WR25X1020JTR [WALSIN]

Thick Film Power Chip Resistors;


型号：	WR25X1020JTR
厂家：	Walsin Technology
描述：	Thick Film Power Chip Resistors
文件：	总7页 (文件大小：205K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Approval sheet

WR18X(W), WR20X(W), WR25X(W)

±1%, ±5%

Thick Film Power Chip Resistors

RoHS compliant lead content <100ppm

Size 1218,2010,2512

*Contents in this sheet are subject to change without prior notice.

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Approval sheet

FEATURE

1. High power rating and compact size

2. High reliability and stability

3. Reduced size of final equipment

4. RoHS exemption free & Lead free products

APPLICATION

•

Power supply

PDA

Digital meter

Computer

Automotives

Battery charger

DC-DC power converter

DESCRIPTION

The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal metal electrodes are

added at each end and connected by a resistive paste that is applied to the top surface of the substrate. The

composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to

nominated value within tolerance which controlled by laser trimming of this resistive layer.

The resistive layer is covered with a protective coat. For all sizes overcoat color is light blue. Finally, the two

external end terminations are added. For ease of soldering the outer layer of these end terminations is Tin (lead

free) alloy.

Fig 1. Construction of Chip-R

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Approval sheet

QUICK REFERENCE DATA

Item

Series No.

General Specification

WR20X(W)

WR18X(W)

1218(3248)

WR25X(W)

2512(6432)

Size code

2010 ( 5025 ),

Resistance Tolerance

Resistance Range

±5% (E24); ±1% (E24+E96)

1Ω ~ 10MΩ, Jumper (0Ω)

± 100 ppm/°C

TCR (ppm/°C) : 10Ω< Rn ≤ 10MΩ

1Ω≤ Rn ≤ 10Ω

± 100 ppm/°C

± 200 ppm/°C

± 100 ppm/°C

± 200 ppm/°C

0.5 W

200V

Max. dissipation at T_amb=70°C

Max. Operation Voltage (DC or RMS)

Max. Overload Voltage (DC or RMS)

Climatic category (IEC 60068)

200V

400V

250V

500V

400V

55/155/56

Test conditions for jumper ( 0 ohm )

Type

WR18X(W)

1 W

WR20X(W)

WR25X(W)

1 W

Power Rating At 70C

Resistance

1/2 W

Max. 50mR

3.2 A

Max. 50mR

4.5 A

Max. 50mR

4.5 A

Rated Current

Peak Current

11 A

8 A

11 A

Operating Temperature

-55C ~ 155C

Note :

This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication

60115-8”

Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by

RCWV = RatedPower ×Resistance Value or Max. RCWV listed above, whichever is lower.

MECHANICAL DATA (unit : mm)

TYPE

WR18X(W)

3.05±0.15

4.60±0.20

0.55±0.10

0.45±0.25

0.50±0.25

WR20X(W)

5.00±0.20

2.50±0.20

0.55±0.10

0.65±0.25

0.60±0.25

WR25X(W)

6.40±0.20

3.20±0.20

0.60±0.10

0.65±0.25

0.90±0.25

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Approval sheet

MARKING

No marking for all sizes!

FUNCTIONAL DESCRIPTION

Product characterization

Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of

±5% & ±1%. The values of the E24/E96 series are in accordance with “IEC publication 60063”.

Derating curve

The power that the resistor can dissipate depends on the operating temperature; see Fig.3

Figure 3. Maximum dissipation in percentage of rated power

as a function of the ambient temperature.

MOUNTING

Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by

automatic placement systems.

Chip placement can be on ceramic substrates and printed-circuit boards (PCBs).

Electrical connection to the circuit is by individual soldering condition.

The end terminations guarantee a reliable contact.

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SOLDERING CONDITION

The robust construction of chip resistors allows

them to be completely immersed in a solder

bath of 260°C for 10 seconds. Therefore, it is

possible to mount Surface Mount Resistors on

one side of

a PCB and other discrete

components on the reverse (mixed PCBs).

Surface Mount Resistors are tested for

solderability at 235°C during 2 seconds. The

test condition for no leaching is 260°C for 30

seconds. Typical examples of soldering

processes that provide reliable joints without

any damage are given in Fig 4.

Fig 4. Infrared soldering profile for Chip Resistors

CATALOGUE NUMBERS

The resistors have a catalogue number starting with .

