SP3243EUCA-L from MaxLinear, in a SSOP-28-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	C2+	passive	Positive terminal of the inverting charge-pump capacitor.
2	C2-	passive	Negative terminal of the inverting charge-pump capacitor.
3	V-	power_out	Regulated -5.5V output generated by the charge pump.
4	R1IN	input	RS-232 receiver input (internal 5kΩ pulldown, ±15kV ESD protected, ±25V absolute maximum).
5	R2IN	input	RS-232 receiver input (internal 5kΩ pulldown, ±15kV ESD protected, ±25V absolute maximum).
6	R3IN	input	RS-232 receiver input (internal 5kΩ pulldown, ±15kV ESD protected, ±25V absolute maximum).
7	R4IN	input	RS-232 receiver input (internal 5kΩ pulldown, ±15kV ESD protected, ±25V absolute maximum).
8	R5IN	input	RS-232 receiver input (internal 5kΩ pulldown, ±15kV ESD protected, ±25V absolute maximum).
9	T1OUT	output	RS-232 driver output (±15kV ESD protected, ±13.2V absolute maximum, continuous short-circuit duration).
10	T2OUT	output	RS-232 driver output (±15kV ESD protected, ±13.2V absolute maximum, continuous short-circuit duration).
11	T3OUT	output	RS-232 driver output (±15kV ESD protected, ±13.2V absolute maximum, continuous short-circuit duration).
12	T3IN	input	TTL/CMOS driver input.
13	T2IN	input	TTL/CMOS driver input.
14	T1IN	input	TTL/CMOS driver input.
15	R5OUT	output	TTL/CMOS receiver output.
16	R4OUT	output	TTL/CMOS receiver output.
17	R3OUT	output	TTL/CMOS receiver output.
18	R2OUT	output	TTL/CMOS receiver output.
19	R1OUT	output	TTL/CMOS receiver output.
20	R2OUT	output	Non-inverting receiver-2 output, active in shutdown.
21	STATUS	output	TTL/CMOS output indicating online and shutdown status; low when shut down or cable disconnected, high when external transmitters are enabled and cable connected.
22	SHUTDOWN	input	Apply logic LOW to shut down the drivers and charge pump, overriding all AUTO-ONLINE circuitry and ONLINE.
23	ONLINE	input	Apply logic HIGH to override AUTO-ONLINE circuitry keeping drivers active (SHUTDOWN must also be logic HIGH).
24	C1-	passive	Negative terminal of the voltage doubler charge-pump capacitor.
25	GND	power_in	Ground.
26	VCC	power_in	+3.0V to +5.5V supply voltage.
27	V+	power_out	Regulated +5.5V output generated by the charge pump.
28	C1+	passive	Positive terminal of the voltage doubler charge-pump capacitor.

