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HT485ARZ

Public Made by Adom

by adom

HTCSEMI RS-485 / RS-422 ICs, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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HT485ARZ

HTCSEMI · RS-485 / RS-422 ICs · SOP-8

HT485ARZ from HTCSEMI, 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 output, high when A-B is at least +0.2V or the inputs are open, three-stated when RE is high, with VOH of 3.5V min at IO = -4mA.
2 RE input Active-low receiver output enable; low enables RO and high puts RO in high impedance, with VIH 2.0V min and VIL 0.8V max.
3 DE input Driver output enable; high enables the driver outputs and low places them in high impedance, with VIH 2.0V min and VIL 0.8V max.
4 DI input Driver input; a low on DI forces the non-inverting output low and a high forces it high, with input range -0.5V to (VCC+0.5V).
5 GND power_in Ground reference for all device voltages.
6 A bidirectional Receiver input and driver output on the RS-485 bus, rated -8V to +12.5V with a -7V to +12V common-mode input range.
7 B bidirectional Receiver input and driver output on the RS-485 bus, rated -8V to +12.5V with a -7V to +12V common-mode input range.
8 VCC power_in Single 5V supply (5V ±5% operating), absolute maximum 12V.

Key specifications

Parameter Value
Manufacturer HTCSEMI
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
Receiver Input Hysteresis ΔVTH 70 mV VCM = 0V 2
Differential Driver Output (with load) R = 27Ω (RS-485) VOD2 1.5 5 V R = 27Ω (RS-485), Figure 4 2
Differential Driver Output (with load) R = 50Ω (RS-422) VOD2 2 V R = 50Ω (RS-422) 2
Differential Driver Output (no load) VOD1 5 V no load 2
Change in Magnitude of Driver Differential Output Voltage for Complementary Output States ΔVOD 0.2 V R = 27Ω or 50Ω, Figure 4 2
Driver Common-Mode Output Voltage VOC 3 V R = 27Ω or 50Ω, Figure 4 2
Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States ΔVOC 0.2 V R = 27Ω or 50Ω, Figure 4 2
Input High Voltage VIH 2 V DE, DI, RE 2
Input Low Voltage VIL 0.8 V DE, DI, RE 2
Input Current IIN1 -2 2 µA DE, DI, RE 2
Input Current (A, B) IIN2 1 mA DE = 0V; VIN = 12V 2
Input Current (A, B) IIN2 -0.8 mA VCC = 0V or 5.25V, VIN = -7V 2
Receiver Differential Threshold Voltage VTH -0.2 0.2 V -7V ≤ VCM ≤12V 2
Receiver Output High Voltage VOH 3.5 V IO = -4mA, VID = 200mV 2
Receiver Output Low Voltage VOL 0.4 V IO = 4mA, VID = -200mV 2
Three-State (high impedance) Output Current at Receiver IOZR -1 1 µA 0.4V ≤ VO ≤ 2.4V 2
No-Load Supply Current ICC 500 900 µA DE = VCC 2
No-Load Supply Current ICC 300 500 µA RE = 0V or VCC; DE = 0V 2
Driver Short-Circuit Current, VO = High IOSD1 35 250 mA -7V ≤ VO ≤ 12V (Note 4) 2
Driver Short-Circuit Current, VO = Low IOSD2 35 250 mA -7V ≤ VO ≤12V (Note 4) 2
Receiver Short-Circuit Current IOSR 7 95 mA 0V ≤ VO ≤ VCC 2
Driver Input to Output (tPLH) tPLH 10 30 60 ns RDIFF = 54, CL1 = CL2 = 100pF 3
Driver Input to Output (tPHL) tPHL 10 30 60 ns RDIFF = 54, CL1 = CL2 = 100pF 3
Driver Output Skew to Output tSKEW 5 10 ns RDIFF = 54, CL1 = CL2 = 100pF 3
Driver Enable to Output High tZH 40 70 ns CL= 100pF, S2 closed 3
Driver Enable to Output Low tZL 40 70 ns CL= 100pF, S1 closed 3
Driver Disable Time from Low tLZ 40 70 ns CL= 15pF, S1 closed 3
Driver Disable Time from High tHZ 40 70 ns CL= 15pF, S2 closed 3
Differential Receiver Skew /tPLH - tPHL/ tSKD 13 ns RDIFF = 54, CL1 = CL2 = 100pF 3
Receiver Enable to Output Low tZL 20 50 ns CRL = 15pF, S1 closed 3
Receiver Enable to Output High tZH 20 50 ns CRL = 15pF, S2 closed 3
Receiver Disable Time from Low tLZ 20 50 ns CRL = 15pF, S1 closed 3
Receiver Disable Time from High tHZ 20 50 ns CRL = 15pF, S2 closed 3
Maximum Data Rate fMAX 2.5 Mbps 3
Supply Voltage (VCC) VCC 12 V 1
Control Input Voltage -0.5 V upper limit printed as (VCC + 0.5V) 1
Driver Input Voltage (DI) -0.5 V upper limit printed as (VCC + 0.5V) 1
Driver Output Voltage (A, B) -8 12.5 V 1
Receiver Input Voltage (A, B) -8 12.5 V 1
Receiver Output Voltage (RO) -0.5 V upper limit printed as (VCC+0.5V) 1
Continuous Power Dissipation 471 mW 8-Pin SO (derate 5.88mW/°C) 1
Lead Temperature (soldering, 10 sec) 300 °C soldering, 10 sec 1
Storage Temperature Range TSTG -65 160 °C 1
Operating Temperature Range TA -40 85 °C 1
Supply Voltage (VCC) nominal VCC 5 V VCC = 5V ±5%, TA = TMIN to TMAX 2
Supply Voltage (VCC) tolerance VCC -5 5 % VCC = 5V ±5% 2

CAD (KiCad official)

  • Symbol: HT485ARZ
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: ht485arz-etched.step / ht485arz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht485arz.step / ht485arz.glb are the bare package body.

Provenance

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

  • Datasheet: HTCSEMI datasheet (5 pp, sha256 ab9c6d8b780031f2, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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).

Datasheet PDF