RS485 Transceiver


WT3485/WT485 is a 3.3V/5V power supply, half-duplex, low power, low slew rate RS485 Transceiver. They Fully meets the TIA/EIA-485 standard. WT3485/WT485 includes a driver and a receiver, both of which can be independently enabled and disabled. When both are disabled, the driver and receiver outputs are high-impedance state. WT3485/WT485 has a 1/8-unit-load receiver input impedance, that allows up to 256 transceivers on the bus. The WT3485/WT485 features reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 12/1Mbps.

* 3.3V/5V Power Supply, Half-duplex
* 1/8-unit-load, allows up to 256 transceivers on the bus
* Short-circuit protection
* Thermal shutdown protection
* Low-Current Shutdown Mode
* Hot-Swap Input Structures on DE and /RE
* True Fail-Safe Receiver
* Excellent noise immunity
* Integrated transient voltage suppression
* 12/1Mbps in Electrically Noisy Environments
* ESD Protection for Bus Terminals:
* Contact Discharge±16KV,HBM±16KV

RS485 Transceiver

Part No Supply Voltage(V) Differential Driver Output (R=54Ω)(V) Driver Common-mode Output (R=54Ω)(V) Receiver Positive-going input threshold voltagee(mV) Receiver Negative-going input threshold voltagee(mV) ESD(HBM)A/B (KV) ESD(HBM)(OTHER PINS) (KV) True Fail-Safe Receiver Nodes Data transmission (Mbps) Transmission Mode Package Data sheet
WT3485 3.3 1.5~VCC 3 (MAX) 200 (MAX) -200 (MIN) ±4 ±4 YES 256 12 Half-duplex SOP8, MSOP8, DIP8
WT485 5.0 1.5~VCC 3 (MAX) -50 (MAX) -200 (MIN) ±16 ±6 YES 256 1.0 Half-duplex SOP8, DIP8