WK08M221_YTL [WALSIN]

Reduced size of final equipment;


型号：	WK08M221_YTL
厂家：	Walsin Technology
描述：	Reduced size of final equipment
文件：	总10页 (文件大小：608K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

WK12M / WK08M / WK06M

0/-20%, 0/-30%

Trimmable chip resistors

Size 1206, 0805, 0603,

Customer

Approval No :

Issue Date :

Customer Approval :

Page 1 of 10

WKxxM Trimmable

Ver.2

July 2017

FEATURE

1. Reduced size of final equipment

2. Lower assembly costs

3. Higher component and equipment reliability

4. Improved performance at high frequency

5. Low noise, when not trimmed

6. RoHS compliant and Lead free termination

APPLICATION



Consumer electrical equipment

Automotive application

EDP, Computer application

Telecom application

DESCRIPTION

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

added at each and connected by a resistive paste, which is applied to the substrate. The composition of the

paste is adjusted to give the approximate resistance required.

The resistive layer is covered with a transparent protective coating. Finally the two external end terminations are

added. For case of soldering the outer of theses end terminations is a Tin (lead free) alloy.

Fig 1. Construction of Trimmable Chip-R

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WKxxM Trimmable

Ver.2

July 2017

QUICK REFERENCE DATA

Item

General Specification

WK08M

Series No.

WK12M

WK06M

Size code

1206 (3216)

0805 (2012)

1 ~ 4.7M

0603 (1608)

Resistance Range

Tolerance

1 ~ 4.7M

10 ~ 4.7M

0/-20% and 0/-30% (E24 series)

TCR (ppm/C)

10

  200 ppm/C

-200~+500 ppm/C

1/8 W

  200 ppm/C

-200~+500 ppm/C

1/10W

  200 ppm/C

<10

Max. dissipation at T_amb=70C

Max. Operation Voltage (DC or RMS)

Climatic category (IEC 60068)

1/16W

50V

200V

150V

55/125/56

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 Valueor Max. RCWV listed above, whichever is lower.

Dimensions

WK12M

3.20  0.15

1.60  0.15

0.55  0.10

1.30  0.10

0.50  0.25

WK08M

WK06M

2.00  0.10

1.25  0.10

0.55  0.10

0.66  0.10

0.40  0.20

1.60  0.10

0.80  0.10

0.45  0.10

0.30  0.10

MARKING

No marking for Trimmable Chip Resistor

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WKxxM Trimmable

Ver.2

July 2017

TRIMMING INTRODUCTIONS

Typical value for a YAG-laser;

cutting speed

laser power

bite size

: 10-200 mm/sec,

: 1-6 Watt,

: 3~10m ( = speed / Q_rate , Bite Size is the distance each laser spot moving and

influence the trimming accuracy)

maximum trimming length : 60% of resistive film width, minimum distance from end termination to trimming

cut : 0.20mm, minimum distance between cuts (double-cut) : 0.5mm

Protection of the laser cut

by epoxy-fenol lacquers, epoxy resins or silicon alkyd-resins.

This is necessary for humidity test and stability under loaded.

FUNCTIONAL DESCRIPTION

Product characterization

Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of 0/-20%,

and 0/-30%. The values of the E24 series are in accordance with “IEC publication 60063”

Derating

The power that the resistor can dissipate depends on the operating temperature; see Fig.2

Figure 2 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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WKxxM Trimmable

Ver.2

July 2017

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 3.

Fig 3. 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

Packaging code

Termination code

WK12 : 1206 M : Trimmable

WK08 : 0805

E24 :

significant digits X : 0/-30%

: 7” Reeled taping

= Sn base (lead

free)

followed by no. of

zeros and a blank

Y : 0/-20%

: Bulk

WK06 : 0603

4.7

10

=4R7_

=100_

=221_

220

(“_” means a blank)

Reeled tape packaging : WK12M / WK08M / WK06M - 8mm width paper taping 5000pcs per reel.

Bulk packaging : WK12M / WK08M / WK06M - 5000pcs per poly bag

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WKxxM Trimmable

Ver.2

July 2017

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

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WKxxM Trimmable

Ver.2

July 2017

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WKxxM Trimmable

Ver.2

July 2017

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WKxxM Trimmable

Ver.2

July 2017

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WKxxM Trimmable

Ver.2

July 2017

PACKAGING

Paper Tape specifications (unit :mm)

Series No.

WK12M

WK08M

WK06M

3.60±0.20

2.50±0.20

1.90±0.20

2.00±0.15

1.65±0.15

1.15±0.15

8.00±0.20

3.50±0.05

1.75±0.10

Series No.

WK12M / WK08M

WK06M

D

Max. 1.0

Max. 0.8

4.0±0.10

1.50+0.10

Reel dimensions

Symbol (unit : mm)

WK12M / WK08M / WK06M

13.0±0.2

9.0+1.0

180-1.5

60.0+1.0

Page 10 of 10

WKxxM Trimmable

Ver.2

July 2017

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