
UMA 0204
Vishay Beyschlag
Ultra Precision MELF Resistor
Document Number: 28715
Revision: 25-Feb-04
For technical questions contact: ff3bresistors@vishay.com
www.vishay.com
5
TESTS AND REQUIREMENTS
All tests are carried out in accordance with the following 
specifications:
EN 60115-1, generic specification
EN 140400, sectional specification
EN 140401-803, detail specification
The components are approved in accordance with the
IECQ-CECC-system, where applicable. For the full test
schedule refer to the documents listed above. The testing
also covers most of the requirements specified by
EIA/IS-703 and JIS-C-5202.
The tests are carried out in accordance with IEC 60068 and
under standard atmospheric conditions in accordance with 
IEC 60068-1, 5.3. Climatic category LCT/UCT/56 (rated
temperature range: Lower Category Temperature, Upper
Category Temperature; damp heat, long term, 56 days) is
valid.
Unless otherwise specified the following values apply:
Temperature: 15 C to 35 C
Relative humidity: 45 % to 75 %
Air pressure: 86 kPa to 106 kPa (860 mbar to1 060 mbar).
The components are mounted for testing on printed-circuit
boards in accordance with EN 140400, 2.3.3, unless
otherwise specified.
The requirements stated below  are based on the required
tests and permitted limits of EN 140401-803. However,
some additional tests and a number of improvements
against those minimum requirements have been included.
The stated requirements for long-term tests are typically
fulfilled with a statistical safety of at least +5 s.
x
TEST PROCEDURES AND REQUIREMENTS
EN 
60115-1
CLAUSE
IEC
60068-2
TEST
METHOD
TEST
PROCEDURE
REQUIREMENTS
PERMISSIBLE CHANGE (
R
/
R
)
STABILITY 
CLASS 0.05 
OR BETTER
STABILITY 
CLASS 0.1 
OR BETTER
STABILITY 
CLASS 0.25 
OR BETTER
stability for product types:
UMA 0204
100 
 to 100 k
43 
 to 221 k
22 
 to 332 k
4.5
resistance
± 0.25 %; ± 0.1 %; ± 0.05 %; ± 0.02 %; 
4.8.4.2
temperature 
coefficient
at 20 / 
10 / 20 
°
C 
and 20 / 85 / 20 
°
C
± 10 ppm/K; ± 05 ppm/K
at 
20 / 
55 / 20 
°
C 
and 20 / 125 / 20 
°
C
±15 ppm/K
4.25.1
endurance at 
70 
°
C:
precision operation 
U
 = 
≤
U
max
; 
1.5 h on; 0.5 h off;
70 
°
C; 1000 h
± (0.02 %
R 
+ 1 m
)
70 
°
C; 8000 h
± (0.05 %
R 
+ 1 m
)
endurance at 
70 
°
C:
standard operating
mode
U
 = 
≤
U
max
; 
1.5 h on; 0.5 h off;
70 
°
C; 1000 h
± (0.05 %
R 
+ 1 m
)
70 
°
C; 8000 h
± (0.1 %
R 
+ 1 m
)
4.25.3
endurance at 
upper category 
temperature
85 
°
C; 1000 h
± (0.01 %
R
 + 1 m
) ± (0.05 %
R
 + 1 m
) ± (0.1 %
R
 + 1 m
)
125 
°
C; 1000 h
± (0.05 %
R
 + 1 m
)
± (0.1 %
R 
+ 1 m
)
± (0.15 %
R
 + 1 m
)
4.24
78 (Cab)
damp heat, steady 
state
(40 ±
2) 
°
C; 56 days; 
(93 ±
3) % RH
± (0.03 %
R
 + 1 m
) ± (0.05 %
R
 + 1 m
) ± (0.1 %
R
 + 1 m
)
P
70
R
×
P
70
R
×