L9637D013TR ISO 9141 Bus Driver | STMicroelectronics
Référence : L9637D013TR ✓ ActifL9637D013TR Présentation
An ISO 9141 bus driver is a physical-layer interface IC that connects a low-voltage controller to a wired vehicle bus through a logic-level K line. This interface sits between an embedded controller or diagnostic tool and the vehicle wiring, combining bus-line drive, receive, protection, and standby behavior in one device. It belongs to the broader interface-IC and automotive-transceiver hierarchy.
The L9637D013TR provides a typical supply current of 2.3 mA, a defined output-off state during undervoltage or supply interruption, and high input impedance when the supply or ground is unavailable. Its output current limiting is characterized by a typical value of 60 mA. Reverse-supply protection extends to -24 V, while transient operation reaches 40 V, making the interface appropriate for electrically demanding vehicle diagnostic networks.
The device is used in ISO 9141 K-line diagnostic systems, automotive diagnostic testers, ECU test equipment, vehicle interface adapters, service-bus analyzers, and embedded diagnostic controllers. Its logic input and logic output arrangement allows a microcontroller UART to control and monitor communication with a vehicle ECU over the K line.
When designing the circuit, protect the K-line connection against sustained faults and electrostatic discharge, place the bus-side interface components close to the connector, and verify that the external protection network does not distort the intended bus waveform. The 8-pin SOIC footprint is straightforward to route, but the connector-side transient path and ground return deserve particular attention in automotive harnesses.
This page consolidates the device function, electrical limits, package details, drop-in alternatives, application guidance, and design considerations engineers need when selecting or integrating an ISO 9141 interface. It also distinguishes the target order code from related L9637 variants so engineers can verify packaging and temperature identifiers before placing a replacement on an existing PCB.
Alternatives de remplacement direct pour L9637D013TR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec L9637D013TR (même facteur de forme et même empreinte) — différant par Input Type, Output Type, Package, Packaging.
E-L9637D013TR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →MC33660
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
L9637D013TR Spécifications
| Device Type | ISO 9141 bus driver and transceiver interface |
| Interface Standard | ISO 9141 |
| Supply Voltage Range | 4.5 V to 36 V |
| Transient Supply Voltage | 40 V |
| Reverse Supply Protection | Down to -24 V |
| Courant d'alimentation | 2.3 mA typical |
| Input Type | Logic |
| Type de sortie | Logic |
| Output Current Limitation | 60 mA typical |
| Undervoltage Output State | Defined OFF output status |
| Supply or Ground Interruption | Defined OFF output status |
| High-Impedance Condition | High input impedance for open VS or GND |
| Boîtier | 8-SOIC, 0.154 inch (3.90 mm) width |
| Packaging | Cut Tape (CT) |
| Type de montage | Surface mount |
Guide de configuration des broches du L9637D013TR 8-soic, 0.154 inch (3.90 mm) width
Configuration des broches du L9637D013TR (boîtier 8-soic, 0.154 inch (3.90 mm) width). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour L9637D013TR.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
L9637D013TR convient pour 6 applications: Automotive ECU Diagnostic Interface, Vehicle Diagnostic Test Adapter, ECU Flash and Service Interface, Automotive Communication Line Analyzer, K-Line Powered Service Module, Industrial ISO 9141 Test Fixture.
Automotive ECU Diagnostic Interface
The L9637D013TR fits an ISO 9141 K-line diagnostic interface between a vehicle ECU and a low-voltage diagnostic controller. Its 4.5 V to 36 V normal operating range supports vehicle electrical environments, while the 40 V transient rating and reverse-supply protection down to -24 V add margin against battery-related faults. The typical 2.3 mA supply current is suitable for continuously powered diagnostic modules, and the defined OFF output under undervoltage prevents unintended bus activity during reset conditions. Use the logic-side pins to connect the controller UART and the K-line side to the protected vehicle harness connection.
Recommandé
Vehicle Diagnostic Test Adapter
The L9637D013TR can form the K-line physical layer in a compact handheld or installed vehicle diagnostic adapter. Its logic input and logic output arrangement permits a controller to command the bus and receive vehicle responses, while output-current limiting helps contain errors when the K line is shorted or miswired. The 8-SOIC package simplifies routing in an adapter built around an embedded controller. Reverse-supply and transient ratings provide useful protection, but the adapter should still include an appropriately rated connector-side protection network and a controlled ground return.
