WR18X144FTL datasheet, PDF - EEWORLD Datasheet

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WR18X144FTL: DescriptionFixed Resistor, Metal Glaze/thick Film, 1W, 140000ohm, 200V, 1% +/-Tol, 100ppm/Cel, Surface Mount, 1218, CHIP; CategoryPassive components The resistor; File Size603KB，7 Pages; ManufacturerWalsin Technology Corporation; Environmental Compliance

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WR18X144FTL Overview

Fixed Resistor, Metal Glaze/thick Film, 1W, 140000ohm, 200V, 1% +/-Tol, 100ppm/Cel, Surface Mount, 1218, CHIP

WR18X144FTL Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Objectid	145091103226
package instruction	CHIP
Reach Compliance Code	unknown
Country Of Origin	Mainland China
ECCN code	EAR99
YTEOL	7.38
Other features	LASER TRIMMABLE, RATED AC VOLTAGE (V):200
structure	Rectangular
JESD-609 code	e3
Installation features	SURFACE MOUNT
Number of terminals	2
Maximum operating temperature	155 °C
Minimum operating temperature	-55 °C
Package height	0.55 mm
Package length	3.05 mm
Package form	SMT
Package width	4.6 mm
method of packing	TR, PLASTIC, 10 INCH
Rated power dissipation(P)	1 W
Rated temperature	70 °C
resistance	140000 Ω
Resistor type	FIXED RESISTOR
size code	1218
surface mount	YES
technology	METAL GLAZE/THICK FILM
Temperature Coefficient	100 ppm/°C
Terminal surface	TIN
Terminal shape	WRAPAROUND
Tolerance	1%
Operating Voltage	200 V

WR18X144FTL Preview

Approval sheet

WR18X(W), WR20X(W), WR25X(W)

1%, 5%

Thick Film Power Chip Resistors

Size 1218,2010,2512

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

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Approval sheet

FEATURE

High power rating and compact size

High reliability and stability

Reduced size of final equipment

RoHS compliant and Lead free products

APPLICATION



Power supply

PDA

Digital meter

Computer

Automotives

Battery charger

DC-DC power converter

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. Construction of 2512, 2010 Chip-R

Fig 2. Construction of a 1218 Chip-R

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Approval sheet

QUICK REFERENCE DATA

Item

Series No.

Size code

Resistance Tolerance

Resistance Range

TCR (ppm/C) :

10< Rn



10M

1 Rn



10

Max. dissipation at T

amb

=70C

Max. Operation Voltage (DC or RMS)

Max. Overload Voltage (DC or RMS)

Operation temperature

Storage temperature



100 ppm/C



200 ppm/C

200V

400V

WR18X(W)

1218(3248)

General Specification

WR20X(W)

2010 ( 5025 ),

5%

(E24);

1%

(E24+E96)

1 ~ 10M, Jumper (0)



100 ppm/C



200 ppm/C

0.75 W

200V

400V

-55 ~ +155’C

5 ~ 40’C



100 ppm/C



200 ppm/C

250V

500V

WR25X(W)

2512(6432)

Test conditions for jumper ( 0 ohm )

Type

Power Rating At 70C

Resistance

Rated Current

Peak Current

Operating Temperature

WR18X(W)

Max. 50mR

4.5 A

11 A

-55C ~ 155C

WR20X(W)

3/4 W

Max. 50mR

3.8 A

-55C ~ 155C

WR25X(W)

Max. 50mR

4.5 A

11 A

-55C ~ 155C

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

RatedPower



Resistance Value

or Max. RCWV listed above, whichever is lower.

Max. Operation Current : So called RCWC (Rated Continuous Working Current) is determined by

RCWC

Rated Power / Resistance Value

MECHANICAL DATA (unit : mm)

TYPE

WR18

3.050.15

4.600.20

0.550.10

0.450.25

0.500.25

WR20

5.000.20

2.500.20

0.550.10

0.650.25

0.600.25

WR25

6.400.20

3.200.20

0.600.10

0.650.25

0.900.25

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Approval sheet

MARKING

Each resistor is marked with

value.

Example:

1R00

1001

0000

a four-digit code on the protective coating to designate the nominal resistance

1

1000

0

FUNCTIONAL DESCRIPTION

Product characterization

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

5%

1%.

The values of the E24/E96 series are in accordance with “IEC publication 60063”.

Derating curve

The power that the resistor can dissipate depends on the operating temperature; see Fig.3

Figure 3. 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.

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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. 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 below.

CATALOGUE NUMBERS

3-5 sec

The resistors have a catalogue number starting with .

WR20

Size code

WR25 : 2512

WR20 : 2010

WR18: 1218

Type code

5%:

1-10M

1%:

10-1M

1% : <10 or

>1M

472_

Resistance code

E24 : 2 significant digits

followed by no. of zeros and

a blank

4.7

10

=4R7_

=100_

Tolerance

J :

5%

F :

1%

P : Jumper

Packaging code

T : 7” Reel taping

(T:1218 10” Reel)

Q : 10” Reel taping

G : 13” Reel taping

Termination code

Sn base (lead

free)

1% E24+E96:

3 significant digits

followed by no. of zeros

102

37.4K

=1020

=3742

Page 5 of 7

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