Standard-compliant RS-485 transceivers for reliability in noisy industrial environments

The robust STMicroelectronics ST4E1240 and ST4E1216 transceiver ICs are ideal for factory automation equipment, industrial robots and telecoms infrastructure due to high signal integrity and integrated ESD protection.

The ST4E1240 and ST4E1216 from STMicroelectronics are low-power, differential line transceivers for half-duplex RS-485 transmissions which are ideal for multi-point applications over extended cable runs. 

With the ST4E1240, STMicroelectronics has extended the capability of its portfolio of RS‑485 transceivers to cover data-transfer requirements up to a maximum speed of 40 Mbits/s. The ST4E1216 data rate is up to 16 Mbits/s. Both transceivers are tolerant of high transient ESD voltages, the bus pins withstand contact discharges of up ±12 kV. 

Using the ST4E1240 or ST4E1216, equipment designers can configure a bus network with more than 64 transceivers, and up to 100 nodes. Compatible with PROFIBUS network requirements, the differential output voltage exceeds 2.1 V at a 5 V supply. The ST4E1240 and ST4E1216 also meet or exceed the requirements of the TIA/EIA-485A standard. 

Both transceivers are supplied in a standard SO-8 package with a 4.9 mm x 3.9 mm footprint. The ST4E1216 operates over a temperature range of -40°C to 125°C, and the ST4E1240 from -40°C to 85°C.

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