WF08B2940DALQ datasheet, PDF - EEWORLD Datasheet

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WF08B2940DALQ: DescriptionFixed Resistor, Thin Film, 0.125W, 294ohm, 150V, 0.5% +/-Tol, 3ppm/Cel, Surface Mount, 0805, CHIP; CategoryPassive components The resistor; File Size671KB，10 Pages; ManufacturerWalsin Technology Corporation; Environmental Compliance

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WF08B2940DALQ Overview

Fixed Resistor, Thin Film, 0.125W, 294ohm, 150V, 0.5% +/-Tol, 3ppm/Cel, Surface Mount, 0805, CHIP

WF08B2940DALQ Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Objectid	145012923795
package instruction	CHIP
Reach Compliance Code	compliant
ECCN code	EAR99
Other features	ANTI-SULFUR, HIGH PRECISION, LASER TRIMMABLE
structure	Rectangular
Installation features	SURFACE MOUNT
Number of terminals	2
Maximum operating temperature	155 °C
Minimum operating temperature	-55 °C
Package height	0.5 mm
Package length	2 mm
Package form	SMT
Package width	1.25 mm
method of packing	TR, PAPER, 7 INCH
Rated power dissipation(P)	0.125 W
Rated temperature	70 °C
Guideline	AEC-Q200
resistance	294 Ω
Resistor type	FIXED RESISTOR
size code	0805
surface mount	YES
technology	THIN FILM
Temperature Coefficient	3 ppm/°C
Terminal shape	WRAPAROUND
Tolerance	0.5%
Operating Voltage	150 V

WF08B2940DALQ Preview

Approval Sheet

WF25B_Q,WF20B_Q,WF10B_Q

WF12B _Q,WF08B_Q,WF06B_Q

WF04B_Q

1%, 0.5%, 0.25%, 0.1%,0.05%,

0.02%

TC3

High Precision 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.

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Approval Sheet

FEATURE

1. SMD metal film resistor

2. High reliability and stability of 0.3% and below per customer request

3. High performance of TCR: 3 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 Devices

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 WFxxB_Q

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Approval Sheet

QUICK REFERENCE DATA

Item

Series No.

Size Code

WF25B_Q

2512

(6432)

Resistance Tolerance

Resistance Range

TCR

Max. Dissipation at

amb

=70C

Max. Operation Voltage

Max. Overload Voltage

Operation Temperature

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

Rated Power



Resistance

Value

or Max. RCWV listed above, whichever is lower.

General Specification

WF20B_Q

2010

(5025)

WF10B_Q

1210

(3225)

WF12B_Q

1206

(3216)

WF08B_Q

0805

(2012)

WF06B_Q

0603

(1608)

WF04B_Q

0402

(1005)

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

4.7 ~

600K

4.7 ~

360K

4.7 ~

150K

4.7 ~

120K

3

ppm/C

200V

400V

3/4W

200V

400V

2/5W

200V

400V

1/4W

200V

400V

- 55~ +155’C

1/8W

150V

300V

1/10W

75V

150V

1/10W

50V

100V

4.7 ~

80K

4.7 ~

40K

10 ~

8K

Tolerance

0.01%

is upon requested

DIMENSIONS:(unit:mm)

Type

WF25B_Q

6.35



0.10

3.20



0.15

0.60



0.20

0.90



0.25

0.55



0.10

WF20B_Q

5.00



0.10

2.50



0.15

0.60



0.20

0.60



0.25

0.55



0.10

WF10B_Q

3.10



0.10

2.60



0.15

0.50



0.20

0.50



0.20

0.55



0.10

WF12B_Q

3.05



0.15

1.55



0.15

0.40



0.20

0.40



0.20

0.55



0.15

WF08B_Q

2.00



0.10

1.25



0.10

0.25



0.20

0.40



0.20

0.50



0.15

WF06B_Q

1.55



0.10

0.80



0.10

0.25



0.15

0.30



0.15

0.45



0.15

WF04B_Q

1.00



0.10

0.50



0.05

0.15



0.10

0.25



0.10

0.30



0.05

Protective coat

End termination

Resistive layer

Ceramic Substrate

W T

1001

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Approval Sheet

MARKING



3-digits marking for 0603 size

WFxxB has same marking rule as WRxx ±1%.

Nominal resistance

1.E-24 series

2.E-96 series

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=10

，B=10

，C=10

，D=10

，E=10

，F=10

EX :

17.8Ω=25X，178Ω=25A，1K78 =25B

17K8=25C， 178K=25D， 1M78=25E

3. Remark

CODE

R_value

CODE

R_value

Description

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

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 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

4-digits marking

100

1000

6800

6801

47000

4702



No marking code for 0402 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”.

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Approval Sheet

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.

Page 5 of 10

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