component
CBM485AS8
Public Made by Adomby adom
Corebai Microelectronics RS-485 / RS-422 ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
CBM485AS8
Corebai Microelectronics · RS-485 / RS-422 ICs · SOIC-8
CBM485AS8 from Corebai Microelectronics, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RO | output | Receiver output, three-state, driven high when A-B is above the threshold or the inputs are open, with VOH of at least 3.5V at IO = -4mA and VOL of at most 0.4V at IO = 4mA. |
| 2 | RE | input | Receiver output enable, active low (RO is enabled when RE = 0 and high-impedance when RE = 1), with input high threshold of at least 2.0V and input low threshold of at most 0.8V. |
| 3 | DE | input | Driver output enable, active high (driver outputs are enabled when DE = 1 and high-impedance when DE = 0), with input high threshold of at least 2.0V and input low threshold of at most 0.8V. |
| 4 | DI | input | Driver input, where a low on DI with DE high drives the non-inverting output low and the inverting output high, with input voltage limited to -0.5V to VCC+0.5V. |
| 5 | GND | power_in | Ground, the reference for all device voltages. |
| 6 | A | bidirectional | Non-inverting RS-485 receiver input and driver output, rated -8V to +12.5V with common-mode range -7V to +12V. |
| 7 | B | bidirectional | Inverting RS-485 receiver input and driver output, rated -8V to +12.5V with common-mode range -7V to +12V. |
| 8 | VCC | power_in | Positive supply, operating from a single 5V ±5% supply with an absolute maximum of 12V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Corebai Microelectronics |
| Package | SOIC-8 |
| Category | Interface |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage (VCC) | VCC | 12 | V | 2 | |||
| Control Input Voltage | -0.5 | V | Upper limit printed as (VCC + 0.5V), not a fixed number | 2 | |||
| Driver Input Voltage (DI) | -0.5 | V | Upper limit printed as (VCC + 0.5V), not a fixed number | 2 | |||
| Driver Output Voltage (A, B) | -8 | 12.5 | V | 2 | |||
| Receiver Input Voltage (A, B) | -8 | 12.5 | V | 2 | |||
| Receiver Output Voltage (RO) | -0.5 | V | Upper limit printed as (VCC + 0.5V), not a fixed number | 2 | |||
| Operating Temperature Range | TA | -40 | 85 | ℃ | 2 | ||
| Storage Temperature Range | TSTG | -65 | 160 | ℃ | 2 | ||
| Lead Temperature (soldering, 10 sec) | 300 | ℃ | Soldering, 10 sec | 2 | |||
| Continuous Power Dissipation, 8-Pin SOP | PD | 471 | mW | TA = +70℃; derate 5.88 mW/℃ above +70℃ | 2 | ||
| Supply voltage tolerance (test condition) | VCC | -5 | 5 | % | VCC = 5V ±5%, TA = TMIN to TMAX (table header) | 3 | |
| Differential Driver Output (no load) | VOD1 | 5 | V | 3 | |||
| Differential Driver Output (with load, RS-422) | VOD2 | 2 | V | R = 50Ω (RS-422) | 3 | ||
| Differential Driver Output (with load, RS-485) | VOD2 | 1.5 | 5 | V | R = 27Ω (RS-485), Figure 1 | 3 | |
| Change in Magnitude of Driver Differential Output Voltage for Complementary Output States | ∆VOD | 0.2 | V | R = 27Ω or 50Ω, Figure 1 | 3 | ||
| Driver Common-Mode Output Voltage | VOC | 3 | V | R = 27Ω or 50Ω, Figure 1 | 3 | ||
| Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States | ∆VOC | 0.2 | V | R = 27Ω or 50Ω, Figure 1 | 3 | ||
