CA-IF4820FS from Chipanalog, 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	VCC	power_in	Supply voltage input, 3.0 V to 5.5 V. Requires at least a 0.1 µF decoupling capacitor between VCC and GND placed close to the pin.
2	RO	output	Receiver digital output. RO = high when (VA - VB) > VTH+; RO = low when (VA - VB) < VTH-. CMOS logic, VOH ≥ VCC-0.4 V at -4 mA, VOL ≤ 0.4 V at 4 mA.
3	DI	input	Driver data input. When DI is high, Y outputs high and Z outputs low; when DI is low, Y outputs low and Z outputs high. CMOS logic input.
4	GND	power_in	Ground reference for the device.
5	Y	output	RS-485/RS-422 driver non-inverting differential output. Absolute max bus voltage ±30 V, common-mode operating range -7 V to +12 V.
6	Z	output	RS-485/RS-422 driver inverting differential output. Absolute max bus voltage ±30 V, common-mode operating range -7 V to +12 V.
7	B	input	RS-485/RS-422 receiver inverting differential input. Absolute max bus voltage ±30 V, common-mode operating range -7 V to +12 V.
8	A	input	RS-485/RS-422 receiver non-inverting differential input. Absolute max bus voltage ±30 V, common-mode operating range -7 V to +12 V.

Key specifications

Parameter	Value
Manufacturer	Chipanalog
Package	SOIC-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

CA-IF4820FS
CA-IF4820FSFM
CA-IF4820FSFD

CAD (KiCad official)

Symbol: CA-IF4820FS
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: Chipanalog datasheet (24 pp, sha256 2bf29538f533f541, 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