# HT83485ARZ

**HTCSEMI** · RS-485 / RS-422 ICs · SOP-8

HT83485ARZ 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, three-state; high when A-B ≥ +0.2V or input open, low when A-B ≤ -0.2V, high-impedance when RE is high. |
| 2 | RE | input | Active-low receiver output enable; RE low enables RO, RE high puts RO in high impedance (VIH 2.0V min, VIL 0.8V max). |
| 3 | DE | input | Driver output enable; DE high enables the driver outputs, DE low places them in high impedance (VIH 2.0V min, VIL 0.8V max). |
| 4 | DI | input | Driver input; with DE high, DI low forces the non-inverting output low and DI high forces it high (VIH 2.0V min, VIL 0.8V max). |
| 5 | GND | power_in | Ground reference for all device voltages. |
| 6 | A | bidirectional | Non-inverting receiver input and driver output on the RS-485/RS-422 bus, rated -7.5V to +12.5V. |
| 7 | B | bidirectional | Inverting receiver input and driver output on the RS-485/RS-422 bus, rated -7.5V to +12.5V. |
| 8 | VCC | power_in | Positive supply, 3.3V ±0.3V operating, 7V absolute maximum. |

## 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 |
|---|---|---|---|---|---|---|---|
| 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 3.35V; VIN = -7V | 2 |
| Receiver Differential Threshold Voltage | VTH | -0.2 |  | 0.2 | V | -7V ≤ VCM ≤ +12V | 2 |
| Receiver Output High Voltage | VOH | 2.5 |  |  | V | IO = -1.5mA, VID = 200mV | 2 |
| Receiver Output Low Voltage | VOL |  |  | 0.4 | V | IO = 2.5mA, VID = -200mV | 2 |
| Three-State (high impedance) Output Current at Receiver | IOZR | -1 |  | 1 | µA |  | 2 |
| No-Load Supply Current (Note 3) | ICC |  | 500 | 800 | µA | DE = VCC | 3 |
| No-Load Supply Current (Note 3) | ICC |  | 300 | 400 | µA | RE = 0V or VCC; DE = 0V | 3 |
| ESD Protection (Human Body Model) |  | -15 |  | 15 | kV | A, B, Y and Z pins; Human Body Model | 3 |
| Driver Input to Output (low-to-high) | tPLH | 10 | 80 | 100 | ns | RDIFF = 54Ω | 3 |
| Driver Input to Output (high-to-low) | tPHL | 10 | 80 | 100 | ns | CL1 = CL2 = 100pF | 3 |
| Driver Output Skew to Output | tSKEW |  | 5 | 10 | ns | RDIFF = 54Ω, CL1 = CL2 = 100pF | 3 |
| Driver Enable to Output High | tZH |  | 55 | 80 | ns | CL = 100pF, S2 closed | 3 |
| Driver Enable to Output Low | tZL |  | 55 | 80 | ns | CL = 100pF, S1 closed | 3 |
| Driver Disable Time from Low | tLZ |  | 60 | 90 | ns | CL = 15pF, S1 closed | 3 |
| Driver Disable Time from High | tHZ |  | 60 | 90 | ns | CL = 15pF, S2 closed | 3 |
| Differential Driver Skew /tPLH - tPHL/ | tSKD |  | 13 | 20 | ns | RDIFF = 54Ω | 3 |
| Receiver Input to Output (low-to-high) | tPLH | 20 | 120 | 200 | ns | RDIFF = 54Ω, CL1 = CL2 = 100pF | 3 |
| Receiver Input to Output (high-to-low) | tPHL | 20 | 120 | 200 | ns |  | 3 |
| Receiver Skew /tPLH - tPHL/ |  |  | 5 | 10 | ns | CL1 = CL2 = 100pF | 3 |
| Receiver Enable to Output Low | tZL |  | 50 | 90 | ns | CRL = 15pF, S1 closed | 3 |
| Receiver Enable to Output High | tZH |  | 50 | 90 | ns | CRL = 15pF, S2 closed | 3 |
| Receiver Disable Time from Low | tLZ |  | 40 | 80 | ns | CRL = 15pF, S1 closed | 3 |
| Receiver Disable Time from High | tHZ |  | 40 | 80 | ns | CRL = 15pF, S2 closed | 3 |
| Maximum Data Rate | fMAX | 2.5 | 5 | 10 | Mbps |  | 3 |
| Supply Voltage VCC (3.3 V nominal, ±0.3 V tolerance) | VCC | -0.3 | 3.3 | 0.3 | V | VCC = 3.3V ±0.3V, TA = TMIN to TMAX | 2 |
| Supply Voltage (VCC) | VCC |  |  | 7 | V |  | 2 |
| Control Input Voltage |  | -0.3 |  | 7 | V |  | 2 |
| Driver Input Voltage (DI) |  | -0.3 |  | 7 | V |  | 2 |
| Driver Output Voltage (A, B) |  | -7.5 |  | 12.5 | V |  | 2 |
| Receiver Input Voltage (A, B) |  | -7.5 |  | 12.5 | V |  | 2 |
| Receiver Output Voltage (RO) |  | -0.3 |  |  | V | max = VCC + 0.3V | 2 |
| Operating Temperature Range |  | -40 |  | 85 | °C |  | 2 |
| Storage Temperature Range |  | -65 |  | 160 | °C |  | 2 |
| Lead Temperature (soldering) |  |  |  | 300 | °C | soldering, 10 sec | 2 |
| Continuous Power Dissipation (8-Pin SOP) |  |  |  | 471 | mW | TA = +70°C; derate 5.88mW/°C above +70°C | 2 |

## CAD (KiCad official)

- Symbol: `HT83485ARZ`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `ht83485arz-etched.step` / `ht83485arz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht83485arz.step` / `ht83485arz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HTCSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590221688227848192) (8 pp, sha256 `a9c210de7b8b172f`, 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](docs/ht83485arz-datasheet.pdf)