| Input High Voltage | VIH | 2 | V | DE, DI, RE | 3 | ||
| Input Low Voltage | VIL | 0.8 | V | DE, DI, RE | 3 | ||
| Input Current | IIN1 | -2 | 2 | μA | DE, DI, RE | 3 | |
| Input Current (A, B) | IIN2 | 1 | mA | DE = 0V; VCC = 0V or 5.25V; VIN = 12V | 3 | ||
| Input Current (A, B) | IIN2 | -0.8 | mA | DE = 0V; VCC = 0V or 5.25V; VIN = -7V | 3 | ||
| Receiver Differential Threshold Voltage | VTH | -0.2 | 0.2 | V | -7V ≤ VCM ≤ 12V | 3 | |
| Receiver Input Hysteresis | ∆VTH | 70 | mV | VCM = 0V | 3 | ||
| Receiver Output High Voltage | VOH | 3.5 | V | IO = -4mA, VID = 200mV | 3 | ||
| Receiver Output Low Voltage | VOL | 0.4 | V | IO = 4mA, VID = -200mV | 3 | ||
| Three-State (high impedance) Output Current at Receiver | IOZR | -1 | 1 | μA | 0.4V ≤ VO ≤ 2.4V | 3 | |
| Receiver Input Resistance | RIN | 12 | kΩ | -7V ≤ VCM ≤ 12V | 3 | ||
| No-Load Supply Current (Note 3) | ICC | 500 | 900 | μA | DE = VCC | 3 | |
| No-Load Supply Current (Note 3) | ICC | 300 | 500 | μA | RE = 0V or VCC; DE = 0V | 3 | |
| Driver Short-Circuit Current, VO = High | IOSD1 | 35 | 250 | mA | -7V ≤ VO ≤ 12V (Note 4); VO = High | 3 | |
| Driver Short-Circuit Current, VO = Low | IOSD2 | 35 | 250 | mA | -7V ≤ VO ≤ 12V (Note 4); VO = Low | 3 | |
| Receiver Short-Circuit Current | IOSR | 7 | 95 | mA | 0V ≤ VO ≤ VCC | 3 | |
| ESD Protection (Human Body Model) | 15 | kV | A, B, Y and Z pins, tested using Human Body Model | 3 | |||
| Driver Input to Output (tPLH) | tPLH | 10 | 55 | 60 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Driver Input to Output (tPHL) | tPHL | 10 | 55 | 60 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Driver Output Skew to Output | tSKEW | 5 | 10 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 | |
| Driver Enable to Output High | tZH | 40 | 70 | ns | CL = 100pF, S2 closed | 4 | |
| Driver Enable to Output Low | tZL | 40 | 70 | ns | CL = 100pF, S1 closed | 4 | |
| Driver Disable Time from Low | tLZ | 40 | 70 | ns | CL = 15pF, S1 closed | 4 | |
| Driver Disable Time from High | tHZ | 40 | 70 | ns | CL = 15pF, S2 closed | 4 | |
| Receiver Input to Output (tPLH) | tPLH | 20 | 60 | 100 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Receiver Input to Output (tPHL) | tPHL | 20 | 60 | 100 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Differential Receiver Skew | tSKD | 5 | 10 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 | |
| Receiver Enable to Output Low | tZL | 30 | 50 | ns | RL = 15pF, S1 closed | 4 | |
| Receiver Enable to Output High | tZH | 30 | 50 | ns | CRL = 15pF, S2 closed | 4 | |
| Receiver Disable Time from Low | tLZ | 30 | 50 | ns | CRL = 15pF, S1 closed | 4 | |
| Receiver Disable Time from High | tHZ | 30 | 50 | ns | CRL = 15pF, S2 closed | 4 | |
| Maximum Data Rate | fMAX | 2.5 | 10 | 20 | Mbps | 4 |
CAD (KiCad official)
- Symbol:
CBM485AS8 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
cbm485as8-etched.step/cbm485as8-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cbm485as8.step/cbm485as8.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Corebai Microelectronics datasheet (11 pp, sha256
87251a449412e9b0, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).
