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■ WFxxM Series of Trimmable Chip Resistors
■ Feature
1. High precision, reliability and stability
2. Miniature size to 0603(1608)
■ Description
The resistors are constructed on a high-grade ceramic body (aluminum oxide). Internal metal
electrodes are added at each and connected by a resistive paste, which is applied to the
substrate. The composition of the paste is adjusted to give the approximate resistance required.
The resistive layer is converted with a transparent protective coating. Finally the two external
end terminations are added. For case of soldering the outer of theses end terminations is a
lead-tin alloy or Tin solder (Pb free) alloy.
■ Physical Dimensions
13 14
WF20M WF12M WF08M WF06M
L 5.00 ± 0.20 3.10 ± 0.10 2.00 ± 0.10 1.60 ± 0.10
W 2.50 ± 0.20 1.60 ± 0.10 1.25 ± 0.10 0.80 ± 0.10
T 0.55 ± 0.15 0.60 ± 0.15 0.50 ± 0.15 0.45 ± 0.15
Tb 0.65 ± 0.25 0.45 ± 0.20 0.40 ± 0.20 0.30 ± 0.20
Tt 0.60 ± 0.25 0.50 ± 0.20 0.40 ± 0.20 0.30 ± 0.10
■ Quick Reference Data
Series No. WF20M WF12M WF08M WF06M
Unit: mm
Size code 2010 ( 5025 ) 1206 ( 3216 ) 0805 ( 2012 ) 0603 ( 1608 )
Resistance Tolerance 0/-10%(Z), 0/-20%(Y) and 0/-30%(X) E24 series
Resistance Range 1Ω ~ 10MΩ
TCR (ppm/ºC)
≥10Ω ≤ ± 200 ppm/ºC