ADM232AARNZ 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 charge-pump capacitor C1 (0.1µF). Connects to C1- (pin 3) via the flying capacitor used to double VCC to V+.
2	V+	power_out	+2·VCC (approximately +10V) generated by the charge-pump. Bypass to GND with 0.1µF capacitor.
3	C1-	passive	Negative terminal of charge-pump capacitor C1 (0.1µF). Pairs with C1+ (pin 1).
4	C2+	passive	Positive terminal of charge-pump capacitor C2 (0.1µF). Connects to C2- (pin 5) via the flying capacitor used to invert V+ to V-.
5	C2-	passive	Negative terminal of charge-pump capacitor C2 (0.1µF). Pairs with C2+ (pin 4).
6	V-	power_out	-2·VCC (approximately -10V) generated by the charge-pump. Bypass to GND with 0.1µF capacitor.
7	T2OUT	output	RS-232 driver 2 output. Swings ±5V minimum (typ ±10V) into a 3kΩ to 7kΩ load. Short-circuit current ±60mA max, short-circuit tolerant continuously.
8	R2IN	input	RS-232 receiver 2 input. Accepts ±30V RS-232 line levels; input resistance 3-7 kΩ. Thresholds: VIL=0.8V, VIH=2.4V (typ) with 0.2-1V hysteresis.
9	R2OUT	output	RS-232 receiver 2 TTL/CMOS output. VOL ≤ 0.4V @ 3.2mA sink, VOH ≥ 3.5V @ 1mA source.
10	T2IN	input	RS-232 driver 2 TTL/CMOS input. VIL ≤ 0.8V, VIH ≥ 2V. Input leakage 0.2µA typ / ±10µA max.
11	T1IN	input	RS-232 driver 1 TTL/CMOS input. VIL ≤ 0.8V, VIH ≥ 2V. Input leakage 0.2µA typ / ±10µA max.
12	R1OUT	output	RS-232 receiver 1 TTL/CMOS output. VOL ≤ 0.4V @ 3.2mA sink, VOH ≥ 3.5V @ 1mA source.
13	R1IN	input	RS-232 receiver 1 input. Accepts ±30V RS-232 line levels; input resistance 3-7 kΩ. Thresholds: VIL=0.8V, VIH=2.4V (typ) with 0.2-1V hysteresis.
14	T1OUT	output	RS-232 driver 1 output. Swings ±5V minimum (typ ±10V) into a 3kΩ to 7kΩ load. Short-circuit current ±60mA max, short-circuit tolerant continuously.
15	GND	power_in	Ground reference (0V).
16	VCC	power_in	+4.5V to +5.5V supply voltage input. ICC ≤ 10mA (no load, TA=25°C). Bypass to GND with 0.1µF.

Key specifications

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

Ordering variants

ADM232AARNZ

CAD (KiCad official)

Symbol: ADM232AARNZ
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
`adm232aarnz.step`	217 KB	You want the bare part, or you mark your own boards.
`adm232aarnz-etched.step`	2.4 MB	You want the part with `ADM232AARNZ` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 621 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 25692d681f312ba2, 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