ACAS 0612 - Precision

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Vishay Beyschlag

Revision: 12-Apr-13

5

Document Number: 28751

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DESCRIPTION

The production of the components 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 (96 % Al2O3) ceramic substrate

using a mask to separate the adjacent resistors and

conditioned to achieve the desired temperature coefficient.

Specially designed inner contacts are realized on both

sides. A special laser is used to achieve the target value by

smoothly cutting a meander groove in the resistive layer

without damaging the ceramics.

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.

The result of the determined production is verified by an

extensive

testing

procedure

and

optical

inspection

performed on 100 % of the individual chip resistors. Only

accepted products are laid directly into the paper 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 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. The resistors are RoHS

compliant; the pure tin plating provides compatibility with

lead (Pb)-free and lead-containing soldering processes. The

permitted storage time is 20 years, whereas the solderability

is specified for 2 years after production or requalification.

The immunity of the plating against tin whisker growth has

been proven under extensive testing.

All

products

comply

with

the

GADSL (1)

and

the

CEFIC-EECA-EICTA (2)

list

of

legal

restrictions

on

hazardous substances. This includes full compliance with

the following directives:

• 2000/53/EC End of Life Vehicle Directive (ELV) and

Annex II (ELV II)

• 2011/65/EC

Restriction

of

the

use

of

Hazardous

Substances directive (RoHS)

• 2002/96/EC Waste Electrical and Electronic Equipment

Directive (WEEE)

TESTS

Where applicable, the resistors are tested in accordance

with EN 140401-801 which refers to EN 60115-1 and

EN 140400.

Notes

(1) Global Automotive Declarable Substance List, see www.gadsl.org.

(2) CEFIC (European Chemical Industry Council), EECA (European Electronic Component Manufacturers Association), EICTA (European trade

organisation representing the information and communications technology and consumer electronics), see www.eicta.org

 policy 

environmental policy group

 chemicals  jig  Joint Industry Guide (JIG-101 Ed 2.0).

(3) The quoted IEC standards are also released as EN standards with the same number and identical contents.

FUNCTIONAL PERFORMANCE

100

- 55

Ambient Temperature in °C

150

0

050

70

Standard Mode

Precision Mode

20

40

60

80

100

125

180

For permissible resistance change please refer to table MAXIMUM RESISTANCE CHANGE AT RATED POWER

85

Derating