BL3085N

@@ -0,0 +1,50 @@+# BL3085N++**BL Shanghai Belling** · RS-485 / RS-422 ICs · SOIC-8++BL3085N from BL Shanghai Belling, in a SOIC-8. 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 | RO | output | Receiver output. Drives the recovered logic-level data from the A/B bus differential pair; enters High-Z when /RE is high. |+| 2 | /RE | input | Active-low receiver output enable. When /RE is low the receiver output RO is active; when /RE is high RO is High-Z. With /RE=high and DE=low the device enters shutdown mode. |+| 3 | DE | input | Driver output enable (active high). When DE is high the differential driver A/B outputs are enabled; when DE is low the driver outputs are High-Z. |+| 4 | DI | input | Driver input. TTL/CMOS logic input whose state drives the differential A/B bus outputs when DE is asserted. Input hysteresis is 100 mV typ. |+| 5 | GND | power_in | Device ground reference (0 V). |+| 6 | A | bidirectional | RS-485 differential bus pin A. Non-inverting receiver input and non-inverting driver output in the default polarity state; internal polarity-correction circuit may swap the A/B role after the 80 ms polarity-detection window. Absolute-max input range -7 V to +12 V; ±15 kV IEC 61000-4-2 contact-discharge ESD protected. |+| 7 | B | bidirectional | RS-485 differential bus pin B. Inverting receiver input and inverting driver output in the default polarity state; internal polarity-correction circuit may swap the A/B role after the 80 ms polarity-detection window. Absolute-max input range -7 V to +12 V; ±15 kV IEC 61000-4-2 contact-discharge ESD protected. |+| 8 | VCC | power_in | Positive supply, +5 V nominal (4.5 V to 5.5 V operating). Absolute maximum +7 V. Recommend a local 0.1 µF decoupling capacitor to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling |+| Package | SOIC-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `BL3085NI56`++## CAD (KiCad official)++- Symbol: `BL3085N`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [BL Shanghai Belling datasheet](docs/bl3085n-datasheet.pdf) (9 pp, sha256 `f13f3d0e939aad3d`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/bl3085n-datasheet.pdf)

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