component

MAX485ESA

Public Unreviewed

by Ray

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

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Contents

README

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MAX485ESA

UMW · RS-485 / RS-422 ICs · SOP-8

MAX485ESA from UMW, in a SOP-8. Pinout and pin descriptions extracted from the datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 RO output Receiver Output. Digital CMOS output of the RS-485 receiver. Logic-high when A-B >= +0.2V, logic-low when A-B <= -0.2V, and high-impedance when RE is high (receiver disabled). VOH >= 3.5V at IO=-4mA, VOL <= 0.4V at IO=4mA.
2 ~RE input Receiver Output Enable, active-low. Drive low to enable receiver (RO active), drive high to place RO into high-impedance state. CMOS logic input referenced to VCC (VIH >= 2V, VIL <= 0.8V, IIN = ±2µA max).
3 DE input Driver Output Enable, active-high. Drive high to enable the RS-485 driver outputs A and B, drive low to place A and B into high-impedance. CMOS logic input (VIH >= 2V, VIL <= 0.8V, IIN = ±2µA max).
4 DI input Driver Input. CMOS logic input carrying the transmit data to be driven onto the RS-485 differential bus. When DE=1: DI=1 forces A=1/B=0, DI=0 forces A=0/B=1. VIH >= 2V, VIL <= 0.8V, IIN = ±2µA max.
5 GND power_in Ground reference for the device. Must be tied to system ground.
6 A bidirectional Non-inverting RS-485/RS-422 differential bus line. Acts as a driver output when DE=1 and as a receiver input when RE is low. Absolute range -8V to +12.5V; common-mode range -7V to +12V; receiver input resistance >= 12kΩ.
7 B bidirectional Inverting RS-485/RS-422 differential bus line. Acts as a driver output when DE=1 and as a receiver input when RE is low. Absolute range -8V to +12.5V; common-mode range -7V to +12V; receiver input resistance >= 12kΩ.
8 VCC power_in Positive supply input, 5V ±5%. No-load supply current typically 500µA (DE=VCC) or 300µA (DE=0, RE tied high or low). Absolute maximum 7V. Bypass to GND with a 0.1µF ceramic close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • MAX485ESA

CAD (KiCad official)

  • Symbol: MAX485ESA
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
max485esa.step 122 KB You want the bare part, or you mark your own boards.
max485esa-etched.step 1.9 MB You want the part with MAX485ESA already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 473 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: UMW datasheet (9 pp, sha256 e4e2116cdfbdf558, 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).

Datasheet PDF