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SF25U1821DTLQ

更新时间：2025-06-11 09:11:05

品牌：WALSIN

描述：Anti-Sulfuration & AEC-Q200 Thin Film Chip Resistor /SF.Q Series 1820Ω, ±0.5%, ≦±25, 3/4W

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SF25U1821DTLQ 概述

Anti-Sulfuration & AEC-Q200 Thin Film Chip Resistor /SF.Q Series 1820Ω, ±0.5%, ≦±25, 3/4W

SF25U1821DTLQ 数据手册

通过下载SF25U1821DTLQ数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。

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Approval Sheet

WF25T/U_Q,WF20T/U_Q,WF10T/U_Q,

WF12T/U_Q,WF08T/U_Q,WF06T/U_Q,

WF04T/U_Q.

1%,0.5%,0.25%,0.1%,0.05%,0.02%.

TC50.TC25

High Precision Thin Film Chip Resistors

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

0402.

AEC-Q200 Compliant

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

Page 1 of 10

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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: 50&25 ppm/C and below per customer request

4. Low current noise

5. RoHS compliant and lead free

6. AEC-Q200 compliant

APPLICATION



Automotive

Medical equipment

Measuring instrument

Communication devices

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 WFxx_Q

Page 2 of 10

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Feb - 2018

Approval Sheet

QUICK REFERENCE DATA

Item

General Specification

Series No.

WF25

T&U_Q

2512

WF20

T&U_Q

2010

WF10

WF12

T&U_Q

1206

WF08

WF06

WF04

T&U_Q

0402

T&U_Q

1210

T&U_Q

0805

T&U_Q

0603

Size Code

(6432)

(5025)

(3225)

(3216)

(2012)

(1608)

(1005)

Resistance Tolerance

Resistance Range

TCR

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

10 ~

1.5M

10 ~

1.5M

10 ~

1M

4.7 ~

1M

4.7 ~

1M

4.7 ~

330K

10 ~

100K

50 / 25 ppm/C

Max. Dissipation at

3/4W

1/2W

1/4W

1/8W

1/10W

1/16W

T_amb=70C

Max. Operation Voltage

200V

400V

200V

400V

200V

400V

200V

100V

200V

50V

Max. Overload Voltage

Operating Temperature

400V

100V

- 55~ +155’C

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.

DIMENSIONS:(unit:mm)

WF25_Q

WF20_Q

WF10_Q

WF12_Q

WF08_Q

WF06_Q

WF04_Q

Type

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

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

0.60  0.20 0.60  0.20 0.50  0.20 0.40  0.20 0.25  0.20 0.25  0.15 0.30  0.15

0.90  0.25 0.60  0.25 0.50  0.20 0.40  0.20 0.40  0.20 0.30  0.15 0.30  0.15

0.55  0.10 0.55  0.10 0.55  0.10 0.55  0.15 0.50  0.15 0.45  0.15 0.35  0.05

Protective coat

End termination

Resistive layer

Ceramic Substrate

1001

Page 3 of 10

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Feb - 2018

Approval Sheet

MARKING



3-digits marking for 0603 size

WFxxT/U has same marking rule as WRxx ±1%.

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 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

1000

6801

4702

4-digits marking



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”.

Page 4 of 10

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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

ASC_WFxxT&U_Q_V02

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Approval Sheet

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

Average ramp-up rate (217C to 260C)

Between 150 and 200C

> 217C

Exposure Time

Less than 3C/second

Between 60-120 seconds

Between 60-150 seconds

260ºC +0/-5C

Peak Temperature

Min. 30 seconds

Time within 245C

Ramp-down rate (Peak to 217C)

Time from 25C to Peak

Less than 6C/second

No greater than 480 seconds

Page 6 of 10

ASC_WFxxT&U_Q_V02

Feb - 2018

Approval Sheet

CATALOGUE NUMBERS

The resistors have a catalogue number starting with .

WF06

T/U

xxxx

Size code

Type code

Resistance code

Tolerance

U : 0.02%

A : 0.05%

B : 0.10%

C : 0.25%

D : 0.50%

F : 1.00%

Packaging code

Termination

code

Special code

Q : AEC-Q200

Compliant

WF25: 2512

WF20: 2010

WF10: 1210

WF12: 1206

WF08: 0805

WF06: 0603

WF04: 0402

T: TCR = 50 ppm

U: TCR = 25 ppm

R is first code followed

T : 7” Reel & Taped

significant

L : lead free

V : 7” Reel & Taped

1Kpcs

digits.

