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Advance Telematics Unit/ Vehicle Tracking System/ V2X communication.

In the rapidly evolving automotive industry, the Telematics Control Unit (TCU) has emerged as a critical component that enables seamless communication and data exchange between vehicles and the outside world. The TCU is equipped with various wired interfaces such as the Controller Area Network (CAN), Ethernet, LIN, and Flexray as well as wireless interfaces like Bluetooth, Wi-Fi, and a cellular modem. The ESD protection of these interfaces is crucial & must be considered thoughtfully.

Automotive Applications


Reverse Polarity Protection Audio Speaker PMIC Memory SIM Socket Sensors CAN Transceiver OBD II Connector Ethernet Switch UART CAN/LIN SPI/12C ECU GSM and GPS USB Port MCU Connector

Design Consideration:

  • As USB Type C connector incorporates different pins such as D+/D, Vbus, data lines RX and TX,CC & SBU, appropriate ESD protection devices should be designed in, keeping in mind the specifications for each of these lines.
  • Due to the small size of the USB connector, a key consideration in selecting ESD devices is minimizing package size.
  • For high-speed data lines (Tx, Rx) & D+/D-lines, bidirectionoal ESD devices with ultra small junction capacitance must be considered.
  • The Vbus line has more than 20V working voltage. Here an ESD device with fast response time & low clamping voltage would be a good fit.
  • As the CC and SBU lines are near the Vbus line, they could experience voltages up to 20V in short circuit condition. Therefore, ESD diodes with working voltages between 5V-24V must be considered here.

Technical Documents

Recommended Parts

Part Number Part Number Description
RClamp3331PQ RailClamp® Low Capacitance ESD and EOS Protection
RClamp0582BQ Low Capacitance TVS for Automotive Applications
RClamp0512TQ Low Capacitance RailClamp® 2-Line Surge and ESD Protection
RClamp0531TQ Ultra-Low Capacitance 1-Line ESD protection
RClamp3552TQ AEC-Q100 Qualified, 2-Line, Low-Capacitance ESD Protection Array

Design Consideration:

  • PHY side: Device should operate at a low capacitance(less than 3pf) avoiding any unwanted circuit disturbances. And It should provide at least level-4 ESD immunity.
  • Connector Side: Device should protect 2 lines, Bidirectional configuration, operate on working voltage > 24V and trigger voltage must be > 100V.
  • Both the devices must be AECQ grade.

Technical Documents

Recommended Parts

Part Number Part Number Description
RClamp0592PWQ Low Capacitance RailClamp® 2-Line Surge and ESD Protection
RClamp01892PWQ Low Capacitance RailClamp® 2-Line Surge and ESD Protection
RClamp0512TQ Low Capacitance RailClamp® 2-Line Surge and ESD Protection
RClamp1631PQ Low-Capacitance RailClamp® 1-Line, 16V ESD and EOS Protection
RClamp2831PQ Low capacitance RailClamp TVS for protection of high-speed automotive interfaces
RClamp10012PQ 2-Line ESD Protection for Automotive Ethernet
RClamp10022PWQ 2-Line ESD Protection for Automotive Ethernet
EClamp10012PQ EMIClamp 2-Line Interface Circuit for Automotive Ethernet

Design Consideration:

  • Device should have high ESD robustness up to 30 kV and high surge currents.
  • Device should have Excellent ESD clamping behavior.
  • Device should operate at a low capacitance avoiding any unwanted circuit disturbances.
  • Device should be AECQ Qualified.

Technical Documents

Recommended Parts

Part Number Part Number Description
uClamp2482PWQ 24V ESD and EOS Protection for 2-Line Automotive Applications
uClamp2424PWQ 24V ESD and EOS Protection for 4-Line Automotive Applications
RClamp1631PQ Low-Capacitance RailClamp® 1-Line, 16V ESD and EOS Protection
RClamp2831PQ Low capacitance RailClamp TVS for protection of high-speed automotive interfaces

Design Consideration:

  • Since the maximum frequency does not exceed 30 kHz, the capacitance of the ESD diode is not a concern.
  • Device working voltage should not typically exceed 5V.
  • ESD Device should be bidirectional, as analog audio can have both positive and negative voltage swings.
  • Device should be AECQ Qualified.

Technical Documents

Recommended Parts

Part Number Part Number Description
uClamp3311PQ Low Voltage μClamp® for Automotive Applications
uClamp0511PQ μClamp® 1-Line ESD protection
uClamp0301PQ Low Voltage μClamp® for ESD and CDE Protection
uClamp0571P High-Power μClamp® 5V ESD and Surge Protection

Design Consideration:

  • The capacitance of the device should be minimized in order to avoid harmonic distortion of the RF signal.
  • The device should be bidirectional to provide protection against both positive and negative ESD strikes.
  • The device should have low Clamping voltage and low dynamic resistance.

Technical Documents

Recommended Parts

Part Number Part Number Description
RClamp3331PQ RailClamp® Low Capacitance ESD and EOS Protection
RClamp0551PQ Ultra-Low Capacitance 1 Line, 5V ESD Protection
RClamp0561PQ Femto Farad RailClamp® 1-Line, 140fF ESD Protection
RClamp1561PQ Femto Farad RailClamp® ESD Protection for RF Interfaces
RClamp2431TQ Ultra-Low Capacitance 1-Line ESD protection
RClamp1631PQ Low-Capacitance RailClamp® 1-Line, 16V ESD and EOS Protection
RClamp2831PQ Low capacitance RailClamp TVS for protection of high-speed automotive interfaces

Design Consideration:

  • Device should protect 3 Signal Lines(Reset, Clock and Data) and one Vcc line.
  • Device should have Low Operating voltage. (less than 5.5V)
  • The Device should support frequency up to 5MHz.
  • Ideal ESD device may have EMI filter incorporated within it.

Technical Documents

Recommended Parts

Part Number Part Number Description
EClamp2455K ESD-EMI 4-line Protection for SIM Card
EClamp2485T ESD/EMI Protection for SIM Card
EClamp2465T Low Capacitance ESD/EMI Protection for SIM Card
SRV05-4 RailClamp® Low-Capacitance TVS Diode Array
RClamp0504S RailClamp® Low-Capacitance TVS Array

Design Consideration:

  • Device should have high ESD robustness up to 30 kV and high surge currents.
  • Device should have Excellent ESD clamping behavior.
  • Device should have High Operating voltage. Device should be AECQ Qualified.

Technical Documents

Recommended Parts

Part Number Part Number Description
uClamp0301PQ Low Voltage μClamp® for ESD and CDE Protection
uClamp0511PQ μClamp® 1-Line ESD protection
uClamp0571P High-Power μClamp® 5V ESD and Surge Protection
uClamp3601P TVS Diode for Proximity Switch Input Protection
uClamp3603T TVS Diode Array for Proximity Switch Protection
uClamp3671P High-Power μClamp® 36V ESD & Surge Protection

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