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WF12K57R6DTL

更新时间：2025-07-13 09:12:53

品牌：WALSIN

描述：1206(3216), 57.6Ω, ±0.5%, 1/4W

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WF12K57R6DTL 概述

1206(3216), 57.6Ω, ±0.5%, 1/4W

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WF12K, WF08K, WF06K, WF04K

1.0%, 0.5%, 0.25%, 0.1%

Thick film TC50

High Precision Thick Film chip resistors

Size 1206, 0805, 0603, 0402

Page 1 of 8

WFxxK_V02

Feb-2013

FEATURE

1. SMD Thick film resistor

2. High reliability and stability

3. High performance of TCR: 50 ppm/K

4. High precision

5. RoHS compliant & Lead free

APPLICATION



Medical equipment

Measuring instrument

Communication device

Computer

Printer

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 layer that is applied to the top surface of the substrate. The

composition of the resistive layer 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

environmental soldering issue, the outer layer of these end terminations is a Lead-free solder .

Fig 1. Construction of Chip-R WFxxK

Page 2 of 8

WFxxK_V02

Feb-2013

QUICK REFERENCE DATA

Item

Series No.

General Specification

WF12K

WF08K

WF06K

WF04K

Size code

1206 ( 3216 )

0805 ( 2012 )

0603 ( 1608 )

0402 ( 1005 )

Resistance Tolerance

Resistance Range

1.0%, 0.5%, 0.25%, 0.1%

10 ~ 1M

100 ~ 1M

( E24 +E96 )

TCR (ppm/C)

 50 ppm/C

1/4W

200V

400V

1/8W

150V

300V

1/10W

50V

1/16W

50V

Max. dissipation at T_amb=70C

Max. Operation Voltage (DC or RMS)

Max. Overload Voltage (DC or RMS)

100V

Operation temperature

Note :

- 55 ~ +155’C

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(unit : mm)

WF12K

WF08K

WF06K

WF04K

Type

3.10  0.10

1.60  0.10

0.50  0.20

0.45  0.20

0.60  0.15

2.00  0.10

1.25  0.10

0.40  0.20

0.50  0.15

1.60  0.10

0.80  0.10

0.30  0.10

0.30  0.15

0.45  0.10

1.00  0.05

0.50  0.05

0.20  0.10

0.25  0.10

0.35  0.05

Protective coat

End termination

Resistive layer

Ceramic Substrate

1001

Page 3 of 8

WFxxK_V02

Feb-2013

MARKING



3-digits marking for 0603 size

WFxxK has same marking rule as commodity ±1%.

3-digits marking（1% : 0603）

Nominal resistance

Description

1.E-24 series

2.E-96 series

As 0603 WR06X 5%.

The 1st two digit codes are referring to the CODE on the table, the 3rd code is the index of resistance

value :

Y=10^-2，X=10^-1，A=10⁰，B=10¹，C=10²，D=10³，E=10⁴，F=10⁵

EX :

17.8Ω=25X，178Ω=25A，1K78 =25B

17K8=25C， 178K=25D， 1M78=25E

3. Remark

There is no marking for the items are not under E-24 and E-96 series

CODE R_value CODE R_value CODE R_Value CODE R_value CODE R_value CODE R_value CODE R_value CODE R_value

100

102

105

107

110

113

115

118

121

124

127

130

133

137

140

143

147

150

154

158

162

165

169

174

178

182

187

191

196

200

205

210

215

221

226

232

237

243

249

255

261

267

274

280

287

294

301

309

316

324

332

340

348

357

365

374

383

392

402

412

422

432

442

453

464

475

487

499

511

523

536

549

562

576

590

604

619

634

649

665

681

698

715

732

750

768

787

806

825

845

866

887

909

931

953

976



4-digits marking for 1206, 0805 size

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

value of E24+E96. For values below 976 the R is used as a digit. For values of 100 or greater, the first 3

digits are significant, the fourth digit indicates the number of multiple to follow.

Example

RESISTANCE

10

12

100

6800

47000

10R0

12R0

1000

6801

4702

4-digits marking



No marking code for 0402 size

Page 4 of 8

WFxxK_V02

Feb-2013

FUNCTIONAL DESCRIPTION

Product characterization

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

1.0%, 0.5%, 0.25%, 0.1%. 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.

Page 5 of 8

WFxxK_V02

Feb-2013

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 within lead-free solder bath. 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.