# CBM485AS8
**Corebai Microelectronics** · RS-485 / RS-422 ICs · SOIC-8
CBM485AS8 from Corebai Microelectronics, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
## Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RO | output | Receiver output, three-state, driven high when A-B is above the threshold or the inputs are open, with VOH of at least 3.5V at IO = -4mA and VOL of at most 0.4V at IO = 4mA. |
| 2 | RE | input | Receiver output enable, active low (RO is enabled when RE = 0 and high-impedance when RE = 1), with input high threshold of at least 2.0V and input low threshold of at most 0.8V. |
| 3 | DE | input | Driver output enable, active high (driver outputs are enabled when DE = 1 and high-impedance when DE = 0), with input high threshold of at least 2.0V and input low threshold of at most 0.8V. |
| 4 | DI | input | Driver input, where a low on DI with DE high drives the non-inverting output low and the inverting output high, with input voltage limited to -0.5V to VCC+0.5V. |
| 5 | GND | power_in | Ground, the reference for all device voltages. |
| 6 | A | bidirectional | Non-inverting RS-485 receiver input and driver output, rated -8V to +12.5V with common-mode range -7V to +12V. |
| 7 | B | bidirectional | Inverting RS-485 receiver input and driver output, rated -8V to +12.5V with common-mode range -7V to +12V. |
| 8 | VCC | power_in | Positive supply, operating from a single 5V ±5% supply with an absolute maximum of 12V. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Corebai Microelectronics |
| Package | SOIC-8 |
| Category | Interface |
| Pins | 8 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage (VCC) | VCC | | | 12 | V | | 2 |
| Control Input Voltage | | -0.5 | | | V | Upper limit printed as (VCC + 0.5V), not a fixed number | 2 |
| Driver Input Voltage (DI) | | -0.5 | | | V | Upper limit printed as (VCC + 0.5V), not a fixed number | 2 |
| Driver Output Voltage (A, B) | | -8 | | 12.5 | V | | 2 |
| Receiver Input Voltage (A, B) | | -8 | | 12.5 | V | | 2 |
| Receiver Output Voltage (RO) | | -0.5 | | | V | Upper limit printed as (VCC + 0.5V), not a fixed number | 2 |
| Operating Temperature Range | TA | -40 | | 85 | ℃ | | 2 |
| Storage Temperature Range | TSTG | -65 | | 160 | ℃ | | 2 |
| Lead Temperature (soldering, 10 sec) | | | | 300 | ℃ | Soldering, 10 sec | 2 |
| Continuous Power Dissipation, 8-Pin SOP | PD | | | 471 | mW | TA = +70℃; derate 5.88 mW/℃ above +70℃ | 2 |
| Supply voltage tolerance (test condition) | VCC | -5 | | 5 | % | VCC = 5V ±5%, TA = TMIN to TMAX (table header) | 3 |
| Differential Driver Output (no load) | VOD1 | | | 5 | V | | 3 |
| Differential Driver Output (with load, RS-422) | VOD2 | 2 | | | V | R = 50Ω (RS-422) | 3 |
| Differential Driver Output (with load, RS-485) | VOD2 | 1.5 | | 5 | V | R = 27Ω (RS-485), Figure 1 | 3 |
| Change in Magnitude of Driver Differential Output Voltage for Complementary Output States | ∆VOD | | | 0.2 | V | R = 27Ω or 50Ω, Figure 1 | 3 |
| Driver Common-Mode Output Voltage | VOC | | | 3 | V | R = 27Ω or 50Ω, Figure 1 | 3 |
| Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States | ∆VOC | | | 0.2 | V | R = 27Ω or 50Ω, Figure 1 | 3 |
| Input High Voltage | VIH | 2 | | | V | DE, DI, RE | 3 |
