component

RSM3485IDHT

Public Made by Adom

by adom

YLPTEC RS485 Bus Modules, DIP-12. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentiot-communication modulesrsm3485idht
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.

Symbol & Footprint

Schematic Symbol

Open full view ↗
Loads on click. Unloads only if this page sits in the background.

PCB Footprint

Open full view ↗
Loads on click. Unloads only if this page sits in the background.

Datasheet

Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.
Download PDF
Contents

README

markdown

RSM3485IDHT

YLPTEC · RS485 Bus Modules · DIP-12

RSM3485IDHT from YLPTEC, in a DIP-12. 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 VCC power_in Positive supply input. 3.3V nominal (3.15-3.45V range) for RSM3485IDHT. Absolute maximum -0.7V to 5V. Typical quiescent current 38mA, max operating current 200mA. No reverse-polarity protection - do not reverse VCC/GND.
2 GND power_in Power supply return / logic ground for the MCU-side (primary) domain. Isolated from the two RS-485 output grounds G1/G2 (2500VDC isolation).
3 TXD1 input UART transmit input for RS-485 channel 1. Logic level referenced to VCC: VIH >= 0.7*VCC, VIL <= 0.3*VCC. Internal 10kΩ pull-up to VCC. Drive current 2mA. Data drives the A1/B1 differential outputs (TXD=1 -> A1=1, B1=0).
4 RXD1 output UART receive output for RS-485 channel 1. Logic level referenced to VCC: VOH >= VCC-0.4V @ 4mA source, VOL <= 0.4V @ 4mA sink. Max output current 10mA. Reflects A1-B1 differential (>=+200mV -> 1, <=-200mV -> 0).
5 TXD2 input UART transmit input for RS-485 channel 2. Same logic-level characteristics as TXD1 (VIH >= 0.7VCC, VIL <= 0.3VCC, 10kΩ internal pull-up, 2mA drive). Drives the A2/B2 differential outputs. (Datasheet description reads '发送脚 1' - labelled as channel 2 by pin name.)
6 RXD2 output UART receive output for RS-485 channel 2. Same logic-level characteristics as RXD1 (VOH >= VCC-0.4V, VOL <= 0.4V, 10mA max). Reflects A2-B2 differential.
7 A2 bidirectional RS-485 channel 2 non-inverting differential I/O (bus A). Includes integrated ~4.7kΩ pull-up bias, ESD protection, and 48kΩ input impedance (-7V to +12V common mode). Differential output
8 B2 bidirectional RS-485 channel 2 inverting differential I/O (bus B). Integrated ~4.7kΩ pull-down bias and ESD protection. Companion to A2 for the isolated RS-485 channel 2 bus.
9 G2 power_out Isolated power/return ground for RS-485 channel 2 bus (secondary side of channel 2). Isolated 2500VDC from the primary GND and from G1. Datasheet §8.3 notes this pin may be left floating if not used.
10 A1 bidirectional RS-485 channel 1 non-inverting differential I/O (bus A). Includes integrated ~4.7kΩ pull-up bias, ESD protection, and 48kΩ input impedance (-7V to +12V common mode). Differential output
11 B1 bidirectional RS-485 channel 1 inverting differential I/O (bus B). Integrated ~4.7kΩ pull-down bias and ESD protection. Companion to A1 for the isolated RS-485 channel 1 bus.
12 G1 power_out Isolated power/return ground for RS-485 channel 1 bus (secondary side of channel 1). Isolated 2500VDC from the primary GND and from G2. Per §8.3 may be left floating if not used.

Key specifications

Parameter Value
Manufacturer YLPTEC
Package DIP-12
Category IoT/Communication Modules
Pins 12

Ordering variants

Same part, different packaging or reel option.

  • RSM3485IDHT
  • RSM3485IDHTRSM485IDHT

CAD (KiCad official)

  • Symbol: RSM3485IDHT
  • Footprint: Package_DIP:DIP-12_W7.62mm
  • 3D model: DIP-12 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: YLPTEC datasheet (5 pp, sha256 b9d475bdedf3013c, 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