BCcomponents
Product specification
Precision MELF resistors
FEATURES
MMU 0102; MMA 0204;
MMB 0207
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.
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-free, the pure tin plating
provides compatibility with lead-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.
The resistors are tested in accordance with
EN 140 401-803 (superseding CECC 40 401-803)
which
refers to
EN 60115-1
and
EN140 400.
Approval of
conformity is indicated by the CECC logo on the package
label.
BCcomponents BEYSCHLAG has achieved
"Approval of
Manufacturer"
in accordance with
EN 100 114-1.
The
release certificate for
"Technology Approval Schedule"
in
accordance with
CECC 240 001
based on
EN 100 114-6
is
granted for the BCcomponents BEYSCHLAG manufacturing
process.
On request, resistors are available with established
reliability in accordance with
EN 140 401-803 Version E.
Please refer to the special data sheet for information on
failure rate level, available resistance ranges and ordering
codes.
·
Advanced thin film technology
·
Lowest TC: 15 to 25 ppm/K
·
Precision tolerance of value:
±
0,1 and
±
0,25%
·
Superior overall stability: Class 0,05
·
Wide precision range: 10
W
to 1 M
W
·
Green product, supports lead-free soldering.
Metric sizes
DIN:
CECC:
0102
RC 2211M
0204
RC 3715M
0207
RC 6123M
APPLICATIONS
·
Test and measuring equipment
·
Industrial and medical electronics.
DESCRIPTION
MMU 0102, MMA 0204 and MMB 0207 precision thin film
MELF resistors combine the proven reliability of the
professional products with an advanced level of precision
and stability. Therefore they are perfectly suited for
applications in the fields of test and measuring equipment
along with industrial and medical electronics.
Production is strictly controlled and follows an extensive set
of instructions established for reproducibility. A
homogeneous film of metal alloy is deposited on a high
grade ceramic body (85% Al
2
O
3
, for MICRO-MELF: 96%
Al
2
O
3
) and conditioned to achieve the desired temperature
coefficient. Nickel plated steel termination caps are firmly
pressed on the metallised 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.
A further conditioning is applied in order to stabilise the
trimming result. The resistor elements are covered by a
protective coating designed for electrical, mechanical and
climatic protection. The terminations receive a final pure tin
on nickel plating. Five colour code rings designate the
resistance value and tolerance in accordance with
IEC 60 062.
2002 Nov 22
2
BCcomponents
Product specification
Precision MELF resistors
ORDERING INFORMATION
MMU 0102; MMA 0204;
MMB 0207
Components may be ordered by using either a simple clear text ordering code, see “Type description and ordering code”
or BCcomponents’ unique 12NC.
Numeric Ordering code (12NC)
·
The resistors have a 12-digit ordering code starting with 2312.
·
The subsequent 4 digits indicate the resistor type, specification and packaging; see Table 2.
·
The remaining 4 digits indicate the resistance value:
– The first 3 digits indicate the resistance value.
– The last digit indicates the resistance decade in accordance with Table 3.
Table 2
12NC ordering code indicating resistor type and packaging
DESCRIPTION
B1
1 000
units
171 6....
171 7....
172 5....
172 6....
172 7....
141 6....
141 7....
142 5....
142 6....
142 7....
181 6....
181 7....
182 7....
ORDERING CODE 2312 ... .....
BLISTER TAPE ON REEL
TOL.
B2
2 000
units
BL
3 000
units
166 6....
166 7....
167 5....
167 6....
167 7....
156 6....
156 7....
157 5....
157 6....
157 7....
B7
7 000
units
B0
10 000
units
176 6....
176 7....
177 5....
177 6....
177 7....
146 6....
146 7....
147 5....
147 6....
147 7....
BULK CASE
M3
3 000
units
M8
8 000
units
061 6....
061 7....
062 5....
062 6....
062 7....
TYPE
T.C.
±
0,25%
±
25 ppm/K
±
0,1%
±
0,5%
±
15 ppm/K
±
0,25%
±
0,1%
±
0,25%
±
25 ppm/K
±
0,1%
±
0,5%
±
15 ppm/K
±
0,25%
±
0,1%
±
0,25%
±
25 ppm/K
MMB 0207
-
-
-
-
-
-
-
-
-
-
196 6....
196 7....
197 7....
-
-
-
-
-
-
-
-
-
-
186 6....
186 7....
187 7....
-
-
-
-
-
041 6....
041 7....
042 5....
042 6....
042 7....
MMU 0102
-
-
-
-
-
-
-
-
MMA 0204
-
-
-
-
-
-
-
-
-
±
0,1%
±
0,1%
±
15 ppm/K
Resistance ranges printed in bold are preferred T.C. / tolerance combinations with optimized availability.
2002 Nov 22
5
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