General Purpose Surface
Mounted Resistors
WCR Series
Welwyn Components
Figure 1
Construction
Tin Plating
The chips have a high alumina substrate (96% minimum) with
Nickel Barrier
a ruthenium oxide resistance element and silver palladium,
Dipped Conductor
coat
nickel and tin plated terminations. A glazed protection
is applied to the resistive element (See Fig.1)
Epoxy Melamine
Protection
Glass Dielectric
Resistance Element
Terminations
Solderability
Silver
Palladium
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
Strength
The terminations meet requirements of
IEC 68.2.21.
Marking
96% min Alumina Substrate
All resistors are individually marked with 3 digits. The first two
digits are the significant figures and the third defines the
number of added zeros. Jumpers are marked 000. Types 0201
Table 1
and 0402
have no marking.
Resistance
Noise
E96 1% components that can not be marked with 4 digits
will be marked with a standard 3 digit code. Details can be
supplied upon request.
value ohms
dB
-10
0
100R
>100R, 10K
>10K, 100K
>100K, 1M0
>1M0
+15
+20
+30
Solvent Resistance
The protective epoxy lacquer and marking are resistant to all
normal industrial cleaning fluids suitable for printed circuits.
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Packaging
Packaging
All chips are tape mounted and supplied on standard 8mm
Chip Resistor Labstock For Designers
All chips are tape mounted and supplied on standard 8mm
tape reel, as IEC publication 286-3.
Chip Resistor Labstock For Designers
WCR chip resistors are available in a special package of the most
tape reel, as IEC publication 286-3.
WCR chip resistors are available in a special package of the most
popular sizes containing 50 each of the E24 values.
180mm (7 inch) reel is standard
180mm (7 inch) reel is standard carries 5,000 pieces.
popular sizes containing 50 each of the E24 values.
250mm (10 inch) reel carrying double the standard quantity
Please contact the sales desk for full details of this excellent
(Except 0402 carries
10,000 pieces)
Please contact the sales desk for full details of this excellent
solution for designers and your prototype build requirements.
can be supplied by agreement.
250mm (10 inch) reel carrying double the standard quantity
solution for designers and your prototype build requirements.
can be supplied by agreement.
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
•
Issue D · 07.03
Issue E 02.07