CYNTEC CO., LTD.
乾坤科技股份有限公司
DOCUMENT : SR540000N
REVISION : A1
PAGE : 1 OF 8
2550 1/2W Low Resistance Chip Resistor
1. Scope
This specification applies to 2.5mm x 5.0mm size 1/2W, fixed metal film chip resistors rectangular type
for use in electronic equipment.
2. Type Designation
RL2550 H -
□□□□ -□N
(1) (2) (3) (4) (5)
Where (1) Series No.
(2) H = H Type
(3) Resistance value :
For example - -
R003 = 3mΩ
R100 = 100mΩ
(4) Resistance tolerance
F = ± 1%
G = ± 2%
J = ± 5%
(5) N = Sn plating (Lead free , RoHS compliant)
3. Outline Designation and Marking
3-1 Outline Designation
(1) Substrate Alumina 96%
(2) Resistor Ni-Cu alloy
(3) Terminals Sn (on Cu )
(4) Protection coat Heat resistive epoxy resin
(5) Marking Epoxy resin
Dimensions (mm)
Code Letter
RL2550
L 5.0 ± 0.20
W 2.5 ± 0.20
a 1.00 ± 0.15
t (＞3mΩ) 0.80 ± 0.15
(3mΩ) 0.95 ± 0.15
Figure 1. Construction and Dimensions
W
t
L
(Bottom View)
a a (1)
(2)
(3)
(4)
(5)
R003
CYNTEC CO., LTD.
乾坤科技股份有限公司
DOCUMENT : SR540000N
REVISION : A1
PAGE : 2 OF 8
3-2 Marking
Resistance value is marked on the top surface. Ex.) 47mΩ → R047
100mΩ → R100
4. Ratings
4-1 Specification
Power Ratings* 1/2W
Resistance Value** 1 ~ 50mΩ
Temperature Coefficient of Resistance (≤10mΩ) 100ppm/℃
(>10mΩ) 50ppm/℃
Resistance Tolerance ±1% , ± 2% , ±5%
Insulation Resistance Over 100MΩ
Maximum Working Voltage (V) ( P*R)1/2
Note * :
Power ratings is based on continuous full load operation at rated ambient temperature of 70℃.
For resistors operated at ambient temperature in excess of 70℃, the maximum load shall be
derated in accordance with the following curve.
Figure 2.：Power Temperature Derating Cure
4-2 Maximum over current
[]
msARI 10//50= Where I : maximum current 40A
R : Nominal resistance value (Ω)
Interval 60 seconds minimum
If maximum current so obtained exceed than 40A , use 40A as maximum current.
4-3 Operation and Storage Temperature Range
-55℃ to +125℃
0
70
100
125
-55
AMBIENT TEMPERATURE
()℃
RATED LOAD(%)
CYNTEC CO., LTD.
乾坤科技股份有限公司
DOCUMENT : SR540000N
REVISION : A1
PAGE : 3 OF 8
5. Schematic Diagram. Measurement Point
6. Life test
6-1 Electrical
6-1-1 Short Time Overload
Resistance Change : ± ( 0.5% + 0.0005Ω )
Without significant damage by flashover ( spark, arching ), burning or
breakdown etc.
Test voltage : 2.5 times the rated voltage.
Duration : 5 seconds
6-1-2 Insulation Resistance
(1) Between Electrode and Protection Film
100MΩ or over
(2) Between Electrode and Substrate
R0.5
Substrate
Protection Film
Pressure Rod
Measurement Point A
(Metal)
Test Sample
Spring
Insulation Prate
Metal Block
Measurement Point B
1,000MΩ or over
The resistor shall be cramped in the metal block and tested , as shown below.
Test voltage : 100 ± 15VDC for 1 minute
Refer to JIS C 5202 5.6 Mounting condition G.
Measurement Point
Schtemtic Diagram
I
V
VCurrent terminal
Voltage terminal
I
R047
I
V
CYNTEC CO., LTD.
