CMA 0204
Vishay Beyschlag
High Pulse Load MELF Resistor
FEATURES
•
•
•
•
•
•
•
•
Special carbon film technology
Up to 4 kV single pulse capability
Up to 70 W continuous pulse load
Green product, supports lead-free soldering.
Automotive
Telecommunication
Industrial
Medical equipment
APPLICATIONS
CMA 0204 speciality MELF resistors with advanced pulse
load capability are the perfect choice for the protection of
circuitry with signal or mains input lines from surge pulses.
The resistors are also suitable for circuits exposed to high
levels of electromagnetic interference or electrostatic
discharge. The applications are in all fields of automotive,
telecommunication, industrial and medical equipment.
METRIC SIZES
DIN:
CECC:
0204
RC 3715M
TECHNICAL SPECIFICATIONS
DESCRIPTION
Metric CECC size
Resistance range
Resistance tolerance
Temperature coefficient
Operation mode
Climatic category (LCT/UCT/days)
Rated dissipation,
P
70(1)
Operating voltage,
U
max
AC/DC
Film temperature
Max. resistance change at
P
70
for resistance range,
∆
R
/
R
max., after:
1000 h
8000 h
Specified lifetime
Permissible voltage against ambient (insulation):
1 minute;
U
ins
continuous
Failure rate
Note
1. The power dissipation on the resistor generates a temperature rise against the local ambient, depending on the heatflow support of the
printed-circuit board (thermal resistance). The rated dissipation applies only if the permitted film temperature is not exceeded. Furthermore,
a high level of ambient temperature or of power dissipation may raise the temperature of the solder joint, hence special solder alloys or board
materials may be required to maintain the reliability of the assembly.
Document Number: 28717
Revision: 27-Feb-04
For technical questions contact: ff3bresistors@vishay.com
www.vishay.com
1
300 V
75 V
≤
1
×
10
-9
/h
±1%
±2%
8 000 h
±2%
±4%
10
Ω
to 100 k
Ω
125
°
C
standard
55/125/56
0.25 W
200 V
155
°
C
CMA 0204
RC 3715M
10
Ω
to 100 k
Ω
±2%
see T.C. graph
power
55/155/56
0.4 W
CMA 0204
Vishay Beyschlag
High Pulse Load MELF Resistor
ORDERING INFORMATION -
type description and ordering code
C
FILM TYPE
C = Carbon
M
PRODUCT CODE
M = MELF, cylindrical
A
SIZE CODE
A = 0204
0204
2%
BL
PACKAGING
BL = 3000 units
B0 = 10000 units
47K
RESISTANCE VALUE
See temperature Coefficient
and Resistance Range Table
METRIC DIN SIZE TOLERANCE
0204
±
2%
Note
1. For CMA 0204 the temperature coefficient is not identified in the ordering code.
2. We recommend that the clear text ordering code is used to minimize the possibilty of errors in order handling.
DIMENSIONS
L
Color code marking
(1)
D
D1
K
L1
DIMENSIONS
- MELF resistor types, mass and relevant physical dimensions
TYPE
L
(mm)
3.6 + 0/
−
0.2
D
(mm)
1.4 + 0/
−
0.1
L
1 min
(mm)
1.8
D
1
(mm)
D + 0/
−
0.15
K
(mm)
0.8
±
0.1
MASS
(mg)
19
CMA 0204
Note
1. Color code marking is applied according to IEC 60062 in four bands (E24 series). Each color band appears as a single solid line, voids are
permissible if at least 1/3 of the band is visible from each radial angle of view. The last color band for tolerance is approx, 50 % wider than
the other bands. An interrupted band between the 2nd and 3rd full band identifies the special carbon film type.
TOLERANCE AND RESISTANCE RANGE
RESISTANCE VALUE
(1)
TOLERANCE
CMA 0204
±
2%
10
Ω
to 100 k
Ω
Note
1. Resistance value to be selected from E24 series.
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2
For technical questions contact: ff3bresistors@vishay.com
Document Number: 28717
Revision: 27-Feb-04
CMA 0204
High Pulse Load MELF Resistor
Vishay Beyschlag
DESCRIPTION
Production of the CMA 0204 speciality MELF resistors with
advanced pulse load capability is strictly controlled and
follows an extensive set of instructions established for
reproducibility. A homogeneous and dense carbon film is
deposited on a high grade ceramic body (85 % Al
2
O
3
).
