ST3085B 5V 250kbps ±18kV ESD Low-Power High-ESD-Protected RS-485 Transceiver
Specifications
Product details
Overview
The ST3085B is a +5V low-power, high-ESD-protected half-duplex RS-485 transceiver integrating one driver and one receiver. Its typical supply current is only 150µA, combining low power consumption with ±18kV IEC 61000-4-2 contact-discharge ESD protection on the I/O bus pins — ideal for industrial bus applications demanding both power efficiency and rugged ESD immunity. Fail-safe circuitry keeps the receiver output logic-high when the receiver inputs are open or shorted, even if every transmitter on a terminated bus is disabled. The reduced-slew-rate driver minimizes EMI and reflections caused by improperly terminated cables, enabling error-free data transmission up to 250kbps. With a 1/8 unit-load receiver input impedance, up to 256 transceivers can share a single bus for half-duplex communication. Offered in an SOP-8 package over a -40~+85℃ operating temperature range, the ST3085B provides a low-power, highly protected RS-485 interface for industrial control LANs, energy meter networks and lighting systems.
Features
- Single +5V supply operation
- Low supply current: 150µA typical, less than 10µA in shutdown mode
- True fail-safe receiver: logic-high output on open/shorted inputs
- Max data rate: 250kbps
- Reduced-slew-rate driver minimizes EMI and cable reflections
- 1/8 unit-load input impedance allows up to 256 transceivers on the bus
- I/O bus pin ESD protection: ±18kV IEC 61000-4-2 contact discharge
- SOP-8 package
Typical Applications
- RS-485 communications
- Level translators
- Transceivers for EMI-sensitive applications
- Industrial control local area networks
- Energy meter networks
- Lighting systems
