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CM3085E

Public Made by Adom

by adom

coileasy RS-485 / RS-422 ICs, SOP-8-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CM3085E

coileasy · RS-485 / RS-422 ICs · SOP-8-150mil

CM3085E from coileasy, in a SOP-8-150mil. 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: with RE low, RO is high when A-B is at or above -50 mV and low when A-B is at or below -200 mV.
2 RE input Receiver output enable, active low: RE low enables RO, RE high puts RO in high impedance, and RE high with DE low selects low-power mode.
3 DE input Driver output enable: DE high enables the A/B outputs, DE low puts A/B in high impedance, and RE high with DE low selects low-power mode.
4 DI input Driver input: DI high drives A high and B low, DI low drives A low and B high; the logic input high threshold is 2.0 V minimum and the low threshold is 0.8 V maximum.
5 GND power_in Ground reference for the device.
6 A bidirectional Receiver non-inverting input and driver non-inverting output; bus voltage rated -8 V to 13 V.
7 B bidirectional Receiver inverting input and driver inverting output; bus voltage rated -8 V to 13 V.
8 VCC power_in Supply voltage: recommended 3.0 V to 5.5 V, absolute maximum 7 V with respect to GND.

Key specifications

Parameter Value
Manufacturer coileasy
Package SOP-8-150mil
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 VCC -0.3 7 V 3
Logic input/output voltage (DE, RE, DI, RO) -0.3 V max printed as VCC+0.3 V 3
Bus input/output voltage (A, B) -8 13 V 3
Logic output current (RO) -10 10 mA 3
Continuous power dissipation SOP8 471 mW 3
Operating temperature range (ambient) -40 85 °C 3
Storage temperature Tstg -65 150 °C 3
Soldering temperature 300 °C 3
ESD HBM, bus pins A/B -15 15 kV Human body model, bus pins A/B 3
ESD MM, bus pins A/B -800 800 V Machine model, bus pins A/B 3
ESD IEC 61000-4-2 contact discharge, bus pins A/B -12 12 kV Contact discharge 3
ESD IEC 61000-4-2 air discharge, bus pins A/B -15 15 kV Air discharge 3
ESD HBM, other pins -6 6 kV Human body model, other pins 3
ESD MM, other pins -400 400 V Machine model, other pins 3
Supply voltage VCC 3 5.5 V 4
Data rate DR 0 500 kbps 4
Ambient temperature TA -40 85 °C 4
Supply input voltage VCC 3 5 5.5 V 4
Differential driver output voltage (no load) VOD1 1.5 V No load; max printed as VCC 4
Differential driver output voltage (RS-422) VOD2 2 V R=50 Ω (RS-422), Fig. B1; max printed as VCC 4
Differential driver output voltage (RS-485) VOD2 1.5 V R=27 Ω (RS-485), Fig. B1 4
Differential output voltage magnitude symmetry ΔVOD 200 mV R=50 Ω or R=27 Ω 4
Driver common-mode output voltage VOC 1 3 V 4
Common-mode output voltage magnitude symmetry ΔVOC 200 mV 4
Logic input high voltage VIH1 2 V DE, RE, DI 4
Logic input low voltage VIL1 0.8 V 4
Bus input current (receive mode), positive IIN 125 µA Receive mode, DE=GND, VCC=GND / 5.25V, VA,VB=12V 4
Bus input current (receive mode), negative IIN -75 µA Receive mode, DE=GND, VCC=GND / 5.25V, VA,VB=-7V 4
Driver short-circuit output current IOSD -250 mA -7 V ≤ VOUT ≤ VCC 4
Driver short-circuit output current IOSD 250 mA 0 V ≤ VOUT ≤ 12 V 4
Driver short-circuit output current IOSD -25 25 mA 0 V ≤ VOUT ≤ VCC 4
Differential threshold voltage VTH -200 -110 -50 mV -7 V ≤ VOUT ≤ 12 V (VCC=5.0 V); -7 V ≤ VOUT ≤ 6 V (VCC=3.3 V) 4
Receiver output low voltage VOL 0.4 V IO=4 mA, VID<-200 mV 5
High-impedance output current (RO) IOZR -1 1 µA 0.4 V ≤ VO ≤ 2.4 V 5
Receiver output short-circuit current IOSR -7 95 mA 0 V ≤ VRO ≤ VCC 5
Static supply current (transmit mode, no load) ICC 150 600 µA No load; RE=DI=VCC, DE=VCC 5
Static supply current (receive mode, no load) ICC 120 600 µA No load; RE=DI=GND, DE=GND 5
Low-power shutdown current ISHDN 0.1 10 µA DE=GND, RE=VCC, DI=VCC or GND 5
Maximum data rate DRMAX 500 kbps 5
Driver propagation delay, low-to-high tDLH 250 720 900 ns RDIFF=54 Ω, CL1=CL2=100 pF, Fig. B2 5
Driver propagation delay, high-to-low tDHL 200 530 750 ns RDIFF=54 Ω, CL1=CL2=100 pF, Fig. B2 5
Driver pulse width distortion tDPWD 3 100 ns /tDLH - tDHL/ 5
Driver enable to output high tDZH 2.5 µs CL=100 pF, S2 closed, Fig. B5 5
Driver enable to output low tDZL 2.5 µs CL=100 pF, S1 closed, Fig. B5 5
Driver output high to high-impedance tDHZ 100 ns CL=15 pF, S2 closed, Fig. B5 5
Driver output low to high-impedance tDLZ 100 ns CL=15 pF, S1 closed, Fig. B5 5
Driver enable from low-power mode to output high tDZH(SHDN) 4.5 µs CL=15 pF, S2 closed, Fig. B5 5
Receiver propagation delay, low-to-high tRLH 127 200 ns /VID/ ≥ 2.0 V, Fig. B3 6
Receiver pulse width distortion tRPWD 3 30 ns /tRLH - tRHL/ 6
Receiver enable to output low tRZL 20 50 ns CL=100 pF, S1 closed, Fig. B4 6
Receiver enable to output high tRZH 20 50 ns CL=100 pF, S2 closed, Fig. B4 6
Receiver enable from low-power mode to output high tRZH(SHDN) 3.5 µs CL=100 pF, S2 closed, Fig. B4 6
Low-power mode time (enable to low-power transition) tSHDN 50 200 600 ns 6

CAD (KiCad official)

  • Symbol: CM3085E
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8-150mil (KiCad packages3D, STEP)
  • 3D model files: cm3085e-etched.step / cm3085e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cm3085e.step / cm3085e.glb are the bare package body.

Provenance

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

  • Datasheet: coileasy datasheet (14 pp, sha256 141883afbcd18333, 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