PSS

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Vishay Electro-Films

Revision: 26-Sep-2018

3

Document Number: 61111

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

PROTECTIVE COATING

Vishay Electro-Films (EFI) has developed several patternable overcoat options to protect the resistors and other critical areas

from mechanical damage during handling. It is essential to overcoat resistors of 0.1 % or tighter tolerances to maintain tolerance

during assembly and test of the hybrid, and it is beneficial to overcoat all resistors.

Notes

In summary NiCr will perform at higher sheet resistance with lower TCR than TaN giving higher resistance values in less area.

TaN will continue to perform in a moisture environment but NiCr will require a hermetic package to maintain resistance values.

Both resistive films will work in highly demanding environments for a wide range of applications with VEFI thin film technology.

PROTECTIVE COATING APPLICATIONS

OVERCOAT

TYPICAL THICKNESS (Å)

APPLICATIONS

Silicone nitride

4000 to 6000

Resistor overcoat with fine trim capability and integrated capacitor

Polyimide

50 000 to 80 000

Resistor overcoat and solder dam

PROTECTIVE COATING GUIDELINES

OVERCOAT

TYPICAL THICKNESS (Å)

MIN. FEATURE SIZE

MIN. METAL OVERLAP

Silicone nitride

4000 to 6000

0.004" x 0.004"

0.002"

± 0.002"

Polyimide

50 000 to 80 000

0.001"

± 0.002"

GLOBAL PART NUMBER INFORMATION

Custom Global Part Number: PSS205687-00N

Custom Global Part Number Description: Specialty Films Custom 205687-00N

P

S

S

2

0568

7

-

00

N

MODEL

CUSTOM PART NUMBER

INTERNAL

REVISION

VARIANT

A = AlN

B = BeO

F = ferrite/

garnet

K = zirconia

N = resistor

conductor

CONTACT INFORMATION