# L9637D (Component)

## Description

ISO 9141 Bus Driver – Monolithic interface IC providing bidirectional serial communication between a microcontroller and an automotive diagnostic bus\. The STMicroelectronics L9637D supports ISO 9141 communication through a bidirectional K\-line interface and a separate L\-line comparator\. It operates from 4\.5 V to 36 V, with 40 V transient capability, supports communication frequencies up to 50 kHz, and provides TTL\-compatible TX input and RX/LO outputs\. The device includes reverse\-battery protection, thermal shutdown, current limiting, and controlled output slew rate\. It is housed in an SO\-8 package\.

\#STMicroelectronics \#L9637D \#ISO9141 \#KLine \#AutomotiveDiagnostics \#BusDriver \#Transceiver \#AutomotiveElectronics \#SO8

## Component Details

- **Owner:** silicon\-yard
- **Created:** 9/4/2026
- **Last Updated:** 9/4/2026
- **Visibility:** Public
- **Part Type:** Inductors
- **Symbol Style:** parametric\-v1
- **Datasheet URL:** https://www\.st\.com/resource/en/datasheet/l9637\.pdf
- **Manufacturer Part Number:** L9637D
- **Manufacturer Name:** STMicroelectronics
- **Used in:** 1 project

## Distributor Pricing (qty 1)

*Pricing shown for quantity 1. For price breaks and other quantities, open in Flux.*

| Distributor | Unit Price (qty 1) | Stock |
|------------|--------------------|-------|
| [Digi\-Key](https://www.digikey.com/en/products/detail/stmicroelectronics/L9637D/1663478) | N/A | N/A |
| [Mouser](https://www.mouser.com/en/ProductDetail/STMicroelectronics/L9637D?qs=lmFdVnkOgNnwIHpcL%252FXw9g%253D%253D) | N/A | N/A |

- **Part Type:** Inductors
- **Sub-Type:** Other
- **Manufacturer:** STMicroelectronics
- **MPN:** L9637D
- **Mount Type:** Reverse
- **Package / Case Code:** 8\-SO
- **Pin Count:** 8
## Pins

| Pin | Name | Type |
|-----|------|------|
| 1 | RX | Unspecified |
| 2 | LO | Unspecified |
| 3 | VCC | Unspecified |
| 4 | TX | Unspecified |
| 5 | GND | Unspecified |
| 6 | K | Unspecified |
| 7 | VS | Unspecified |
| 8 | LI | Unspecified |

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*Generated from [https://flux\.ai/silicon\-yard/l9637d\~r9](https://flux.ai/silicon-yard/l9637d~r9)*