VE-470M1CTT-0605VTSA - LELON ELECTRONICS

Approval Sheet

Page 1 of 10 ASC_WFxxR_Q_V03 SEP - 2017

WF25R_Q,WF20R_Q,WF10R_Q

WF12R_Q,WF08R_Q, WF06R_Q

WF04R_Q.

1%, 0.5%, 0.25%, 0.1%, 0.05%,

0.02%

TC25

High Precision Power Thin Film chip

resistors

(RoHS compliant 、Halogen Free)

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

0402,

AEC Q200 Compliant

*Contents in this sheet are subject to change without prior notice.

Approval Sheet

Page 2 of 10 ASC_WFxxR_Q_V03 SEP - 2017

FEATURE

1. SMD metal film resistor

2. High reliability and stability of 0.5% and below per customer request

3. High performance of TCR: 25 ppm/C and below per customer request

4. Low current noise

5. RoHS compliant and lead free

6. AEC-Q200 qualified

APPLICATION

 Automotive

 Medical equipment

 Measuring instrument

 Communication device

 Electronic deveices

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 WFxxR_Q

Approval Sheet

Page 3 of 10 ASC_WFxxR_Q_V03 SEP - 2017

QUICK REFERENCE DATA

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)

Type

WF25R_Q

WF20R_Q

WF10R_Q

WF12R_Q

WF08R_Q

WF06R_Q

WF04R_Q

L

6.35  0.10

5.00  0.10

3.10  0.10

3.05  0.15

2.00  0.10

1.55  0.10

1.00  0.10

W

3.20  0.15

2.50  0.15

2.60  0.15

1.55  0.15

1.25  0.10

0.80  0.10

0.50  0.05

A

0.60  0.20

0.50  0.20

0.40  0.20

0.25  0.20

0.25  0.15

0.15  0.10

B

0.90  0.25

0.60  0.25

0.50  0.20

0.40  0.20

0.30  0.15

0.25  0.10

t

0.55  0.10

0.55  0.15

0.50  0.15

0.45  0.15

0.30  0.05

Item

General Specification

Series No.

WF25R

WF20R

WF10R

WF12R

WF08R

WF06R

WF04R

Size Code

2512

(6432)

2010

(5025)

1210

(3225)

1206

(3216)

0805

(2012)

0603

(1608)

0402

(1005)

Resistance Tolerance

1.0%, 0.5%, 0.25%, 0.1%, 0.05%, 0.02%

Resistance Range

10 ~

1.5M

10 ~

1.5M

10 ~

1M

4.7 ~

1M

4.7 ~

1M

4.7 ~

680K

10 ~

100K

TCR

25 ppm/C

Max. Dissipation at

Tamb=70C

1W

3/4W

2/5W

1/4W

1/8W

1/10W

Max. Operation Voltage

200V

150V

75V

50V

Max. Overload Voltage

400V

300V

150V

100V

Operation Temperature

- 55~ +155’C

Protective coat

Resistive layer

End termination

Ceramic Substrate

t

B

A

T

W

L

1001

Approval Sheet

Page 4 of 10 ASC_WFxxR_Q_V03 SEP - 2017

MARKING

 3-digits marking for 0603 size

WFxxR has same marking rule as WRxx ±1%.

Nominal resistance

Description

1.E-24 series

As 0603 WR06X 5%.

2.E-96 series

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

01

100

13

133

25

178

37

237

49

316

61

422

73

562

85

750

02

102

14

137

26

182

38

243

50

324

62

432

74

576

86

768

03

105

15

140

27

187

39

249

51

332

63

442

75

590

87

787

04

107

16

143

28

191

40

255

52

340

64

453

76

604

88

806

05

110

17

147

29

196

41

261

53

348

65

464

77

619

89

825

06

113

18

150

30

200

42

267

54

357

66

475

78

634

90

845

07

115

19

154

31

205

43

274

55

365

67

487

79

649

91

866

08

118

20

158

32

210

44

280

56

374

68

499

80

665

92

887

09

121

21

162

33

215

45

287

57

383

69

511

81

681

93

909

10

124

22

165

34

221

46

294

58

392

70

523

82

698

94

931

11

127

23

169

35

226

47

301

59

402

71

536

83

715

95

953

12

130

24

174

36

232

48

309

60

412

72

549

84

732

96

976

 4-digits marking for 2512, 2010, 1210, 1206, 0805 size

For E24+E96, each resistor is marked with a four digits code on the protective coating to designate the

