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TRS3237EIDBR

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Texas Instruments RS232 ICs, SSOP-28-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TRS3237EIDBR

Texas Instruments · RS232 ICs · SSOP-28-208mil

TRS3237EIDBR from Texas Instruments, in a SSOP-28-208mil. 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 C2+ passive Positive terminal of the charge-pump flying capacitor C2, which connects between C2+ and C2−.
2 GND power_in Network ground; the datasheet states all voltages are referenced to network GND.
3 C2− passive Negative terminal of the charge-pump flying capacitor C2, which connects between C2+ and C2−.
4 V− power_out Negative charge-pump output supply for the RS-232 drivers; the absolute maximum rating is −7 V, and it is raised toward GND in shutdown.
5 DOUT1 output RS-232 driver 1 output, forced to high impedance in shutdown; output voltage range is limited to ±13.2 V.
6 DOUT2 output RS-232 driver 2 output, forced to high impedance in shutdown; output voltage range is limited to ±13.2 V.
7 DOUT3 output RS-232 driver 3 output, forced to high impedance in shutdown; output voltage range is limited to ±13.2 V.
8 RIN1 input RS-232 receiver 1 input with ±25 V input range and ±15 kV HBM ESD protection.
9 RIN2 input RS-232 receiver 2 input with ±25 V input range and ±15 kV HBM ESD protection.
10 DOUT4 output RS-232 driver 4 output, forced to high impedance in shutdown; output voltage range is limited to ±13.2 V.
11 RIN3 input RS-232 receiver 3 input with ±25 V input range and ±15 kV HBM ESD protection.
12 DOUT5 output RS-232 driver 5 output, forced to high impedance in shutdown; output voltage range is limited to ±13.2 V.
13 EN input Receiver enable: driving EN high puts the ROUT outputs in high impedance (ROUT1B stays active); VIH is 2 V min at VCC = 3.3 V and VIL is 0.8 V max.
14 SHDN input Shutdown control: SHDN = GND disables the transmitters, forces DOUT to high impedance, and reduces supply current below 1 mA; VIL is 0.8 V max.
15 MBAUD input Data-rate select: MBAUD = GND sets 250 kbit/s operation and MBAUD = VCC sets up to 1 Mbit/s operation; logic input limits are VIH 2 V min and VIL 0.8 V max.
16 ROUT1B output Receiver 1 logic output that remains active at all times, regardless of the EN and SHDN states.
17 DIN5 input Driver 5 logic input; accepts 5-V logic with a 3.3-V supply, with VIH 2 V min and VIL 0.8 V max.
18 ROUT3 output Receiver 3 logic output, forced to high impedance when EN is high.
19 DIN4 input Driver 4 logic input; accepts 5-V logic with a 3.3-V supply, with VIH 2 V min and VIL 0.8 V max.
20 ROUT2 output Receiver 2 logic output, forced to high impedance when EN is high.
21 ROUT1 output Receiver 1 logic output, forced to high impedance when EN is high.
22 DIN3 input Driver 3 logic input; accepts 5-V logic with a 3.3-V supply, with VIH 2 V min and VIL 0.8 V max.
23 DIN2 input Driver 2 logic input; accepts 5-V logic with a 3.3-V supply, with VIH 2 V min and VIL 0.8 V max.
24 DIN1 input Driver 1 logic input; accepts 5-V logic with a 3.3-V supply, with VIH 2 V min and VIL 0.8 V max.
25 C1− passive Negative terminal of the charge-pump flying capacitor C1, which connects between C1+ and C1−.
26 VCC power_in Logic and device supply, 3 V to 5.5 V; absolute maximum rating is −0.3 V to 6 V.
27 V+ power_out Positive charge-pump output supply for the RS-232 drivers; absolute maximum rating is 7 V, and it is lowered to VCC in shutdown.
28 C1+ passive Positive terminal of the charge-pump flying capacitor C1, which connects between C1+ and C1−.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SSOP-28-208mil
Category Interface
Pins 28

CAD (KiCad official)

  • Symbol: TRS3237EIDBR
  • Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
  • 3D model: SSOP-28-208mil (KiCad packages3D, STEP)
  • 3D model files: trs3237eidbr-etched.step / trs3237eidbr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); trs3237eidbr.step / trs3237eidbr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (18 pp, sha256 b972aab2d1469ca9, retrieved 2026-10-08, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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