SP3243ECA-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; the charge pump runs from VCC with 0.1µF capacitors for 3.3V operation.
2	C2-	passive	Negative terminal of the inverting charge-pump capacitor; minimum recommended charge-pump capacitor values are listed in Table 7.
3	V-	power_out	Regulated -5.5V output generated by the charge pump, generated separately from VCC.
4	R1IN	input	RS-232 receiver input; RxIN is rated ±15V in the Absolute Maximum Ratings.
5	R2IN	input	RS-232 receiver input; RxIN is rated ±15V in the Absolute Maximum Ratings.
6	R3IN	input	RS-232 receiver input; RxIN is rated ±15V in the Absolute Maximum Ratings.
7	R4IN	input	RS-232 receiver input; RxIN is rated ±15V in the Absolute Maximum Ratings.
8	R5IN	input	RS-232 receiver input; RxIN is rated ±15V in the Absolute Maximum Ratings.
9	T1OUT	output	RS-232 driver output; TxOUT is rated ±13.2V in the Absolute Maximum Ratings.
10	T2OUT	output	RS-232 driver output; TxOUT is rated ±13.2V in the Absolute Maximum Ratings.
11	T3OUT	output	RS-232 driver output; TxOUT is rated ±13.2V in the Absolute Maximum Ratings.
12	T3IN	input	TTL/CMOS driver input; TxIN is rated -0.3V to 6.0V in the Absolute Maximum Ratings.
13	T2IN	input	TTL/CMOS driver input; TxIN is rated -0.3V to 6.0V in the Absolute Maximum Ratings.
14	T1IN	input	TTL/CMOS driver input; TxIN is rated -0.3V to 6.0V in the Absolute Maximum Ratings.
15	R5OUT	output	TTL/CMOS receiver output; RxOUT is rated -0.3V to VCC+0.3V in the Absolute Maximum Ratings.
16	R4OUT	output	TTL/CMOS receiver output; RxOUT is rated -0.3V to VCC+0.3V in the Absolute Maximum Ratings.
17	R3OUT	output	TTL/CMOS receiver output; RxOUT is rated -0.3V to VCC+0.3V in the Absolute Maximum Ratings.
18	R2OUT	output	TTL/CMOS receiver output; RxOUT is rated -0.3V to VCC+0.3V in the Absolute Maximum Ratings.
19	R1OUT	output	TTL/CMOS receiver output; RxOUT is rated -0.3V to VCC+0.3V in the Absolute Maximum Ratings.
20	R2OUT	output	Non-inverting receiver-2 output that remains active in shutdown; it is printed as R2OUT in the pin table, the same name as pin 18.
21	STATUS	output	TTL/CMOS output indicating online and shutdown status; it goes LOW when the device is shut down and is rated -0.3V to VCC+0.3V.
22	SHUTDOWN	input	Apply logic LOW to shut down the drivers and charge pump, overriding all AUTO ON-LINE circuitry and ONLINE; the input is rated -0.3V to 6.0V.
23	ONLINE	input	Apply logic HIGH to override AUTO ON-LINE circuitry and keep drivers active (SHUTDOWN must also be logic HIGH); the input is rated -0.3V to 6.0V.
24	C1-	passive	Negative terminal of the voltage doubler charge-pump capacitor.
25	GND	power_in	Ground reference for the device.
26	VCC	power_in	Supply voltage of +3.0V to +5.5V; VCC is rated -0.3V to 6.0V in the Absolute Maximum Ratings.
27	V+	power_out	Regulated +5.5V output generated by the charge pump; V+ is rated -0.3V to 7.0V in the Absolute Maximum Ratings.
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 (absolute maximum)	VCC	-0.3		6	V		7
V+ supply (absolute maximum)	V+	-0.3		7	V		7
V- supply (absolute maximum)	V-	0.3		-7	V		7
V+ + /V-/ (absolute maximum)	V+ + /V-/			13	V		7
DC VCC or GND current (absolute maximum)	ICC	-100		100	mA		7
Input voltage TxIN, ONLINE, SHUTDOWN (absolute maximum)		-0.3		6	V		7
Input voltage RxIN (absolute maximum)		-15		15	V		7
Output voltage TxOUT (absolute maximum)		-13.2		13.2	V		7
Output voltage RxOUT, STATUS (absolute maximum)		-0.3			V		7
Storage temperature (absolute maximum)		-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	IEC61000-4-2 Air Discharge, level 4	7
ESD IEC61000-4-2 contact discharge, driver outputs and receiver inputs		-8		8	kV	IEC61000-4-2 Contact Discharge, level 4	7
Supply voltage VCC (operating range)	VCC	3		5.5	V	TAMB = TMIN to TMAX, C1 - C4 = 0.1µF	8
Supply current, AUTO ON-LINE			1	10	µA	All RxIN open, ONLINE = GND, SHUTDOWN = VCC, VCC = 3.3V, TAMB = 25oC, TxIN = GND or VCC	8
Supply current, shutdown			1	10	µA	SHUTDOWN = GND, VCC = 3.3V, TAMB = 25oC, TxIN = VCC or GND	8
Supply current, AUTO ON-LINE disabled			0.3	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	TxIN, ONLINE, SHUTDOWN, TAMB = +25°C, VIN = 0V to VCC	8
Output leakage current (receivers)		-10	0.05	10	µA	Receivers disabled, VOUT = 0V to VCC	8
Output voltage Low (RxOUT)				0.4	V	IOUT = 1.6mA	8
Driver output voltage swing		-5	5.4		V	All driver outputs loaded with 3kΩ to GND, TAMB = +25oC	8
Driver output resistance		300			Ω	VCC = V+ = V- = 0V, VOUT = +2V	8
Driver output short-circuit current		-35	60		mA	VOUT = 0V	8
Driver 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, VCC = 3.3V		0.6		1.2	V	VCC = 3.3V	8
Receiver input threshold High, VCC = 3.3V		1.5		2.4	V	VCC = 3.3V	8
Receiver input threshold Low, VCC = 5.0V		0.8		1.5	V	VCC = 5.0V	8
Receiver input threshold High, VCC = 5.0V		1.8		2.4	V	VCC = 5.0V	8
Receiver input resistance		3	5	7	kΩ		8
STATUS output voltage Low				0.4	V	IOUT = 1.6mA	9
Receiver threshold to drivers enabled	tONLINE			350	µs	Figure 19	9
Receiver positive or negative threshold to STATUS High	tSTSH			0.2	µs	Figure 19	9
Receiver positive or negative threshold to STATUS Low	tSTSL			30	µs	Figure 19	9
Maximum data rate (120 kbps variant)		120			kbps	RL = 3kΩ, CL = 1000pF, 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		9
Receiver output enable time				200	ns	Normal operation	9
Receiver output disable time				200	ns	Normal operation	9
Driver skew (E, EB)	/ tPHL - tPLH /		100	500	ns		9
Receiver skew	/ tPHL - tPLH /			50	ns		9
Transition-region slew rate (E, EB)		6		30	V/µs		9

CAD (KiCad official)

Symbol: SP3243ECA-L
Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
3D model: SSOP-28-208mil (KiCad packages3D, STEP)
3D model files: sp3243eca-l-etched.step / sp3243eca-l-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sp3243eca-l.step / sp3243eca-l.glb are the bare package body.

Provenance

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

Datasheet: MaxLinear datasheet (30 pp, sha256 3ad9f6144fdcd49d, retrieved 2026-10-30, 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

SP3243ECA-L

Verified SP3243ECA-L

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3D Model

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