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sp3243eea-l

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by Ray

MaxLinear RS232 ICs, SSOP-28-208mil. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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SP3243EEA-L

MaxLinear · RS232 ICs · SSOP-28-208mil

SP3243EEA-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). Connect a 0.1uF ceramic cap between C2+ and C2-.
2 C2- passive Negative terminal of the inverting charge-pump flying capacitor (C2). Connect a 0.1uF ceramic cap between C2+ and C2-.
3 V- power_out Regulated -5.5V negative rail generated by the internal charge pump. Bypass to GND with a 0.1uF cap. Sourced from the inverting stage of the four-phase charge pump.
4 R1IN input RS-232 receiver 1 input. Accepts +/-15V EIA/TIA-232 line levels; typ. 5kOhm input impedance with ~300mV hysteresis. Internal 5kOhm pulldown commits output HIGH when input is left open.
5 R2IN input RS-232 receiver 2 input. Accepts +/-15V EIA/TIA-232 line levels; typ. 5kOhm input impedance. Feeds the always-active complementary receiver output R2OUTB used for Ring-Indicator monitoring during shutdown.
6 R3IN input RS-232 receiver 3 input. Accepts +/-15V EIA/TIA-232 line levels; typ. 5kOhm input impedance with ~300mV hysteresis.
7 R4IN input RS-232 receiver 4 input. Accepts +/-15V EIA/TIA-232 line levels; typ. 5kOhm input impedance.
8 R5IN input RS-232 receiver 5 input. Accepts +/-15V EIA/TIA-232 line levels; typ. 5kOhm input impedance.
9 T1OUT output RS-232 driver 1 output. Swings ~+/-5.4V (min +/-5.0V) into a 3kOhm load; short-circuit and continuous-fault protected. Guarantees 120kbps into 3kOhm
10 T2OUT output RS-232 driver 2 output. Swings ~+/-5.4V (min +/-5.0V) into a 3kOhm load; short-circuit protected.
11 T3OUT output RS-232 driver 3 output. Swings ~+/-5.4V (min +/-5.0V) into a 3kOhm load; short-circuit protected.
12 T3IN input TTL/CMOS driver 3 input. VIL max 0.8V, VIH min 2.0V. Unused driver inputs should be tied to GND or VCC.
13 T2IN input TTL/CMOS driver 2 input. VIL max 0.8V, VIH min 2.0V. Unused driver inputs should be tied to GND or VCC.
14 T1IN input TTL/CMOS driver 1 input. VIL max 0.8V, VIH min 2.0V. Unused driver inputs should be tied to GND or VCC.
15 R5OUT output TTL/CMOS receiver 5 output (inverting). VOL <=0.4V @ 1.6mA sink; VOH >= VCC-0.6V @ 1mA source. Goes high-Z when receivers are disabled.
16 R4OUT output TTL/CMOS receiver 4 output (inverting). VOL <=0.4V @ 1.6mA sink; VOH >= VCC-0.6V @ 1mA source.
17 R3OUT output TTL/CMOS receiver 3 output (inverting). VOL <=0.4V @ 1.6mA sink; VOH >= VCC-0.6V @ 1mA source.
18 R2OUT output TTL/CMOS receiver 2 output (inverting). VOL <=0.4V @ 1.6mA sink; VOH >= VCC-0.6V @ 1mA source. Goes high-Z in shutdown.
19 R1OUT output TTL/CMOS receiver 1 output (inverting). VOL <=0.4V @ 1.6mA sink; VOH >= VCC-0.6V @ 1mA source.
20 R2OUTB output Non-inverting receiver-2 output that remains ACTIVE in shutdown. Intended for monitoring the Ring Indicator (RI) line while the rest of the device is powered down.
21 STATUS output Active-low TTL/CMOS status output indicating online / shutdown state. LOW when the device is shut down or receivers are inactive; HIGH when transmitters are enabled and cable activity is detected. Also usable as a DTR / Ring Indicator status flag.
22 SHUTDOWN input Active-low shutdown input. Driving LOW disables drivers and the charge pump (~1uA supply) and overrides both AUTO ON-LINE and ONLINE. Drive HIGH for normal operation.
23 ONLINE input Active-low AUTO ON-LINE override input. Tie LOW to enable AUTO ON-LINE circuitry (auto wake on cable activity). Drive HIGH to force drivers on regardless of receiver activity (SHUTDOWN must also be HIGH). See Table 3 for logic.
24 C1- passive Negative terminal of the voltage-doubler charge-pump flying capacitor (C1). Connect a 0.1uF ceramic cap between C1+ and C1-.
25 GND power_in Device ground (0V) reference for logic and charge-pump return.
26 VCC power_in +3.0V to +5.5V main supply input. Bypass to GND with 0.1uF ceramic close to the pin.
27 V+ power_out Regulated +5.5V positive rail generated by the internal charge pump. Bypass to GND with a 0.1uF cap.
28 C1+ passive Positive terminal of the voltage-doubler charge-pump flying capacitor (C1). Connect a 0.1uF ceramic cap between C1+ and C1-.

Key specifications

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

Ordering variants

  • SP3243EEA-L
  • SP3243EEA-LECT
  • SP3243EEA-LEET

CAD (KiCad official)

  • Symbol: SP3243EEA-L
  • Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
  • 3D model: SSOP-28-208mil (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
sp3243eea-l.step 362 KB You want the bare part, or you mark your own boards.
sp3243eea-l-etched.step 3.1 MB You want the part with SP3243EEA-L already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 791 faces against 447 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 (24 pp, sha256 d1be0b655ad4a8c0, 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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