component
cbm3485as8
Public Unreviewedby Ray
Corebai Microelectronics RS-485 / RS-422 ICs, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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markdownCBM3485AS8
Corebai Microelectronics · RS-485 / RS-422 ICs · SOIC-8
CBM3485AS8 from Corebai Microelectronics, 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 logic-high (VOH ≥ 2.5V at IO = -1.5mA) when A-B > +0.2V, logic-low (VOL ≤ 0.4V at IO = 2.5mA) when A-B < -0.2V. High-impedance when RE is high; guaranteed logic-high when the differential input is open (fail-safe). |
| 2 | RE | input | Receiver output enable, active-low. When low the receiver output RO is enabled; when high RO is placed into a high-impedance (three-state) condition. VIH ≥ 2.0V, VIL ≤ 0.8V; input current ±2µA. |
| 3 | DE | input | Driver output enable, active-high. When high the differential driver outputs A and B are enabled; when low the outputs are placed into a high-impedance state. VIH ≥ 2.0V, VIL ≤ 0.8V; input current ±2µA. |
| 4 | DI | input | Driver input. TTL/CMOS-compatible logic input transmitted onto the differential bus (A, B) when DE is asserted. VIH ≥ 2.0V, VIL ≤ 0.8V; input current ±2µA. DI = 1 drives A high / B low; DI = 0 drives A low / B high. |
| 5 | GND | power_in | Ground / device 0V reference. All voltages are referenced to this pin. |
| 6 | A | bidirectional | Non-inverting differential bus I/O. Driver non-inverting output when DE is high; receiver non-inverting input when RE is low. Common-mode range -7V to +12V; input resistance 12kΩ min; receiver differential threshold ±0.2V. ±15kV IEC61000-4-2 air / ±8kV contact ESD on bus pins. |
| 7 | B | bidirectional | Inverting differential bus I/O. Driver inverting output when DE is high; receiver inverting input when RE is low. Common-mode range -7V to +12V; input resistance 12kΩ min; receiver differential threshold ±0.2V. ±15kV IEC61000-4-2 air / ±8kV contact ESD on bus pins. |
| 8 | VCC | power_in | Positive supply, single 3.3V nominal (3.0V to 3.6V operating). No-load supply current 300µA typ (500µA typ with DE = VCC). Absolute maximum 7V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Corebai Microelectronics |
| Package | SOIC-8 |
| Category | Interface |
| Pins | 8 |
Ordering variants
CBM3485AS8CBM3485AS8ACS
CAD (KiCad official)
- Symbol:
CBM3485AS8 - 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: Corebai Microelectronics datasheet (None pp, sha256
6707251207fe6199, 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).