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Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

CMT83085

HopeRF Micro electronics · Isolated RS-485/422 Transceivers · SOIC-16-300mil

CMT83085 from HopeRF Micro electronics, in a SOIC-16-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VDD1	power_in	Isolation side 1 (logic side) supply voltage. Operating range 2.5V to 5.5V. Requires a 0.1µF bypass capacitor to GND1 placed as close to the pin as possible.
2	GND1	power_in	Isolation side 1 ground reference. Must be tied together with pins 7 and 8.
3	R	output	Receiver output. Digital output on the logic side that reflects the RS-485 bus differential input (A-B). Drives the host UART RX line.
4	/RE	input	Receiver enable input, active low. When low, the receiver output R is enabled; when high, R is high-impedance. Has an internal pull-up (IPU ≤ 10µA).
5	DE	input	Driver enable input, active high. When high, the driver outputs A/B are enabled; when low, A/B are high-impedance. Has an internal pull-down (IPD ≈ -10µA).
6	D	input	Driver transmit data input. Digital input on the logic side from the host UART TX line; drives the RS-485 bus outputs A/B when DE is high. Has internal pull-up (IPU ≤ 10µA).
7	GND1	power_in	Isolation side 1 ground reference (tied internally/externally to pin 2).
8	GND1	power_in	Isolation side 1 ground reference (tied internally/externally to pin 2).
9	GND2	power_in	Isolation side 2 (bus side) ground reference. Isolated from GND1 by the on-die isolation barrier.
10	GND2	power_in	Isolation side 2 ground reference (tied together with pins 9 and 15).
11	NC	unconnected	No connect. Leave floating or tie to GND2 for board layout convenience.
12	A	bidirectional	RS-485 bus non-inverting driver output / receiver input. When the driver is disabled or VDD1/VDD2 loses power, A enters a high-impedance state to avoid loading the bus. Absolute-max bus voltage range -7V to +12V.
13	B	bidirectional	RS-485 bus inverting driver output / receiver input. When the driver is disabled or VDD1/VDD2 loses power, B enters a high-impedance state to avoid loading the bus. Absolute-max bus voltage range -7V to +12V.
14	NC	unconnected	No connect. Leave floating or tie to GND2 for board layout convenience.
15	GND2	power_in	Isolation side 2 ground reference (tied together with pins 9 and 10).
16	VDD2	power_in	Isolation side 2 (RS-485 bus side) supply voltage. Operating range 3.0V to 5.5V. Requires a 10µF bypass capacitor to GND2 placed as close to the pin as possible.

Key specifications

Parameter	Value
Manufacturer	HopeRF Micro electronics
Package	SOIC-16-300mil
Category	Signal Isolation Devices
Pins	16

CAD (KiCad official)

Symbol: CMT83085
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16-300mil (KiCad packages3D, STEP)

Provenance

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

Datasheet: HopeRF Micro electronics datasheet (22 pp, sha256 eba3fab9dcb0563f, retrieved 2026-08-17, 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: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF