component
HT485ARZ
Public Made by Adomby adom
HTCSEMI 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
markdownHT485ARZ
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ht485arz.step/ht485arz.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).