BL13232ESO from BL Shanghai Belling, 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 lead of charge-pump flying capacitor C1. Connect a 0.1 µF (Vcc=3.3V) or 0.047 µF (Vcc=5V) ceramic capacitor between C1+ and C1-.
2	V+	power_out	Positive charge-pump output for storage capacitor only (typ +2×VCC). Connect a 0.1 µF (Vcc=3.3V) or 0.33 µF (Vcc=5V) reservoir capacitor from V+ to GND.
3	C1-	passive	Negative lead of charge-pump flying capacitor C1.
4	C2+	passive	Positive lead of charge-pump flying capacitor C2. Connect a 0.1 µF (Vcc=3.3V) or 0.33 µF (Vcc=5V) ceramic capacitor between C2+ and C2-.
5	C2-	passive	Negative lead of charge-pump flying capacitor C2.
6	V-	power_out	Negative charge-pump output for storage capacitor only (typ -2×VCC). Connect a 0.1 µF (Vcc=3.3V) or 0.33 µF (Vcc=5V) reservoir capacitor from V- to GND.
7	DOUT2	output	RS-232 line-driver output for channel 2. Swings approximately ±5.4V into a 3 kΩ load; short-circuit current typ ±30 mA.
8	RIN2	input	RS-232 line-receiver input for channel 2. Input voltage range ±25V; input resistance 3-7 kΩ. Positive threshold typ 1.5-2.0V, hysteresis typ 0.4V.
9	ROUT2	output	TTL/CMOS receiver output for channel 2. VOH ≥ VCC-0.6V at -1 mA; VOL ≤ 0.4V at 1.6 mA.
10	DIN2	input	TTL/CMOS driver input for channel 2. Accepts 5V logic input even with 3.3V supply. VIH ≥ 2V (VCC=3.3V) / 2.4V (VCC=5V); VIL ≤ 0.8V.
11	DIN1	input	TTL/CMOS driver input for channel 1. Accepts 5V logic input even with 3.3V supply. VIH ≥ 2V (VCC=3.3V) / 2.4V (VCC=5V); VIL ≤ 0.8V.
12	ROUT1	output	TTL/CMOS receiver output for channel 1. VOH ≥ VCC-0.6V at -1 mA; VOL ≤ 0.4V at 1.6 mA.
13	RIN1	input	RS-232 line-receiver input for channel 1. Input voltage range ±25V; input resistance 3-7 kΩ. Positive threshold typ 1.5-2.0V, hysteresis typ 0.4V.
14	DOUT1	output	RS-232 line-driver output for channel 1. Swings approximately ±5.4V into a 3 kΩ load; short-circuit current typ ±30 mA.
15	GND	power_in	Ground reference (0V).
16	VCC	power_in	Supply voltage. Single supply 3V to 5.5V (3.3V ±0.3V or 5V ±0.5V typical). Bypass with a 0.1 µF capacitor to GND. ICC typ 1.5 mA (no load).

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOP-16
Category	Comm/UART
Pins	16

Ordering variants

Same part, different packaging or reel option.

BL13232ESO
BL13232ESOETS

CAD (KiCad official)

Symbol: BL13232ESO
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
`bl13232eso.step`	217 KB	You want the bare part, or you mark your own boards.
`bl13232eso-etched.step`	2.7 MB	You want the part with `BL13232ESO` 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 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: BL Shanghai Belling datasheet (7 pp, sha256 07cda8603d0a6a3a, 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