SP232EEN 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 C1 charge-pump flying capacitor (0.1 uF typical). Connect C1+ to C1- through the external capacitor; the internal charge pump uses this to generate V+ (approx. +2 Vcc) from Vcc.
2	V+	power_out	Regulated positive charge-pump output, approximately +2 x Vcc (roughly +10 V for Vcc = 5 V). Bypass to GND with a 0.1 uF capacitor. Powers the RS-232 driver high-level output stage.
3	C1-	passive	Negative terminal of the C1 charge-pump flying capacitor (0.1 uF typical). Pairs with C1+ (pin 1) to form the doubler stage that generates V+.
4	C2+	passive	Positive terminal of the C2 charge-pump flying capacitor (0.1 uF typical). Pairs with C2- (pin 5) to form the inverter stage that generates V-.
5	C2-	passive	Negative terminal of the C2 charge-pump flying capacitor (0.1 uF typical). Pairs with C2+ (pin 4) to form the inverter stage that generates V-.
6	V-	power_out	Regulated negative charge-pump output, approximately -2 x Vcc (roughly -10 V for Vcc = 5 V). Bypass to GND with a 0.1 uF capacitor. Powers the RS-232 driver low-level output stage.
7	T2OUT	output	RS-232 driver 2 output. Bipolar RS-232 line-level output swinging between approximately V- and V+; guaranteed +/-5 V swing into a 3 kOhm load. Short-circuit protected with output current limited to +/-60 mA.
8	R2IN	input	RS-232 receiver 2 input. Accepts RS-232 line levels (+/-30 V absolute max), internally pulled to ground through a 3-7 kOhm input resistor. Thresholds nominally 0.8 V (low) / 2.4 V (high) with ~0.5 V hysteresis.
9	R2OUT	output	RS-232 receiver 2 output at TTL/CMOS levels. Drives Vol <= 0.4 V at 3.2 mA and Voh >= 3.5 V at -1 mA; inverts the RS-232 sense of R2IN.
10	T2IN	input	RS-232 driver 2 TTL/CMOS input. Thresholds Vil <= 0.8 V, Vih >= 2 V; input leakage <= +/-10 uA over 0 to Vcc.
11	T1IN	input	RS-232 driver 1 TTL/CMOS input. Thresholds Vil <= 0.8 V, Vih >= 2 V; input leakage <= +/-10 uA over 0 to Vcc.
12	R1OUT	output	RS-232 receiver 1 output at TTL/CMOS levels. Drives Vol <= 0.4 V at 3.2 mA and Voh >= 3.5 V at -1 mA; inverts the RS-232 sense of R1IN.
13	R1IN	input	RS-232 receiver 1 input. Accepts RS-232 line levels (+/-30 V absolute max), internally pulled to ground through a 3-7 kOhm input resistor. Thresholds nominally 0.8 V (low) / 2.4 V (high) with ~0.5 V hysteresis.
14	T1OUT	output	RS-232 driver 1 output. Bipolar RS-232 line-level output swinging between approximately V- and V+; guaranteed +/-5 V swing into a 3 kOhm load. Short-circuit protected with output current limited to +/-60 mA.
15	GND	power_in	Ground / 0 V reference. Common return for Vcc, V+, V-, charge-pump capacitors and all logic/RS-232 signals.
16	VCC	power_in	Positive supply, +4.5 V to +5.5 V (5 V typical). Supply current is 10 mA max (no load, Ta = 25 C). Decouple to GND with a 0.1 uF capacitor close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SP232EEN

CAD (KiCad official)

Symbol: SP232EEN
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
`sp232een.step`	217 KB	You want the bare part, or you mark your own boards.
`sp232een-etched.step`	2.2 MB	You want the part with `SP232EEN` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 558 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 (10 pp, sha256 e216ce543906014c, 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