
UMA 0204
Vishay Beyschlag
Ultra Precision MELF Resistor
www.vishay.com
6
For technical questions contact: ff3bresistors@vishay.com
Document Number: 28715
Revision: 25-Feb-04
TEST PROCEDURES AND REQUIREMENTS 
- continued
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
4.39
67 (Cy)
damp heat, steady 
state, accelerated
(85 ±
2) 
°
C; 
(85 ± 5) % RH; 
U
 = 0.1 
×
1000 h
≤
100 V; 
± (0.1 %
R
 + 1 m
)
 ± (0.25 %
R 
+ 1 m
)
4.23
climatic sequence:
4.23.2
2 (Ba)
dry heat
UCT; 16 h 
4.23.3
30 (Db)
damp heat, cyclic
55 
°
C; 24 h; 
≥
90 % RH; 1 cycle
4.23.4
1 (Aa)
cold
LCT 
°
C; 2 h
4.23.5
13 (M)
low air pressure
8.5 kPa; 2 h; (25 
±
 10) 
°
C
4.23.6
30 (Db)
damp heat, cyclic
55 
°
C; 24 h; 
≥
90 % RH; 5 cycles
LCT = 
10 
°
C; UCT = 85 
°
C
±
(0.03 %
R
 + 1 m
) ± (0.05 %
R
 + 1 m
)
-
LCT = 
55 
°
C; UCT = 125 
°
C
-
-
± (0.1 %
R
 + 1 m
)
1 (Aa)
cold
55 
°
C; 2 h
± (0.02 %
R 
+ 1 m
)
4.19
14 (Na)
rapid change of 
temperature
30 minutes at LCT; 
30 minutes at UCT; 
LCT = 
10 
°
C; 
UCT = 85 
°
C
5 cycles
± (0.01 %
R
 + 1 m
) ± (0.02 %
R
 + 1 m
)
-
1000 cycles
± (0.05 %
R
 + 1 m
) ± (0.05 %
R
 + 1 m
)
-
LCT = 
55 
°
C; UCT = 125 
°
C
5 cycles
-
-
± (0.025 %
R
 + 1 m
)
1000 cycles
-
-
± (0.1 %
R
 + 1 m
)
4.13
short time overload; 
precision operation 
mode
U
 = 2.5 
×
≤
2 
×
U
max
; 
5 s
± (0.005 %
R
 + 1 m
)
± (0.01 %
R
 + 1 m
)
short time overload; 
standard operation 
mode
U
 = 2,5 
×
≤
2 
×
U
max
; 
5 s
± (0.01 %
R
 + 1 m
)
4.27
single pulse high 
voltage overload; 
standard mode
severity no. 4: 
U
 = 10 
×
≤
2 
×
U
max
; 
10 pulses 10 
μ
s/700 
μ
s
± (0.25 %
R
 + 5 m
) 
(1)
4.37
periodic electric 
overload; 
standard mode
U
 = 
≤
2 
×
U
max
; 
0.1 s on; 2.5 s off; 1000 cycles
± (0.5 %
R
 + 5 m
) 
(1)
P
70
R
×
P
70
R
×
P
70
R
×
P
70
R
×
15
P
70
×
R
×