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SI9243AEY-T1-E3

ISO 9141 bus transceiver, 6-36V VBAT, 200kBaud, reverse protection, SOIC-8

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Manufacturer Part：

SI9243AEY-T1-E3

Package：

SOIC-8 (5 x 4 mm)

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Description

Product Overview

The SI9243AEY-T1-E3 from Vishay Siliconix is an ISO 9141-compatible single-ended bus transceiver for automotive diagnostic communication. Operating from 6V to 36V battery supply with reverse battery protection and 200kBaud data rate, it provides robust bidirectional serial communication in SOIC-8 package.

Key Specifications

Supply Voltage (VBAT) 6V to 36V
Data Rate 200 kBaud (typical)
Reverse Battery Protection Down to -24V
Standby Current (IBAT) 1 μA @ VDD=0.5V
Quiescent Current (OFF) 120 μA (IBAT)
ESD Rating 2 kV
Protocol ISO 9141
Package SOIC-8
Operating Temperature -40°C to +125°C

Features

  • ISO 9141 compliant for automotive diagnostic bus communication
  • Wide 6V to 36V battery supply operation with reverse protection to -24V
  • Overtemperature shutdown function for K output protection
  • Short circuit protection to VBAT on K and L pins

Applications

  • Automotive OBD diagnostic interfaces
  • Vehicle ECU communication modules
  • ISO 9141/K-Line protocol adapters
  • Automotive service tool interfaces
  • Industrial single-wire bus communication

The SI9243AEY-T1-E3 from Vishay Siliconix is a monolithic single-ended bus transceiver designed for bidirectional serial communication in automotive diagnostic applications compliant with the ISO 9141 standard. Operating from a 6V to 36V battery supply, it provides the physical layer interface between a microcontroller UART and the single-wire K/L diagnostic bus. The device features comprehensive protection including reverse battery protection down to -24V, overtemperature shutdown, short-circuit protection to VBAT, and defined output states for fault conditions. With typical transmit speeds of 200kBaud and ultra-low 1μA standby current, it is well-suited for automotive ECU diagnostic ports and service tool interfaces.

The SI9243AEY operates as a bidirectional single-ended bus transceiver. (1) In transmit mode (TX low), the internal MOSFET pulls the K line low, with the TX signal inverted and driven onto the bus. The processor monitors RXK and TX to verify correct bus operation, detecting faults when they do not mirror each other. (2) In receive mode, the K and L pin voltages are internally compared to VBAT/2. If the bus voltage is below VBAT/2, RXK/RXL output low; if above, they output high. (3) Protection circuits include overtemperature shutdown that disables the K output when the die temperature exceeds the threshold, and short-circuit detection that disables the K output and sets the fault flag when VBAT short is detected. (4) The fault output (open-drain) provides an interrupt to the microcontroller when overtemperature or short-circuit conditions occur.

Pin Name Function
1 TX Transmit data input (active low)
2 RXL Receive L line data output
3 RXK Receive K line data output
4 VBAT Battery supply (6-36V)
5 L L line bus connection
6 K K line bus connection
7 GND Ground
8 VDD Logic supply (5V)
  • Automotive OBD-II diagnostic connector K-line interface
  • Vehicle ECU diagnostic communication ports per ISO 9141
  • Automotive service tool K/L-line adapters
  • ISO 9141 protocol converters and gateway modules
  • Industrial single-wire bus communication with high-voltage protection
Model Manufacturer Key Difference
SI9243AEY Vishay Standard (non-lead-free) version
L9637D STMicroelectronics ISO 9141 transceiver, SOIC-8
MC33290 NXP ISO K-line transceiver, SOIC-8
TJA1021T NXP LIN transceiver (different protocol)
SN65HVDA100 TI ISO 9141 transceiver
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

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Contact Us

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Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

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We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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