component
ST3222BTR
Public Made by Adomby adom
STMicroelectronics RS232 ICs, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownST3222BTR
STMicroelectronics · RS232 ICs · TSSOP-20
ST3222BTR from STMicroelectronics, in a TSSOP-20. 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 | EN | input | Receiver enable control; drive low for normal operation, drive high to force receiver outputs into high-impedance state. |
| 2 | C1+ | passive | Positive terminal for the first charge pump capacitor. |
| 3 | V+ | power_out | Doubled voltage terminal, generates 5.5 V from charge pump. |
| 4 | C1- | passive | Negative terminal for the first charge pump capacitor. |
| 5 | C2+ | passive | Positive terminal for the second charge pump capacitor. |
| 6 | C2- | passive | Negative terminal for the second charge pump capacitor. |
| 7 | V- | power_out | Inverted voltage terminal, generates -5.5 V from charge pump. |
| 8 | T2OUT | output | Second transmitter output voltage, RS-232 level. |
| 9 | R2IN | input | Second receiver input voltage, RS-232 level, operating range ±25 V. |
| 10 | R2OUT | output | Second receiver output voltage, TTL/CMOS level. |
| 11 | NC | unconnected | Not connected. |
| 12 | T2IN | input | Second transmitter input voltage, TTL/CMOS level. |
| 13 | T1IN | input | First transmitter input voltage, TTL/CMOS level. |
| 14 | NC | unconnected | Not connected. |
| 15 | R1OUT | output | First receiver output voltage, TTL/CMOS level. |
| 16 | R1IN | input | First receiver input voltage, RS-232 level, operating range ±25 V. |
| 17 | T1OUT | output | First transmitter output voltage, RS-232 level. |
| 18 | GND | power_in | Ground, power return. |
| 19 | VCC | power_in | Supply voltage, 3.0 to 3.6 V operating range. |
| 20 | SHDN | input | Active low shutdown control input; drive low to shutdown transmitter and charge pump. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TSSOP-20 |
| Category | Interface |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
ST3222BTR - Footprint:
Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm - 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files:
st3222btr-etched.step/st3222btr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);st3222btr.step/st3222btr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (13 pp, sha256
d2375af88fae22b0, retrieved 2026-09-24, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).