L9678P-S - Airbag System Chip | STMicroelectronics
Référence : L9678P-S ✓ ActifL9678P-S Présentation
An automotive airbag system basis chip is a specialized mixed-signal power-management and communication IC that combines supply generation, sensor interfacing, control logic, and safety-related monitoring. It belongs to the hierarchy of integrated circuits, interface ICs, automotive semiconductors, and power-management devices. The L9678P-S targets entry-level airbag and cut-off-battery designs where a configurable supply can balance cost and performance.
Key features include a complete internal power-management system, two PSI-5 remote-sensor interface channels, a dedicated regulator for the remote sensor, and user-configurable supply behavior. The device is also identified as pin compatible with the L9678P, providing a defined migration path within STMicroelectronics' airbag system-chip family. Its 64-LQFP package provides 64 electrical contacts in a 10 x 10 mm surface-mount outline.
Technically, the L9678P integrates several functions required around an automotive restraint system rather than operating as a simple sensor or standalone power switch. Its internal supply architecture can support external airbag-related circuitry, while the remote-sensor regulator supplies the PSI-5 sensor network. The two-channel PSI-5 interface allows remote sensors to share communication resources more efficiently than an equivalent discrete implementation.
Typical uses include entry-level automotive airbag controllers, battery cut-off systems, remote-seat and remote-impact sensor networks, and vehicle safety subsystems requiring coordinated power and sensor communications. The L9678P-S is particularly relevant to emerging-market vehicle platforms where cost-conscious configuration is useful but functional integration remains important.
Designers should verify the exact regulator outputs, voltage limits, current ratings, diagnostic coverage, timing, and external-component requirements in DS11626_REV10_JUN14 before layout release. Because this device controls safety-related automotive functions, validation should include worst-case supply conditions, sensor faults, short-circuit behavior, thermal stress, and compatibility with the vehicle-level diagnostic strategy.
This page consolidates verified manufacturer and distributor information, the confirmed L9678P pin-compatible alternative, application guidance, package constraints, and explicit data gaps, providing engineering context beyond a distributor listing while avoiding unsupported electrical assumptions.
Alternatives de remplacement direct pour L9678P-S — 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 L9678P-S (même facteur de forme et même empreinte) — différant par Mounting Type, Package, Product Type.
L9678P
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Voir la fiche technique →L9678P-S Spécifications
| Product Type | Automotive user-configurable airbag and battery cut-off system chip |
| Device Function | Integrated power-management and remote-sensor interface for entry-level automotive airbag systems |
| PSI-5 Remote Sensor Interface Channels | 2 channels |
| Remote Sensor Regulator | 1 dedicated regulator |
| Power Management Architecture | Complete internal power-management system with user-configurable supply |
| Boîtier | 64-LQFP, 10 x 10 mm |
| Nombre de broches | 64 pins |
| Type de montage | Surface-mount LQFP |
| Target Market | Emerging-market automotive applications |
| Primary Application | Entry-level automotive airbag systems |
| Secondary Application | Automotive battery cut-off systems |
| Pin Compatibility | Pin compatible with L9678P |
Guide de configuration des broches du L9678P-S 64-lqfp, 10 x 10 mm
Configuration des broches du L9678P-S (boîtier 64-lqfp, 10 x 10 mm). 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 L9678P-S.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
L9678P-S convient pour 6 applications: Entry-Level Automotive Airbag Controller, Battery Cut-Off System, PSI-5 Remote Sensor Network, Remote Impact Sensor Interface, Remote Seat Sensor Interface, Emerging-Market Vehicle Safety Platform.
Entry-Level Automotive Airbag Controller
The L9678P-S fits an entry-level automotive airbag controller because it combines a complete internal power-management system with two PSI-5 remote-sensor interface channels in one 64-LQFP 10 x 10 mm device. This integration reduces the number of discrete interface elements around the restraint-control electronics while retaining configurable supply behavior for cost and performance optimization. The L9678P-S is pin compatible with the L9678P, giving designers a documented family migration path when the two-channel PSI-5 interface and dedicated remote-sensor regulator are not required. Final suitability still depends on validating DS11626_REV10_JUN14 against the vehicle's voltage range, load currents, fault-response requirements, and safety architecture.
Recommandé
Battery Cut-Off System
The L9678P-S is suitable for a vehicle battery cut-off system where centralized power management and sensor-network support are needed in one automotive IC. Its user-configurable supply architecture allows an engineer to select a configuration that balances cost against performance for the particular cut-off function, while the two PSI-5 channels can support compatible remote sensors. The 64-LQFP 10 x 10 mm package provides a substantial pin count for power, communication, monitoring, and control connections. Because the verified snippets do not disclose exact output ratings or fault thresholds, a production design must confirm those values, external passives, short-circuit behavior, and diagnostic coverage in the manufacturer datasheet.