CATALOGUE NUMBERS

The resistors have a catalogue number starting with .

WF08

Size code

xxxx

Tolerance

F : 1.0%

D : 0.5%

C: 0.25%

B : 0.1%

Type code

TCR 50ppm

Resistance code

E24+E192:

Packaging

code

Termination

code

WF12: 1206

WF08: 0805

WF06: 0603

WF04: 0402

T : 7” reel

G : 13” reel

L : lead free

R is first code followed by

3 significant digits.

E24: 39R0=>39R0

820R =>8200

E96: 49R9 =>49R9

499R =>4990

1. Reeled tape packaging: 8mm width paper taping.

for WF12, WF08, WF06, 5,000pcs/ 7” reel; 20kpcs/ 13” reel

for WF04, 10,000pcs/ 7” reel ; 70kpcs/ 13” reel

Page 6 of 8

WFxxK_V02

Feb-2013

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

REQUIREMENT

Resistor

TEST

PROCEDURE

DC resistance

DC resistance values measured

Within the specified tolerance

Clause 4.5

<10@0.1V, <100@0.3V, <1K@1.0V,

<10K@3V, <100K@10V,<1M@25V,

<10M@30V

Temperature

Natural resistance change per change in degree Refer to “QUICK REFERENCE DATA”

centigrade.

Coefficient of

Resistance(T.C.R)

R₂ R

₁t₂t₁

10⁶(ppm/C)

Clause 4.8

R₁: Resistance at reference temperature

R₂: Resistance at test temperature

t₁: 20°C+5°C-1°C

Short time overload

(S.T.O.L)

Permanent resistance change after a 5second

application of a voltage 2.5 times RCWV or the

maximum overload voltage specified in the above

list, whichever is less.

R/R max. ±(0.5%+0.05)

Clause 4.13

Resistance to soldering

heat(R.S.H)

Clause 4.18

Un-mounted chips completely immersed for no visible damage

10±1second in a SAC solder bath at 260℃±5ºC

 R/R max. ±(0.25%+0.05)

Solderability

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

second in a SAC solder bath at 235℃±5℃

Clause 4.17

no visible damage

Temperature cycling

no visible damage

30 minutes at -55C3C, 2~3 minutes at

Clause 4.19

20°C+5°C-1°C, 30 minutes at +125C3C,

2~3 minutes at 20°C+5°C-1°C, total

continuous cycles

R/R max. ±(0.5%+0.05)

Load life (endurance)

Clause 4.25

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

Vmax,1.5 hours on and 0.5 hours off

R/R max. (1.0%+0.05)

Load life in Humidity

Clause 4.24

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

Bending strength

Clause 4.33

Adhision

Resistors mounted on a 90mm glass epoxy resin

PCB(FR4); bending : 3 mm, once for 10 seconds.

R/R max. ±(0.5%+0.05)

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

No remarkable damage or removal of the

terminations.

Clause 4.32

Insulation Resistance

R≧10GΩ

Apply the maximum overload voltage (DC) for

1minute

Clause 4.6

Dielectric Withstand

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

minute

Voltage

Clause 4.7

Page 7 of 8

WFxxK_V02

Feb-2013

PACKAGING

Paper Tape specifications (unit :mm)

Series No.

WF12

3.60±0.20

2.40±0.20

1.90±0.20

1.20±0.10

2.00±0.20

1.65±0.20

1.10±0.20

0.7±0.10

8.00±0.30

8.00±0.20

3.50±0.20

3.50±0.05

1.75±0.10

WF08

WF06

WF04

Series No.

WF12

D

0.1

4.00±0.10

Max. 1.0

1.50

0.0

0.1

WF08

WF06

4.00±0.10

Max. 1.0

1.50

0.0

0.1

0.0

0.65±0.05

1.50

0.1

0.0

2.00±0.10

4.00±0.10

0.40±0.05

WF04

1.50

Reel dimensions

Symbol

7” reel

13.0±0.2

9.0±0.5

178.0±2.0

330.0±2.0

60.0±1.0

13” reel

100.0±1.0

Taping quantity

Chip resistors 5,000 pcs per 7” reel; 20,000 pcs per 13: reel ( WF12, WF08, WF06 )

Chip resistors 10,000 pcs per 7” reel; 70,000 pcs per 13” reel ( WF04 )

Page 8 of 8

WFxxK_V02

Feb-2013

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