CMA 0204
www.vishay.com
Vishay Beyschlag
High Pulse Load Carbon Film MINI-MELF Resistors
FEATURES
• Special carbon film technology
• Surge voltage capability up to 4 kV 1.2/50 μs
pulse
• ESD capability: 6 kV, human body model
• AEC-Q200 qualified
• Intrinsic sulfur resistance
• Material categorization:
for definitions of compliance please see
www.vishay.com/doc?99912
CMA 0204 carbon film 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.
APPLICATIONS
• Automotive
• Telecommunication
• Industrial
• Medical equipment
TECHNICAL SPECIFICATIONS
DESCRIPTION
DIN size
Metric size code
Resistance range
Resistance tolerance
Temperature coefficient
Rated dissipation,
P
70
(1)
CMA 0204
0204
RC3715M
10
to 100 k
±2%
see TCR graph
0.4 W
200 V
155 °C
-55 °C to 155 °C
1 min;
U
ins
300 V
0.1
x 10
-9
/h
Operating voltage,
U
max.
AC
RMS
/DC
Permissible film temperature,
F max. (1)
Operating temperature range
(1)
Permissible voltage against ambient (insulation):
Failure rate: FIT
observed
Note
(1)
Please refer to APPLICATION INFORMATION below
APPLICATION INFORMATION
The power dissipation on the resistor generates a temperature rise against the local ambient, depending on the heat flow
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.
These resistors do not feature a limited lifetime when operated within the permissible limits. However, resistance value drift
increasing over operating time may result in exceeding a limit acceptable to the specific application, thereby establishing a
functional lifetime. At the maximum permissible film temperature of 155 °C the useful lifetime is specified for 8000 h. The
designer may estimate the performance of the particular resistor application or set certain load and temperature limits in order
to maintain a desired stability.
Revision: 27-Mar-17
Document Number: 28717
1
For technical questions, contact:
melf@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
CMA 0204
www.vishay.com
DESCRIPTION
Production of the CMA 0204 specialty 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 matte tin on nickel plating. Four color code rings
designate the resistance value and tolerance in accordance
with
IEC 60062
(1)
.
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 60286-3,
Type 2a
(1)
.
Vishay Beyschlag
MATERIALS
Vishay acknowledges the following systems for the
regulation of hazardous substances:
• IEC 62474, Material Declaration for Products of and for the
Electrotechnical Industry, with the list of declarable
substances given therein
(2)
• The Global Automotive Declarable Substance List
(GADSL)
(3)
• The REACH regulation (1907/2006/EC) and the related list
of substances with very high concern (SVHC)
(4)
for its
supply chain
The products do not contain any of the banned substances
as per IEC 62474, GADSL, or the SVHC list, see
www.vishay.com/how/leadfree.
Hence the products fully comply with the following
directives:
• 2000/53/EC End-of-Life Vehicle Directive (ELV) and
Annex II (ELV II)
• 2011/65/EU Restriction of the Use of Hazardous
Substances
Directive
(RoHS)
with
amendment
2015/863/EU
• 2012/19/EU Waste Electrical and Electronic Equipment
Directive (WEEE)
Vishay pursues the elimination of conflict minerals from its
supply chain, see the Conflict Minerals Policy at
www.vishay.com/doc?49037.
ASSEMBLY
The resistors are suitable for processing on automatic SMD
assembly systems. They are suitable for automatic
soldering using wave, reflow or vapor phase as shown in
IEC 61760-1
(1)
. Solderability is specified for 2 years after
production
or
requalification,
however,
excellent
solderability is proven after extended storage in excess of
10 years. The permitted storage time is 20 years.
The resistors are completely lead (Pb)-free, the pure matte
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.
The encapsulation is resistant to all cleaning solvents
commonly used in the electronics industry, including
alcohols, esters and aqueous solutions. The suitability of
conformal coatings, potting compounds and their
processes, if applied, shall be qualified by appropriate
means to ensure the long-term stability of the whole system.
APPROVALS
Where applicable the resistors are tested in accordance with
EN 140 401-803
which refers to
EN 60115-1, EN 60115-8
and the variety of environmental test procedures of the
IEC 60068
(1)
series.
Vishay
Beyschlag
has
achieved
“Approval
of
Manufacturer”
in accordance with
IECQ 03-1.
The release
certificate for “Technology
Approval Schedule”
in
accordance with
CECC 240001
based on
IECQ 03-3-1
is
granted for the Vishay Beyschlag manufacturing process.
The resistors are qualified according to AEC-Q200.
RELATED PRODUCTS
• “Professional Thin Film MELF Resistors”
(www.vishay.com/doc?28713)
• “Precision Thin Film MELF Resistors”
(www.vishay.com/doc?28714)
• “High Pulse Load Carbon Film MELF Resistors of case
size 0207” (www.vishay.com/doc?28755)
Notes
(1)
The quoted IEC standards are also released as EN standards with the same number and identical contents
(2)
The IEC 62474 list of declarable substances is maintained in a dedicated database, which is available at
http://std.iec.ch/iec62474
(3)
The Global Automotive Declarable Substance List (GADSL) is maintained by the American Chemistry Council and available at
www.gadsl.org
(4)
The SVHC list is maintained by the European Chemical Agency (ECHA) and available at
http://echa.europa.eu/candidate-list-table
Revision: 27-Mar-17
Document Number: 28717
3
For technical questions, contact:
melf@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
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