Key specifications

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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply voltage VCC	VCC	3		5.5	V	TAMB = TMIN to TMAX, C1 - C4 = 0.1µF	8
Operating temperature range (commercial, SP3243EUCA-L/TR)	TAMB	0		70	°C	Ordering table: 0°C to 70°C, 28-pin SSOP	29
Supply voltage	VCC	-0.3		6	V		7
V+ supply voltage	V+	-0.3		7	V	Note 1: V+ and V- magnitudes up to 7V	7
V- supply voltage	V-	0.3		-7	V	Note 1: V+ and V- magnitudes up to 7V (printed as +0.3 / -7.0)	7
V+ + /V-/ absolute difference	V+ + /V-/			13	V		7
ICC DC VCC or GND current	ICC	-100		100	mA	DC VCC or GND current	7
Input voltage TxIN, ONLINE, SHUTDOWN		-0.3		6	V		7
Input voltage RxIN		-25		25	V		7
Output voltage TxOUT		-13.2		13.2	V		7
Output voltage RxOUT, STATUS		-0.3			V	Upper limit printed as VCC + 0.3 V	7
Storage temperature		-65		150	°C		7
Power dissipation per package, 28-pin SSOP				900	mW	Derate 11.2mW/°C above +70°C	7
ESD HBM (driver outputs and receiver inputs)		-15		15	kV	Human Body Model	7
ESD IEC61000-4-2 air discharge (driver outputs and receiver inputs)		-15		15	kV	Level 4	7
ESD IEC61000-4-2 contact discharge (driver outputs and receiver inputs)		-8		8	kV	Level 4	7
Supply current, AUTO-ONLINE			0.5	2	µA	All RxIN open, ONLINE = GND, SHUTDOWN = VCC, VCC = 3.3V, TAMB = 25oC, TxIN = GND or VCC	8
Supply current, shutdown			0.5	2	µA	SHUTDOWN = GND, VCC = 3.3V, TAMB = 25oC, TxIN = VCC or GND	8
Supply current, AUTO-ONLINE disabled			0.6	1	mA	ONLINE = SHUTDOWN = Vcc, no load, VCC = 3.3V, TAMB = +25oC, TxIN = GND or VCC	8
Input logic threshold Low				0.8	V	VCC = 3.3V or 5.0V, TxIN, ONLINE, SHUTDOWN	8
Input logic threshold High		2.4			V	VCC = 3.3V or 5.0V, TxIN, ONLINE, SHUTDOWN	8
Input leakage current		-1	0.01	1	µA	TAMB = +25°C, VIN = 0V to VCC	8
Output leakage current, receivers disabled		-10	0.05	10	µA	Receivers disabled, VOUT = 0V to VCC	8
Output voltage Low				0.4	V	IOUT = 1.6mA	8
Output voltage swing		-5	5.4		V	All driver outputs loaded with 3kΩ to GND, TAMB = +25oC	8
Output resistance		300			Ω	VCC = V+ = V- = 0V, VOUT = ±2V	8
Output short-circuit current		-35	60		mA	VOUT = 0V	8
Output leakage current, drivers disabled		-25		25	µA	VCC = 0V or 3.0V to 5.5V, VOUT = ±12V, drivers disabled	8
Receiver input voltage range		-15		15	V		8
Receiver input threshold Low		0.6	1.2		V	VCC = 3.3V	8
Receiver input threshold Low		0.8	1.5		V	VCC = 5.0V	8
Receiver input threshold High		1.5	2.4		V	VCC = 3.3V	8
Receiver input threshold High		1.8	2.4		V	VCC = 5.0V	8
Input resistance		3	5	7	kΩ		8
STATUS output voltage Low				0.4	V	IOUT = 1.6mA, ONLINE = GND, SHUTDOWN = VCC, 25°C	9
Receiver threshold to drivers enabled (tONLINE)	tONLINE			350	µs	Figure 20	9
Receiver positive or negative threshold to STATUS High (tSTSH)	tSTSH			0.2	µs	Figure 20	9
Receiver positive or negative threshold to STATUS Low (tSTSL)	tSTSL			30	µs	Figure 20	9
Maximum data rate (U, 1Mbps)		1000			kbps	RL = 3kΩ, CL = 250pF, one driver active	9
Receiver propagation delay tPHL	tPHL			0.15	µs	Receiver input to receiver output, CL = 150pF	9
Receiver propagation delay tPLH	tPLH			0.15	µs	Receiver input to receiver output, CL = 150pF	9
Receiver output enable time				200	ns	Normal operation	9
Receiver output disable time				200	ns	Normal operation	9
Driver skew (EH, EU)			50	100	ns	/ tPHL - tPLH /	9
Receiver skew				50	ns	/ tPHL - tPLH /	9
Transition-region slew rate (EH, EU)		90			V/µs	VCC = 3.3V, RL = 3kΩ, TAMB = 25°C, measured from -3.0V to +3.0V or +3.0V to -3.0V	9
Input hysteresis			0.3		V		8

CAD (KiCad official)

Symbol: SP3243EUCA-L
Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
3D model: SSOP-28-208mil (KiCad packages3D, STEP)
3D model files: sp3243euca-l-etched.step / sp3243euca-l-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sp3243euca-l.step / sp3243euca-l.glb are the bare package body.

Provenance

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

Datasheet: MaxLinear datasheet (30 pp, sha256 ea4b22b2d3fb360a, retrieved 2026-11-05, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

SP3243EUCA-L

Verified SP3243EUCA-L

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3D Model

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Schematic Symbol

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Datasheet

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