Product Detail
- Product: CAN Bus / RS485 TVS diode.
- Packages: SMBJ, SOT, arrays.
- Focus: differential lines.
- Use case: field buses.
Product Description
This CAN Bus / RS485 TVS diode page is for industrial communication lines that leave the board and run through cabinets, machines or long field wiring. You can compare SMBJ24CA, SMBJ36CA, PESD CAN bus arrays and RS485 protectors by standoff voltage, capacitance, bidirectional behavior, package, line-to-line placement and return path. Differential buses need protection that respects signal swing and common-mode stress. Lian Tuo helps you match the TVS to the bus environment before failures show up as communication drops in the field. That keeps the bus protection tied to the real field wiring.
Our CAN Bus / RS485 TVS Diode Options
| CAN Bus TVS Diode | Protection choice for vehicle, battery and industrial CAN lines exposed to cable transients. |
| RS485 TVS Diode | Bidirectional protection for balanced serial lines in meters, controls and building systems. |
| SMBJ24CA Bus TVS Diode | Common 24V-class direction for industrial communication and control wiring entrances. |
| SMBJ36CA Bus TVS Diode | Higher standoff option when bus tolerance and field conditions need more margin. |
| PESD CAN Bus Array | Compact multi-line package for dense boards and connector-side ESD protection. |
Feature Box
- Differential FitProtection is selected around balanced line behavior.
- Bidirectional ClampCA-style options handle transients in both directions.
- Field WiringLong cable exposure and cabinet entry points are reviewed.
- Package ChoiceSMBJ and compact arrays cover different layouts.
Respect Differential Lines
A CAN Bus / RS485 TVS diode should protect the pair without unbalancing the signal path. Trace symmetry, line-to-line placement and the connector return point matter. If the TVS is placed poorly, the bus may still work on the bench but become unreliable in a noisy cabinet. It also helps avoid communication faults after the board leaves the bench.
Match Standoff To Bus
Industrial buses can carry normal voltage swings and common-mode offsets that low-voltage ESD parts may not tolerate. A CAN Bus / RS485 TVS diode should be selected by standoff voltage, breakdown range and clamping behavior. The bus should stay quiet during normal communication. That keeps the bus protection tied to the real field wiring.
Plan The Return Path
Surge current on field wiring needs a short return path away from the transceiver. The CAN Bus / RS485 TVS diode package, ground connection and connector placement should be reviewed together. Good protection is often more about layout than choosing the biggest part. It also helps avoid communication faults after the board leaves the bench.
Keep Field Service Simple
Maintenance teams often replace communication protection after cable faults or lightning nearby. Lian Tuo can compare CAN Bus / RS485 TVS diode markings, voltage classes and package photos so service stock matches the installed network instead of creating new communication issues. That keeps the bus protection tied to the real field wiring.
Vertical Product Applications
Factory Sensor Networks
Use a CAN Bus / RS485 TVS diode on factory sensor networks where long cables run near motors, relays or power wiring. The part should match bus voltage and connector grounding so communication stays stable in noisy locations. It also helps avoid communication faults after the board leaves the bench. That keeps the bus protection tied to the real field wiring.
Building Automation Lines
Building automation controllers often use RS485 over long cable runs. A CAN Bus / RS485 TVS diode helps protect the balanced pair from field transients while keeping capacitance and common-mode behavior within the network requirement. That keeps the bus protection tied to the real field wiring. It also helps avoid communication faults after the board leaves the bench.
Battery And Charger Systems
Battery packs, chargers and vehicle subsystems may use CAN lines near switching power stages. A CAN Bus / RS485 TVS diode gives the transceiver a local clamp path when cable routing and grounding are reviewed before testing. It also helps avoid communication faults after the board leaves the bench. That keeps the bus protection tied to the real field wiring.
FAQ
How do I choose a CAN Bus / RS485 TVS diode?
Start with bus type, normal voltage range, common-mode condition, capacitance limit, package, grounding path and surge exposure. The TVS should protect the transceiver without disturbing normal differential communication. It also helps avoid communication faults after the board leaves the bench.
Should CAN and RS485 use bidirectional TVS parts?
Often yes, because differential lines can see transients in both directions. CA-style bidirectional TVS parts are common, but the final choice should match bus voltage, signal swing and package needs. That keeps the bus protection tied to the real field wiring.
Where should the bus TVS be placed?
Place it near the connector or cable entrance with a short path to the return point. Keep pair routing balanced so the protection device does not create extra mismatch or noise pickup. It also helps avoid communication faults after the board leaves the bench.
Can SMBJ24CA protect every RS485 line?
No. Some networks need a different standoff voltage or lower capacitance. Check normal bus voltage, cable environment and transceiver limits before choosing SMBJ24CA or SMBJ36CA. That keeps the bus protection tied to the real field wiring. It also helps avoid communication faults after the board leaves the bench.
What data helps quote bus TVS parts?
Send the bus type, normal voltage, cable length, surge exposure, package target, old marking and quantity. A board or connector photo helps us confirm the placement and package route. It also helps avoid communication faults after the board leaves the bench.
Can small PESD arrays replace SMBJ packages?
Only when pulse energy and voltage fit the application. PESD arrays save space and can suit connector-side ESD, while SMBJ packages may provide stronger surge handling for harsher field wiring. That keeps the bus protection tied to the real field wiring.
Can Lian Tuo support CAN or RS485 equivalents?
Yes. We can compare SMBJ24CA, SMBJ36CA, PESD arrays and CAN Bus / RS485 TVS diode equivalents by voltage, capacitance, package and field environment. It also helps avoid communication faults after the board leaves the bench. That keeps the bus protection tied to the real field wiring.
Internal Product Links
Bidirectional TVS Diode Medium Voltage TVS Diode Industrial Surge Protection TVS
