DOCUMENT: SMD40000NH

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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 usedin electronic equipment.
2. Type Designation
RL2550H - □□□□(1)(2)(3)Where□(4)(1) Series No.
(2) H = H Type(3) Resistance value :For example - R002 = 2mΩ(4) Resistance tolerance
F = ± 1%G = ± 2%J = ± 5%

3. Outline Designation and Marking
3-1 Outline Designation
LR002W(1) Substrate(2) Resistor(3) Terminals(4) Protection coat(5) Marking

Alumina 96%
Cu alloy
Sn (on Cu )Heat resistive epoxy resin
Epoxy resin
Dimensions (mm)Code Letter
RL2550taa

5.0 ± 0.20LWat

2.5 ± 0.20
1.40 ± 0.25
(1~ 2mΩ) 0.60 ± 0.15(3mΩ) 0.45 ± 0.15

Figure 1. Construction and Dimensions

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SPECIFICATION FOR APPROVAL
3-2 MarkingEx.) 2mΩ → R002

Resistance value is marked on the top surface.
4. Ratings
4-1 Specification
Power Ratings*

1/2W

Resistance Value

1 ~ 3mΩTemperature Coefficient of Resistance±275ppm/℃

Resistance Tolerance±1% , ± 2% , ±5%

Insulation ResistanceOver 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
RATED LOAD(%)

derated in accordance with the following curve.
1000-5570170

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℃

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SPECIFICATION FOR APPROVAL
5. Characteristics
Test Item

Condition of Test

Requirements∆R : ± (0.5%+0.0005Ω)
Without significant damage byflashover ( spark, arching ), burningor breakdown etc.

Short Time Overload

2.5 * rated voltage for 5 seconds
Refer to JIS C 5201-1 4.13

Insulation Resistance

The resistor shall be cramped in theBetween Electrode and Protection
metal block and tested , as shown below. Film 100MΩ or over
Test voltage : 100 ± 15VDC for 1 minute Between Electrode and Substrate
Refer to JIS C 5201-1 4.6 Mounting
1,000MΩ or overcondition G.

Voltage Proof

The voltage : 100VAC (rms.) for 1 minute ∆R : ± (0.5%+0.0005Ω)
Refer to JIS C 5201-1 4.7
Without damage by flashover, fireor breakdown, as shown below.

Thermal Shock-55 ~125℃ 5 cycles, 15 min at eachextreme condition
Refer to JIS C 5201-1 4.19

∆R : ± (0.5%+0.0005Ω)
Without distinct damage inappearance

Low Temperature Storage

Kept at -55℃, 1,000 hours
Refer to JIS C 5201-1 4.23.4∆R : ± (0.5%+0.0005Ω)
Without distinct damage inappearance

High Temperature Exposure

Kept at 125℃ for 1,000 hours
Refer to JIS C 5201-1 4.23.2∆R : ± (0.5%+0.0005Ω)
Without distinct damage inappearance

Solderability

Temperature of Solder : 245 ± 5℃
Immersion Duration : 3 ± 0.5 second
Refer to JIS C 5201-1 4.17

Uniform coating of solder coverminimum of 95% surface being
immersed

Resistance to Soldering Heat

Dipped into solder at 270 ± 5℃
for 10 ± 1 seconds
Refer to JIS C 5201-1 4.18

∆R : ± (0.5%+0.0005Ω)
Without distinct deformation inappearance

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SPECIFICATION FOR APPROVAL
6. Recommend Land Pattern
L
D2550

W

LD

3.03

6.12

2.56

W
Cu Trace
Sensing Trace

Note : We recommend there is no circuit design between pads to avoid circuit short

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SPECIFICATION FOR APPROVAL
7. Packaging
7-1 Dimensions
7-1-1 Tape packaging dimensions
1.55 ± 0.05
0.23±0.10

4.0 ± 0.10

1.75 ± 0.10

2.0 ± 0.05

5.50 ± 0.05
5.35 ± 0.10
12.0 ± 0.30

1.05±0.10

4.0 ± 0.10

2.80 ± 0.10

1.50±0.1

Pulling direction
Unit : mm

7-1-2 Reel dimensions

13.0±0.5

4.00 +0- 0 .5

2.0±0.5

178.0±2.0
60.2±0.513.2±1.5

16.0±0.2
Unit : mm

SPECIFICATION FOR APPROVAL
7-2 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
Top Cover Tape

165 ~ 180°

0.1 ~ 0.7N

Carrier tape

7-3 Number of Taping
2,000 pieces / reel
7-4 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

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