www.vishay.com For technical questions, contact: specialresistors@vishay.com Document Number: 28789
4Revision: 08-Jan-10
TNPS .... ESCC
Vishay Draloric Hi-Rel Thin Film Chip Resistors
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 substrate (Al2O3) and conditioned to achieve the
desired temperature coefficient. Specially designed inner
contacts are deposited on both sides. A special laser is used
to achieve the target value by smoothly fine trimming
resistive layer without damaging the ceramics. A further
conditioning is applied in order to stabilize the trimming
result. The resistor elements are covered by a protective
coating designed for electrical, mechanical and climatic
protection. The terminations receive a final SnPb plating,
controlled for a minimum lead contents of 6 %. The
resistance value is stamped on the coating with a
four-character code system according to IEC 60062 (3). The
result of the determined production is verified by an
extensive testing procedure performed on 100 % of the
individual chip resistors. Only accepted products are placed
into a special matrix case packaging or into antistatic blister
tape in accordance with IEC 60286-3 (3).
ASSEMBLY
The resistors are suitable for processing on automatic SMD
assembly systems. They are suitable for automatic soldering
using wave, reflow or vapour phase as shown in
IEC 61760-1 (3). 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, if applied, shall be qualified
by appropriate means to ensure the long-term stability of the
whole system. Solderability is specified for 2 years after
production. The permitted storage time is 20 years.
APPROVALS
The resistors are approved to ESCC 4001/029. Conformity is
indicated by the ESCC Qualified Components logo on the
package label. Approval is granted by the European Space
Components Coordination and registered in the ESCC
Qualified Parts List, REP005.
The detail specification ESCC 4001/029 has been
established after successful completion of an Evaluation
Test Programme according to ESCC 2264000.
TESTING LEVELS
These products are available with Testing Level B or C
according to the ruling of the generic specification
ESCC 4001, issue 1, and the detail specification
ESCC 4001/029.
For Testing Level C, the production is succeeded by a final
production test sequence for resistance and dimensions.
This sequence is followed by an overload test, a non-linearity
test, measurement of the resistance at room temperature
and a visual inspection. A Certificate of Conformity provides
summary information by reporting the numbers of rejects for
each test or inspection.
For Testing Level B, additional measurements of resistance
at low and high temperatures are performed. The Certificate
of Conformity is completed with a detailed record of all
resistance measurements.
LOT ACCEPTANCE TESTS
Execution of Lot Acceptance Tests according to the ruling of
ESCC 4001, Issue 1 is available as a separate order item.
This is to be combined with the dedicated order line for the
required amount of samples, using packaging code “LX”.
The applicable scope of the Lot Acceptance Tests,
graduated to Level 1, Level 2 and Level 3 is illustrated further
below with the number samples required for each level.
Deliverable item to the Lot Acceptance Tests is the test
report together with the used samples, shipped in waffle tray
package.
Waffle Tray
Note
(3) The quoted IEC standards are also released as EN standards with the same number and identical contents