WK25L472_JTLV [WALSIN]

High power rating and compact size;


型号：	WK25L472_JTLV
厂家：	Walsin Technology
描述：	High power rating and compact size
文件：	总8页 (文件大小：478K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Approval sheet

WK12L, WK20L, WK25L

1%, 5%

Thick Film Power Chip Resistor

Wide Termination

RoHS compliant and Halogen free

Size 0612, 1020, 1225

Automotive AEC Q200 Compliant

ASTM B-809-95 Compliant

*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 compliant and Halogen free products

5. AEC Q200 Compliant

6. ASTM B-809-95 60’C 1000hrs compliant

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. Finally, the two external end terminations are added at

longer sides. For ease of soldering the outer layer of these end terminations is Tin (lead free) alloy.

Fig 2. Construction of Chip-R

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QUICK REFERENCE DATA

Item

Series No.

General Specification

WK20L

WK12L

WK25L

Size code

0612(1632)

1020 ( 2550 ),

1225(3264)

Resistance Tolerance

Resistance Range

5% (E24); 1% (E24+E96)

1 ~ 1M,

TCR (ppm/C) :

 200 ppm/C

3/4W

200V

400V

1 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

55/155/56

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

WK12L

WK20L

WK25L

3.200.20

1.600.20

0.550.10

0.500.25

5.000.20

2.500.15

0.550.10

0.600.20

6.300.20

3.200.20

0.550.10

0.600.20

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MARKING

Each resistor is marked with a four-digit code on the protective coating to designate the nominal resistance

value.

Example:

1R00 = 1

3901 = 3900

1101 = 1100

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 .

WK12

472_

Size code

Type code

Resistance code

Tolerance

J : 5%

Packaging code Termination

Special code

code

WK25 : 1225

WK20 : 1020

WK12: 0612

L : wide

termination

T : 7” Reel

5% E24 : 2 significant

digits followed by no.

of zeros and a blank

V = AEC Q200

Compliant +

taping

= Sn base

F : 1%

ASTM B-809-

95 Compliant

(lead free)

P : Jumper

4.7

10

=4R7_

=100_

1% E24+E96: 3 significant

digits followed by no.

of zeros

102

=1020

=3742

37.4K

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TEST AND REQUIREMENTS ( AEC Q200 )

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PACKAGING

Tape specifications (unit :mm)

Type

WK12L

WK20L

WK25L

3.60±0.20

5.50±0.20

6.90±0.20

2.00±0.15

3.10±0.20

3.60±0.20

8.00±0.30

12.00±0.30

3.50±0.10

5.50±0.10

1.75±0.10

Type

D

WK12L

WK20L

WK25L

Max 1.0

0.1

0.0

4.00±0.10

1.50

1.10±0.15

Reel dimensions

(unit : mm)

Symbol

7” Reel

10” Reel

13” Reel

13.0±0.2

12.4.0±1.00

14.0±0.20

178.0±2.0

254.0±2.0

330.0±2.0

60.0±1.0

100.0±1.0

Taping quantity

WK20L, WK25L by plastic tape taping 4,000 pcs per 7” reel!

WK12L by paper tape taping 5,000 pcs per 7” reel!

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