|Information||Enhanced Low EMI Half-Duplex RS-485 Transceiver|
|Supported Protocols||RS-422, RS-485|
|Supply Voltage (Nom) (V)||5|
|No. of Tx||1|
|No. of Rx||1|
|HBM ESD (kV)||15|
|IEC 61000-4-2 Contact (±kV)||8|
|Fault Tolerance (V)|
|Temperature Range (°C)||0 to 70, -40 to 85,-40 to 125|
|Data Rate (MAX) (Mbps)||10|
|Transient Tolerance (V)|
|ICC (Max) (mA)||-|
|Typ Shutdown Current (µA)|
|PROFIBUS (5V) or High Output (3V)|
The SP481E and SP485E are a family of half-duplex transceivers that meet
the specifications of RS-485 and RS-422 serial protocols with enhanced
ESD performance. The ESD tolerance has been improved on these devices to
over +15kV for both Human Body Model and IEC1000-4-2 Air Discharge
Method. These devices are pin-to-pin compatible with Exar's SP481 and
SP485 devices as well as popular industry standards. As with the
original versions, the SP481E and SP485E feature Exar's BiCMOS design
allowing low power operation without sacrificing performance. The SP481E
and SP485E meet the requirements of the RS-485 and RS-422 protocols up
to 10Mbps under load. The SP481E is equipped with a low power shutdown
- +5V Only
- Low Power BiCMOS
- Driver/Receiver Enable for Multi-Drop configurations
- Enhanced ESD Specifications:
- ±15KV Human Body Model
- ±15KV IEC1000-4-2 Air Discharge
Documentation & Design Tools
|Data Sheets||SP481E / SP485E Enhanced Low Power Half-Duplex RS-485 Transceivers||1.0.6||March 2022||482.3 KB|
|Application Notes||DAN-190, MaxLinear UARTs in RS-485 Applications||2||December 2022||2.3 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||AN-291, RS-485 Advanced Fail-Safe Feature||00||January 2022||920.5 KB|
|Application Notes||ANI-13, RS-485 and RS-422 Physical Topologies||D||December 2006||183.2 KB|
|Product Flyers||Power Management & Interface Products for Cable, Satellite and IP STB/Home Gateway||March 2018||2 MB|
|Product Brochures||Interface Brochure||October 2022||3.8 MB|
Quality & RoHS
|Part Number||RoHS | Exempt||RoHS||Halogen Free||REACH||TSCA||MSL Rating / Peak Reflow||Package|
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.
The SP485E offers enhanced ESD protection on RS-485 I/O lines (Driver output / Receiver input) up to ±15KV. The SP485 part does not offer this enhanced ESD protection level. All other electrical parameters are the same between each part.