MMU 0102, MMA 0204, MMB 0207 - Professional

www.vishay.com

Vishay Beyschlag

Revision: 20-Jan-2026

4

Document Number: 28713

For technical questions, contact: melf@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

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 (Al2O3) 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. The resistor elements are

covered by a protective coating designed for electrical,

mechanical and climatic protection. The terminations

receive a final pure matte tin on nickel plating. Four or five

color code rings designate the resistance value and

tolerance

in

accordance

with

IEC

60062

(1).

The result of the determined production is verified by an

extensive testing procedure performed on 100 % of the

individual resistors. This includes full screening for the

elimination of products with a potential risk of early field

failures (feasible for

R ≥ 10 Ω) according to EN 140401-803,

2.1.2.2. Only accepted products are laid directly into the

blister tape in accordance with IEC 60286-3, Type 2a (1).

ASSEMBLY

The resistors are suitable for processing on automatic SMD

assembly systems. They are suitable for automatic

soldering using wave, reflow or vapor phase as shown in

IEC 61760-1 (1)

. 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, potting compounds

and their processes, if applied, shall be qualified by

appropriate means to ensure the long term stability of the

whole

system.

The resistors are completely lead (Pb)-free, the pure matte

tin plating provides compatibility with lead (Pb)-free and

lead

containing

soldering

processes.

Solderability

is

specified for 2 years after production or requalification,

however, excellent solderability is proven after extended

storage in excess of 10 years. The permitted storage time is

20 years. The immunity of the plating against tin whisker

growth has been proven under extensive testing.

MATERIALS

Vishay acknowledges the following systems for the

regulation of hazardous substances:

• IEC 62474, Material Declaration for Products of and for

the Electrotechnical Industry, with the list of declarable

substances given therein (2)

• The

Global

Automotive

Declarable

Substance

List

(GADSL) (3)

•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:

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

Annex II (ELV II)

• 2011/65/EU

Restriction

of

the

Use

of

Hazardous

Substances

Directive

(RoHS)

with

amendment

2015/863/EU

• 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.

APPROVALS

Where applicable, the resistors are approved within the

IECQ-CECC Quality Assessment System for Electronic

Components to the detail specification EN 140401-803

which refers to EN 60115-1, EN 60115-8 and the variety of

environmental test procedures of the IEC 60068 (1) series.

Conformity is attested by the use of the CECC logo (

) as

the mark of conformity on the package label. Vishay

Beyschlag has achieved “Approval of Manufacturer” in

accordance with IECQ 03-1. The release certificate for

“Technology Approval Schedule” in accordance with

CECC 240001 based on IECQ 03-3-1 is granted for the

Vishay Beyschlag manufacturing process.

The resistors are qualified according to AEC-Q200.

RELATED PRODUCTS

For products with precision specification see the datasheet:

• “Precision Thin Film MELF Resistors”

(www.vishay.com/doc?28714)

• “Ultra Precision Thin Film MELF Resistors”

(www.vishay.com/doc?28715)

Resistors are available with established reliability in

accordance with EN 140401-803 Version E. Please refer to

datasheet “MELF Resistors with Established Reliability”.

(www.vishay.com/doc?28707)

Notes

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

(2) The IEC 62474 list of declarable substances is maintained in a dedicated database, which is available at http://std.iec.ch/iec62474

(3) The Global Automotive Declarable Substance List (GADSL) is maintained by the American Chemistry Council and available at www.gadsl.org

(4) The SVHC list is maintained by the European Chemical Agency (ECHA) and available at http://echa.europa.eu/candidate-list-table