Transcript スライド 1 - Newark element14

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
Trimming: thin film vs. thick film
Micro Cracks
Laser trimming trace
Thin Film Power
Why does thin film has low current noise?
Resistance material of RR
Ni-Cr alloy
Current flow is
practically even
Resistance material of Thick Film
Metal & Insulator composite
Current flow is
not even
Current Noise: thin film vs. thick film
+/-15V PS, Bias Current Noise, 5.5 mAdc
A/rtHz
1.0E-10
1.0E-11
Susumu RR Series
Thick Film
Jameco
Thick film
PS Noise
1.0E-12
100
1000
10000
Frequency (Hz)
100000
High Frequency Performance
Skin effect
Structure: RR vs. RG
Top layer: Epoxy
resin coating
Epoxy resin
coating
(2 layers)
Base layer:
Inorganic
passivation film
Resistor film
Resistor film
RR series
RG series
Process Comparison: RR vs. RG
RR
RG (New)
Sputtering
Sputtering
Electrode & Resistance Forming
Electrode & Resistance Forming
Inorganic
film
formation
process
Cleaning
Coating (Inorganic)
Trimming
Trimming
Cleaning & Coating
Cleaning & Coating
Marking
Marking
Side Electrode Forming
Side Electrode Forming
Inspection
Inspection
YAG laser
trims through
the inorganic
film without
affecting it
Resin coat for
mechanical
protection.
Reliability Specification Comparison
between RG and RR series
Item
RG Series
Condition
Moisture
Load Life
THB: 85oC-85%
1000 hours
Load Life
85oC (rated power)
1000 hours
High
Temperatur
e Exposure
155oC (no load)
1000 hours
Operation at
125oC is
possible
(Derating is needed)
RR Series
Drift
+/-0.1%
Condition
40oC-95%
1000 hours
Drift
+/- 0.5%
+/- 0.1%
70oC ( rated power)
1000 hours
+/- 0.5%
+/- 0.1%
125oC (no load)
1000 hours
+/- 0.5%
Operation at
125oC is not
possible
High Temp. exposure
Comparison with Thick-Film
RG characteristics summary
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•
•
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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