DOCUMENT
REVISION
PAGE
: SMD40000NH
: A0
: 1 OF 6
SPECIFICATION FOR APPROVAL
1/2W, 2550, L Type Low Resistance Chip Resistor (Lead free / Halogen Free)
1. Scope
This specification applies to 2.5mm x 5.0mm size 1/2W, fixed metal foil current sensing resistors used
in electronic equipment.
2. Type Designation
RL2550
H -
□□□□
(1)
(2)
(3)
Where
(1) Series No.
(2) H = H Type
(3) Resistance value :
For example - -
R002 = 2mΩ
(4) Resistance tolerance
F =
±
1%
G =
±
2%
J =
±
5%
□
(4)
3. Outline Designation and Marking
3-1 Outline Designation
L
W
(1)
(2)
(3)
(4)
(5)
Substrate
Resistor
Terminals
Protection coat
Marking
Alumina 96%
Cu alloy
Sn (on Cu )
Heat resistive epoxy resin
Epoxy resin
Dimensions (mm)
R002
a
a
Code Letter
RL2550
t
L
W
a
t
5.0
±
0.20
2.5
±
0.20
1.40
±
0.25
(1~ 2mΩ) 0.60
±
0.15
(3mΩ) 0.45
±
0.15
Figure 1. Construction and Dimensions
DOCUMENT
REVISION
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: SMD40000NH
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: 2 OF 6
SPECIFICATION FOR APPROVAL
3-2 Marking
Resistance value is marked on the top surface.
4. Ratings
4-1 Specification
Power Ratings*
Resistance Value
Temperature Coefficient of Resistance
Resistance Tolerance
Insulation Resistance
Maximum Working Voltage (V)
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.
RATED LOAD(%)
100
Ex.) 2mΩ
→
R002
1/2W
1 ~ 3mΩ
±275ppm/℃
±1%
,
±
2% ,
±5%
Over 100MΩ
( P*R)
1/2
0
-55
70
170
AMBIENT TEMPERATURE(℃)
Figure 2.：Power Temperature Derating Curve
4-2 Rated Voltage
The rated voltage shall be determined by the following expression.
V
=
P
×
R
Where V：Rated voltage (V)
R：Nominal resistance value (Ω)
P：Rated dissipation (W)
4-3 Operation and Storage Temperature Range
-55℃ to
+170℃
DOCUMENT
REVISION
PAGE
: SMD40000NH
: A0
: 3 OF 6
SPECIFICATION FOR APPROVAL
5. Characteristics
Test Item
Short Time Overload
Condition of Test
2.5 * rated voltage for 5 seconds
Refer to JIS C 5201-1 4.13
Requirements
∆R
:
±
(0.5%+0.0005
Ω
)
Without significant damage by
flashover ( spark, arching ), burning
or breakdown etc.
Between Electrode and Protection
Film 100MΩ or over
Between Electrode and Substrate
1,000MΩ or over
Insulation Resistance
The resistor shall be cramped in the
metal block and tested , as shown below.
Test voltage : 100
±
15V
DC
for 1 minute
Refer to JIS C 5201-1 4.6 Mounting
condition G.
Voltage Proof
The voltage : 100V
AC
(rms.) for 1 minute
∆R
:
±
(0.5%+0.0005
Ω
)
Refer to JIS C 5201-1 4.7
Without damage by flashover, fire
or breakdown, as shown below.
-55 ~125℃ 5 cycles, 15 min at each
extreme condition
Refer to JIS C 5201-1 4.19
Kept at -55℃, 1,000 hours
Refer to JIS C 5201-1 4.23.4
∆R
:
±
(0.5%+0.0005
Ω
)
Without distinct damage in
appearance
∆R
:
±
(0.5%+0.0005
Ω
)
Without distinct damage in
appearance
∆R
:
±
(0.5%+0.0005
Ω
)
Without distinct damage in
appearance
Uniform coating of solder cover
minimum of 95% surface being
immersed
∆R
:
±
(0.5%+0.0005
Ω
)
Without distinct deformation in
appearance
Thermal Shock
Low Temperature Storage
High Temperature Exposure
Kept at 125℃ for 1,000 hours
Refer to JIS C 5201-1 4.23.2
Temperature of Solder : 245
±
5℃
Immersion Duration : 3
±
0.5 second
Refer to JIS C 5201-1 4.17
Dipped into solder at 270
±
5℃
for 10
±
1 seconds
Refer to JIS C 5201-1 4.18
Solderability
Resistance to Soldering Heat
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