乾坤科技股份有限公司
DOCUMENT : SR540000N
REVISION : A1
PAGE : 4 OF 8
6-2 Mechanical
6-2-1 Solderability
A new uniform coating of solder shall cover minimum of 95% of the surface
being immersed.
Temperature of solder : 245 ± 5℃
Immersion duration : 3 ± 0.5 seconds
6-2-2 Resistance to Soldering Heat
Resistance change : ± ( 0.5% + 0.0005Ω )
Electrical characteristics shall be satisfied.
Without distinct deformation in appearance
Dipped into solder for 10 ± 1 seconds at 270 ± 5℃
6-2-3 Substrate bending
Resistance change : ± ( 0.5% + 0.0005Ω )
Without mechanical damage such as breaks.
Electrical characteristics shall be satisfied.
Glass-Epoxy bard t = 1.6mm
Bending value : 2mm
Between the fulcrums : 90mm
CYNTEC CO., LTD.
乾坤科技股份有限公司
DOCUMENT : SR540000N
REVISION : A1
PAGE : 5 OF 8
6-3 Endurance
6-3-1 Rapid change of temperature
Resistance change : ± ( 0.5% + 0.0005Ω )
Without distinct damage.
Perform 5 cycles as follows :
-55℃ for 30minutes → room temperature for 3 minutes
→+125℃ for 30minutes → room temperature for 3 minutes
6-3-2 Endurance at 70℃
Resistance change : ± ( 0.5% + 0.0005Ω )
Without distinct damage.
Rated voltage for 1.5 hours followed by a pause 0.5 hour at a temperature of 70 ± 3℃.
Cycle shall be repeated for 1,000 hours.
6-3-3 Dump heat with load
Resistance change : ± ( 0.5% + 0.0005Ω )
The marking shall be legible.
60 ± 2℃ with relative humidity of 90% to 95%.
D.C. rated voltage for 1.5 hours ON 30 minutes OFF.
Cycle shall be repeated for 1,000 hours.
CYNTEC CO., LTD.
乾坤科技股份有限公司
DOCUMENT : SR540000N
REVISION : A1
PAGE : 6 OF 8
7. Recommend Land Pattern
C
D
B A
B'
VOLTAGE SENSE LINE
CURRENT LINE
SOLDER RESIST AREA
LAND PATTERN
0.50mm
A B B’ C D
3.1 2.75 1.4 7.0 3.05
Unit : mm
CYNTEC CO., LTD.
乾坤科技股份有限公司
DOCUMENT : SR540000N
REVISION : A1
PAGE : 7 OF 8
8. Packaging
8-1 Dimensions
8-1-1 Tape packaging dimensions
2.80 ± 0.10
1.05±0.10
0.23±0.10
5.35 ± 0.10
4.0 ± 0.10
4.0 ± 0.10 2.0 ± 0.05
Pulling direction
12.0 ± 0.30
1.75 ± 0.10
5.50 ± 0.05
Unit : mm
1.55 ± 0.05
1.50±0.1
8-1-2 Reel dimensions
13.0±0.5
178.0±2.0
60.2±0.5
13.2±1.5
2.0±0.5
+0.5
-0
4.00
16.0±0.2
Unit : mm
CYNTEC CO., LTD.
乾坤科技股份有限公司
DOCUMENT : SR540000N
REVISION : A1
PAGE : 8 OF 8
8-2 Peel Strength of Top Cover Tape
The peel speed shall be about 300mm/minute
The peel force of top cover tape shall between 0.1 to 0.7N
8-3 Number of Taping
2,000 pieces / reel
8-4 Label marking
The following items shall be marked on the reel.
(1) Type designation
(2) Quantity
(3) Manufacturing date code
(4) Manufacturer’s name
(5) The country of origin
165 ~ 180°
Top Cover Tape
Carrier tape
0.1 ~ 0.7N
