|Information||3.3V Slew Limited RS-485/RS-422, 2.5Mbps Half-Duplex|
|Supported Protocols||RS-422, RS-485|
|Supply Voltage (Nom) (V)||3.3|
|No. of Tx||1|
|No. of Rx||1|
|Data Rate (MAX) (Mbps)||2.5|
|HBM ESD (kV)||2|
|IEC 61000-4-2 Contact (±kV)||-|
|Transient Tolerance (V)|
|Fault Tolerance (V)|
|Temperature Range (°C)||0 to 70, -40 to 85|
|ICC (Max) (mA)||2|
|Typ Shutdown Current (µA)||10|
|PROFIBUS (5V) or High Output (3V)|
The SP3494 device is a +3.3V low power half-duplex transceiver that meets the specifications of the RS-485 and RS-422 serial protocols. This device is pin-to-pin compatible with the MaxLinear SP481E and other popular industry standard devices. The SP3494 features the Exar BiCMOS process, allowing low power operation without sacrificing performance. The partially slew-rate limited drivers minimize EMI and reduce reflections caused by improperly terminated cables allowing error-free data transmission.The SP3494 is a half-duplex partially slew-rate limited transceiver that will deliver a data transmission rate up to 2.5Mbps. The SP3494 is equipped with a low-power shutdown mode and driver/receiver high-Z enable lines.
- Operates From A Single +3.3V Supply
- Interoperable With +5V Logic
- ±200mV Receiver Input Sensitivity
- -7V to +12V Common-Mode Input Voltage Range
- Devices Allow Up To 32 Transceivers On The Serial Bus
- Driver/Receiver Enable Lines
- 2nA Low-Power Shutdown Mode
- Pin compatible with MaxLinear SP481E and other popular Industry Standard devices
Documentation & Design Tools
|Data Sheets||SP3494 +3.3V Low Power RS-485/RS-422 Transceiver||1.0.2||March 2019||922.4 KB|
|Application Notes||DAN-190, MaxLinear UARTs in RS-485 Applications||R01||July 2023||2.4 MB|
|Application Notes||AN-291, RS-485 Advanced Fail-Safe Feature||01||May 2023||3.7 MB|
|Application Notes||RS-232 and RS-485 PCB Layout Application Note||R00||December 2022||2.8 MB|
|Application Notes||AN-292, RS-485 Cable Lengths vs Data Signaling Rate||R01||July 2022||2.7 MB|
|Application Notes||ANI-13, RS-485 and RS-422 Physical Topologies||D||December 2006||183.2 KB|
|Product Brochures||Interface Brochure||June 2023||3.7 MB|
|Product FAQs||SP3494 FAQ||1.0.0||March 2007||164.4 KB|
Quality & RoHS
|Part Number||RoHS | Exempt||RoHS||Halogen Free||REACH||TSCA||MSL Rating / Peak Reflow||Package|
|SP3494CN-L/TR||N||Y||Y||Y||Y||L1 / 260ᵒC||NSOIC8|
|SP3494EN-L||N||Y||Y||Y||Y||L1 / 260ᵒC||NSOIC8|
|SP3494EN-L/TR||N||Y||Y||Y||Y||L1 / 260ᵒC||NSOIC8|
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|
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)
Fail Safe is an attempt to keep the output of the RS-485 receiver to a known state. Transceivers may have standard fail safe or advanced / enhanced receiver fail safe features. Standard fail safe supports open inputs while enhanced fail safe transceivers such as the SP339 and XR34350 support open input, shorted input and undriven terminated lines without external biasing. See Application Note ANI-22 for more detail.
The Parts & Purchasing section of the product page shows the Status of all orderable part numbers for that product. Click Show obsolete parts, to see all EOL or OBS products.