1/8W
73±2
85
295
293
5,000pcs
MF 1/4WS
73±2
85
295
293
5,000pcs
85
295
293
5,000pcs
85
295
293
5,000pcs
MF 1/4W
MF 0.4WSS
73±2
73±2
MF 1/2WSS
73±2
85
295
293
5,000pcs
MF 1/2WS
73±2
85
295
293
4,000pcs
MF 1/2W
73±2
85
295
293
4,000pcs
MF 0.6WS
73±2
85
295
293
5,000pcs
MF 1WS
73±2
85
295
293
2,500pcs
MF 1W
73±2
85
295
293
2,500pcs
MF 2WS
73±2
85
295
293
2,500pcs
MF 2W
80±5
95
295
293
1,000pcs
MF 3WS
80±5
95
295
293
1,000pcs
MF 3W
80±5
95
295
293
1,000pcs
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
10.3 Bulk in Box Packing
Dimension of Box (mm)
Part No.
A±5
B±5
C±5
Qty/Box
MF 1/8W
140
80
240
1,000/20,000pcs
MF 1/4WS
140
80
240
1,000/20,000pcs
MF 1/4W
140
80
240
500/20,000pcs
MF 0.4WSS
140
80
240
1,000/20,000pcs
MF 1/2WSS
140
80
240
500/10,000pcs
MF 1/2WS
140
80
240
500/8,000pcs
MF 1/2W
140
80
240
250/2,000pcs
MF 0.6WS
140
80
240
500/10,000pcs
MF 1WS
140
80
240
200/4,000pcs
MF 1W
140
80
240
100/2,500pcs
MF 2WS
140
80
240
100/2,500pcs
MF 2W
140
80
240
100/1,500pcs
MF 3WS
140
80
240
100/1,500pcs
MF 3W
140
80
240
100/1,500pcs
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UNIROYAL ELECTRONICS INDUSTRY CO., LTD.
11.0 Note
11.1 UNIOHM strongly recommend the storage condition:
T\] ?
; H \
?>{
{
Even under storage condition UNIOHM recommended, solderability of products over 1 year
would be still degraded.
11.2 Store / transport cartons in the correct direction, otherwise bent leads would be occurred due to
excessive stress applied when dropping of a carton.
11.3 Product performance and soldered connections may deteriorate if the products are stored in the
following places.
11.3.1 In high electrostatic;
11.3.2 In direct sunshine, rain, snow or condensation;
11.3.3 Exposed to sea winds or corrosive gases which contains Cl2, H2S, NH3, SO2, and NO2
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