Micrologic 1960 Step 14 Competitive Landscape Ti Rca

# Compete Against a Hybrid, Not Just a Rival Chip: What Texas Instruments and RCA Bet on Instead

## 1. Why the Real Competitor Was a Different Definition of Integrated Circuit

This step places Micrologic against the actual competitive field it shipped into in 1960, where the loudest prior claim to an integrated circuit, Texas Instruments' demonstration built around Kilby's germanium approach, used fine gold wires to connect separate active and passive elements on one slice rather than a single continuous silicon process, and RCA pursued thin-film and hybrid approaches of its own rather than committing to a fully monolithic planar flow. Fairchild's bet, carried through every step of this series, was that a single silicon chip, diffused once and interconnected by evaporated metal rather than hand-wired, would reach commercial volume and reliability faster than any hybrid approach could — a bet this series' own flat-pack qualification under Step 9 and classification under Step 10 had already proven correct for Fairchild's own production line before this step ever needed to say so out loud.

$$\text{hybrid cost} \sim n_{\text{wires}} \cdot c_{\text{wire bond}}, \qquad \text{monolithic cost} \sim \text{wafer cost} / N_{\text{good}}$$

where $n_{\text{wires}}$ is the number of manual or semi-manual interconnections a hybrid approach needs per unit, $c_{\text{wire bond}}$ the cost of each one, and the monolithic side instead inherits Step 13's exponential yield cost — two cost structures that scale with completely different variables, which is why neither side's engineers, in 1960, agreed on which one would win.

Three Companies, Three Different Bets, 1960 what each one actually shipped, not what each one claimed first FAIRCHILD monolithic planar silicon one diffusion, evaporated metal interconnect this series TEXAS INSTRUMENTS germanium, hand-wired fine gold wires connect separate elements on one slice RCA thin film and hybrid separate active and passive elements on one substrate only one of these three paths matches the cost model Step 13 just derived

## 2. Real Diagram: Counting Manual Connections Instead of Diffused Nodes

A hybrid or hand-wired approach adds a connection cost that scales with the number of separate elements on a slice; this series' monolithic interconnect, patterned once by Step 5's single metal layer, adds no comparable per-connection labor cost at all, no matter how many nodes the circuit needs.

Wire Bonds Versus One Patterned Metal Layer connection cost that scales with node count, against connection cost that does not HAND-WIRED HYBRID each line is a manual bond, each one costs labor PATTERNED METAL, THIS SERIES one masked etch defines every node cost is fixed per wafer, not per connection labor scales with the left panel; silicon process cost does not scale with the right

## 3. Why Fairchild's Commercial Availability, Not Just Its Technology, Decided the Argument

Texas Instruments demonstrated an integrated function earlier than Fairchild did, and that priority is well documented elsewhere in this project's broader history; what this step adds is that priority alone did not determine which approach reached volume production, reliable military qualification, and a published catalog price first. A hand-wired hybrid inherits a connection-labor cost that does not fall as volume rises the way Step 13's wafer-cost model does, and RCA's thin-film route carried a comparable dependence on manual or semi-manual assembly. Fairchild's willingness to commit fully to the planar monolithic flow this entire series has documented step by step is what let it reach the commercial availability Step 10 already classified, ahead of either rival's own hybrid production line.

The competitive argument this step documents was never only about who proved the idea first; it was about which cost structure, hand-wired or monolithic, actually fell as the industry tried to make more of it — and this series exists because Fairchild answered that question correctly before its competitors did.

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