component
TRS3221EIRGTR
Public Made by Adomby adom
Texas Instruments RS232 ICs, VQFN-16(3x3). 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
markdownTRS3221EIRGTR
Texas Instruments · RS232 ICs · VQFN-16(3x3)
TRS3221EIRGTR from Texas Instruments, in a VQFN-16(3x3). 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 | Negative terminal of the voltage-doubler charge-pump capacitor C1. |
| 2 | C2+ | passive | Positive terminal of the voltage-doubler charge-pump capacitor C2. |
| 3 | C2- | passive | Negative terminal of the voltage-doubler charge-pump capacitor C2. |
| 4 | V- | power_out | -5.5V supply generated by the charge pump. |
| 5 | RIN | input | RS-232 receiver input. |
| 6 | ROUT | output | Receiver output, set to high impedance when EN is high. |
| 7 | INVALID | output | Invalid output pin; output is low when all RIN inputs are unpowered. |
| 8 | DIN | input | Driver input. |
| 9 | FORCEON | input | Automatic power-down control input. |
| 10 | DOUT | output | RS-232 driver output. |
| 11 | GND | power_in | Ground. |
| 12 | VCC | power_in | 3V to 5.5V supply voltage. |
| 13 | FORCEOFF | input | Automatic power-down control input. |
| 14 | EN | input | Low input enables the ROUT output; high input sets ROUT to high impedance. |
| 15 | V+ | power_out | 5.5V supply generated by the charge pump. |
| 16 | C1+ | passive | Positive terminal of the voltage-doubler charge-pump capacitor C1. |
| 17 | Thermal Pad | passive | Exposed thermal pad that can be connected to GND or left floating. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-16(3x3) |
| Category | Communication Interface Chip |
| Pins | 17 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage range | VCC | -0.3 | 6 | V | 5 | ||
| Positive output supply voltage range | V+ | -0.3 | 7 | V | 5 | ||
| Supply voltage difference | V+, V- | 13 | V | 5 | |||
| Input voltage range, logic | VI | -0.3 | 6 | V | DIN, FORCEOFF, FORCEON, EN | 5 | |
| Input voltage range, RIN | VI | -25 | 25 | V | RIN | 5 | |
| Output voltage range, DOUT | VO | -13.2 | 13.2 | V | DOUT | 5 | |
| Operating virtual junction temperature | TJ | 150 | °C | 5 | |||
| Storage temperature range | Tstg | -65 | 150 | °C | 5 | ||
| Supply voltage | VCC | 3 | 3.3 | 3.6 | V | VCC = 3.3 V | 6 |
| Supply voltage | VCC | 4.5 | 5 | 5.5 | V | VCC = 5 V | 6 |
| High-level input voltage | VIH | 2 | V | VCC = 3.3 V; DIN, FORCEOFF, FORCEON, EN | 6 | ||
| High-level input voltage | VIH | 2.4 | V | VCC = 5 V; DIN, FORCEOFF, FORCEON, EN | 6 | ||
| Low-level input voltage | VIL | 0.8 | V | DIN, FORCEOFF, FORCEON, EN | 6 | ||
| Driver and control input voltage | VI | 0 | 5.5 | V | DIN, FORCEOFF, FORCEON | 6 | |
| Receiver input voltage | VI | -25 | 25 | V | 6 | ||
| Operating free-air temperature | TA | -40 | 85 | °C | TRS3221EI | 6 | |
| Junction-to-ambient thermal resistance | RθJA | 52.1 | °C/W | RGT (VQFN) | 6 | ||
| Junction-to-case (top) thermal resistance | RθJC(top) | 60.6 | °C/W | RGT (VQFN) | 6 | ||
| Junction-to-board thermal resistance | RθJB | 26.8 | °C/W | RGT (VQFN) | 6 | ||
| Junction-to-case (bottom) thermal resistance | RθJC(bot) | 12 | °C/W | RGT (VQFN) | 6 | ||