Recommandé
ECU Flash and Service Interface
For ECU flash-download or service equipment, the L9637D013TR provides the ISO 9141 physical interface required to communicate with compatible vehicle modules. The normal 36 V supply ceiling accommodates automotive battery environments, and the transient tolerance to 40 V supports robustness during harness disturbances. The device's typical 2.3 mA supply current helps maintain low overhead in portable service equipment. Because diagnostic sessions can involve repeated bus activity, validate timing, standby behavior, and the complete diagnostic connector circuit against the target ECU rather than relying on generic ISO 9141 assumptions.
Recommandé
Automotive Communication Line Analyzer
The L9637D013TR is suitable for communication analyzers that need to monitor or stimulate an ISO 9141 K line while sharing electronics with a controller. High input impedance during an open supply or ground condition improves behavior in bench setups where power connections may be incomplete, and the defined OFF output state provides predictable signaling during undervoltage. Its surface-mount 8-SOIC format allows the interface to be placed near the diagnostic connector, reducing the unprotected harness segment. Connector-side transient suppression and grounding remain essential because the IC's internal ratings do not replace an external vehicle-network protection strategy.
Recommandé
K-Line Powered Service Module
The L9637D013TR can support service modules that combine logic-level controller electronics with an ISO 9141 vehicle connection. Its 2.3 mA typical supply current is useful where the diagnostic interface must remain available without imposing a large continuous load on the module's regulated supply. The device also maintains a defined output state during supply interruption and undervoltage, helping the system avoid false commands on the bus. Designers should budget the logic-side and K-line external networks around the manufacturer's recommended values and confirm that standby-current requirements fit the power budget.
Recommandé
Industrial ISO 9141 Test Fixture
The L9637D013TR can be incorporated into industrial test fixtures or service equipment that emulates an ISO 9141 diagnostic connection. Its logic interface is straightforward for a controller, while supply interruption, reverse-battery, and transient protections improve robustness in reusable bench equipment. The SOIC-8 package is easy to route on a small interface daughterboard and can be positioned near a protected connector. For a reusable fixture, include accessible test points, verify the K-line current limit during a short-circuit test, and establish a low-impedance ground path to prevent coupling between the vehicle bus and sensitive controller circuitry.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour L9637D013TR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | E-L9637D013TR | MC33660 |
|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | NXP Semiconductors |
| Package | 8-SOIC | 8-SOIC - same package | SOIC-8 - same package |
| Interface | ISO 9141 | ISO 9141 | ISO 9141 K-line |
| Device Type | Bus driver and transceiver interface | Bus driver and transceiver interface | K-line transceiver |
| Normal Supply Range | 4.5 V to 36 V | 4.5 V to 36 V | Similar 36 V supply |
Principaux différenciateurs
- Identical ISO 9141 function in the same SOIC-8 footprint (vs E-L9637D013TR)
- Documented automotive fault handling (vs MC33660)
- Target order code retains specified cut-tape configuration (vs E-L9637D013TR)
Notes de conception
Treat the 40 V transient capability and -24 V reverse-supply protection as component fault-protection limits, not as permission to remove external protection. The K line is connected to a vehicle harness and can experience transients beyond the normal operating range. Use an appropriately rated connector-side protection network and verify that its capacitance and leakage do not distort ISO 9141 signaling or increase standby current.
Place the L9637D013TR close to the diagnostic connector and route the K-line path to the connector without long unprotected stubs. Keep the logic-side UART traces away from the K-line trace and the protected vehicle-harness side of the circuit. Provide a direct ground-return path to the interface circuit; a high-impedance ground can allow bus current to induce false logic levels or couple noise into the controller.
Check the supply network for operation across 4.5 V to 36 V and for the transient conditions required by the target vehicle. The device has reverse-supply protection down to -24 V and a typical supply current of 2.3 mA, but those figures do not determine the safe operating area of an external regulator or connector protection component. Validate startup, undervoltage behavior, standby current, and output-off behavior in the complete module.
Do not infer pin functions solely from the ISO 9141 application or the SOIC-8 outline. Confirm every numbered terminal against the manufacturer pin-description table, especially supply, ground, logic-input, logic-output, and K-line connections. For a replacement device, compare logic polarity, receiver behavior, output-current limiting, undervoltage state, and package orientation rather than relying on the shared SOIC-8 footprint alone.
Informations de conformité
The available product information identifies the L9637 as an automotive interface but does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
