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You can refer to the following table.
| Ball Dia. | Reduction | Land Pattern Density Level | Land Dia. | Land Variation |
| 0.15 | 15% | C | 0.13 | 0.15-0.10 |
| 0.20 | 15% | C | 0.17 | 0.20-0.14 |
| 0.25 | 20% | B | 0.20 | 0.20-0.17 |
| 0.30 | 20% | B | 0.25 | 0.25-0.20 |
| 0.35 | 20% | B | 0.30 | 0.35-0.25 |
| 0.55 | 25% | A | 0.40 | 0.45-0.35 |
続きを読む: BGAPCBアセンブリ
#PCB設計
FR4による水分の吸着は非常に低いですが、, それを最小限に抑える、または完全に排除する最善の方法は何ですか?
私はプロジェクト調達担当です. 最近, 私たちのプロジェクトはテレビを開発することです. あらゆる材料供給のうち、, PCB が最も遅かった. そして、当社のエンジニアもPCBサプライヤーとの話し合いに参加して、彼らを後押ししました。. RF PCBを作るのは本当に難しいですか??
携帯電話のマザーボードから小さな表面実装ボタンのはんだを取り除きたい. 周囲には同様に小さな部品がたくさんあるので、はんだごての熱で損傷したくない. これらのコンポーネントを保護するためにカプトンテープの代わりにアルミホイルを使用できますか??
