SP3243EBEA-L from MaxLinear, in a SSOP-28-208mil. 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	C2+	passive	Positive terminal of the inverting charge-pump flying capacitor C2 (0.1µF, 16V min).
2	C2-	passive	Negative terminal of the inverting charge-pump flying capacitor C2 (0.1µF, 16V min).
3	V-	power_out	Regulated -5.5V output generated by the internal charge pump. Bypass to GND with 0.1µF capacitor C4.
4	R1IN	input	RS-232 receiver 1 input. Accepts ±15V RS-232 line levels; internal 5kΩ pulldown commits output HIGH when open.
5	R2IN	input	RS-232 receiver 2 input. Feeds the always-active non-inverting receiver R2OUT (active in shutdown) as well as the standard R2OUT receiver.
6	R3IN	input	RS-232 receiver 3 input. Accepts ±15V RS-232 line levels; internal 5kΩ pulldown.
7	R4IN	input	RS-232 receiver 4 input. Accepts ±15V RS-232 line levels; internal 5kΩ pulldown.
8	R5IN	input	RS-232 receiver 5 input. Accepts ±15V RS-232 line levels; internal 5kΩ pulldown.
9	T1OUT	output	RS-232 driver 1 output. Delivers ±5.4V typical output swing into a 3kΩ load.
10	T2OUT	output	RS-232 driver 2 output. Delivers ±5.4V typical output swing into a 3kΩ load.
11	T3OUT	output	RS-232 driver 3 output. Delivers ±5.4V typical output swing into a 3kΩ load.
12	T3IN	input	TTL/CMOS driver 3 input. Logic threshold 0.8V LOW / 2.4V HIGH. Unused driver inputs should be tied to GND or VCC.
13	T2IN	input	TTL/CMOS driver 2 input. Logic threshold 0.8V LOW / 2.4V HIGH.
14	T1IN	input	TTL/CMOS driver 1 input. Logic threshold 0.8V LOW / 2.4V HIGH.
15	R5OUT	output	TTL/CMOS receiver 5 output. High-Z in shutdown or when AUTO ON-LINE is disabled.
16	R4OUT	output	TTL/CMOS receiver 4 output. High-Z in shutdown or when AUTO ON-LINE is disabled.
17	R3OUT	output	TTL/CMOS receiver 3 output. High-Z in shutdown or when AUTO ON-LINE is disabled.
18	R2OUT	output	TTL/CMOS receiver 2 output (inverting standard receiver). High-Z in shutdown or when AUTO ON-LINE is disabled.
19	R1OUT	output	TTL/CMOS receiver 1 output. High-Z in shutdown or when AUTO ON-LINE is disabled.
20	R2OUT_B	output	Non-inverting receiver-2 output; remains active during shutdown to monitor an external Ring Indicate signal.
21	STATUS	output	TTL/CMOS output indicating the AUTO ON-LINE / shutdown status of the transceiver. VOL ≤ 0.4V @ IOUT=1.6mA; VOH ≥ VCC-0.6V @ IOUT=-1.0mA.
22	SHUTDOWN	input	Active-LOW shutdown input. Logic LOW shuts down drivers and charge pump, overriding AUTO ON-LINE and ONLINE. Refer to Table 2 truth table.
23	ONLINE	input	Active-LOW AUTO ON-LINE enable. Apply logic HIGH to override AUTO ON-LINE circuitry and force drivers active (SHUTDOWN must also be HIGH).
24	C1-	passive	Negative terminal of the voltage-doubler charge-pump flying capacitor C1 (0.1µF, 16V min).
25	GND	power_in	Device ground reference.
26	VCC	power_in	+3.0V to +5.5V supply input. Bypass to GND with 0.1µF capacitor C5.
27	V+	power_out	Regulated +5.5V output generated by the internal charge pump. Bypass to GND with 0.1µF capacitor C3.
28	C1+	passive	Positive terminal of the voltage-doubler charge-pump flying capacitor C1 (0.1µF, 16V min).

Key specifications

Parameter	Value
Manufacturer	MaxLinear
Package	SSOP-28-208mil
Category	Interface
Pins	28

Ordering variants

Same part, different packaging or reel option.

SP3243EBEA-L
SP3243EBEA-LEBCA
SP3243EBEA-LEBCA-L
SP3243EBEA-LEBUA
SP3243EBEA-LEBUA-L
SP3243EBEA-LEUCR

CAD (KiCad official)

Symbol: SP3243EBEA-L
Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
3D model: SSOP-28-208mil (KiCad packages3D, STEP)

Provenance

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

Datasheet: MaxLinear datasheet (24 pp, sha256 b138bf5034e0cd89, 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