BL3085A

@@ -0,0 +1,47 @@+# BL3085A++**BL Shanghai Belling BL3085A H** · RS-485 / RS-422 ICs · SOP-8++BL3085A from BL Shanghai Belling BL3085A H, in a SOP-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. CMOS output driven from the differential A/B receiver comparator. High-Z when the receiver is disabled (/RE=1). VOH >= 4.0V at IO=8mA (5V), VOL <= 0.4V at IO=8mA. |+| 2 | /RE | input | Receiver Output Enable (active low). /RE=0 enables the receiver; /RE=1 disables (RO High-Z). With /RE=1 and DE=0 the device enters shutdown mode (ICC <= 10 uA). |+| 3 | DE | input | Driver Output Enable (active high). DE=1 enables the differential driver on A/B; DE=0 places A/B in High-Z. With /RE=1 and DE=0 the device enters shutdown mode. |+| 4 | DI | input | Driver Input. CMOS logic input driving the differential A/B outputs when DE=1 (DI=1 -> A=high, B=low). Input hysteresis typ. 100 mV; VIH >= 2.0V, VIL <= 0.8V. |+| 5 | GND | power_in | Ground reference for the device. All voltages are referred to this pin. |+| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output (RS-485 bus line A). Withstands +/-13V bus voltage; receiver input resistance >= 96 kOhm (1/8 unit load). Differential threshold VTH between -200 mV and -50 mV. |+| 7 | B | bidirectional | Inverting receiver input and inverting driver output (RS-485 bus line B). Withstands +/-13V bus voltage; +/-15 kV IEC 61000-4-2 contact ESD protection. |+| 8 | VCC | power_in | Power supply input. Operating range +3.0V to +3.6V (3.3V option) or +4.5V to +5.5V (5V option); absolute max +7V. Typical ICC ~350 uA (5V) / ~270 uA (3.3V), shutdown ICC <= 10 uA. Bypass with 0.1 uF to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling BL3085A H |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `BL3085A(H)`++## CAD (KiCad official)++- Symbol: `BL3085A`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [BL Shanghai Belling BL3085A H datasheet](docs/bl3085a-datasheet.pdf) (11 pp, sha256 `c911764fb5bb997a`, 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/bl3085a-datasheet.pdf)

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