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MS1285

Public Made by Adom

by adom

Hangzhou Ruimeng Tech RS-485 / RS-422 ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MS1285

Hangzhou Ruimeng Tech · RS-485 / RS-422 ICs · SOIC-8

MS1285 from Hangzhou Ruimeng Tech, in a SOIC-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 that follows the A-B differential input, with VOH of 4.2 V to 4.8 V and VOL of 0.1 V to 0.2 V at IOUT = -1.5 mA and VID = 200 mV, and a short-circuit current limit of 7 mA.
2 RE input Active-low receiver enable; driving RE high puts the receiver output RO into high impedance.
3 DE input Active-high driver enable; driving DE low puts the driver outputs A and B into high impedance.
4 DI input Driver data input with VIH minimum 2 V and VIL maximum 0.8 V, and input current of ±2 µA.
5 GND power_in Ground reference pin for the device.
6 A bidirectional RS-485 bus port A, with receiver common-mode range of -7 V to +12 V and ±20 kV HBM ESD protection.
7 B bidirectional RS-485 bus port B, with receiver common-mode range of -7 V to +12 V and ±20 kV HBM ESD protection.
8 VCC power_in Positive supply with a recommended operating range of 4.5 V to 7 V and an absolute maximum rating of -0.5 V to +8 V.

Key specifications

Parameter Value
Manufacturer Hangzhou Ruimeng Tech
Package SOIC-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
Supply voltage (recommended operating range) VCC 4.5 7 V Working voltage range (features list) 1
Supply voltage (absolute maximum) VCC -0.5 8 V 2
Control input voltage VDE、VRE -0.5 8 V 2
Driver input voltage VDI,IN -0.5 8 V 2
Driver output voltage VA,OUT、VB,OUT -0.5 8 V 2
Receiver input voltage VA,IN、VB,IN -7 12 V 2
Receiver output voltage VRO -0.5 8 V 2
Continuous power dissipation (SOP8 package) PC 470 mW SOP8 package, TA=70℃ 2
Operating temperature range TWORK -40 85 ℃ 2
Storage temperature range TSTORE -60 160 ℃ 2
Soldering temperature TSOLDERING 300 ℃ 5 s 2
Differential driver output voltage, no load VOD 4 V 無負載 (no load), VCC=5V, TA=+25℃ 3
Differential driver output voltage VOD 2 2.5 V RL=50Ω, VCC=5V, TA=+25℃ 3
Change in magnitude of differential output voltage ΔVOD 0.2 V RL=50Ω, VCC=5V, TA=+25℃ 3
Driver common-mode output voltage VOC 3 V RL=50Ω, VCC=5V, TA=+25℃ 3
Change in magnitude of common-mode output voltage ΔVOC 0.2 V RL=50Ω, VCC=5V, TA=+25℃ 3
Input high-level voltage VIH 2 V DE, RE, DI, VCC=5V, TA=+25℃ 3
Input low-level voltage VIL 0.8 V DE, RE, DI, VCC=5V, TA=+25℃ 3
Logic input current IIN,LOGIC -2 2 uA DE, RE, DI, VCC=5V, TA=+25℃ 3
Bus pin input current IIN,BUS 40 90 uA DE=0V, VCC=5V, VIN=5V 3
Bus pin input current IIN,BUS 60 100 uA DE=0V, VCC=5V, VIN=0V 3
Receiver differential threshold voltage VTH -0.1 0.1 V -7V≤VCM≤12V, VCC=5V, TA=+25℃ 3
Receiver output high-level voltage VOH 4.2 4.8 V IOUT=-1.5mA, VID=200mV 3
Receiver output low-level voltage VOL 0.1 0.2 V IOUT=-1.5mA, VID=200mV 3
Receiver tri-state (high-impedance) output current IOSR -1 1 uA VCC=5V, 0V≤VOUT≤VCC 3
Supply current ICC 0.48 0.9 mA No load, RE=DE=DI=0V or VCC 3
Driver output short-circuit current IOSD 25 mA VOUT=-7V 3
Receiver output short-circuit current IOSR 7 mA 0V≤VRO≤VCC 3
A, B pin ESD protection (human body model) VESD -20 20 kV Human Body Model 3
Driver propagation delay, low-to-high tPLH 10 35 70 ns RDIFF=50Ω, CLA=CLB=100pF, VCC=5V, TA=+25℃ 4
Driver propagation delay, high-to-low tPHL 10 50 90 ns RDIFF=50Ω, CLA=CLB=100pF, VCC=5V, TA=+25℃ 4
Driver propagation delay skew tPDS 30 ns RDIFF=50Ω, CLA=CLB=100pF 4
Driver rise time tTTR 40 70 ns RDIFF=50Ω, CLA=CLB=100pF 4
Driver fall time tTTF 40 70 ns RDIFF=50Ω, CLA=CLB=100pF 4
Driver enable to output high delay tPZH 30 70 ns CL=100pF 4
Driver enable to output low delay tPZL 30 70 ns CL=100pF 4
Driver disable from output high delay tPHZ 90 110 ns CL=100pF 4
Driver disable from output low delay tPLZ 100 120 ns CL=100pF 4
Receiver propagation delay, low-to-high tPLH 20 60 200 ns CL=15pF 4
Receiver propagation delay, high-to-low tPHL 20 40 200 ns CL=15pF 4
Receiver propagation delay skew tPDS 20 ns CL=15pF, /tPLH-tPHL/ 4
Receiver enable to output high delay tPZH 50 80 ns CL=15pF 4
Receiver enable to output low delay tPZL 60 90 ns CL=15pF 4
Receiver disable from output high delay tPHZ 50 80 ns CL=15pF 4
Receiver disable from output low delay tPLZ 60 90 ns CL=15pF 4
Maximum data rate fMAX 10 Mbps 4
Receiver input resistance RIN 100 kΩ -7V≤VCM≤12V 3
Receiver differential threshold hysteresis ΔVTH 25 mV VCM=0V 3

CAD (KiCad official)

  • Symbol: MS1285
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: ms1285-etched.step / ms1285-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ms1285.step / ms1285.glb are the bare package body.

Provenance

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

  • Datasheet: Hangzhou Ruimeng Tech datasheet (6 pp, sha256 0670157aa322c501, retrieved 2026-10-17, 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF