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The ST485A is a low power, high speed transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST485A draws 3 mA (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5 V supply.
Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that place the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic high output if both inputs are open circuit.
The ST485A is designed for bi-directional data communications or multipoint bus transmission lines.Key Features
- Latch-up free up to 500 mA
- Current limiting and thermal shutdown for driver overload protection
- Operate from single 5 supply
- 70mV typical input hysteresis
- Low supply current: 5 mA max
- Designed for RS 485 interface applications
- High data rate > 30 Mbps
- Driver maintains high impedance in 3-state or with the power off
- ±4 kV ESD protection
- -7 to 12 common mode input voltage range
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| ST485ABDR |
Active
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SO-8 | Industrial | Ecopack3 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Autoshutdown | Country of Origin | Budgetary Price (US$)*/Qty | More info | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||
| ST485ABDR | 6 distributors | Buy now |
Active
|
EAR99 | NEC | Tape And Reel | SO-8 | -40 | 85 | - | MOROCCO | 0.82 / 1k | ||
(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors
