ISO9141 Interface

The L9637 is a monolithic integrated circuit containing standard ISO 9141 compatible interface functions.

Key Features

  • Defined OFF output status in undervoltage condition and VS or GND interruption
  • K output current limitation, typ. IK = 60 mA
  • High input impedance for open VS or GND connection
  • Controlled output slope for low EMI
  • Defined K output OFF for TX input open
  • Defined output ON status of LO or RX for open LI or K inputs
  • EMI robustness optimized
  • Integrated pull up resistors for TX, RX and LO
  • Overtemperature shut down function Selective to K-I/O pin
  • Bidirectional K-I/O pin with supply voltage dependent input threshold
  • Operating power supply voltage range 4.5 V ≤ VS ≤ 36 V (40 V for transients)
  • Standby mode with very low current consumption ISSB ≤ 1 mA @ VCC ≤ 0.5 V
  • Reverse supply (battery) protected down to VS ≥ -24 V
  • TTL compatible TX input
  • Wide input and output voltage range -24 V ≤ VK ≤ VS
  • Low quiescent current in off condition ISOFF = 120 µA

Circuit Diagram

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Technical Documentation

Product Specifications
Description Version Size
DS0212 DS0212: Monolithic bus driver with ISO 9141 interface 8.0 201 KB
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Part Number Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
E-L9637D SO-8 Tube -40 150 Active - - NEC EAR99 MALAYSIA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY
E-L9637D013TR SO-8 Tape And Reel -40 150 Active - - NEC EAR99 MALAYSIA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY

(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
E-L9637D ActiveSO-8AutomotiveEcopack2 (**) 0 0
E-L9637D013TR ActiveSO-8AutomotiveEcopack2 (**) 0 0

(**) The Material Declaration forms available on 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.