WF25H1000BTL [WALSIN]

High power rating and compact size;


型号：	WF25H1000BTL
厂家：	Walsin Technology
描述：	High power rating and compact size
文件：	总7页 (文件大小：186K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Approval sheet

WF25H, WF20H

±0.1%, ±0.5%

Thick Film Power High Precision Resistors

Size 2512, 2010

*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 precision of resistance

APPLICATION

•

Power supply

PDA

Digital meter

Computer

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. 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

General Specification

Series No.

WF25H

2512 ( 6432 )

WF20H

Size code

2010 ( 5025 )

Resistance Tolerance

±0.5% ; ±0.1% (E24+E96)

Resistance Range

1Ω ~ 10MΩ,

± 200 ppm/°C

± 100 ppm/°C

TCR (ppm/°C) 1Ω ≤ Rn ≤ 10Ω

10Ω < Rn ≤ 10MΩ

1 W

0.5W

200V

400V

Max. dissipation at T_amb=70°C

Max. Operation Voltage (DC or RMS)

Max. Overload Voltage (DC or RMS)

Climatic category (IEC 60068)

250V

500V

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)

Symbol

2512

2010

6.40±0.20

3.20±0.20

0.60±0.10

0.65±0.25

0.90±0.25

5.00±0.20

2.50±0.20

0.55±0.10

0.65±0.25

0.60±0.25

MARKING

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

value.

Example:

1R00 = 1Ω

1001 = 1000Ω

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Approval sheet

FUNCTIONAL DESCRIPTION

Product characterization

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

±0.5% & ±0.1%. 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.2

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

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CATALOGUE NUMBERS

The resistors have a catalogue number starting with :

WF25

1000

Resistance code

Size code

Type code

Tolerance

B : ±0.1%

D : ±0.5%

Packaging code

T : 7” Reel taping

Termination code

WF25 : 2512

WF20 : 2010

H : Thick film, E24+E96

: 3 significant

digits followed by no. of zeros

= Sn base

High precision

(lead free)

102Ω

=1020

=3742

37.4KΩ

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.

TEST

PROCEDURE

REQUIREMENT

Within the specified tolerance

Refer to “QUICK REFERENCE

DATA”

Electrical

DC resistance values measurement

Characteristics

Temperature Coefficient of Resistance (T.C.R)

Natural resistance change per change in degree centigrade.

JISC5201-1: 1998

Clause 4.8

R₂− R

×10⁶(ppm/°C) t₁: 20°C+5°C-1°C

(

t₂− t₁

)

R₁: Resistance at reference temperature (20°C+5°C/-1 °C)

R₂: Resistance at test temperature (-55°C or +155°C)

Short time

Permanent resistance change after a 5second application of a

∆R/R max. ±(1%+0.05Ω)

overload ( STOL ) voltage 2.5 times RCWV or the maximum overload voltage

specified in the above list, whichever is less.

Clause 4.13

Resistance to

soldering heat

Un-mounted chips 10±1 seconds, in a SAC solder bath at no visible damage

260±5ºC

∆ R/R max. ±(1%+0.05Ω)

Clause 4.17

Solderability

Clause 4.18

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

SAC solder bath at 235±5ºC

no visible damage

Temperature

cycling

no visible damage

1. 30 minutes at -55°C±3°C,

2. 2~3 minutes at 20°C+5°C-1°C,

3. 30 minutes at +155°±3°C,

4. 2~3 minutes at 20°C+5°C-1°C,

Total 5 continuous cycles

∆R/R max. ±(1%+0.05Ω)

Clause 4.19

Load life

(endurance)

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)

Clause 4.25

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Load life in

Humidity

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)

Clause 4.24

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

bending once 2mm for 10sec,

Bending strength

JISC5201-1: 1998

Clause 4.33

Adhesion

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

No remarkable damage or

removal of the terminations

JISC5201-1: 1998

Clause 4.32

Insulation

Apply the maximum overload voltage (DC) for 1minutes

R≧10GΩ

Resistance

Clause 4.6

Dielectric Withstand

Voltage

Apply the maximum overload voltage (AC) for 1 minutes

No breakdown or flashover

Clause 4.7

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PACKAGING

Plastic tape specifications (unit :mm)

Type

2512

2010

6.90±0.20

5.50±0.20

3.60±0.20

2.80±0.20

12.00±0.30

5.50±0.1

1.75±0.10

Type

2512

ΦD

+0.1

4.00±0.10

Max. 1.2

Φ1.50

−0.0

+0.1

−0.0

4.00±0.10

2010

Max. 1.2

Φ1.50

Reel dimensions

Symbol

(unit : mm)

13.0±0.2

14.0±0.2

Φ178.0±2.0

Φ60.0±1.0

Taping quantity

- Chip resistors 4,000 pcs per reel.

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