SP232EEN-L from MaxLinear, 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 terminal of charge-pump capacitor C1 (0.1uF typical, ceramic). Used by the internal charge pump in phase 1/3 to double Vcc for generating V+.
2	V+	power_out	Regulated positive charge-pump output, nominally +6V referenced to GND. Requires a reservoir capacitor (0.1uF, C3) to GND. Supplies the RS-232 driver positive rail.
3	C1-	passive	Negative terminal of charge-pump capacitor C1 (0.1uF ceramic). Switched between GND and V+ storage during the charge-pump doubling phases.
4	C2+	passive	Positive terminal of charge-pump capacitor C2 (0.1uF ceramic). Used together with C1 to double and invert Vcc for producing V-.
5	C2-	passive	Negative terminal of charge-pump capacitor C2 (0.1uF ceramic). Switched between GND and the C2 inversion node during charge-pump phases 2 and 4.
6	V-	power_out	Regulated negative charge-pump output, nominally -6V referenced to GND. Requires a reservoir capacitor (0.1uF, C4) to GND. Supplies the RS-232 driver negative rail.
7	T2OUT	output	RS-232 driver #2 output. Inverted level-shifted transmit output, +/-6V typical swing (guaranteed +/-5.0V) into a 3k-ohm load with 2500pF, meeting EIA/TIA-232 and V.28. Short-circuit protected to GND.
8	R2IN	input	RS-232 receiver #2 input. Accepts +/-15V input range with typical thresholds of 1.2V (LOW) and 1.7V (HIGH) and ~500mV hysteresis; presents 3-7k-ohm input resistance to GND with an internal 5k pull-down.
9	R2OUT	output	Receiver #2 inverted TTL/CMOS logic output. Drives 0.4V max LOW at 3.2mA sink and 3.5V min HIGH at 1.0mA source with Vcc=5V.
10	T2IN	input	TTL/CMOS logic input for driver #2. Logic thresholds 0.8V (LOW) / 2.0V (HIGH); internal pull-up of ~15uA typical to Vcc keeps unused inputs defined.
11	T1IN	input	TTL/CMOS logic input for driver #1. Logic thresholds 0.8V (LOW) / 2.0V (HIGH); internal pull-up of ~15uA typical to Vcc keeps unused inputs defined.
12	R1OUT	output	Receiver #1 inverted TTL/CMOS logic output. Drives 0.4V max LOW at 3.2mA sink and 3.5V min HIGH at 1.0mA source with Vcc=5V.
13	R1IN	input	RS-232 receiver #1 input. Accepts +/-15V input range with typical thresholds of 1.2V (LOW) and 1.7V (HIGH) and ~500mV hysteresis; 3-7k-ohm input resistance with an internal 5k pull-down to GND.
14	T1OUT	output	RS-232 driver #1 output. Inverted level-shifted transmit output, +/-6V typical swing (guaranteed +/-5.0V) into a 3k-ohm load with 2500pF, short-circuit protected to GND.
15	GND	power_in	Device ground / 0V reference for supply, TTL logic side and RS-232 signal side.
16	VCC	power_in	+5V supply input (5V +/-10%). Typical unloaded supply current 3mA (5mA max); ~15mA under full transmit load with all transmitters driving 3k-ohm. Bypass to GND with a 0.1uF ceramic close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SP232EEN-L
SP232EEN-L/TR
SP232ECN-L
SP232ECN-L/TR
SP232ECP-L
SP232EEP-L
SP232ECT-L
SP232ECT-L/TR
SP232EET-L
SP232EET-L/TR

CAD (KiCad official)

Symbol: SP232EEN-L
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sp232een-l.step`	217 KB	You want the bare part, or you mark your own boards.
`sp232een-l-etched.step`	2.3 MB	You want the part with `SP232EEN-L` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 584 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: MaxLinear datasheet (18 pp, sha256 4c56f98c6d2bf27f, 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