BL1551B

@@ -0,0 +1,45 @@+# BL1551B++**BL Shanghai Belling** · Analog Switches, Multiplexers · SC-70-6++BL1551B from BL Shanghai Belling, in a SC-70-6. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | A1 | bidirectional | Analog switch throw terminal 1. Bidirectional data port; connected to common terminal B when ENB is HIGH. Signal range 0V to VCC; RON ~2.7Ω at VCC=5V. |+| 2 | GND | power_in | Ground return for the device. |+| 3 | A2 | bidirectional | Analog switch throw terminal 2. Bidirectional data port; connected to common terminal B when ENB is LOW. Signal range 0V to VCC; RON ~2.7Ω at VCC=5V. |+| 4 | B | bidirectional | Analog switch common (pole) terminal. Bidirectional data port routed to either A1 or A2 under control of ENB. Signal range 0V to VCC. |+| 5 | VCC | power_in | Positive supply input, 1.8V to 5.5V operating range (6V absolute max). Bypass with a 0.1µF capacitor to GND. |+| 6 | ENB | input | Digital logic control input selecting the switch position. ENB=HIGH connects A1 to B; ENB=LOW connects A2 to B. TTL/CMOS compatible (VIH ≥ 1.5V, VIL ≤ 0.6V at VCC=5V). Must not be left floating. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling |+| Package | SC-70-6 |+| Category | Interface |+| Pins | 6 |++## Ordering variants++- `BL1551B`++## CAD (KiCad official)++- Symbol: `BL1551B`+- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`+- 3D model: SC-70-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [BL Shanghai Belling datasheet](docs/bl1551b-datasheet.pdf) (10 pp, sha256 `e066dbc07f7b36a0`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/bl1551b-datasheet.pdf)

@@ -0,0 +1,34 @@+{+  "slug": "bl1551b",+  "version": "0.1.0",+  "type": "component",+  "description": "BL Shanghai Belling Analog Switches, Multiplexers, SC-70-6. Datasheet-verified pinout, KiCad symbol/footprint/3D.",+  "tags": [+    "component",+    "interface",+    "bl1551b"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "bl1551b.kicad_sym",+    "bl1551b.kicad_mod",+    "bl1551b.glb",+    "bl1551b.step",+    "bl1551b.lbr",+    "docs/hero.png",+    "docs/bl1551b-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file