SP3232EUEY-L from MaxLinear, 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 voltage doubler charge-pump capacitor (C1, typ 0.1µF). Connect between C1+ and C1-.
2	V+	power_out	+5.5V output generated by the internal charge pump. Bypass to GND with a 0.1µF capacitor.
3	C1-	passive	Negative terminal of the voltage doubler charge-pump capacitor (C1, typ 0.1µF).
4	C2+	passive	Positive terminal of the inverting charge-pump capacitor (C2, typ 0.1µF). Connect between C2+ and C2-.
5	C2-	passive	Negative terminal of the inverting charge-pump capacitor (C2, typ 0.1µF).
6	V-	power_out	-5.5V output generated by the internal inverting charge pump. Bypass to GND with a 0.1µF capacitor.
7	T2OUT	output	RS-232 driver #2 output. Typical output swing ±5.4V into a 3kΩ load; ±15kV ESD protected.
8	R2IN	input	RS-232 receiver #2 input. Accepts ±15V RS-232 signals; input resistance 3-7kΩ (typ 5kΩ).
9	R2OUT	output	TTL/CMOS receiver #2 output. Drives VOL ≤ 0.4V @ 1.6mA and VOH ≥ VCC-0.6V @ -1mA.
10	T2IN	input	TTL/CMOS driver #2 input. Logic threshold LOW ≤ 0.8V, HIGH ≥ 2.0V at VCC=3.3V; typ 250mV input hysteresis.
11	T1IN	input	TTL/CMOS driver #1 input. Logic threshold LOW ≤ 0.8V, HIGH ≥ 2.0V at VCC=3.3V; typ 250mV input hysteresis.
12	R1OUT	output	TTL/CMOS receiver #1 output. Drives VOL ≤ 0.4V @ 1.6mA and VOH ≥ VCC-0.6V @ -1mA.
13	R1IN	input	RS-232 receiver #1 input. Accepts ±15V RS-232 signals; input resistance 3-7kΩ (typ 5kΩ).
14	T1OUT	output	RS-232 driver #1 output. Typical output swing ±5.4V into a 3kΩ load; ±15kV ESD protected.
15	GND	power_in	Device ground reference.
16	VCC	power_in	Positive supply, +3.0V to +5.5V. Bypass to GND with a 0.1µF capacitor. Absolute max +6.0V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SP3232EUEY-LEUCY-L/TR
SP3232EUEY-L/TR
SP3232EUEY-LEUCN-L
SP3232EUEY-LEUCN-L/TR
SP3232EUEY-LEUEA-L

CAD (KiCad official)

Symbol: SP3232EUEY-L
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: MaxLinear datasheet (20 pp, sha256 69636e7f4c5d9299, 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