WK25SR820MTL [WALSIN]

High power rating and compact size;


型号：	WK25SR820MTL
厂家：	Walsin Technology
描述：	High power rating and compact size
文件：	总7页 (文件大小：263K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Approval sheet

WK25S WK20S WK10S WK12S WK08S

WK06S

±5%, ±10%, ±20%

Thick Film Power Surge Chip Resistors

Size 2512 , 2010 , 1210, 1206 , 0805, 0603

*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. High anti-surge protection

5. Halogen free

APPLICATION

•

Power supply

Measurement instrument

Automotive industry

Medical or Military equipment

DESCRIPTION

The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal 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 request resistance to nominal value within tolerance which controlled by printing

process in this resistive layer.

The resistive layer is covered with a protective coat. Finally, the two external end terminations are added. For

ease of soldering the outer layer of these end terminations is a Tin (Pb free) alloy.

Fig 1. Construction of Chip-R WKxxS

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Approval sheet

QUICK REFERENCE DATA

Item

General Specification

Series No.

Size code

WK25S

WK20S

WK10S

1210 (3225)

WK12S

WK08S

0805 (2012)

WK06S

2512(6432 )

2010 (5025)

1206

( 3216 )

0603 (1608)

Resistance Tolerance

Resistance Range

±5% ±10% ±20% (E24)

0.27Ω ~ 22MΩ

1Ω ~ 1MΩ

TCR (ppm/°C)

1.1MΩ ~ 22MΩ

1Ω ~ 1MΩ

10 - 1MΩ: ± 100 ppm /°C

1 - 9.1Ω: ± 200 ppm /°C

± 200 ppm /°C

± 100 ppm /°C

± 200 ppm /°C

1/2W

0.27Ω ~ 0.91Ω

Max. dissipation at

1 W

3/4W

1/3W

1/4W

T_amb=70°C

Max. Operation Voltage

Max. Overload Voltage

Operation temperature

200V

400V

200V

400V

200V

400V

200V

400V

150V

300V

150V

300V

- 55 ~ +155’C

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

or Max. RCWV listed above, whichever is lower.

RCWV = RatedPower ×ResistanceValue

MECHANICAL DATA(unit : mm)

1 0 1

Symbol

WK25S

WK20S

WK10S

WK12S

WK08S

WK06S

1.60 ± 0.10

6.30±0.15

3.20±0.15

0.55±0.15

0.30±0.15

0.60±0.20

5.00±0.15

2.50±0.15

0.55±0.15

0.30±0.15

0.60±0.20

3.10±0.15

2.50±0.15

0.55±0.15

0.30±0.20

0.50±0.25

3.10±0.15

1.60±0.15

0.55±0.10

0.30±0.20

0.50±0.25

2.00 ± 0.10

1.25 ± 0.10

0.55 ± 0.10

0.30 ± 0.20

0.40 ± 0.20

0.80 +0.15/-0.05

0.45 ± 0.10

0.30 ± 0.20

0.30 ± 0.10

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Approval sheet

MARKING

1. Each resistor is marked with a three-digit code on the protective coating to designate the nominal

resistance value.

Single pulse limiting power chart

WKxxS Surge resistor single pulse chart

10000

1000

100

WK25S

WK20S

WK10S

WK12S

WK08S

WK06S

100

1000

Duration time (msec)

De-rating curve

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

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Approval sheet

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.

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 .

WK25

Type code

S : surge

472_

Resistance code

Size code

Tolerance

J: ±5%

Packaging code

T : 7” Reeled taping

Termination code

WK25 : 2512

WK20 : 2010

WK10 : 1210

WK12 : 1206

WK08 : 0805

WK06 : 0603

E24 : 3 significant digits followed

by no. of zeros and a blank

= Sn base (lead

free)

K: ±10%

M: ±20%

472 = 4K7ohm

R820 = 0.82ohm

Taping quantity

- 1210, 1206, 0805, 0603 Chip resistors 5,000 pcs paper tape per reel.

- 2010, 2512 Chip resistors 4,000 pcs plastic tape per reel.

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Approval sheet

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

TEST

PROCEDURE

REQUIREMENT

Natural resistance change per change in degree centigrade. Refer to “QUICK REFERENCE

Temperature

Coefficient of

Resistance(T.C.R)

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

Permanent resistance change after a 2 second application of

a voltage 2.5 times RCWV or the maximum overload voltage

specified in the above list, whichever is less.

Short time overload

(S.T.O.L)

∆R/R max. ±(1%+0.05Ω)

no visible damage

Clause 4.13

Un-mounted chips completely immersed for 10±1second in a no visible damage

solder bath at 260℃±5ºC

Resistance to

soldering heat(R.S.H)

Clause 4.18

∆ R/R max. ±(1%+0.05Ω)

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

Solderability

a solder bath at 235℃±5℃

no visible damage

Clause 4.17

30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C, 30

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

5 cycles

no visible damage

Temperature cycling

Clause 4.19

∆R/R max. ±(1%+0.05Ω)

Load life (endurance)

70±2ºC, 1000 hours, loaded with RCWV or Vmax,1.5 hours

on and 0.5 hours off

∆R/R max. ±(5%+0.1Ω)

no visible damage

Clause 4.25

Load life in Humidity

1000 hours, at rated continuous working voltage 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. ±(5%+0.1Ω)

no visible damage

Clause 4.24

Endurance at high

temperature

155ºC, no load, 1000hours

∆R/R max. ±(5%+0.1Ω)

no visible damage

Clause 4.25.3

Bending strength

Clause 4.33

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

2512, 2010 bending : 1 mm, once for 10 seconds

∆R/R max. ±(1%+0.05Ω)

1210, 1206, 0805 bending : 3 mm, once for 10 seconds

Adhesion

No remarkable damage or

removal of the terminations

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

Clause 4.32

Insulation Resistance

R≧1GΩ

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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Approval sheet

PACKAGING

Tape specifications (unit :mm)

Series No.

WK25S

6.90±0.20

3.60±0.20

12.00±0.30

5.50±0.05

1.75±0.10

5.50±0.20

3.50±0.20

3.60±0.20

2.50±0.20

1.90±0.20

3.100±0.20

2.85±0.20

2.00±0.15

1.65±0.15

1.15±0.15

WK20S

WK10S

WK12S

WK08S

WK06S

8.00±0.30

8.00±0.20

8.00±0.30

3.50±0.05

1.75±0.10

Series No.

WK25S

WK20S

WK10S

ΦD

1.1±0.15

1.0±0.20

+0.1

4.00±0.10

Φ1.50

−0.0

WK12S

Max. 1.0

WK08S

WK06S

Max. 1.0

Max. 0.8

Reel dimensions

Reel / Tape

7” reel for 8mm tape

7” reel for 12mm tape

9+1.0/0

13.0±0.2

Φ180.0+0/-1.5

Φ60.0+1/0

13+1.0/0

Taping quantity

- 1210, 1206 0805, 0603 Chip resistors 5,000 pcs paper tape per reel.

- 2010, 2512 Chip resistors 4,000 pcs plastic tape per reel.

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OCT 2015

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