HGX232EIMT from HGSEMI, in a TSSOP-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 positive charge-pump voltage multiplier. Connect a 0.1 uF capacitor between C1+ (pin 1) and C1- (pin 3).
2	V+	power_out	Output of the positive voltage multiplier (approx. +2*VCC, typ. +10V). Requires an external 0.1 uF reservoir capacitor to GND. Used internally as the positive rail for the RS-232 line drivers.
3	C1-	passive	Negative terminal of the flying capacitor for the positive charge-pump voltage multiplier. Pair with C1+ (pin 1) via a 0.1 uF capacitor.
4	C2+	passive	Positive terminal of the flying capacitor for the negative charge-pump voltage inverter. Connect a 0.1 uF capacitor between C2+ (pin 4) and C2- (pin 5).
5	C2-	passive	Negative terminal of the flying capacitor for the negative charge-pump voltage inverter. Pair with C2+ (pin 4) via a 0.1 uF capacitor.
6	V-	power_out	Output of the negative voltage inverter (approx. -2*VCC, typ. -10V). Requires an external 0.1 uF reservoir capacitor to GND. Used internally as the negative rail for the RS-232 line drivers.
7	T2OUT	output	Transmitter 2 output at RS-232 levels (typically +/-5V into 3 kOhm load). Inverting driver output for the T2IN TTL/CMOS input. Short-circuit current limited to +/-60 mA.
8	R2IN	input	Receiver 2 input at RS-232 levels. Accepts -30V to +30V input range with internal 5 kOhm pull-down (input resistance 3-7 kOhm). Switching thresholds Von ~2.4V / Voff ~0.8V with hysteresis.
9	R2OUT	output	Receiver 2 output at TTL/CMOS levels. Inverting receiver output driving VOL <= 0.4V @ 3.2 mA and VOH >= 3.5V @ -1.0 mA on VCC = 4.5V.
10	T2IN	input	Transmitter 2 input at TTL/CMOS levels. Drives T2OUT (pin 7) as an RS-232 output. Input current is 1.0 mkA typical, 10 mkA over temperature.
11	T1IN	input	Transmitter 1 input at TTL/CMOS levels. Drives T1OUT (pin 14) as an RS-232 output. Input current 1.0 mkA typical.
12	R1OUT	output	Receiver 1 output at TTL/CMOS levels. Inverting receiver output driving VOL <= 0.4V @ 3.2 mA and VOH >= 3.5V @ -1.0 mA on VCC = 4.5V.
13	R1IN	input	Receiver 1 input at RS-232 levels. Accepts -30V to +30V input range with internal 5 kOhm pull-down (input resistance 3-7 kOhm). Switching thresholds Von ~2.4V / Voff ~0.8V with hysteresis.
14	T1OUT	output	Transmitter 1 output at RS-232 levels (typically +/-5V into 3 kOhm load). Inverting driver output for the T1IN TTL/CMOS input. Short-circuit current limited to +/-60 mA.
15	GND	power_in	Common ground reference for logic and RS-232 sides, and return for the charge-pump reservoir capacitors on V+ and V-.
16	VCC	power_in	Positive supply input, 4.5 V to 5.5 V (absolute max 6.0 V). Bypass with 0.1 uF to GND. Static consumption current ICC = 10 mA typ / 14 mA max.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	TSSOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

HGX232EIMT/TR
HGX232ECM/TR
HGX232EIM/TR
HGX232ECN
HGX232EIN

CAD (KiCad official)

Symbol: HGX232EIMT
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HGSEMI datasheet (11 pp, sha256 10f1bf5b12850453, 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