|Information||High Speed Intelligent +3.0V to +5.5V RS-232 Transceiver|
|Supply Voltage (Nom) (V)||3.3, 5|
|No. of Tx||3|
|No. of Rx||5|
|HBM ESD (kV)||15|
|IEC 61000-4-2 Contact (±kV)||8|
|Package||SSOP-28, QFN-32, TSSOP-28|
|Data Rate (kbps)||1000|
|Temperature Range (°C)||0 to 70, -40 to 85|
|Int. Charge Pump||✔|
|No. of Ext Caps||4|
|Nom Cap Value (µF)||0.1|
The SP3243E products are 3 driver/5 receiver RS-232 transceiver solutions intended for portable or hand-held applications such as notebook and palmtop computers. The SP3243E includes one complementary receiver that remains alert to monitor an external device's Ring Indicate signal while the device is shutdown. The SP3243E and EB devices feature slew-rate limited outputs for reduced crosstalk and EMI. The "U" and "H" series are optimized for high speed with data rates up to 1Mbps, easily meeting the demands of high speed RS-232 applications. The SP3243E series uses an internal high-efficiency, charge-pump power supply that requires only 0.1μF capacitors in 3.3V operation. This charge pump and MaxLinear's driver architecture allow the SP3243E series to deliver compliant RS-232 performance from a single power supply ranging from +3.0V to +5.5V. The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise, the device automatically shuts itself down drawing less than 1μA.
- Meets true EIA/TIA-232-F Standards from a +3.0V to +5.5V power supply
- ±15kV ESD protection
- 1Mbps Data rate
- AUTO ON-LINE® circuitry automatically wakes up from a 1µA shutdown
- Regulated Charge Pump Yields Stable RS-232 Outputs Regardless of VCC Variations
- Enhanced ESD Specifications:
- ±15kV Human Body Model
- ±15kV IEC1000-4-2 Air Discharge
- ±8kV IEC1000-4-2 Contact Discharge
- 250 Kbps min. transmission rate (EB)
- 1000 Kbps min. transmission rate (EU)
- Ideal for High Speed RS-232 Applications
Documentation & Design Tools
|Data Sheets||SP3243E 3 Driver / 5 Receiver Intelligent +3.0V to +5.5V RS-232 Transceivers||1.0.4||December 2021||407.1 KB|
|Application Notes||ANI-10, Charge Pump Capacitor Selection Guide for 3V RS-232 Products||B||December 2006||71.8 KB|
|Application Notes||ANI-15, Upgrade from the 3241 to SP3243E||B||December 2006||51.8 KB|
|Product Brochures||Interface Brochure||October 2019||1.3 MB|
Quality & RoHS
|Part Number||RoHS | Exempt||RoHS||Halogen Free||REACH||TSCA||MSL Rating / Peak Reflow||Package|
|SP3243EUER-L/TR||N||Y||Y||Y||Y||L2 / 260ᵒC||QFN32 5x5 OPT1|
|SP3243EUCA-L/TR||N||Y||Y||Y||Y||L2 / 260ᵒC||SSOP28|
|SP3243EUEA-L/TR||N||Y||Y||Y||Y||L2 / 260ᵒC||SSOP28|
|SP3243EUCY-L/TR||N||Y||Y||Y||Y||L1 / 260ᵒC||TSSOP28|
|SP3243EUEY-L/TR||N||Y||Y||Y||Y||L1 / 260ᵒC||TSSOP28|
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Parts & Purchasing
|Part Number||Pkg Code||Min Temp||Max Temp||Status||Suggested Replacement||Buy Now||Order Samples||PDN|
|SP3243EUCR-L||QFN32 5x5 OPT1||0||70||OBS||SP3243EUER-L/TR|
|SP3243EUCR-L/TR||QFN32 5x5 OPT1||0||70||OBS||SP3243EUER-L/TR|
|SP3243EUER-L||QFN32 5x5 OPT1||-40||85||OBS||SP3243EUER-L/TR|
|SP3243EUER-L/TR||QFN32 5x5 OPT1||-40||85||Active||Order|
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
FAQs & Support
Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.
Submit a Technical Support Question As a New Question
For RS-232 it is 50 feet (15 meters), or the cable length equal to a capacitance of 2500 pF, at a maximum transmission rate of 19.2kbps. When we reduce the baud rate, it allows for longer cable length. For Example:
Baud Rate (bps)
Maximum RS-232 Cable Length (ft)
In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result. This brings you to the product page. For example:
Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:
Notice the status column and the “Show obsolete parts” link. A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:
Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:
And then Product Change Notifications:
Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:
If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.