Nickel plated steel termination caps are firmly pressed on
the coated rods. A special laser is used to achieve the target
value by smoothly cutting a helical groove in the resistive
layer without damaging the ceramics. The resistors are
covered by protective coating designed for electrical,
mechanical and climatic protection.The terminations receive
a final pure tin on nickel plating. Four colour code rings
designate the resistance value and tolerance in accordance
with
IEC 60 062
.
The result of the determined production is verified by an
extensive testing procedure performed on 100 % of the
individual resistors. Only accepted products are laid directly
into the blister tape in accordance with
IEC 60 286-3
.
APPROVALS
Where applicable the resistors are tested in accordance with
EN 140401-803
(superseding
CECC 40401-803
) which
refers to
EN 60115-1, EN 140400
and the variety of
enviromental text procedures of the
IEC 60068
series.
Vishay
BEYSCHLAG
has
achieved
"Approval
of
Manufacturer"
in accordance with
EN 100 114-1
. The
release certificate for
“Technology Approval Schedule”
in
accordance with
CECC 240001
based on
EN 100114-6
is
granted for the Vishay BEYSCHLAG manufacturing
process.
ASSEMBLY
The resistors are suitable for processing on automatic SMD
assembly systems. They are suitable for automatic soldering
using wave, reflow or vapour phase. Excellent solderability
is proven, even after extended storage in excess of 10 years.
The encapsulation is resistant to all cleaning solvents
commonly used in the electronics industry, including
alcohols, esters and aqueous solutions. The resistors are
completely lead (Pb)-free, the pure tin plating provides
compatibility with lead (Pb)-free soldering processes. The
immunity of the plating against tin whisker growth has been
proven under extensive testing. All products comply with the
CEFIC-EECA-EICTA list of legal restrictions on hazardous
substances. This includes full compatibility with European
RoHS directive.
Document Number: 28717
Revision: 27-Feb-04
For technical questions contact: ff3bresistors@vishay.com
www.vishay.com
3
CMA 0204
Vishay Beyschlag
FUNCTIONAL PERFORMANCE
Power Dissipation
P
High Pulse Load MELF Resistor
1
CMA 0204
W
0.5
0
-50
0
50
70
100
C
150
Ambient Temperature
ϑ
amb
Derating - Standard Operation
Power Dissipation
P
1
CMA 0204
W
0.5
0
-50
0
50
70
100
C
150
Ambient Temperature
ϑ
amb
Derating - Power Operation
Pulse Load
P
max
100
W
10
CMA 0204
1
0.1
10
µs
100
µs
1 ms
10 ms
100 ms
1s
10 s
Pulse Duration
t
i
Maximum pulse load, single pulse; for permissible resistance change equivalent to 8000 h operation.
Single Pulse
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For technical questions contact: ff3bresistors@vishay.com
Document Number: 28717
Revision: 27-Feb-04
CMA 0204
High Pulse Load MELF Resistor
Vishay Beyschlag
Continuous Pulse Load
P
max
100
W
10
CMA 0204
1
0.1
10
µs
100
µs
1 ms
10 ms
100 ms
1s
10 s
Pulse Duration
t
i
Maximum pulse load, continuous pulses; for permissible resistance change equivalent to 8000 h operation.
Continuous Pulses
Pulse Voltage
U
max
CMA 0204
1 kV
100 V
10
µs
100
µs
1 ms
10 ms
100 ms
1s
10 s
Pulse Duration
t
i
Maximum pulse voltage, single and continuous pulses; for permissible resistance change equivalent to 8000 h operation.
Pulse Voltage
Test Voltage
1 kV
100 V
CMA 0204
10 V
10
Ω
100
Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
Resistance Value
R
Pulse load rating in accordance with IEC 60115-1, 4.27; 1,2
µs
/ 50
µs;
5 pulses at 12 s intervals;
for permissible resistance change 0.5 %.
1.2/50 Pulse
Document Number: 28717
Revision: 27-Feb-04
For technical questions contact: ff3bresistors@vishay.com
www.vishay.com
5
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