WR20

472_

Resistance code

Size code

Type code

X :

Tolerance

J : ±5%

Packaging code

T : 7” Reel taping

(T:1218 10” Reel)

RoHS code

WR25 : 2512

WR20 : 2010

WR18: 1218

5% E24 : 2 significant digits

followed by no. of zeros and

a blank

R = Lead content

< 100ppm

±5%: 1Ω-10MΩ

±1%: 10Ω-1MΩ

W :

F : ±1%

P : Jumper

4.7Ω

10Ω

=4R7_

=100_

1% : <10Ω or

>1MΩ

1% E24+E96: 3 significant digits

followed by no. of zeros

102Ω

=1020

=3742

37.4KΩ

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TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)

Essentially all tests are carried out according to the schedule of IEC publication 115-8, category LCT/UCT/56 (rated

temperature range : Lower Category Temperature, Upper Category Temperature; damp heat, long term, 56 days). The

testing also meets the requirements specified by EIA, EIAJ and JIS.

The tests are carried out in accordance with IEC publication 68, "Recommended basic climatic and mechanical robustness

testing procedure for electronic components" and under standard atmospheric conditions according to IEC 60068-1,

subclause 5.3. Unless otherwise specified, the following value supplied :

Temperature: 15°C to 35°C.

Relative humidity: 45% to 75%.

Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar).

All soldering tests are performed with midly activated flux.

REQUIREMENT

TEST

PROCEDURE

DC resistance

DC resistance values measured at the test voltages specified below : Within the specified

tolerance

Clause 4.5

<10Ω@0.1V,<100Ω@0.3V, <1KΩ@1.0V, <10KΩ@3V,

<100KΩ@10V, <1MΩ@25V, <10MΩ@30V

Temperature

Natural resistance change per change in degree centigrade.

Refer to

Coefficient of

Resistance(T.C.R)

“QUICK REFERENCE

DATA”

R₂− R

×10⁶(ppm/°C) t₁: 20°C+5°C-1°C

(

t₂− t₁

)

Clause 4.8

R₁: Resistance at reference temperature

R₂: Resistance at test temperature

∆R/R max. ±(2%+0.1Ω)

Short time overload

(S.T.O.L) Clause

Clause 4.13

Permanent resistance change after a 5second application of a voltage

2.5 times RCWV or the maximum overload voltage specified in the

above list, whichever is less.

Resistance to

soldering heat(R.S.H)

Clause 4.18

Un-mounted chips completely immersed for 10±1second in a SAC

solder bath at 260℃±5ºC

no visible damage

∆ R/R max. ±(1%+0.05Ω)

Un-mounted chips completely immersed for 2±0.5 second in a SAC good tinning (>95%

Solderability

solder bath at 235℃±5℃

covered)

Clause 4.17

no visible damage

Temperature cycling

30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes no visible damage

at +155°C±3°C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous

∆R/R max. ±(1%+0.05Ω)

Clause 4.19

cycles

1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller

70±2ºC, 1.5 hours on and 0.5 hours off

∆R/R max. ±(3%+0.1Ω)

Load life (endurance)

Clause 4.25

1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber

controller at 40°C±2°C and 90~95% relative humidity, 1.5hours on and

0.5 hours off

∆R/R max. ±(3%+0.1Ω)

∆R/R max. ±(1%+0.05Ω)

Load life in Humidity

Clause 4.24

Bending strength

Clause 4.33

Adhesion

Resistors mounted on a 90mm glass epoxy resin PCB(FR4);

bending : 2 mm, once for 10 seconds

Pressurizing force: 5N, Test time: 10±1sec.

No remarkable damage or

removal of the terminations

Clause 4.32

Insulation Resistance

R≧10GΩ

Apply the maximum overload voltage (DC) for 1minute

Apply the maximum overload voltage (AC) for 1 minute

Clause 4.6

Dielectric Withstand

No breakdown or flashover

Voltage

Clause 4.7

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PACKAGING

Plastic Tape specifications (unit :mm)

Type

WR18

WR20

WR25

4.90±0.20

5.50±0.20

6.90±0.20

3.55±0.30

2.80±0.20

3.60±0.20

12.00±0.30

5.50±0.10

1.75±0.10

Type

WR18

WR20

WR25

ΦD

8.00±0.10

1.30±0.20

+0.1

4.00±0.10

Φ1.50

−0.0

4.00±0.10

MAX1.2

Reel dimensions

Symbol

(unit : mm)

13.0±0.2

14.0±0.2

Φ178.0±2.0

Φ60.0±1.0

Taping quantity

WR20, WR25 by plastic tape taping 4,000 pcs per reel.

WR18 by plastic tape taping 3,000 pcs per reel

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