100

=1000

37.4K =3742

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

5,000pcs/reel for WF10_Q, WF12_Q, WF08_Q, WF06_Q,

10,000pcs/reel for WF04_Q;

2. Reeled tape packaging: 12mm width paper taping

4,000pcs/reel for WF25_Q, WF20_Q.

Page 7 of 10

ASC_WFxxT&U_Q_V02

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Approval Sheet

TEST AND REQUIREMENTS

REQUIREMENT

Resistor

TEST

PROCEDURE

Within the specified tolerance

Electrical Characteristics

- DC resistance values measurement

IEC 60115-1 4.8

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

Natural resistance change per change in degree

centigrade.

6_(ppm/C)



₁²t₂t¹₁

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)

Short time overload

(S.T.O.L)

R/R max. ±(0.1%+0.05)

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.

IEC60115-1 4.13

Resistance to soldering

heat(R.S.H)

AEC Q200-15

no visible damage

Un-mounted chips completely immersed for 10±1second

in a SAC solder bath at 260℃±5ºC

 R/R max. ±(0.2%+0.05)

good tinning (>95% covered)

no visible damage

Solderability

Un-mounted chips completely immersed for 2±0.5 second

in a SAC solder bath at 235℃±5℃

IEC 60068-2-58

Temperature cycling

MIL-STD-202 Method 107

Test –55 to 125℃/ dwell time 30min/ Max transfer time

20sec 1000 cycles

no visible damage

R/R max. ±(0.3%+0.05)

Test 1000 hours/ at 85℃/85% RH./ 10% of operation

power.

Measurement at 24±4 hours after test conclusion

Biased Humidity

R/R max. (0.3%+0.05)

MIL-STD-202 Method 103

Operational Life

MIL-STD-202 -108

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

continuously

R/R max. (0.3%+0.05)

High Temperature

Exposure

MIL-STD-202-108

1,000 hours at 155℃, un-powered

R/R max. (0.3%+0.05)

R/R max. (0.25%+0.05)

Mechanical Shock

1/2 Sine Pulse / 100g Peak / Velocity 12.3ft/sec

MIL-STD-202 Method 213

Vibration

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

R/R max. (0.1%+0.05)

MIL-STD-202 Method 204

Terminal strength

1kg for 60 s

No broken

AEC-Q200-006

R/R max. (0.1%+0.05)

Board flex

Bending 2mm for 60 sec

AEC-Q200-005

Page 8 of 10

ASC_WFxxT&U_Q_V02

Feb - 2018

Approval Sheet

PACKAGING

Paper Tape specifications (unit :mm)

Series No.

WF25

WF20

WF12

WF10

WF08

WF06

WF04

Tape

Plastic

Paper

6.90±0.20

5.50±0.20

3.60±0.20

2.40±0.20

1.90±0.20

1.20±0.10

3.60±0.20

2.80±0.20

2.00±0.20

3.00±0.20

1.65±0.20

1.10±0.20

0.7±0.10

12.00±0.30

8.00±0.30

8.00±0.20

5.50±0.10

3.50±0.20

3.50±0.05

1.75±0.10

Series No.

WF25

D

0.1

4.00±0.10

Max 1.2

1.50

0.0

0.1

0.0

WF20

WF12

WF10

WF08

WF06

4.00±0.10

Max 1.2

Max. 1.0

0.65±0.05

0.1

0.0

0.1

0.0

0.1

0.0

0.1

0.0

0.1

0.0

2.00±0.10

4.00±0.10

0.40±0.05

WF04

Page 9 of 10

ASC_WFxxT&U_Q_V02

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Approval Sheet

Reel dimensions

WF25 , WF20

Symbol

(unit : mm)

13.0±0.2

14.0±0.5

178.0±2.0

60.0±1.0

WF12 , WF10 , WF08, WF06 , WF04

Symbol

(unit : mm)

13.0±0.2

9.0±0.5

178.0±2.0

60.0±1.0

Taping quantity

Chip resistors 4,000 pcs per reel ( WF25_Q, WF20_Q )

Chip resistors 5,000 pcs per reel ( WF10_Q, WF12_Q, WF08_Q, WF06_Q )

Chip resistors 10,000 pcs per reel ( WF04_Q )

Page 10 of 10

ASC_WFxxT&U_Q_V02

Feb - 2018

SF25U1821DTLQ 相关器件

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