component
MS721
Public Made by Adomby adom
Hangzhou Ruimeng Tech Interface - Specialized, SOP-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.
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.
README
markdownMS721
Hangzhou Ruimeng Tech · Interface - Specialized · SOP-16
MS721 from Hangzhou Ruimeng Tech, in a SOP-16. 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 | BUSL2 | bidirectional | M-Bus interface port 2, part of ±50V differential pair for modulated half-duplex UART communication in both receive (voltage modulation detection) and transmit (current modulation) modes. |
| 2 | VB | power_in | Rectified bus voltage input from internal bridge rectifier providing DC voltage to internal reference circuits with minimum 9.3V in receive mode. |
| 3 | STC | passive | Supply storage capacitor connection port for 3.3V internal regulator, operating voltage range 3.8V to 6.4V with external capacitor CSTC. |
| 4 | RIDD | passive | External current-setting resistor connection (13kΩ to 80kΩ) that determines supply charging current ISTC for storage capacitor. |
| 5 | PF | output | Power failure signal output; outputs high (VBAT-0.6V to VBAT) when VVST > VSTC+0.6V indicating power good, low when power fails to alert MCU. |
| 6 | SC | passive | Sampling capacitor connection port for dynamic reference level circuit with external capacitor CSC charged at 40× discharge rate ratio (ISCcharge/ISCdischarge = 40). |
| 7 | TXI | output | Inverted UART data output from receive comparator TC3 with voltage levels 0V to 1.5V (low) or VBAT-0.6V to VBAT (high). |
| 8 | TX | output | UART data output from receive comparator TC3 decoded from M-Bus voltage modulation with voltage levels 0V to 1.5V (low) or VBAT-0.6V to VBAT (high). |
| 9 | BAT | power_in | Battery or auxiliary supply voltage input for logic level adjustment, operating range 2.5V to 3.8V recommended or -0.3V to 5.5V absolute maximum. |
| 10 | VS | power_in | Power source selection output synchronized with VDD; outputs VSTC-0.4V when powered from bus or high-impedance (0.3MΩ to 1MΩ) when battery powered to control external switching transistor. |
| 11 | VDD | power_out | Regulated 3.3V power supply output from internal voltage regulator with output voltage 3.1V to 3.4V at 1mA load and 5Ω output impedance. |
| 12 | RX | input | UART data input from microcontroller for slave-to-master transmission, accepts 0V to 0.8V (logic low) or VBAT-0.8V to 5.5V (logic high) levels. |
| 13 | RXI | input | Inverted UART data input from microcontroller for half-duplex M-Bus communication, accepts 0V to 0.8V (logic low) or VBAT-0.8V to 5.5V (logic high) with ECHO feedback to TX/TXI. |
| 14 | RIS | passive | External current-setting resistor connection (100Ω to 1000Ω typical) that determines transmission current source CS3 modulation current IMC of 11.5mA to 19.5mA. |
| 15 | GND | power_in | Ground reference port providing 0V reference point for all voltage measurements and internal circuit return path. |
| 16 | BUSL1 | bidirectional | M-Bus interface port 1, part of ±50V differential pair for modulated half-duplex UART communication in both receive (voltage modulation detection) and transmit (current modulation) modes. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Hangzhou Ruimeng Tech |
| Package | SOP-16 |
| Category | Interface |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
MS721 - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOP-16 (KiCad packages3D, STEP)
- 3D model files:
ms721-etched.step/ms721-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ms721.step/ms721.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Hangzhou Ruimeng Tech datasheet (13 pp, sha256
6e4072a947be3631, retrieved 2026-09-22, 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 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).