TRSF3232EIDR from Texas Instruments, in a SOIC-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 the C1 charge-pump flying capacitor. Connect a 0.1µF ceramic capacitor between C1+ and C1- (0.047µF at VCC=3.3V or 0.33µF at VCC=5V per app conditions).
2	V+	power_out	Positive charge-pump output for storage capacitor only (approximately +2×VCC). Connect a 0.1µF storage capacitor from V+ to GND. Absolute-max range -0.3V to 7V.
3	C1-	passive	Negative lead of the C1 charge-pump flying capacitor. Paired with C1+ (pin 1).
4	C2+	passive	Positive lead of the C2 charge-pump flying capacitor. Connect a 0.1µF ceramic capacitor between C2+ and C2-.
5	C2-	passive	Negative lead of the C2 charge-pump flying capacitor. Paired with C2+ (pin 4).
6	V-	power_out	Negative charge-pump output for storage capacitor only (approximately -2×VCC). Connect a 0.1µF storage capacitor from V- to GND. Absolute-max range 0.3V to -7V.
7	DOUT2	output	RS-232 line data output for channel 2 (to remote RS-232 system). Driven from DIN2; swings between V- and V+. ±15kV IEC 61000-4-2 air-gap and ±8kV contact ESD protected.
8	RIN2	input	RS-232 line data input for channel 2 (from remote RS-232 system). Accepts -25V to +25V, internal 5kΩ pulldown to GND. ±15kV IEC 61000-4-2 air-gap and ±8kV contact ESD protected.
9	ROUT2	output	Logic-level data output for channel 2 (to UART). CMOS output derived from RIN2, swings between GND and VCC.
10	DIN2	input	Logic-level data input for channel 2 (from UART). Accepts 5V logic even with 3.3V supply (0V to 5.5V input range). VIH = 2V at VCC=3.3V, 2.4V at VCC=5V; VIL = 0.8V.
11	DIN1	input	Logic-level data input for channel 1 (from UART). Accepts 5V logic even with 3.3V supply (0V to 5.5V input range). VIH = 2V at VCC=3.3V, 2.4V at VCC=5V; VIL = 0.8V.
12	ROUT1	output	Logic-level data output for channel 1 (to UART). CMOS output derived from RIN1, swings between GND and VCC.
13	RIN1	input	RS-232 line data input for channel 1 (from remote RS-232 system). Accepts -25V to +25V, internal 5kΩ pulldown to GND. ±15kV IEC 61000-4-2 air-gap and ±8kV contact ESD protected.
14	DOUT1	output	RS-232 line data output for channel 1 (to remote RS-232 system). Driven from DIN1; swings between V- and V+. ±15kV IEC 61000-4-2 air-gap and ±8kV contact ESD protected.
15	GND	power_in	Device ground and network reference for all supplies. Datasheet 'GRD' label; all voltages are with respect to network GND.
16	VCC	power_in	Positive supply voltage input. Connect to an external 3V to 5.5V power supply. A 1µF bypass capacitor between VCC and GND is required to meet the specified IEC ESD level for the D/PW/RGT packages.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-16
Category	Comm/UART
Pins	16

Ordering variants

Same part, different packaging or reel option.

TRSF3232EIDR
TRSF3232EIDRIDB
TRSF3232EIDRIDBR
TRSF3232EIDRIDW
TRSF3232EIDRIDWR
TRSF3232EIDRIPW
TRSF3232EIDRIPWR
TRSF3232EIDRIRGTR
TRSF3232EIDRIRGTT
TRSF3232EIDRIDYYR

CAD (KiCad official)

Symbol: TRSF3232EIDR
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (40 pp, sha256 e2825022423aa73b, retrieved 2026-08-17, tier: manufacturer)
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