component
HX3485-S
Public Made by Adomby adom
ZHHXDZ RS-485 / RS-422 ICs, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownHX3485-S
ZHHXDZ · RS-485 / RS-422 ICs · SOP-8
HX3485-S from ZHHXDZ, in a SOP-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 data output: when the receiver is enabled (RE low), RO goes high if V(A)-V(B) > -50mV and goes low if V(A)-V(B) < -200mV. |
| 2 | RE | input | Receiver output enable, active low: RE low enables RO, RE high disables the receiver, and RE high with DE low puts the chip into low-power shutdown. |
| 3 | DE | input | Driver output enable: DE high enables the driver outputs, and DE low disables the driver and places its outputs in high impedance. |
| 4 | DI | input | Driver data input: DI low forces A low and B high, and DI high forces A high and B low. |
| 5 | GND | power_in | Ground reference for the device; all voltages are referenced to this pin. |
| 6 | A | bidirectional | Bus terminal A (non-inverting): driver differential output and receiver non-inverting input, tied to the RS-485/RS-422 bus. |
| 7 | B | bidirectional | Bus terminal B (inverting): driver differential output and receiver inverting input, tied to the RS-485/RS-422 bus; ESD protected to ±15kV HBM. |
| 8 | Vcc | power_in | Supply pin for 3.3V or 5V operation; the absolute maximum rating is 3.0V to +6.0V per the datasheet limits table. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ZHHXDZ |
| Package | SOP-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 |
|---|---|---|---|---|---|---|---|
| Logic input high voltage (DE, DI, RE) | VIH1 | 2 | V | DE,DI, RE | 2 | ||
| Logic input low voltage (DE, DI, RE) | VIL1 | 0.8 | V | DE,DI, RE | 2 | ||
| Receiver differential input threshold voltage | VTH | -200 | -50 | mV | -7V≤VCM≤+12V | 2 | |
| Receiver input resistance | RIN | 96 | KΩ | -7V≤VCM≤+12V | 2 | ||
| Receiver output low voltage | VOL | 0.4 | V | IO=4mA,VID=-1V | 2 | ||
| Receiver output tri-state leakage current | IOZR | -1 | 1 | uA | 0.4V≤VO≤2.4V | 2 | |
| Receiver output short-circuit current | IOSR | 7 | 95 | mA | 0V≤VRO≤VCC | 2 | |
| Differential output voltage change (DI change) | ΔVOD | 0.2 | V | R=50Ω or R=27Ω, 图 1 | 2 | ||
| Receiver differential propagation delay skew | tRSKD | -50 | 10 | 50 | ns | VID 上升下降时间小于 15ns 图7,9 | 2 |
| Chip shutdown time | tSHDN | 50 | 200 | 600 | ns | 2 | |
| Receiver enable to output low | tRZL | 20 | 120 | ns | CL=100pF,S1 关断 图 2,8 | 2 | |
| Receiver enable to output high | tRZH | 20 | 120 | ns | CL=100pF,S2 关断 图 2,8 | 2 | |
| Receiver output high to disable | tRHZ | 20 | 120 | ns | CL=100pF,S1 关断 图 2,8 | 2 | |
| Receiver output low to disable | tRLZ | 20 | 120 | ns | CL=100pF,S2 关断 图 2,8 | 2 | |
| Driver enable to output high from shutdown | tDZH(SHDN) | 4500 | ns | CL=15pF,S2 关断 图 4,6 | 2 | ||
| Driver enable to output low from shutdown | tDZL(SHDN) | 4500 | ns | CL=15pF,S1 关断 图 4,6 | 2 | ||
| Receiver enable to output high from shutdown | tRZH(SHDN) | 3500 | ns | CL=100pF,S2 关断 图 2,8 | 2 | ||
| Receiver enable to output low from shutdown | tRZL(SHDN) | 3500 | ns | CL=100pF,S1 关断 图 2,8 | 2 | ||
| Maximum data rate | fMAX | 500 | kbps | 2 | |||
| Supply voltage | VCC | 3 | 6 | V | 2 | ||
| Control input voltage (DE, RE) | DE，RE | -0.3 | 6 | V | 2 | ||
| Driver input voltage (DI) | DI | -0.3 | 6 | V | 2 | ||
| Driver output / receiver input voltage (A, B) | A,B | -8 | 13 | V | 2 | ||
| Storage temperature range | TSTG | -65 | 150 | ℃ | 2 | ||
| Operating temperature range | TOP | -40 | 125 | ℃ | 2 | ||
| Power dissipation (SOP-8) | PD | 471 | mW | SOP-8, above +70℃ | 2 | ||
| Soldering temperature | TL | 300 | ℃ | 10 s | 2 |
CAD (KiCad official)
- Symbol:
HX3485-S - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
hx3485-s-etched.step/hx3485-s-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);hx3485-s.step/hx3485-s.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ZHHXDZ datasheet (5 pp, sha256
55843297878d4f9e, retrieved 2026-10-20, 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 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).