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bl8503-40prm
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BL Shanghai Belling Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-3L. Datasheet-verified pinout, KiCad symbol/footprint/3D.
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README.mdadded+46@@ -0,0 +1,46 @@+# BL8503-40PRM++**BL Shanghai Belling** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L++BL8503-40PRM from BL Shanghai Belling, in a SOT-23-3L. 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 | Vss | power_in | Ground reference (0V). Common return for input and output. Connect to system ground with a low-impedance path. |+| 2 | Vout | power_out | Regulated output voltage (4.0V nominal, ±2%) for the -40 option. Delivers up to 250mA. Requires a 1µF output capacitor (tantalum recommended) for loop stability. |+| 3 | Vin | power_in | Supply voltage input, 1.5V to 10V absolute max (recommended max 8V). Requires a 1µF input capacitor (tantalum recommended). For Vout=4.0V, Vin must exceed Vout + dropout (~4.4V @ 250mA). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling |+| Package | SOT-23-3L |+| Category | PMIC |+| Pins | 3 |++## Ordering variants++- `BL8503-40PRM`+- `BL8503-40PRMPSM`+- `BL8503-40PRMPSA`+- `BL8503-40PRMPSB`+- `BL8503-40PRMPT`++## CAD (KiCad official)++- Symbol: `BL8503-40PRM`+- Footprint: `Package_TO_SOT_SMD:SOT-23-3`+- 3D model: SOT-23-3L (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [BL Shanghai Belling datasheet](docs/bl8503-40prm-datasheet.pdf) (None pp, sha256 `8f6684221c2cf4c4`, 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/bl8503-40prm-datasheet.pdf)
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