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V1.0

07/05/25

Thick Film General Purpose Chip Resistors

WR12, WR08, WR06, WR04

Newark.com/multicomp-pro

Farnell.com/multicomp-pro

sg.element14.com/b/multicomp-pro

Storage and Handling Conditions

1. Products are recommended to be used up within two years since operation date as ensured shelf life. Check solderability

in case shelf life extension is needed.

2. To store products with following condition:

Temperature : 5°C to 40°C

Humidity : 20% to 70% relative humidity

3. Caution:

a. Don’t store products in a corrosive environment such as sulfide, chloride gas, or acid.

It may cause oxdization of electrode, which easily be resulted in poor soldering

b. To store products on the shelf and avoid exposure to moisture.

c. Don’t expose products to excessive shock, vibration, direct sunlight and so on

Soldering Condition follows J-STD-020D

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 Figure below.

Infrared soldering profile for Chip Resistors

For SnAgCu series solder pase

480 Sec max to Peak

60–120 Sec

60–150 Sec

30 sec min

Time

260

245

217

150

200

25

max. ramp up rate = 3°C/s

max. ramp down rate = 6°C/s

WR12

X

472_

J

T

L

Size code

WR12 : 1206

WR08 : 0805

WR06 : 0603

WR04: 0402

Type code

X :

Jumper

±5%, 1Ω ~ 10MΩ

±1%, 10Ω ~ 1MΩ

W :

±1%, < 10Ω; >1MΩ

Resistance code

±5%, E24: 2 significant

digits followed by no. of zeros

and a blank

4.7Ω = 4R7_

10Ω = 100_

220Ω = 221_

Jumper = 000_

("_" means a blank)

±1%, E24+E96: 3 significant

digits followed by no. of zeros

102Ω =1020

37.4KΩ =3742

Tolerance

F : ±1%

J : ±5%

P : Jumper

Packaging code

T : 7" Reeled taping

Q : 10" Reeled taping

G : 13" Reeled taping

H : 13" reel 50Kpcs

only for 0402

B : Bulk

D : 7" reel 20Kpcs

only for 0402

A : 7" reel 15Kpcs

only for 0402

Termination

code

L

= Sn base

(lead free)

Catalogue Numbers

The resistors have a catalogue number starting with