3.3V High Speed RS-485/RS-422 Transceivers, Advanced Fail-safe, Hot Swap Protection, ±15kV ESD-Protected

  • 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
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.

For technical support or help choosing a product please email Exar’s Serial Technical Support group at:  serialtechsupport@exar.com.
Part NumberPkg CodeRoHSMin
StatusBuy NowOrder Samples

Part Status Legend
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. 
VCC (V)3.3
No. of Tx1
No. of Rx1
Data Rate (kbps)32000
ESD (kV)15
Typ. Shutdown ICC (µA)1
Rx Fail safe OpenYes
Multi-Drop Nodes64
Technical Assets
Application Notes
Product Flyer
Product Change Notification