RS232 and RS485 Protection
Highlights:
- RS-485 – Industry standard protocol for data transfer from sensors, etc.
- Drive capability of minimum 32 unit loads (UL, 12kΩ)
- Uses two signal lines A & B which must be balanced and differential
- Runs on an I/O common-mode range: -7V to +12V, this requires the minimum breakdown voltage to be > 13.3V
- Load capacitance requirements as per RS 485 standards <30pF
- RS-485 lines being heavily used in outdoor signaling also require a surge protection.
|
TI Products Recommendations |
Working Voltage (V) |
IEC 61000-4-2 ESD Rating (kV) (Contact) |
Capacitance (pF) |
Channel count |
Package Size (mm) |
Package |
Recommended for |
|
±12 |
30 |
9.5 |
2 |
2.92 x 1.3 |
SOT-23 |
Differential signal pairs with surge protection |
|
|
±12 |
22 |
1.5 |
2 |
2.92 x 1.3 |
SOT-23 |
Low-cost differential signal pairs |
|
|
±24 |
30 |
3 |
2 |
2.92 x 1.3 |
SOT-23 |
Systems with higher voltage clamping |
< Related Threads>