nominal resistance value. 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

100

6800

47000

4-digits marking

1000

6801

4702

 No marking code for 0402 and 0201 size

FUNCTIONAL DESCRIPTION

Product characterization

Standard values of nominal resistance are taken from the E192 & E24 series for resistors with a tolerance of

1.0%, 0.5%, 0.25%, 0.1%, 0.05%. The values of the E24/E192 series are in accordance with “IEC

publication 60063”.

Approval Sheet

Page 5 of 10 ASC_WFxxR_Q_V03 SEP - 2017

DERATING:

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

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.

Approval Sheet

Page 6 of 10 ASC_WFxxR_Q_V03 SEP - 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 within lead-free solder bath. The

test condition for no leaching is 260C for 30 seconds. Typical examples of soldering profile and condition that

provide reliable joints without any damage are given in Fig 3. and Table 1.

Fig. 3 Infrared soldering profile for Chip Resistors

Table 1. Infrared soldering condition for Chip Resistors

Temperature Condition

Exposure Time

Average ramp-up rate (217C to 260C)

Less than 3C/second

Between 150 and 200C

Between 60-120 seconds

> 217C

Between 60-150 seconds

Peak Temperature

260ºC +0/-5C

Time within 245C

Min. 30 seconds

Ramp-down rate (Peak to 217C)

Less than 6C/second

Time from 25C to Peak

No greater than 480 seconds

Approval Sheet

Page 7 of 10 ASC_WFxxR_Q_V03 SEP - 2017

CATALOGUE NUMBERS

The resistors have a catalogue number starting with .

WF06

R

xxxx

B

T

L

Q

Size code

WF25: 2512

WF20: 2010

WF10: 1210

WF12: 1206

WF08: 0805

WF06: 0603

WF04: 0402

Type code

R: TCR = 25 ppm

& High power

Resistance code

R is first code followed by

3 significant digits.

100 =1000

37.4K =3742

Tolerance

U : 0.02%

A : 0.05%

B : 0.10%

C : 0.25%

D : 0.50%

F : 1.00%

Packaging code

T : Reeled

A : 7” Reel 15k pcs

Termination code

L = lead free

Special code

AEC-Q200

Qualified

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

5,000pcs/reel for WF10R_Q, WF12R_Q, WF08R_Q, WF06R_Q,

10,000pcs/reel for WF04R_Q;

2. Reeled tape packaging: 12mm width paper taping

4,000pcs/reel for WF25R_Q, WF20R_Q.

Approval Sheet

Page 8 of 10 ASC_WFxxR_Q_V03 SEP - 2017

TEST AND REQUIREMENTS

TEST

PROCEDURE

REQUIREMENT

Resistor

Electrical

Characteristics

IEC 60115-1 4.8

- DC resistance values measurement

- Temperature Coefficient of Resistance (T.C.R)

Natural resistance change per change in degree centigrade.

 

6

121

12 10



ttR

RR

(ppm/C) t1 : 20°C+5°C-1°C

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

R2 : Resistance at test temperature (-55°C or +125°C)

Within the specified tolerance

Short time overload

(S.T.O.L)

IEC60115-1 4.13

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. ±(0.25%+0.05)

Resistance to soldering

heat(R.S.H)

AEC Q200-15

Un-mounted chips completely immersed for 10±1second in a

SAC solder bath at 260℃±5ºC

no visible damage

 R/R max. ±(0.25%+0.05)

Solderability

IEC 60068-2-58

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

Thermal Shock

MIL-STD-202 Method

107

Test –55 to 125℃/ dwell time 15min/ Max transfer time 20sec

1000 cycles

no visible damage

R/R max. ±(0.1%+0.05)

