# TRSF3223EIRGWR

**Texas Instruments** · RS232 ICs · VQFN-20(5x5)

TRSF3223EIRGWR from Texas Instruments, in a VQFN-20(5x5). 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 | C1+ | passive | Positive terminal of charge-pump capacitor C1. |
| 2 | C1- | passive | Negative terminal of charge-pump capacitor C1. |
| 3 | C2+ | passive | Positive terminal of charge-pump capacitor C2. |
| 4 | C2- | passive | Negative terminal of charge-pump capacitor C2. |
| 5 | V- | power_out | Negative charge-pump output supply, bypassed with a capacitor; absolute maximum is -7 V. |
| 6 | DOUT2 | output | RS-232 driver 2 output, ±15 kV HBM ESD protected, with output swing of at least ±5 V into 3 kΩ. |
| 7 | RIN2 | input | RS-232 receiver 2 input, ±25 V input range, ±15 kV HBM ESD protected, with 3 kΩ to 5 kΩ input resistance. |
| 8 | ROUT2 | output | Logic-level receiver 2 output, high-impedance when EN is high. |
| 9 | INVALID | output | Valid-signal output that is high when any receiver input is beyond ±2.7 V and low when all receiver inputs stay within ±0.3 V for more than 30 µs. |
| 10 | DIN2 | input | Logic input for driver 2, accepting up to 5.5 V. |
| 11 | DIN1 | input | Logic input for driver 1, accepting up to 5.5 V. |
| 12 | FORCEON | input | Logic input that, when high with FORCEOFF high, disables auto-powerdown; low enables auto-powerdown when FORCEOFF is high. |
| 13 | ROUT1 | output | Logic-level receiver 1 output, high-impedance when EN is high. |
| 14 | RIN1 | input | RS-232 receiver 1 input, ±25 V input range, ±15 kV HBM ESD protected, with 3 kΩ to 5 kΩ input resistance. |
| 15 | DOUT1 | output | RS-232 driver 1 output, ±15 kV HBM ESD protected, with output swing of at least ±5 V into 3 kΩ. |
| 16 | GND | power_in | Ground; ±15 kV HBM ESD protected relative to the RS-232 pins. |
| 17 | VCC | power_in | Supply voltage of 3 V to 5.5 V, with 3.3 V ±0.3 V or 5 V ±0.5 V operating ranges; absolute maximum 6 V. |
| 18 | FORCEOFF | input | Active-low logic input that powers off drivers and charge pump when low, reducing supply current to about 1 µA. |
| 19 | EN | input | Active-low receiver enable input that places the receiver outputs in high impedance when high. |
| 20 | V+ | power_out | Positive charge-pump output supply, bypassed with a capacitor; absolute maximum is 7 V. |
| 21 | EP | passive | Exposed thermal pad that must be soldered to the PCB for optimal thermal and mechanical performance; the datasheet does not state its electrical connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-20(5x5) |
| Category | Interface |
| Pins | 21 |

## CAD (KiCad official)

- Symbol: `TRSF3223EIRGWR`
- Footprint: `Package_DFN_QFN:QFN-20-1EP_5x5mm_P0.65mm_EP3.35x3.35mm`
- 3D model: VQFN-20(5x5) (KiCad packages3D, STEP)
- 3D model files: `trsf3223eirgwr-etched.step` / `trsf3223eirgwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `trsf3223eirgwr.step` / `trsf3223eirgwr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/trsf3223e) (31 pp, sha256 `12937657b0efb4a1`, retrieved 2026-10-08, 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+vision), consensus `claude-opus-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/trsf3223eirgwr-datasheet.pdf)