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HT3485EARZ

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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HT3485EARZ

HTCSEMI · RS-485 / RS-422 ICs · SOP-8

HT3485EARZ 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 if A-B ≥ +0.2V or inputs open, low if A-B ≤ -0.2V, high-impedance when RE is high.
2 RE input Receiver output enable, active low; RE low enables RO, RE high puts RO in high impedance (logic thresholds VIH 2.0V min, VIL 0.8V max).
3 DE input Driver output enable, active high; DE high enables the driver outputs A and B, DE low puts them in high impedance (VIH 2.0V min, VIL 0.8V max).
4 DI input Driver input; with DE high a low on DI forces the non-inverting output A low and inverting output B high, and a high on DI does the opposite (VIH 2.0V min, VIL 0.8V max).
5 GND power_in Ground reference for all voltages.
6 A bidirectional Non-inverting receiver input and non-inverting driver output on the RS-485/RS-422 bus, rated -7.5V to +12.5V.
7 B bidirectional Inverting receiver input and inverting 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 operation, absolute maximum 7V.

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
Driver Differential Output (with load), RS-422 load VOD2 1 V R = 100Ω (RS-422) 2
Driver Differential Output (with load), RS-485 load VOD2 0.8 V R = 54Ω (RS-485), Figure 4 2
Change in Magnitude of Driver Differential Output Voltage for Complementary Output States ΔVOD 0.2 V R = 54Ω or 50Ω, Figure 4 2
Driver Common-Mode Output Voltage VOC 2 V R = 54Ω or 100Ω, Figure 4 2
Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States ΔVOC 0.2 V R = 54Ω or 100Ω, 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 3.35V; VIN = -7V 2
Receiver Differential Threshold Voltage VTH -0.2 0.2 V 2
Receiver Input Hysteresis ΔVTH 70 mV VCM = 0V 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
Receiver Input Resistance RIN 12 kΩ 2
No-Load Supply Current ICC 500 800 µA DE = VCC 3
No-Load Supply Current ICC 300 400 µA RE = 0V or VCC; DE = 0V 3
Driver Short-Circuit Current, VO = High IOSD1 250 mA VO = High 3
Driver Short-Circuit Current, VO = Low IOSD2 250 mA VO = Low 3
Receiver Short-Circuit Current IOSR 95 mA 3
ESD Protection (Human Body Model) 15 kV A, B, Y and Z pins, tested using Human Body Model 3
Driver Input to Output tPLH tPLH 10 80 100 ns RDIFF = 54Ω 3
Driver Input to Output tPHL 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 Propagation Delay Skew /tPLH - tPHL/ tSKD 13 20 ns RDIFF = 54Ω 3
Receiver Input to Output tPLH tPLH 20 120 200 ns RDIFF = 54Ω, CL1 = CL2 = 100pF 3
Receiver Input to Output tPHL 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) tolerance about 3.3V VCC -0.3 3.3 0.3 V VCC = 3.3V ±0.3V (test/operating condition) 2
Operating Temperature Range TA -40 85 °C TA = TMIN to TMAX; all packages 1
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 Maximum printed as (VCC+0.3V) 2
Storage Temperature Range TSTG -65 160 °C 2
Lead Temperature (soldering, 10 sec) 300 °C soldering, 10 sec 2
Continuous Power Dissipation (8-Pin SOP) PD 471 mW TA = +70°C; derate 5.88mW/°C above +70°C 2

CAD (KiCad official)

  • Symbol: HT3485EARZ
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: ht3485earz-etched.step / ht3485earz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht3485earz.step / ht3485earz.glb are the bare package body.

Provenance

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

  • Datasheet: HTCSEMI datasheet (8 pp, sha256 5ad1de9a38e2b1fe, 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