SP3232EEN 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 flying capacitor C1. Connect an external ceramic capacitor between C1+ and C1- (typ. 0.1 µF at 3.3V, 0.047 µF at 5V per Table 1).
2	V+	power_out	Regulated +5.5V output generated by the voltage-doubler charge pump. Bypass to GND with a ceramic capacitor C3 (typ. 0.1 µF to 0.33 µF per Table 1). Absolute max range -0.3V to +7.0V.
3	C1-	passive	Negative terminal of the voltage-doubler charge-pump flying capacitor C1.
4	C2+	passive	Positive terminal of the inverting charge-pump flying capacitor C2. Connect an external ceramic capacitor between C2+ and C2-.
5	C2-	passive	Negative terminal of the inverting charge-pump flying capacitor C2.
6	V-	power_out	Regulated -5.5V output generated by the inverting charge pump. Bypass to GND with a ceramic capacitor C4 (typ. 0.1 µF to 0.33 µF per Table 1). Absolute max range +0.3V to -7.0V.
7	DOUT2	output	RS-232 driver output for channel 2. Swings between V- and V+ (typ. ±5.4V into 3kΩ). Short-circuit current limited to ±60 mA max. Absolute max output range -13.2V to +13.2V.
8	RIN2	input	RS-232 receiver input for channel 2. Accepts ±25V line levels; internal 5kΩ (typ.) pull-down to GND. Positive-going threshold typ. 1.5V, negative-going typ. 1.2V (VCC=3.3V).
9	ROUT2	output	TTL/CMOS receiver output for channel 2. VOH typ. VCC-0.1V at IOH=-1.0 mA; VOL max 0.4V at IOL=1.6 mA.
10	DIN2	input	TTL/CMOS driver input for channel 2. VIH min 2.0V (VCC=3.3V) / 2.4V (VCC=5.5V); VIL max 0.8V. Accepts 5.0V logic with 3.3V supply. Absolute max input 6.0V.
11	DIN1	input	TTL/CMOS driver input for channel 1. VIH min 2.0V (VCC=3.3V) / 2.4V (VCC=5.5V); VIL max 0.8V. Accepts 5.0V logic with 3.3V supply.
12	ROUT1	output	TTL/CMOS receiver output for channel 1. VOH typ. VCC-0.1V at IOH=-1.0 mA; VOL max 0.4V at IOL=1.6 mA.
13	RIN1	input	RS-232 receiver input for channel 1. Accepts ±25V line levels; internal 5kΩ (typ.) pull-down to GND. Positive-going threshold typ. 1.5V, negative-going typ. 1.2V (VCC=3.3V).
14	DOUT1	output	RS-232 driver output for channel 1. Swings between V- and V+ (typ. ±5.4V into 3kΩ). Short-circuit current limited to ±60 mA max.
15	GND	power_in	Device ground reference. All voltages are specified with respect to network GND.
16	VCC	power_in	Positive supply, +3.0V to +5.5V. Typical supply current 1 mA (no load, VCC=3.3V), 3 mA max. Bypass to GND with a ceramic capacitor CBYPASS (typ. 0.1 µF, see Table 1).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SP3232EEN

CAD (KiCad official)

Symbol: SP3232EEN
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: UMW datasheet (11 pp, sha256 053c1ca2d27a6dfd, 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