|Information||High Speed, 3.3V, 15kV, Failsafe RS-485/RS-422 Half-Duplex|
|Supported Protocols||RS-422, RS-485|
|Supply Voltage (Nom) (V)||3.3|
|No. of Tx||1|
|No. of Rx||1|
|HBM ESD (kV)||15|
|IEC 61000-4-2 Contact (±kV)||8|
|Temperature Range (°C)||-40 to 85,-40 to 125|
|Data Rate (MAX) (Mbps)||16|
|ICC (Max) (mA)||1.5|
|Typ Shutdown Current (µA)||0.5|
|PROFIBUS (5V) or High Output (3V)|
The SP3070E-3078E differential line transceivers are suitable for bidirectional communication on balanced multipoint bus transmission lines and comply with both RS485 and RS422 EIA Standards. Each device consists of a differential driver and differential receiver. All devices operate from a 3.3V power supply.
High receiver input impedance allows a large number of transceivers to share a common data bus while maintaining signal margin and without excessive loading or use of expensive repeaters. The high impedance driver output is maintained over the entire common-mode voltage range from -7 to +12V. Receivers will failsafe to logic 1 output when inputs are open, shorted or terminated. Drivers include built-in short-circuit protection and a thermal-overload shutdown to protect against excessive power dissipation from bus contention or cable faults. All RS485 receiver inputs and driver outputs are ESD protected up to ±15kV (Air-Gap and Human Body Model) and up to ±8kV Contact discharge (IEC 1000-4-2).
- ±15kV ESD protection for RS485 pins
- 3.3V low-power operation
- Advanced receiver-failsafe protection for open, shorted or terminated lines
- Up to 256 Transceivers may share bus
- Very low load for 8x greater fan-out
- Hot Swap glitch protection RE and DE
- Thermal shutdown protects against driver contention
- Available in three industry standard footprints
- SP3070E, SP3073E and SP3076E in Full-Duplex (14 pin)
- SP3071E, SP3074E and SP3077E in Full-Duplex (8 pin)
- SP3072E, SP3075E and SP3078E in Half-Duplex (8 pin)
- Three applications-optimized speed grades
- SP3070-72E: 250kbps fully slew-limited
- SP3073-75E: 500kbps slew-limited
- SP3076-78E: 16Mbps high speed
- Small form factor SO-narrow packages
- Industrial (-40 to +85ºC) & Extended (-40 to +85ºC) temperature grades
Documentation & Design Tools
|Data Sheets||SP3070E - SP3078E Family ±15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers||1.0.3||March 2020||358.8 KB|
|Application Notes||AN-292, RS-485 Cable Lengths vs Data Signaling Rate||R00||May 2022||2.7 MB|
|Application Notes||AN-291, RS-485 Advanced Fail-Safe Feature||00||January 2022||920.5 KB|
|Application Notes||DAN-190, MaxLinear UARTs in RS-485 Applications||1.0.0||April 2008||147.3 KB|
|Application Notes||ANI-21, SP3070E-SP3078E Guidelines for Failsafe Biasing when Applied in Multi-Voltage Networks||D||May 2007||123.6 KB|
|Application Notes||ANI-13, RS-485 and RS-422 Physical Topologies||D||December 2006||183.2 KB|
|Application Notes||ANI-20, Advanced Features of the SP3070E-SP3078E and SP3080E- SP3088E High Performance RS-485 Transceivers||K||October 2006||615.7 KB|
|Design Solutions||DS-27, Signal Routing Considerations for 80-Pin Multiprotocol Communications Interface Devices||November 2007||246.6 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|
|SP3078EEN-L||N||Y||Y||Y||Y||L1 / 260ᵒC||NSOIC8|
|SP3078EEN-L/TR||N||Y||Y||Y||Y||L1 / 260ᵒC||NSOIC8|
|SP3078EMN-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.
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.