|Information||3.3V High Speed RS-485/RS-422 Transceivers, Advanced Fail-safe, Hot Swap Protection, ±15kV ESD-Protected|
|Supported Protocols||RS-422, RS-485|
|Supply Voltage (Nom) (V)||3.3|
|No. of Tx||1|
|No. of Rx||1|
|Data Rate (MAX) (Mbps)||32|
|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)||5|
|Typ Shutdown Current (µA)||1|
|PROFIBUS (5V) or High Output (3V)|
The SP3495E - SP3497E transceivers are suitable for high speed bidirectional communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with both RS-485 and RS-422 EIA standards. Each device contains one differential driver and one differential receiver.
Driver differential outputs and receiver differential inputs are connected internally to form a half-duplex input/output to the RS-485 bus. Separate RE and DE pins enable and disable the driver and receiver independently or may be externally connected together as a direct control. The device enters a low power shutdown mode if both driver and receiver are disabled. the bus-pin outputs of disabled or powered down devices are in high impedance state. The high impedance driver output is maintained over the entire common-mode voltage range of -7V to +12V.
SP3495E - SP3497E operates from a single 3.3V power supply. SP3495E - SP3497E transceivers load the data bus only half as much as a standard RS-485 unit load. This allows up to 64 devices to be connected simultaneously on a bus without violating required RS-485 signal margin and without using repeaters. Excessive power dissipation caused by bus contention or by shorting outputs to ground or a voltage source is prevented by short circuit protection and thermal shutdown. This feature forces the driver output into high impedance state if the absolute value of the output current exceeds 250mA or if junction temperature exceeds 165°C. Receivers will fail-safe to a logic high output state if the inputs are unconnected (floating) or shorted. All RS-485 inputs and outputs are ESD protected up to +/-15kV Human Body Model.
- Full Duplex RS-485 Transceiver
- 3.3V Single Supply Operation
- High Speed Date Rate – 32Mbps
- Receiver fail-safe on open, short or terminated lines
- 1/2 Unit Load, 64 transceivers on bus
- Hot Swap glitch protection on control inputs
- Driver short circuit current limit and thermal shutdown for overload protection
- 1µA shutdown mode
- Industry standard package footprints
- Robust ESD Specifications:
- ±15KV Human Body Model
- Factory Automation Controls
- Motor Control
- Industrial Process Control
- Building Automation
- Security Systems
- Remote Utility Meter Reading
- Long or un-terminated transmission lines
Documentation & Design Tools
|Data Sheets||SP3495E-3497E High Speed +3.3V RS-485/RS-422 Transceivers with +/-15KV ESD Protection and Advanced Failsafe||1.0.0||May 2009||479.7 KB|
|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||November 2023||3.7 MB|
Parts & Purchasing
|Part Number||Pkg Code||Min Temp||Max Temp||Status||Suggested Replacement||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
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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.