# TD522D485H-A

**YLPTEC** · RS485 Bus Modules · DIP-12

TD522D485H-A from YLPTEC, in a DIP-12. 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 | VCC | power_in | Positive power supply input; TD522D485H-A requires 4.75~5.25 VDC (5 V nominal) and has no reverse-polarity protection. |
| 2 | GND | power_in | Power supply input ground. |
| 3 | TXD1 | input | Channel 1 transmit data input (5 V UART level for TD522D485H-A, VIH min 0.7VCC, VIL max 0.3VCC, with 10 kΩ pull-up). |
| 4 | RXD1 | output | Channel 1 receive data output (5 V UART level, VOL max 0.4 V and VOH min VCC-0.4 V at IRXD=4 mA). |
| 5 | TXD2 | input | Channel 2 transmit data input (5 V UART level for TD522D485H-A, VIH min 0.7VCC, VIL max 0.3VCC, with 10 kΩ pull-up). |
| 6 | RXD2 | output | Channel 2 receive data output (5 V UART level, VOL max 0.4 V and VOH min VCC-0.4 V at IRXD=4 mA). |
| 7 | A2 | bidirectional | RS-485 channel 2 A bus line, isolated from channel 1 with built-in pull resistor and ESD protection. |
| 8 | B2 | bidirectional | RS-485 channel 2 B bus line, isolated from channel 1 with built-in pull resistor and ESD protection. |
| 9 | G2 | passive | Isolated power output ground for channel 2 (RS-485 side); leave floating if unused. |
| 10 | A1 | bidirectional | RS-485 channel 1 A bus line, isolated from channel 2 with built-in pull resistor and ESD protection. |
| 11 | B1 | bidirectional | RS-485 channel 1 B bus line, isolated from channel 2 with built-in pull resistor and ESD protection. |
| 12 | G1 | passive | Isolated power output ground for channel 1 (RS-485 side); leave floating if unused. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TD522D485H-A`
- Footprint: `Package_DIP:DIP-12_W7.62mm`
- 3D model: DIP-12 (KiCad packages3D, STEP)
- 3D model files: `td522d485h-a-etched.step` / `td522d485h-a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `td522d485h-a.step` / `td522d485h-a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YLPTEC datasheet](docs/td522d485h-a-datasheet.pdf) (5 pp, sha256 `e28d45acbfdca7ad`, retrieved 2026-10-23, 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-sonnet-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](docs/td522d485h-a-datasheet.pdf)