| Input Low Voltage | VIL | | | 0.8 | V | DE, DI, RE | 3 |
| Input Current | IIN1 | -2 | | 2 | μA | DE, DI, RE | 3 |
| Input Current (A, B) | IIN2 | | | 1 | mA | DE = 0V; VCC = 0V or 5.25V; VIN = 12V | 3 |
| Input Current (A, B) | IIN2 | -0.8 | | | mA | DE = 0V; VCC = 0V or 5.25V; VIN = -7V | 3 |
| Receiver Differential Threshold Voltage | VTH | -0.2 | | 0.2 | V | -7V ≤ VCM ≤ 12V | 3 |
| Receiver Input Hysteresis | ∆VTH | | 70 | | mV | VCM = 0V | 3 |
| Receiver Output High Voltage | VOH | 3.5 | | | V | IO = -4mA, VID = 200mV | 3 |
| Receiver Output Low Voltage | VOL | | | 0.4 | V | IO = 4mA, VID = -200mV | 3 |
| Three-State (high impedance) Output Current at Receiver | IOZR | -1 | | 1 | μA | 0.4V ≤ VO ≤ 2.4V | 3 |
| Receiver Input Resistance | RIN | 12 | | | kΩ | -7V ≤ VCM ≤ 12V | 3 |
| No-Load Supply Current (Note 3) | ICC | | 500 | 900 | μA | DE = VCC | 3 |
| No-Load Supply Current (Note 3) | ICC | | 300 | 500 | μA | RE = 0V or VCC; DE = 0V | 3 |
| Driver Short-Circuit Current, VO = High | IOSD1 | 35 | | 250 | mA | -7V ≤ VO ≤ 12V (Note 4); VO = High | 3 |
| Driver Short-Circuit Current, VO = Low | IOSD2 | 35 | | 250 | mA | -7V ≤ VO ≤ 12V (Note 4); VO = Low | 3 |
| Receiver Short-Circuit Current | IOSR | 7 | | 95 | mA | 0V ≤ VO ≤ VCC | 3 |
| ESD Protection (Human Body Model) | | 15 | | | kV | A, B, Y and Z pins, tested using Human Body Model | 3 |
| Driver Input to Output (tPLH) | tPLH | 10 | 55 | 60 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Driver Input to Output (tPHL) | tPHL | 10 | 55 | 60 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Driver Output Skew to Output | tSKEW | | 5 | 10 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Driver Enable to Output High | tZH | | 40 | 70 | ns | CL = 100pF, S2 closed | 4 |
| Driver Enable to Output Low | tZL | | 40 | 70 | ns | CL = 100pF, S1 closed | 4 |
| Driver Disable Time from Low | tLZ | | 40 | 70 | ns | CL = 15pF, S1 closed | 4 |
| Driver Disable Time from High | tHZ | | 40 | 70 | ns | CL = 15pF, S2 closed | 4 |
| Receiver Input to Output (tPLH) | tPLH | 20 | 60 | 100 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Receiver Input to Output (tPHL) | tPHL | 20 | 60 | 100 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Differential Receiver Skew | tSKD | | 5 | 10 | ns | RDIFF = 54, CL1 = CL2 = 100pF | 4 |
| Receiver Enable to Output Low | tZL | | 30 | 50 | ns | RL = 15pF, S1 closed | 4 |
| Receiver Enable to Output High | tZH | | 30 | 50 | ns | CRL = 15pF, S2 closed | 4 |
| Receiver Disable Time from Low | tLZ | | 30 | 50 | ns | CRL = 15pF, S1 closed | 4 |
| Receiver Disable Time from High | tHZ | | 30 | 50 | ns | CRL = 15pF, S2 closed | 4 |
| Maximum Data Rate | fMAX | 2.5 | 10 | 20 | Mbps | | 4 |
## CAD (KiCad official)
- Symbol: `CBM485AS8`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `cbm485as8-etched.step` / `cbm485as8-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cbm485as8.step` / `cbm485as8.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Corebai Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884873738399744) (11 pp, sha256 `87251a449412e9b0`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).
[Datasheet PDF](docs/cbm485as8-datasheet.pdf)