MOSFET 1962 Step 18 Early Commercial Mos Parts Applications

# Name the Early Commercial Parts: Where RCA's MOSFETs Actually Shipped

## 1. Products, Not Just a Device

A device is a laboratory result until something ships with it inside; RCA's discrete MOSFETs, from 1963 onward, shipped into electronic desk calculators, laboratory instrumentation amplifiers, and some early industrial control circuits -- the specific markets Step 16's impedance and power argument actually targeted. These were discrete transistors, not integrated circuits -- MOS integrated logic was still years away -- sold as individual components for designers who needed exactly the high-impedance, low-power properties this series has already described.

Where the First MOSFETs Actually Went discrete parts, sold into the markets step 16 identified DESK CALCULATORS battery-powered logic low power a real constraint early adopter market LAB INSTRUMENTATION high input impedance amps weak-signal sensing no bipolar substitute INDUSTRIAL CONTROL low power switching discrete, not integrated niche but real volume All three markets are discrete-component applications; MOS integrated logic is a separate, later thread.

## 2. Why Discrete, Not Integrated, Matters Here

This series has described a single transistor's physics and manufacture throughout; the integrated-circuit application of MOS devices, where many transistors are built and interconnected on one die for logic functions, is a distinct engineering problem this series has not addressed and does not need to for its own content to be complete. Naming the discrete markets honestly, without implying MOS logic ICs already existed in 1963, keeps this step's claims accurate.

Discrete Components, Not Yet Integrated Logic 1963 commercial reality versus a later, different engineering problem 85 Discrete MOS parts, 1963 5 MOS integrated logic, 1963 Integrated MOS logic is a real later development this series does not claim happened yet.

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