AC-AT Datasheet, PDF(4/12 Page) Vishay Siliconix – Cemented Leaded Wirewound Resistors

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AC-AT Datasheet, PDF (4/12 Pages) Vishay Siliconix – Cemented Leaded Wirewound Resistors

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www.vishay.com

DESCRIPTION

Wirewound resistors are best suited for use in high power,

high current applications. The silicon cement lacquer

coating enables AC series to withstand challenging

operating and environmental conditions. The coating is

resistant to cleaning solvents specified in IEC 60115-1 (1).

Production is strictly controlled and follows an extensive set

of instructions established for reproducibility.

The winding is done with a specific material on a specially

developed fine ceramic body (Al2O3). The ceramic meets the

highest requirements against mechanical resistance,

thermal shocks, dielectric strength, and insulation

resistance at high temperatures. With different diameters

and turn spacings of resistive wire, a large ohmic value

range can be covered.

The resistors are marked with resistance, rated dissipation

(P40) and tolerance. Product quality is verified by testing

procedures, performed on all individual resistors.

Resistance is measured on the lead wires at a distance of

6 mm from the resistor body. If a greater length of lead wire

is used in the application, the user may need to consider the

additional wire resistance, particularly with low resistance

products.

MATERIALS

Vishay acknowledges the following systems for the

regulation of hazardous substances:

â¢ IEC 62474, Material Declaration for Products of and for the

Electrotechnical Industry, with the list of declarable

substances given therein (2)

â¢ The Global Automotive Declarable Substance List

(GADSL) (3)

â¢ 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:

â¢ 2000/53/EC End-of-Life Vehicle Directive (ELV) and

Annex II (ELV II)

â¢ 2011/65/EU Restriction of the Use of Hazardous

Substances Directive (RoHS) with amendment

2015/863/EU

â¢ 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.

AC, AC-AT

Vishay Draloric

ASSEMBLY

The resistors are axial leaded for soldering. The terminals of

the resistors are completely lead (Pb)-free, the special tin

plating provides compatibility with lead (Pb)-free and

lead-containing soldering processes.

Special lead forms may be available on request, please

inquire at ww1resistors@vishay.com. These components

are high dissipation power resistors, customers are advised

to use a high melting point solder.

APPLICATION INFORMATION

The power dissipation of the resistor generates a

temperature rise with respect to the ambient. The

permissible dissipation is derated for temperatures above

40 Â°C, as shown in the derating diagram, in order to avoid

overheating of the resistor. The heat dissipated from the

resistor may affect adjacent components, hence proper

clearance will be required in order to avoid overheating. The

resistive wire is encapsulated by a protective lacquer

coating.

All materials used are non-flammable and inorganic.

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.

APPROVALS

The AC-AT series is AEC-Q200 qualified, specifically for use

in automotive applications.