Recommandé
PSI-5 Remote Sensor Network
The L9678P-S is specifically relevant to a PSI-5 remote sensor network because it provides two PSI-5 remote-sensor interface channels and a dedicated regulator for the remote sensor. This allows compatible sensors to communicate with the automotive safety controller while receiving the required sensor supply from a purpose-built regulator rather than a generic system rail. Using a 64-LQFP 10 x 10 mm device also provides dedicated package space for power, interface, monitoring, and control connections. Engineers should verify cable-length limits, timing, bus loading, sensor wake-up behavior, and fault diagnostics in DS11626_REV10_JUN14 before integrating remote crash or seat-sensor networks.
Recommandé
Remote Impact Sensor Interface
A remote impact-sensor interface can use the L9678P-S to combine sensor communication and supply generation in one automotive system chip. Its two PSI-5 remote-sensor interface channels support a dual-sensor arrangement, while the dedicated remote-sensor regulator supplies the sensor network from the same device. This is useful in restraint systems where remote sensor placement requires wiring across the vehicle and where minimizing the number of discrete interface components can simplify layout. The L9678P-S is reported as pin compatible with the L9678P, but the added functions must remain enabled and valid in the selected variant. Exact timing, supply limits, and diagnostic behavior must be validated from the manufacturer datasheet.
Recommandé
Remote Seat Sensor Interface
The L9678P-S can support an automotive remote seat-sensor interface through its two PSI-5 remote-sensor channels and dedicated remote-sensor regulator. The integrated approach is appropriate when the restraint controller must communicate with remote seat-position or occupant-sensing nodes and provide a regulated sensor supply. Its user-configurable power-management architecture supports cost-focused entry-level vehicle programs, while the 64-LQFP package offers enough pins for a complete safety-control interface. Verification should include sensor compatibility, bus timing, supply sequencing, line faults, temperature effects, and system diagnostic coverage; those detailed electrical limits are not reproduced from the supplied search snippets.
Recommandé
Emerging-Market Vehicle Safety Platform
The L9678P-S targets emerging-market automotive applications where a configurable airbag system chip can balance functional integration with production cost. It combines power management, two PSI-5 remote-sensor channels, and a dedicated sensor regulator in a 64-LQFP 10 x 10 mm package, while STMicroelectronics confirms pin compatibility with the L9678P for broader sourcing flexibility. This makes the family suitable for entry-level restraint systems that need centralized control and remote-sensor communication without the component count of a fully discrete implementation. The final platform decision should account for exact electrical ratings, qualification grade, diagnostic strategy, thermal performance, lifecycle commitments, and the manufacturer's complete DS11626_REV10_JUN14 requirements.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour L9678P-S — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | L9678P |
|---|---|---|
| Package | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) |
| Brand | STMicroelectronics | STMicroelectronics |
| Product Type | Automotive user-configurable airbag and battery cut-off system chip | Automotive airbag system basis chip |
| Pin Compatibility | Pin compatible with L9678P | Base device in the manufacturer-confirmed pin-compatible pair |
| Primary Applications | Entry-level airbag and battery cut-off systems | Automotive airbag system basis chip applications |
Principaux différenciateurs
- Integrated two-channel PSI-5 remote-sensor interface (vs L9678P)
- Dedicated remote-sensor supply (vs L9678P)
- Manufacturer-confirmed family migration path (vs L9678P)
Notes de conception
Treat the internal power-management system as a configurable safety-critical subsystem rather than a generic supply. Before schematic release, map every L9678P-S regulator output to its required load and verify startup, current limit, short-circuit response, and supply sequencing in DS11626_REV10_JUN14. The supplied sources establish that the supply is user configurable but do not provide the selectable voltage or current values, so those values must not be assumed during external component selection.
Reserve the 64-LQFP 10 x 10 mm footprint with all 64 connections and follow the manufacturer land pattern exactly. Keep power and sensor-interface return paths compact, place required input, output, and bypass capacitors according to the datasheet, and isolate the two PSI-5 routes from sensitive control signals where practical. Because individual pin assignments were not supplied in the verified snippets, verify the complete 64-pin map and unused-pin treatment against the official PDF before fabrication.
Do not treat generic high-side-switch listings as equivalent L9678P-S replacements. The verified cross-reference search mentioned the Infineon BTS7002-1T, BTS7005-1T, and Allegro A2980SLB-1, but it did not establish the same 64-LQFP footprint, pin-to-pin compatibility, regulator integration, or two-channel PSI-5 functionality. The only confirmed drop-in family relation is the manufacturer-stated compatibility between L9678P-S and L9678P.
Calculate power loss from the actual regulator configurations and load currents rather than assuming a common dissipation value. Use the maximum-load operating mode, ambient temperature, board construction, and package thermal data from DS11626_REV10_JUN14 to evaluate junction temperature. The verified snippets provide neither regulator ratings nor thermal resistance, so a numerical thermal estimate would be unsupported until those parameters are obtained from the manufacturer document.
Informations de conformité
The supplied verified snippets identify an automotive application but do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals compliance. These fields remain unknown rather than being inferred from the automotive application.
