# 📐 L2 Spec — BSIM Compact MOSFET Model Mismatch-Only Spec
**ID:** `L2-492-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-492`](/artifact/l1/L1-492)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554143
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| T k | — | 200 – 400 |
| L nm | nm | 5 – 1000 |
| W nm | nm | 20 – 10000 |
| Vds range v | — | 0.5 – 3.3 |
| Vgs range v | — | 0.5 – 3.3 |
| N bias points | — | 50 – 10000 |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.018 + 0.001*(Vds_range_V-1.0) + 0.002*abs(T_K-300)/10
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`d19dfa50d78571efb7d0fbef1d90791dfc19c446c751bd7818e5df82a89affbf`
## 5. On-chain Registration
- **Chain hash:** `0xadcaea9f2fbcfc81434019355b3a1bd0c974c8a93d7cdb94e928fa2eecfb4d56`
- **Chain tx hash:** `0xe370c69e62a87f7f507a81c0695d9da6cca7ff37034f8606cea5066492422531`
- **Chain block:** `41554143`
---
## File Mapping
This bundle consists of: `L2-492-001.md`, `L2-492-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-492-001.md` | Source of truth — edit this | Human or LLM |
| `L2-492-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-492-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._