UMA0204 Datasheet, PDF (3/8 Pages) Vishay Siliconix – Ultra Precision MELF Resistor

Ultra Precision MELF Resistor
UMA 0204
Vishay Beyschlag
DESCRIPTION
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 % Al₂O₃) and conditioned to achieve the
desired temperature stability. Nickel plated steel
terminations are firmly pressed on the metallised rods. A
special laser is used to achieve the target value by smoothly
cutting 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 rings designate the resistance
value and tolerance in accordance with IEC 60062.
Additional colour dots near the fourth ring are used to identify
the temperature coefficient.
The result of the determined production is verified by an
extensive testing procedure under strict temperature control,
performed on 100 % of the individual resistors. Only
accepted products are laid directly into the antistatic blister
tape in accordance with IEC 60286-3.
ASSEMBLY
The resistors are suitable for processing on automatic SMD
assembly systems. They are suitable for automatic soldering
using 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 the
European RoHS directive.
APPROVALS
The resistors are tested in accordance with EN 140401-803
which refers to EN 60115-1, EN 140400 and the variety of
enviromental test procedures of the IEC 60068 series.
Approval of conformity is indicated by the CECC logo on the
package label.
Vishay BEYSCHLAG has achieved "Approval of
Manufacturer" in accordance with EN 100114-1. 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.
Document Number: 28715
Revision: 25-Feb-04
For technical questions contact: [e-mail]
www.vishay.com
3