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


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.

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  • 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

Design Tools

Technical Library


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MS-012
  • MSL Pb-Free: L2 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 88.2ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 2500
  • Quantity per Tube: 56
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 8
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 8.65
  • Width: 3.90
  • Thickness: 1.65 max
  • Lead Pitch: 1.27

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
SP3497EEN-L NSOIC14 -40 85 EOL
SP3497EEN-L/TR NSOIC14 -40 85 EOL
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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.
Distribution Date Description File
07/11/2017 Product Discontinuation Notification PDN_17-0623-01-1033.pdf
07/11/2017 Product Discontinuation Notification PDN_17-0626-02-1033.pdf
02/23/2017 Qualification of alternate assembly subcon, ANST, China. PCN 16-1149-02-01 ANST-1033.pdf
08/12/2016 Addition of an alternate qualified location, JCET, for assembly using copper wire bonding. PCN 16-0522-03 JCET-1033.pdf
03/30/2016 Alternate foundry. Addition of an alternate foundry, Silan. PCN 16-0105-02 Silan-1033.pdf