| Input leakage current | II | 0.01 | 1 | μA | FORCEOFF, FORCEON, EN (typ ±0.01, max ±1) | 6 | |
| Supply current, auto-powerdown disabled | ICC | 0.3 | 1 | mA | VCC = 3.3 V or 5 V, TA = 25°C, No load, FORCEOFF and FORCEON at VCC | 6 | |
| Supply current, powered off | ICC | 1 | 10 | μA | No load, FORCEOFF at GND | 6 | |
| Supply current, auto-powerdown enabled | ICC | 1 | 10 | μA | No load, FORCEOFF at VCC, FORCEON at GND, All RIN are open or grounded | 6 | |
| Driver high-level output voltage | VOH | 5 | 5.4 | V | DOUT at RL = 3 kΩ to GND, DIN = GND | 7 | |
| Driver low-level output voltage | VOL | -5 | -5.4 | V | DOUT at RL = 3 kΩ to GND, DIN = VCC | 7 | |
| Driver high-level input current | IIH | 0.01 | 1 | μA | VI = VCC (typ ±0.01, max ±1) | 7 | |
| Driver low-level input current | IIL | 0.01 | 1 | μA | VI = GND (typ ±0.01, max ±1) | 7 | |
| Short-circuit output current | IOS | 35 | 60 | mA | VCC = 3.6 V, VO = 0 V (typ ±35, max ±60) | 7 | |
| Output resistance | ro | 300 | Ω | VCC, V+, and V- = 0 V, VO = ±2 V; second value printed 10M | 7 | ||
| Driver output leakage current | Ioff | 25 | μA | FORCEOFF = GND, VO = ±12 V, VCC = 3 V to 3.6 V (±25) | 7 | ||
| Maximum data rate | 250 | 500 | kbit/s | CL = 1000 pF, RL = 3 kΩ, RGT package | 7 | ||
| Pulse skew, driver | tsk(p) | 50 | ns | CL = 1000 pF, RL = 3 kΩ, RGT package | 7 | ||
| Slew rate, transition region | SR(tr) | 6 | 30 | V/μs | VCC = 3.3 V, RL = 3 kΩ to 7 kΩ, CL = 150 pF to 1000 pF | 7 | |
| Slew rate, transition region | SR(tr) | 4 | 30 | V/μs | VCC = 3.3 V, RL = 3 kΩ to 7 kΩ, CL = 150 pF to 2500 pF | 7 | |
| Receiver low-level output voltage | VOL | 0.4 | V | IOL = 1.6 mA | 8 | ||
| Receiver positive-going input threshold | VIT+ | 1.6 | 2.4 | V | VCC = 3.3 V | 8 | |
| Receiver positive-going input threshold | VIT+ | 1.9 | 2.4 | V | VCC = 5 V | 8 | |
| Receiver negative-going input threshold | VIT- | 0.6 | 1.1 | V | VCC = 3.3 V | 8 | |
| Receiver negative-going input threshold | VIT- | 0.8 | 1.4 | V | VCC = 5 V | 8 | |
| Input hysteresis | Vhys | 0.5 | V | VIT+, VIT- | 8 | ||
| Receiver output leakage current | Ioff | 0.05 | 10 | μA | EN = VCC (typ ±0.05, max ±10) | 8 | |
| Receiver input resistance | ri | 3 | 5 | 7 | kΩ | VI = ±3 V to ±25 V | 8 |
| INVALID high threshold (positive) | VT+(valid) | 2.7 | V | FORCEON = GND, FORCEOFF = VCC | 9 | ||
| INVALID high threshold (negative) | VT-(valid) | -2.7 | V | FORCEON = GND, FORCEOFF = VCC | 9 | ||
| INVALID low threshold | VT(invalid) | -0.3 | 0.3 | V | FORCEON = GND, FORCEOFF = VCC | 9 | |
| INVALID low-level output voltage | VOL | 0.4 | V | IOL = 1.6 mA, FORCEON = GND, FORCEOFF = VCC | 9 |
CAD (KiCad official)
- Symbol:
TRS3221EIRGTR - Footprint:
Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm - 3D model: VQFN-16(3x3) (KiCad packages3D, STEP)
- 3D model files:
trs3221eirgtr-etched.step/trs3221eirgtr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);trs3221eirgtr.step/trs3221eirgtr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (38 pp, sha256
bec7ba40ea452512, retrieved 2026-10-22, 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 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).