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Introduction

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

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Introduction

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  1. 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

  2. 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 Thin film vs thick film

  3. Characteristics of thin film • Accurate • Low TCR • Low noise • Better high frequency performance

  4. Trimming: thin film vs. thick film Micro Cracks Laser trimming trace Thin Film Power

  5. Current flow is practically even Current flow is not even Why does thin film has low current noise? Resistance material of RR Resistance material of Thick Film Ni-Cr alloy Metal & Insulator composite

  6. Current Noise: thin film vs. thick film Thick film

  7. High Frequency PerformanceSkin effect

  8. 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

  9. Process Comparison: RR vs. RG RG (New) RR Inorganic film formation process Sputtering Sputtering Electrode & Resistance Forming Electrode & Resistance Forming Cleaning Coating (Inorganic) YAG laser trims through the inorganic film without affecting it Trimming Trimming Cleaning & Coating Cleaning & Coating Marking Marking Side Electrode Forming Side Electrode Forming Resin coat for mechanical protection. Inspection Inspection

  10. Reliability Specification Comparison between RG and RR series

  11. High Temp. exposure Comparison with Thick-Film

  12. RG characteristics summary • Inorganic passivation • Trimming through passivation • Resistance tolerance : 0.02% • TCR 5ppm • Operating temp: 155oC • Extremely reliable: 0.011fit by accelerated tests.

  13. 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

  14. 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

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