WF12G8205JTL - Walsin Technology Corp.

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WF12G, WF08G, WF06G, WF04G

±±

±1%, ±

±±

±5%,

11MΩ~100MΩ

High ohmic chip resistors

Size 1206, 0805, 0603, 0402

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FEATURE

1. Small size and light weight

2. High reliability and stability

3. Reduced size of final equipment

4. High precision

5. Higher component and equipment reliability

6. RoHS compliant and lead free products.

APPLICATION

• Power supply

• PDA

• Digital meter

• Computer

• Palmtop computers

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. Consctruction of Chip-R

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QUICK REFERENCE DATA

Item General Specification

Series No. WF12G WF08G WF06G WF04G

Size code 1206 ( 3216 ) 0805 ( 2125 ) 0603 ( 1608 ) 0402 ( 1005 )

Resistance Tolerance ±1%, ±5% ±5%

Resistance Range 10MΩ < R ≤ 100MΩ 10MΩ < R ≤ 30MΩ

( E24 series)

TCR (ppm/°C) ≤ ± 200 ppm/°C ≤ ± 300 ppm/°C

Max. dissipation at T

amb

=70°C 1/4 W 1/8 W 1/10 W 1/16W

Max. Operation Voltage (DC or RMS) 200V 150V 50V 50V

Climatic category (IEC 60068) 55/155/56

Note :

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

60115-8”

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

ValueResistancePower RatedRCWV ×=

or Max. RCWV listed above, whichever is lower.

DIMENSIONS(unit : mm)

series

WF12G WF08G WF06G WF04G

3.10 ± 0.15

2.00 ± 0.10

1.60 ± 0.10

1.00 ± 0.05

1.60 ± 0.15

1.25 ± 0.10

0.80 ± 0.10

0.50 ± 0.05

0.50 ±0.25

0.40 ± 0.20

0.30 ± 0.10

0.20 ± 0.10

0.50 ± 0.25

0.40 ± 0.20

0.30 ± 0.15

0.25 ± 0.10

0.55 ± 0.10

0.50 ± 0.15

0.45 ± 0.15

0.35 ± 0.05

MARKING

3-digits marking

Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance

value. For values up to 9.1 the R is used as a decimal point. For values of 10.0 or greater the first 2 digits

apply to the resistance value and third indicate the number of zeros to follow.

Example

306 = 30 MΩ

186 = 18 MΩ

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FUNCTIONAL DESCRIPTION

Product characterization

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

±5%. The values of the E24/E96 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.

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 :

WF06 G 226_ J T L

Size code

WF12 : 1206

WF08 : 0805

WF06 : 0603

WF04 : 0402

Type code

G : High ohmic >10MΩ

1206 size=0.25W

0805 size=0.125W

0603 size=0.10W

Resistance code

5% E24: 2 significant digits

followed by no. of zeros

and a blank

11MΩ =116_

22MΩ =226_

30MΩ =306_

(“_” means a blank)

1%, E24+E96: 3 significant

digits followed by no. of

zeros

100Ω =1000

37.4KΩ =3742

Tolerance

J : ±5%

F : ±1%

Packaging code

T : 7” Reeled taping

B : Bulk

Termination code

L = Sn base (lead

free)

1. Reeled tape packaging : 8mm width paper taping 5000pcs per 7” reel for 1206, 0805, 0603 ( 10,000pcs for 0402 )

2. Bulk packaging : 5000pcs per polybag

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

TEST PROCEDURE REQUIREMENT

Temperature

Coefficient of

Resistance (T.C.R)

Clause 4.8

Natural resistance change per change in degree centigrade.

( )

121

12 10×

−

ttR RR

(ppm/°C)

: Resistance at reference temperature

: Resistance at test temperature

: 20°C+5°C-1°C

: Test temperature.

Refer to quick reference data for

T.C.R specification.

Short time overload

(S.T.O.L)

Clause 4.13

Permanent resistance change after a 5 second application of a

voltage 2.5xU

or max. Overload voltage, whichever is less. No visible damage.

∆R/R max. J:≦ ±(2%+0.1Ω)

F:≦ ±(1%+0.05Ω)

Solderability

Clause 4.17

Un-mounted chips completely immersed for 2±0.5 second in a SAC

solder bath at 235℃±5℃. good tinning (>95% covered)

no visible damage

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. J:≦ ±(1%+0.1Ω)

F:≦ ±(0.5%+0.05Ω)

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TEST PROCEDURE REQUIREMENT

Temperature cycling

Clause 4.19

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.

No visible damage.

∆R/R max. J≦ ±(1%+0.1Ω)

F≦ ±(0.5%+0.05Ω)

Load life

(endurance)

Clause 4.25

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

controller 70±2ºC, 1.5 hours on and 0.5 hours off No visible damage.

∆R/R max. J≦ ±(3%+0.1Ω)

F≦ ±(1%+0.05Ω)

Load life in Humidity

Clause 4.24

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

No visible damage.

∆R/R max. J≦ ±(3%+0.1Ω)

F≦ ±(1%+0.05Ω)

Bending strength

Clause 4.33

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

bending : 3 mm, once for 10 seconds ∆R/R max. ±(1%+0.10Ω)

Adhesion

Clause 4.32

Pressurizing force: 5N, Test time: 10±1sec. No remarkable damage or

removal of the terminations.

Insulation Resistance

Clause 4.6

Apply the maximum overload voltage (DC) for 1minute R≧10GΩ

Dielectric Withstand

Voltage

Clause 4.7

Apply the maximum overload voltage (AC) for 1 minute No breakdown or flashover

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PACKAGING

Paper Tape specifications (unit :mm)

Series No. A B W F E

WF12G 3.60±0.20 2.00±0.20 8.00±0.30 3.50±0.2 1.75±0.10

WF08G 2.40±0.20 1.65±0.20 8.00±0.30 3.50±0.2 1.75±0.10

WF06G 1.90±0.20 1.10±0.20 8.00±0.30 3.50±0.2 1.75±0.10

Series No. P1 P0 ΦD T

WF12G 4.00±0.10 4.00±0.10

WF08G 4.00±0.10 4.00±0.10 Max. 1.0

WF06G 4.00±0.10 4.00±0.10

1.0 0.0

50.1

−

0.65±0.1

Reel dimensions

Symbol A B C D

(unit : mm) Φ178.0±2.0 Φ60.0±1.0 13.0±0.2 9.0±0.5

Taping quantity

- Chip resistors 5,000 pcs/reel for 1206, 0805, 0603 ( 10,000 pcs/reel for 0402 )