ST3232BDR from UMW, in a SOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	C1+	passive	Positive terminal of the voltage-doubler charge-pump capacitor C1. Connect a 0.1µF ceramic capacitor between C1+ and C1- (pin 3). Part of the internal charge pump generating V+ ≈ +5.5V.
2	V+	power_out	Regulated +5.5V rail generated internally by the charge pump. Bypass to GND with a 0.1µF capacitor. Do not load externally beyond the internal driver requirements.
3	C1-	passive	Negative terminal of the voltage-doubler charge-pump capacitor C1. Connect to C1+ (pin 1) through a 0.1µF ceramic capacitor.
4	C2+	passive	Positive terminal of the inverting charge-pump capacitor C2. Connect a 0.1µF ceramic capacitor between C2+ and C2- (pin 5). Part of the internal charge pump generating V- ≈ -5.5V.
5	C2-	passive	Negative terminal of the inverting charge-pump capacitor C2. Connect to C2+ (pin 4) through a 0.1µF ceramic capacitor.
6	V-	power_out	Regulated -5.5V rail generated internally by the inverting charge pump. Bypass to GND with a 0.1µF capacitor. Do not load externally beyond the internal driver requirements.
7	DOUT2	output	RS-232 driver output for channel 2. Swings between V+ and V- levels (typically ±5.4V). Meets TIA/EIA-232-F output specifications; short-circuit current typically ±35 mA.
8	RIN2	input	RS-232 receiver input for channel 2. Accepts ±25V input swing with typical 5kΩ input resistance. Positive-going threshold typ 1.5V, negative-going typ 1.2V (VCC=3.3V); ~0.3V hysteresis.
9	ROUT2	output	TTL/CMOS receiver output for channel 2. Drives to VCC-0.1V high / 0.4V low with 1.6 mA sink current. Level-translated version of RIN2 for the host UART.
10	DIN2	input	TTL/CMOS driver input for channel 2. VIH ≥ 2.0V (VCC=3.3V) / 2.4V (VCC=5.5V); VIL ≤ 0.8V. Accepts up to 5.5V input even with 3.3V VCC.
11	DIN1	input	TTL/CMOS driver input for channel 1. VIH ≥ 2.0V (VCC=3.3V) / 2.4V (VCC=5.5V); VIL ≤ 0.8V. Accepts up to 5.5V input even with 3.3V VCC.
12	ROUT1	output	TTL/CMOS receiver output for channel 1. Drives to VCC-0.1V high / 0.4V low with 1.6 mA sink current. Level-translated version of RIN1 for the host UART.
13	RIN1	input	RS-232 receiver input for channel 1. Accepts ±25V input swing with typical 5kΩ input resistance. Positive-going threshold typ 1.5V, negative-going typ 1.2V (VCC=3.3V); ~0.3V hysteresis.
14	DOUT1	output	RS-232 driver output for channel 1. Swings between V+ and V- levels (typically ±5.4V). Meets TIA/EIA-232-F output specifications; short-circuit current typically ±35 mA.
15	GND	power_in	Device ground reference. All voltages are with respect to this network GND.
16	VCC	power_in	Supply voltage input, +3.0V to +5.5V. Typical supply current 1 mA (no load, VCC=3.3V). Bypass to GND with a 0.1µF ceramic capacitor.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOP-16
Category	Comm/UART
Pins	16

Ordering variants

Same part, different packaging or reel option.

ST3232BDR

CAD (KiCad official)

Symbol: ST3232BDR
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`st3232bdr.step`	217 KB	You want the bare part, or you mark your own boards.
`st3232bdr-etched.step`	2.7 MB	You want the part with `ST3232BDR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 662 faces against 267 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: UMW datasheet (11 pp, sha256 72932421b486abe4, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF