component

GB490H

Public Unreviewed

by Ray

GEC RS-485 / RS-422 ICs, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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GB490H

GEC · RS-485 / RS-422 ICs · SOP-8

GB490H from GEC, 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 VCC power_in Positive supply, 3.0 V to 5.25 V (3.3 V/5 V nominal). Bypass to GND with a 0.1 µF ceramic capacitor. Quiescent supply current ICC ≈ 0.35 mA typ, 1 mA max.
2 RO output Receiver output (CMOS). Drives high when V(A)-V(B) ≥ -50 mV and low when V(A)-V(B) ≤ -200 mV. Fail-safe: outputs high when receiver inputs are open or shorted. VOH ≥ VCC-0.6 V at -4 mA; VOL ≤ 0.4 V at 4 mA.
3 DI input Driver input (CMOS logic). DI=high forces Y high and Z low; DI=low forces Y low and Z high. VIH ≥ 2.0 V, VIL ≤ 0.8 V, 100 mV hysteresis, ±1 µA input leakage.
4 GND power_in Device ground reference. All voltages are referenced to this pin.
5 Y output RS-422/RS-485 differential bus non-inverting driver output. Follows DI (Y=DI). Supports ±15 kV HBM and ±12 kV IEC 61000-4-2 contact-discharge ESD. Absolute bus voltage rating -8 V to +13 V.
6 Z output RS-422/RS-485 differential bus inverting driver output. Complement of Y (Z = /DI). Supports ±15 kV HBM and ±12 kV IEC 61000-4-2 contact-discharge ESD. Absolute bus voltage rating -8 V to +13 V.
7 B input RS-422/RS-485 differential bus receiver inverting input. Input impedance 96 kΩ min (1/8 unit load), allowing up to 256 nodes on the bus. Common-mode range -7 V to +12 V. Supports ±15 kV HBM ESD.
8 A input RS-422/RS-485 differential bus receiver non-inverting input. Input impedance 96 kΩ min (1/8 unit load). Common-mode range -7 V to +12 V. Receiver threshold VTH = -200 mV to -50 mV. Supports ±15 kV HBM ESD.

Key specifications

Parameter Value
Manufacturer GEC
Package SOP-8
Category Interface
Pins 8

CAD (KiCad official)

  • Symbol: GB490H
  • 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: GEC datasheet (9 pp, sha256 79b49ce9d1da54d4, 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