Introduction

Purpose• To introduce and familiarize Susumu thin film chip resistors

Objectives• Basic difference between thin film and thick film resistors• Understanding thin film register characteristics• Introducing Sususmu’s two types of resistors: RR (precision)

and RG (high precision & reliable)

Content• 14 pages

Learning time• 10 minutes

Thin film vs thick film

• Thin film• Metal thin film

deposited in molecular/atomic process

• Thickness: nm• Better performance

• Thick film• Metal powder resin

composite screen printed

• Thickness: um• Generally considered

more reliable

Characteristics of thin film

• Accurate

• Low TCR

• Low noise

• Better high frequency performance

Micro Cracks

Laser trimming traceThin Film Power

Trimming: thin film vs. thick film

Resistance material of RR Resistance material of Thick Film

Ni-Cr alloy Metal & Insulator composite

Current flow is practically even not even

Current flow is

Why does thin film has low current noise?

Current Noise: thin film vs. thick film

+/-15V PS, Bias Current Noise, 5.5 mAdc

1.0E-12

1.0E-11

1.0E-10

100 1000 10000 100000

Frequency (Hz)

A/r

tHz

Susumu RR Series

Jameco Thick Film

PS NoiseThick film

High Frequency PerformanceSkin effect

Structure: RR vs. RG

Resistor film

Epoxy resin coating

(2 layers)

RG seriesRG seriesRR seriesRR series

Resistor film

Base layer:Inorganic

passivation film

Top layer: Epoxy resin coating

Sputtering

Electrode & Resistance Forming

Trimming

Cleaning & Coating

Marking

Side Electrode Forming

RG (New)RG (New)RRRR

Inspection

Sputtering

Electrode & Resistance Forming

Cleaning

Trimming

Coating (Inorganic)

Marking

Side Electrode Forming

Inspection

Cleaning & Coating

YAG laser trims through the inorganic film without affecting it

Resin coat for mechanical protection.

Inorganic film

formation process

Process Comparison: RR vs. RG

Reliability Specification Comparison between RG and RR series

ItemRG Series RR Series

Condition Drift Condition Drift

Moisture Load Life

THB: 85oC-85%1000 hours

+/-0.1%40oC-95%

1000 hours+/- 0.5%

Load Life85oC (rated power)

1000 hours+/- 0.1%

70oC ( rated power)

1000 hours+/- 0.5%

High Temperature Exposure

155oC (no load)

1000 hours+/- 0.1%

125oC (no load)

1000 hours+/- 0.5%

Operation at 125oC is possible(Derating is needed)

Operation at 125oC is not

possible

High Temp. exposureComparison with Thick-Film

RG characteristics summary

• Inorganic passivation

• Trimming through passivation

• Resistance tolerance : 0.02%

• TCR 5ppm

• Operating temp: 155oC

• Extremely reliable: 0.011fit by accelerated tests.

RM: chip resistor network with RG

•2 standard types

•Matching tolerance as low as 0.01%

•Matching TCR as low as +/- 1ppm

•Custom package available

Summary

• Thin Film Advantage: Accuracy, Low TCR, Low noise, frequency performance

• Regular RR series and high precision/highly reliable RG series

• RG series extremely reliable• Precision network (RM series) available