CBM232AS16 from Corebai Microelectronics, 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 flying capacitor for the +V charge-pump voltage doubler. Connect a 1.0 μF capacitor between C1+ (pin 1) and C1- (pin 3).
2	V+	power_out	Positive output of the internal voltage doubler (approximately +2·VCC, ~+10 V). Bypass to GND with a 1.0 μF reservoir capacitor; this rail supplies the RS-232 transmitters' high output level.
3	C1-	passive	Negative terminal of the flying capacitor for the +V charge-pump voltage doubler. Pairs with C1+ (pin 1) via a 1.0 μF capacitor.
4	C2+	passive	Positive terminal of the flying capacitor for the -V charge-pump voltage inverter. Connect a 1.0 μF capacitor between C2+ (pin 4) and C2- (pin 5).
5	C2-	passive	Negative terminal of the flying capacitor for the -V charge-pump voltage inverter. Pairs with C2+ (pin 4) via a 1.0 μF capacitor.
6	V-	power_out	Negative output of the internal voltage inverter (approximately -2·VCC, ~-10 V). Bypass to GND with a 1.0 μF reservoir capacitor; this rail supplies the RS-232 transmitters' low output level.
7	T2OUT	output	Channel-2 RS-232 transmitter output. Drives an RS-232 line at ±5 V min (typ ±5.2 V into a 3 kΩ load); logically inverting versus T2IN.
8	R2IN	input	Channel-2 RS-232 receiver input. Accepts ±30 V RS-232 signals through an internal ~5 kΩ termination to ground; inverting to R2OUT with typical 0.9 V hysteresis.
9	R2OUT	output	Channel-2 TTL/CMOS receiver output. Drives VOH ≥ 3.6 V and VOL ≤ 0.3 V at IOL = 3.2 mA; logically inverting versus R2IN.
10	T2IN	input	Channel-2 TTL/CMOS transmitter input. Accepts 0 V to VCC logic levels (VIH = 2.0 V, VIL = 0.8 V); drives T2OUT inverted onto the RS-232 line.
11	T1IN	input	Channel-1 TTL/CMOS transmitter input. Accepts 0 V to VCC logic levels (VIH = 2.0 V, VIL = 0.8 V); drives T1OUT inverted onto the RS-232 line.
12	R1OUT	output	Channel-1 TTL/CMOS receiver output. Drives VOH ≥ 3.6 V and VOL ≤ 0.3 V at IOL = 3.2 mA; logically inverting versus R1IN.
13	R1IN	input	Channel-1 RS-232 receiver input. Accepts ±30 V RS-232 signals through an internal ~5 kΩ termination to ground; inverting to R1OUT with typical 0.9 V hysteresis.
14	T1OUT	output	Channel-1 RS-232 transmitter output. Drives an RS-232 line at ±5 V min (typ ±5.2 V into a 3 kΩ load); logically inverting versus T1IN.
15	GND	power_in	Ground return / common reference for logic, RS-232 signaling, and charge-pump capacitors.
16	VCC	power_in	Positive supply input, 4.5 V to 5.5 V (nominal 5 V). Bypass to GND with a 1.0 μF capacitor; typical static ICC ≤ 10 mA at 25 °C.

Key specifications

Parameter	Value
Manufacturer	Corebai Microelectronics
Package	SOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

CBM232AS16
CBM232ACS16

CAD (KiCad official)

Symbol: CBM232AS16
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: Corebai Microelectronics datasheet (9 pp, sha256 0d944b0e3d04a763, 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