UT3232G-S16-R from UTC Unisonic Tech, 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 flying capacitor C1. Connect a 0.1μF ceramic capacitor between C1+ and C1- to generate the +5.5V V+ rail.
2	V+	power_out	+5.5V rail generated internally by the voltage-doubler charge pump. Bypass to GND with a 0.1μF capacitor (C3); do not load externally.
3	C1-	passive	Negative terminal of the voltage-doubler charge-pump flying capacitor C1. Pairs with C1+ (pin 1) via a 0.1μF ceramic capacitor.
4	C2+	passive	Positive terminal of the inverting charge-pump flying capacitor C2. Connect a 0.1μF ceramic capacitor between C2+ and C2- to generate the -5.5V V- rail.
5	C2-	passive	Negative terminal of the inverting charge-pump flying capacitor C2. Pairs with C2+ (pin 4) via a 0.1μF ceramic capacitor.
6	V-	power_out	-5.5V rail generated internally by the inverting charge pump. Bypass to GND with a 0.1μF capacitor (C4); do not load externally.
7	DOUT2	output	RS-232 driver output for channel 2. Swings to approximately ±5V into a 3kΩ load; short-circuit current limited to ±60mA max.
8	RIN2	input	RS-232 receiver input for channel 2. Accepts ±25V line signals with 5kΩ typical input impedance and Schmitt-trigger hysteresis (~0.3V).
9	ROUT2	output	TTL/CMOS receiver output for channel 2. Drives VCC-referenced logic levels (VOH ≥ VCC-0.6V at -1mA; VOL ≤ 0.4V at 1.6mA).
10	DIN2	input	TTL/CMOS driver input for channel 2. VIH ≥ 2.0V (3.3V VCC) / 2.4V (5.5V VCC); VIL ≤ 0.8V. Accepts up to 5.5V regardless of VCC.
11	DIN1	input	TTL/CMOS driver input for channel 1. VIH ≥ 2.0V (3.3V VCC) / 2.4V (5.5V VCC); VIL ≤ 0.8V. Accepts up to 5.5V regardless of VCC.
12	ROUT1	output	TTL/CMOS receiver output for channel 1. Drives VCC-referenced logic levels (VOH ≥ VCC-0.6V at -1mA; VOL ≤ 0.4V at 1.6mA).
13	RIN1	input	RS-232 receiver input for channel 1. Accepts ±25V line signals with 5kΩ typical input impedance and Schmitt-trigger hysteresis (~0.3V).
14	DOUT1	output	RS-232 driver output for channel 1. Swings to approximately ±5V into a 3kΩ load; short-circuit current limited to ±60mA max.
15	GND	power_in	Ground reference for logic and RS-232 signals, and the charge-pump return.
16	VCC	power_in	+3.0V to +5.5V supply voltage. Bypass to GND with a 0.1μF ceramic capacitor (CBYPASS). Typical supply current 0.3mA (1.0mA max) with no load.

Key specifications

Parameter	Value
Manufacturer	UTC Unisonic Tech
Package	SOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

UT3232G-S16-R
UT3232G-S16-RG-P16-R

CAD (KiCad official)

Symbol: UT3232G-S16-R
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOP-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: UTC Unisonic Tech datasheet (7 pp, sha256 1bb2828c39cdcd7d, retrieved 2026-08-17, tier: manufacturer)
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