# CA-IF4820HM

**Chipanalog** · RS-485 / RS-422 ICs · MSOP-8

CA-IF4820HM from Chipanalog, in a MSOP-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; high when (VA - VB) > -20mV, low when (VA - VB) < -200mV, or high-impedance when REB is high. |
| 2 | REB | input | Receiver enable control, active low; receiver enabled when low, output high-impedance when high. |
| 3 | DE | input | Driver enable control, active high; driver enabled when high, outputs high-impedance when low. |
| 4 | DI | input | Driver data input; when DE is high, DI high drives A high and B low, DI low drives A low and B high. |
| 5 | GND | power_in | Ground; reference for all signal levels and bus common mode. |
| 6 | A | bidirectional | RS-485/RS-422 differential bus non-inverting side; ±30V overvoltage protection, ±30kV HBM ESD protection. |
| 7 | B | bidirectional | RS-485/RS-422 differential bus inverting side; ±30V overvoltage protection, ±30kV HBM ESD protection. |
| 8 | VCC | power_in | Power supply input, 3.0V to 5.5V; bypass with ≥0.1μF capacitor placed close to pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Chipanalog |
| Package | MSOP-8 |
| Category | Interface |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `CA-IF4820HM`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `ca-if4820hm-etched.step` / `ca-if4820hm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ca-if4820hm.step` / `ca-if4820hm.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Chipanalog datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590913701527056384) (24 pp, sha256 `2bf29538f533f541`, retrieved 2026-09-18, 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:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/ca-if4820hm-datasheet.pdf)