ST3232EBTR from UMW, in a TSSOP-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 flying capacitor C1. Connects to the external ceramic capacitor (typ. 0.1 µF at Vcc=3.3V; 0.047 µF at Vcc=5V) whose negative terminal ties to C1- (pin 3).
2	V+	power_out	Positive charge-pump output (approximately +5.5V generated by the internal voltage-doubler). Requires an external reservoir capacitor (typ. 0.1 µF / 0.33 µF depending on Vcc) to GND. Absolute max +7V.
3	C1-	passive	Negative terminal of the voltage-doubler charge-pump flying capacitor C1 (paired with C1+ on pin 1).
4	C2+	passive	Positive terminal of the inverting charge-pump flying capacitor C2. Connects to the negative terminal on C2- (pin 5).
5	C2-	passive	Negative terminal of the inverting charge-pump flying capacitor C2 (paired with C2+ on pin 4).
6	V-	power_out	Negative charge-pump output (approximately -5.5V generated by the internal inverter). Requires an external reservoir capacitor (typ. 0.1 µF / 0.33 µF depending on Vcc) to GND. Absolute max -7V.
7	DOUT2	output	RS-232 driver #2 output. Drives the RS-232 line between roughly ±5V (VOH ≥ +5.0V, VOL ≤ -5.0V into 3 kΩ). Short-circuit current limited to ±35..±60 mA. Transition slew rate 6-30 V/µs.
8	RIN2	input	RS-232 receiver #2 input. Accepts ±25V RS-232 line levels with 5 kΩ input impedance (3-7 kΩ). Hysteretic threshold: VIT+ ≈ 1.5V typ, VIT- ≈ 1.2V typ at Vcc=3.3V (0.3V typical hysteresis).
9	ROUT2	output	TTL/CMOS receiver #2 output. Drives logic-level output rail-to-rail (VOH ≥ Vcc-0.6V at -1 mA; VOL ≤ 0.4V at 1.6 mA).
10	DIN2	input	TTL/CMOS driver #2 logic input. VIH ≥ 2V (Vcc=3.3V) or ≥ 2.4V (Vcc=5.5V); VIL ≤ 0.8V. Accepts up to 5.0V logic input even with a 3.3V supply.
11	DIN1	input	TTL/CMOS driver #1 logic input. VIH ≥ 2V (Vcc=3.3V) or ≥ 2.4V (Vcc=5.5V); VIL ≤ 0.8V. Accepts up to 5.0V logic input even with a 3.3V supply.
12	ROUT1	output	TTL/CMOS receiver #1 output. Drives logic-level output rail-to-rail (VOH ≥ Vcc-0.6V at -1 mA; VOL ≤ 0.4V at 1.6 mA).
13	RIN1	input	RS-232 receiver #1 input. Accepts ±25V RS-232 line levels with 5 kΩ input impedance (3-7 kΩ). Hysteretic threshold: VIT+ ≈ 1.5V typ, VIT- ≈ 1.2V typ at Vcc=3.3V.
14	DOUT1	output	RS-232 driver #1 output. Drives the RS-232 line between roughly ±5V (VOH ≥ +5.0V, VOL ≤ -5.0V into 3 kΩ). Short-circuit current limited to ±35..±60 mA. Transition slew rate 6-30 V/µs.
15	GND	power_in	Device ground reference for both the logic side and the RS-232 charge-pump network.
16	VCC	power_in	Positive logic supply, +3.0V to +5.5V (absolute max +6.0V). Requires an external bypass capacitor to GND (typ. 0.1 µF). Typical no-load supply current ~1 mA (max 3 mA) at Vcc=3.3V.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	TSSOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

ST3232EBTR
ST3232EBTRBDR
ST3232EBTRCDR

CAD (KiCad official)

Symbol: ST3232EBTR
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`st3232ebtr.step`	205 KB	You want the bare part, or you mark your own boards.
`st3232ebtr-etched.step`	2.7 MB	You want the part with `ST3232EBTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 664 faces against 255 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