3/4W, 2010 Low Resistance Chip Resistor
1. Scope
This specification applies to 2.5mm x 5.0mm size 3/4W, fixed metal film chip resistors
rectangular type for use in electronic equipment.
2. Type Designation
RL2550L- □□□□

□

(1)

(2)

(3)

(4)

Where

(1) Series No.
(2) L = L Type(3) Resistance value :For example - R005 = 5mΩ
R050 = 50mΩ
(4) Resistance tolerance
F = ± 1%G = ± 2%J = ± 5%

3. Outline Designation and Marking
3-1 Outline Designation(1) Substrate(2) Resistor(3) Terminals(4) Protection coat(5) Marking(5)L(4)(3)R005

W

Alumina 96%
Ni alloy
Sn (on Cu )Heat resistive epoxy resin
Epoxy resinDimensions (mm)(2)

Code Letter
RL2550t(Bottom View)a

UNLESS OTHERWISE SPECIFIEDTOLERANCES ON ﹕
X
=±X.X
=±
X.XX = ±ANGLES ± HOLE DIA. ±a

5.0 ± 0.20

L(1)

2.5 ± 0.20
1.00 ± 0.15(＞3mΩ) 0.80 ± 0.15t(3mΩ) 0.95 ± 0.15
Figure 1. Construction and Dimensions
WaDRAWNBY ﹕connie 4/3/13

DESIGNED BY ﹕CHECKEDBY ﹕APPROVED BY ﹕SCALE ﹕ X

UNIT ﹕ X

Engineering Spec. For 3/4W 2010
TITLE : TheLow Resistance Chip Resistor

台達電子工業股份有限公司
Delta Electronics, Inc.
THIS DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF Delta Electronics, Inc.
AND SHALL NOT BE REPRODUCED OR USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSIONDOCUMENTNO.

SR550000N
PAGE 1

OF 8PAGE
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A2

3-2 Marking
Resistance value is marked on the top surface.

Ex.)

5mΩ → R005
47mΩ → R047

4. Ratings
4-1 Specification
Power Ratings*

3/4W

Resistance Value

4 ~ 50mΩTemperature Coefficient of Resistance(≤10mΩ) 100ppm/℃(>10mΩ) 50ppm/℃

Resistance Tolerance±1% , ± 2% , ±5%

Insulation ResistanceOver 100MΩ

Maximum Working Voltage (V)( P*R)1/2

Note * :RATED LOAD(%)

Power ratings is based on continuous full load operation at rated ambient temperature of70℃. For resistors operated at ambient temperature in excess of 70℃, the maximum
load shall be derated in accordance with the following curve.
100070-55125AMBIENT 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+125℃

UNLESS OTHERWISE SPECIFIEDTOLERANCES ON ﹕X
=±
X.X
=±
X.XX = ±ANGLES ± HOLE DIA. ±DRAWN

BY ﹕connie 4/3/13

DESIGNED BY ﹕CHECKEDBY ﹕APPROVED BY ﹕SCALE ﹕ X

UNIT ﹕ X

Engineering Spec. For 3/4W 2010
TITLE : The
Low Resistance Chip Resistor

台達電子工業股份有限公司
Delta Electronics, Inc.
THIS DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF Delta Electronics, Inc.
AND SHALL NOT BE REPRODUCED OR USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSIONDOCUMENTNO.

SR550000N
PAGE 2OF 8

PAGE
REV.

A25. Schematic Diagram. Measurement Point
Measurement Point

Schtemtic Diagram

VR047

I

UNLESS OTHERWISE SPECIFIEDTOLERANCES ON ﹕X=±
X.X=±X.XX = ±ANGLES ± HOLE DIA. ±DRAWN

BY ﹕connie 4/3/13

DESIGNED BY ﹕CHECKEDBY ﹕APPROVED BY ﹕SCALE ﹕ XUNIT ﹕ X

Engineering Spec. For 3/4W 2010
TITLE : The
Low Resistance Chip Resistor

VIV

Current terminal

I

Voltage terminal

台達電子工業股份有限公司
Delta Electronics, Inc.
THIS DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF Delta Electronics, Inc.
AND SHALL NOT BE REPRODUCED OR USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSIONDOCUMENTNO.

SR550000N
PAGE 3

OF 8PAGE
REV.

A2

6. 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 : ± (1.0%+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 : ± (1.0%+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 : ± (1.0%+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

UNLESS OTHERWISE SPECIFIEDTOLERANCES ON ﹕
X
=±
X.X
=±
X.XX = ±ANGLES ± HOLE DIA. ±DRAWN

BY ﹕connie 4/3/13

DESIGNED BY ﹕CHECKEDBY ﹕APPROVED BY ﹕SCALE ﹕ X

UNIT ﹕ XEngineering Spec. For 3/4W 2010
TITLE : The
Low Resistance Chip Resistor

台達電子工業股份有限公司
Delta Electronics, Inc.
THIS DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF Delta Electronics, Inc.
AND SHALL NOT BE REPRODUCED OR USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSIONDOCUMENTNO.

SR550000N
PAGE 4

OF 8

PAGE
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A2

Test Item

Condition of Test

Requirements

Load Life

Rated voltage for 1.5 hours followed by apause 0.5 hour at 70 ± 2℃.
Cycle repeated 1000 hours
Refer to JIS C 5201-1 4.25

∆R : ± (1.0%+0.0005Ω)
Without distinct damage inappearance

Damp Heat with Load

60 ± 2℃ with relative humidity 90% to95%. D.C. rated voltage for 1.5 hours
ON and 30 minutes OFF. Cycle
repeated 1,000 hours
Refer to JIS C 5201-1 4.24

∆R : ± (1.0%+0.0005Ω)
Without distinct damage inappearance

Mechanical Shock

100 G’s for 6milliseconds. 5 pulses
Refer to JIS C 5201-1 4.21

∆R : ± (0.5%+0.0005Ω)
Without mechanical damage suchas break

Bending Test

Glass-Epoxy board thickness : 1.6mm
Bending width : 2mm
Between the fulcrums : 90mm
Refer to JIS C 5201-1 4.33

∆R : ±(0.5%+0.0005Ω)
Without mechanical damage suchas break

UNLESS OTHERWISE SPECIFIEDTOLERANCES ON ﹕X=±X.X=±
X.XX = ±ANGLES ± HOLE DIA. ±DRAWN

BY ﹕connie 4/3/13

DESIGNED BY ﹕CHECKEDBY ﹕APPROVED BY ﹕SCALE ﹕ X

UNIT ﹕ X

Engineering Spec. For 3/4W 2010
TITLE : The
Low Resistance Chip Resistor

台達電子工業股份有限公司
Delta Electronics, Inc.
THIS DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF Delta Electronics, Inc.
AND SHALL NOT BE REPRODUCED OR USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSIONDOCUMENTNO.

SR550000N
PAGE 5OF 8PAGEREV.

A27. Recommend Land Pattern

VOLTAGE SENSE LINE0.50mmLAND PATTERNSOLDER RESIST AREAD

CURRENT LINE

B'B

ACA

B

B’C

D3.1

2.75

1.4

7.0

3.05
Unit : mm

UNLESS OTHERWISE SPECIFIEDTOLERANCES ON ﹕X=±X.X=±X.XX = ±ANGLES ± HOLE DIA. ±DRAWN

BY ﹕connie 4/3/13

DESIGNED BY ﹕CHECKED

BY ﹕APPROVED BY ﹕SCALE ﹕ X

UNIT ﹕ XEngineering Spec. For 3/4W 2010
TITLE : The
Low Resistance Chip Resistor

台達電子工業股份有限公司
Delta Electronics, Inc.
THIS DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF Delta Electronics, Inc.
AND SHALL NOT BE REPRODUCED OR USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSIONDOCUMENTNO.

SR550000N
PAGE 6OF 8

PAGEREV.

A2

8. Packaging
8-1 Dimensions
8-1-1 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

4.0 ± 0.10

1.05±0.10

2.80 ± 0.10

1.50±0.1

Pulling direction
Unit : mm8-1-2 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 : mmUNLESS OTHERWISE SPECIFIEDTOLERANCES ON ﹕X=±X.X=±X.XX = ±ANGLES ± HOLE DIA. ±DRAWN

BY ﹕connie 4/3/13

DESIGNED BY ﹕CHECKEDBY ﹕APPROVED BY ﹕SCALE ﹕ X

UNIT ﹕ X

Engineering Spec. For 3/4W 2010
TITLE : The
Low Resistance Chip Resistor

台達電子工業股份有限公司
Delta Electronics, Inc.
THIS DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF Delta Electronics, Inc.
AND SHALL NOT BE REPRODUCED OR USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSIONDOCUMENTNO.

SR550000N
PAGE 7OF 8

PAGEREV.

A2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
Top Cover Tape

165 ~ 180°

0.1 ~ 0.7N

Carrier tape

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

UNLESS OTHERWISE SPECIFIEDTOLERANCES ON ﹕X=±
X.X=±
X.XX = ±ANGLES ± HOLE DIA. ±DRAWN

BY ﹕connie 4/3/13

DESIGNED BY ﹕CHECKEDBY ﹕APPROVED BY ﹕SCALE ﹕ X

UNIT ﹕ X

Engineering Spec. For 3/4W 2010
TITLE : The
Low Resistance Chip Resistor

台達電子工業股份有限公司
Delta Electronics, Inc.
THIS DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF Delta Electronics, Inc.
AND SHALL NOT BE REPRODUCED OR USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSIONDOCUMENTNO.

SR550000N
PAGE 8OF 8PAGEREV.

A2