Bias Humidity

AEC Q200-7

1000 +48/-0 hours, loaded with 10% rated power in humidity

chamber controller at +85℃/ 85%RH

R/R max. (0.5%+0.05)

Endurance

IEC60115-1 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

R/R max. (0.5%+0.05)

Operational Life

AEC Q200-8

MIL-STD-202 -108

1,000 hours at 125±2°C, loaded with rated power continuously

R/R max. (0.5%+0.05)

High Temperature

Exposure

AEC Q200-3

1000 hrs @ 125℃, un-powered

1000 hrs @ 155℃, un-powered

R/R max. (0.1%+0.05)

R/R max. (0.3%+0.05)

Moisture Resistance

AEC-Q200 -6

MIL-STD-202 Method

106

652C, 80~100% RH, 10 cycles, 24 hours/ cycle

R/R max. (0.1%+0.05)

Mechanical Shock

MIL-STD-202 Method

213

1/2 Sine Pulse / 1500g Peak / Velocity 15.4ft/sec

R/R max. (0.25%+0.05)

Vibration

MIL-STD-202 Method

204

5 g's for 20 min , 12 cycles each of 3 orientations

R/R max. (0.1%+0.05)

Terminal strength

AEC-Q200-6

1 kg for 60 s

No broken

Board flex

AEC-Q200-21

Bending 2mm for 60 sec

R/R max. (0.1%+0.05)

Approval Sheet

Page 9 of 10 ASC_WFxxR_Q_V03 SEP - 2017

PACKAGING

Paper Tape specifications (unit :mm)

Series No.

Tape

A

B

W

D

E

WF25

Plastic

6.90±0.20

3.60±0.20

12.00±0.30

5.50±0.10

1.75±0.10

WF20

Plastic

5.50±0.20

2.80±0.20

12.00±0.30

5.50±0.10

1.75±0.10

WF12

Paper

3.60±0.20

2.00±0.20

8.00±0.30

3.50±0.20

1.75±0.10

WF10

Paper

3.60±0.20

3.00±0.20

8.00±0.30

3.50±0.20

1.75±0.10

WF08

Paper

2.40±0.20

1.65±0.20

8.00±0.30

3.50±0.20

1.75±0.10

WF06

Paper

1.90±0.20

1.10±0.20

8.00±0.30

3.50±0.20

1.75±0.10

WF04

Paper

1.20±0.10

0.7±0.10

8.00±0.20

3.50±0.05

1.75±0.10

Series No.

F

P0

D

T

WF25

4.00±0.10

1.0 0.0

50.1 





Max 1.2

WF20

4.00±0.10

1.0 0.0

50.1 





Max 1.2

WF12

4.00±0.10

1.0 0.0

50.1 





Max. 1.0

WF10

4.00±0.10

1.0 0.0

50.1 





Max. 1.0

WF08

4.00±0.10

1.0 0.0

50.1 





Max. 1.0

WF06

4.00±0.10

1.0 0.0

50.1 





0.65±0.05

WF04

2.00±0.10

4.00±0.10

1.0 0.0

50.1 





0.40±0.05

Approval Sheet

Page 10 of 10 ASC_WFxxR_Q_V03 SEP - 2017

Reel dimensions

A

B

C

D

WF25R_Q , WF20R_Q

WF12R_Q , WF10R_Q , WF08R_Q , WF06R_Q, WF04R_Q

Taping quantity

- Chip resistors 4,000 pcs per reel ( WF25R_Q, WF20R_Q )

- Chip resistors 5,000 pcs per reel ( WF10R_Q, WF12R_Q, WF08R_Q, WF06R_Q )

- Chip resistors 10,000 pcs per reel ( WF04R_Q )

Symbol

A

B

C

D

(unit : mm)

178.0±2.0

60.0±1.0

13.0±0.2

14.0±0.5

Symbol

A

B

C

D

(unit : mm)

178.0±2.0

60.0±1.0

13.0±0.2

9.0±0.5