|Information||5V RS-485/RS-422 Half-Duplex Transceiver|
|Supported Protocols||RS-422, RS-485|
|Supply Voltage (Nom) (V)||5|
|No. of Tx||1|
|No. of Rx||1|
|Data Rate (MAX) (Mbps)||0.115|
|HBM ESD (kV)||15|
|IEC 61000-4-2 Contact (±kV)||-|
|Transient Tolerance (V)|
|Fault Tolerance (V)|
|Temperature Range (°C)||-40 to 85|
|ICC (Max) (mA)||0.9|
|Typ Shutdown Current (µA)||400|
|PROFIBUS (5V) or High Output (3V)|
The SP4082E is designed for reliable, bidirectional communication on multipoint bus transmission lines. The device contains one differential driver and one differential receiver. It is a half-duplex de- vice. The device complies with TIA/EIA-485 and TIA/EIA-422 standards. Lead-free and RoHS compliant packages are available.
This device is ruggedized for use in harsh operating conditions over the entire common-mode volt- age range from -7V to +2V. Receivers are specially designed to fail-safe to a logic high output state if the inputs are un-driven or shorted. All RS-485 bus-pins are protected against severe ESD events up to ±15kV (Human Body Model). Drivers are protected from excess current flow caused by bus contention or output short-circuits by both an internal current limit and a thermal-overload shutdown. Devices are rated for industrial (-40 to +85oC) operating temperatures. Receivers have exceptionally high input impedance, which places only /8th the standard load on a shared bus. Up to 256 transceivers may coexist while preserving full signal margin.
The device operates from a single 5.0V power supply and draws negligible quiescent power. The device has an independent enable and disable for the driver and receiver and will enter a low power shutdown mode if both driver and receiver are disabled. All outputs maintain high impedance during shutdown or when powered-off.
- 5.0V Single Supply Operation
- Controlled Driver Slew Rates 115kbps, Low EMI
- Receiver Failsafe on Open or Shorted Lines
- 1/8th Unil Load, 256 Transceivers on Bus
- Robust ESD Protection for RS-485 Pins +/-15KV Human Body Model
- Driver Short Circuit Current Limit and Thermal Shutdown for Overload Protection
- Industry Standard Package Footprints
- Motor Control
- Building Automation
- Security Systems
- Remote Meter Reading
Documentation & Design Tools
|Data Sheets||SP4082E 5V RS-485/RS-422 Transceivers 1/8th Unit Load, Slew-Rate Limited, ±15kV ESD-Protected||2.0.0||September 2022||448 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||R01||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 Flyers||5V RS-485/RS-422 Half-Duplex Transceiver||1.0.0||June 2008||147.5 KB|
|Product Brochures||Interface Brochure||November 2023||3.7 MB|
Quality & RoHS
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.