L9679B - Automotive Battery Cut-Off and Airbag IC | STMicroelectronics
料号： L9679B ✓ 量产中L9679B 概述
An automotive battery cut-off and airbag expansion IC is a specialized interface device within the broader hierarchy of automotive interface IC, system-specific peripheral, power-management IC, and semiconductor. These devices connect battery and restraint-system circuits to a larger microcontroller or vehicle network while providing the electrical functions needed for controlled switching, monitoring, diagnostics, and expansion of airbag-system connections. Their design emphasis is integration within demanding vehicle electronics rather than general-purpose signal processing.
The verified listing identifies the L9679B as an interface device from STMicroelectronics and categorizes it under power-management specialized PMIC and SPS ASSP products. It is supplied in a 100-lead LQFP package, giving the design a substantial pin count for multiple automotive circuit interfaces. The available source data does not provide verified operating-voltage, output-current, logic-threshold, diagnostic, or switching-time figures, so those technical values must be confirmed directly against the manufacturer datasheet before design release.
Automotive battery management is a natural use for this device because the L9679B is specifically described as an automotive battery cut-off circuit. Its integration can reduce the number of discrete connections and interface functions otherwise required around the battery-monitoring and load-control sections of a vehicle ECU. Engineers should still evaluate the supported battery chemistry, operating range, quiescent load, and protection behavior against their exact vehicle platform before assigning the IC.
The airbag-system expansion function is also explicitly identified in the available L9679E family description. In a restraint-system controller or expansion interface, the L9679B can support additional squib-driver or deployment-loop connections while remaining under the control of the vehicle's safety controller. Because deployment behavior is safety-critical, the complete manufacturer application information, fault-response requirements, and diagnostic strategy must govern the implementation.
The main design consideration is verification depth. Although the LQFP-100 package and automotive interface role are established by the supplied listings, detailed pin assignment, thermal limits, electrical characteristics, and component revisions are not included in the retrieved data. Do not infer them from a similarly named L9679-family device without confirming the exact suffix and revision against the STMicroelectronics datasheet and qualification documentation.
This product record combines verified distributor pricing, package identification, source links, and application-oriented engineering guidance. It also distinguishes documented facts from unavailable parameters, reducing the risk of treating generic family descriptions as guaranteed L9679B electrical limits.
直接替换替代料： L9679B ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
L9679E
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9679B 规格参数
| Product Type | Automotive battery cut-off and airbag system expansion interface IC |
| Manufacturer | STMicroelectronics |
| Device Classification | Specialized interface IC |
| PMIC Category | Power Management Specialized |
| Product Class | SPS ASSP |
| 封装 | LQFP 100 (14x14x1.4 mm) |
| 引脚数量 | 100 pins |
| 安装类型 | Surface mount |
| Application Domain | Automotive electronics |
| Battery Cut-Off Function | Supported |
| Airbag System Expansion Function | Supported |
| Maximum Rated Temperature | 105 °C |
L9679B lqfp 100 (14x14x1.4 mm) 引脚配置指南
L9679B（lqfp 100 (14x14x1.4 mm) 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： L9679B.
请参阅 数据手册 以查看完整引脚配置。
典型应用
L9679B 适用于 6 应用s: Automotive Battery-Control ECU, Airbag-System Expansion Interface, Vehicle Load-Control Module, Battery Monitoring and Diagnostic ECU, Restraint Controller Expansion Module, Automotive Power-Management Subsystem.
Automotive Battery-Control ECU
The STMicroelectronics L9679B is suitable for a battery-control ECU because the verified family description identifies it specifically as an automotive battery cut-off circuit. Its LQFP-100 package provides 100 external connections for integrating the device with surrounding power-control and monitoring circuitry. Using a dedicated interface IC can reduce discrete routing and centralize battery-related connections within the ECU. The documented maximum rated temperature is 105 °C. Before implementation, engineers must confirm the supported battery voltage, cut-off behavior, quiescent load, protection thresholds, and exact pin assignments from the L9679B datasheet.
推荐
Airbag-System Expansion Interface
The L9679B is directly aligned with airbag-system expansion because the available L9679 family description identifies this function alongside battery cut-off control. In a restraint controller or expansion module, the 100-pin LQFP package can provide the interface density needed for additional deployment-loop connections and surrounding control circuitry. This integration can simplify harness routing compared with a collection of discrete interface networks. Because deployment control is safety-critical, use only the exact manufacturer B-revision pinout and fault-response requirements, and verify AEC-Q100 qualification before production release.
推荐
Vehicle Load-Control Module
The battery cut-off function documented for the L9679B makes it a candidate for a vehicle load-control module that coordinates battery isolation and power-delivery functions. The LQFP-100 (14x14x1.4 mm) package supports integration on a dense automotive controller board, while the stated 105 °C maximum rated temperature provides a defined environmental reference for that platform. The supplied sources do not identify the maximum switched load, operating-voltage limits, or short-circuit response, so those ratings must be established before the IC is assigned to a particular relay, contactor, or auxiliary load. Qualification documentation is also required.
推荐
Battery Monitoring and Diagnostic ECU
The L9679B can be evaluated for a battery-monitoring ECU that combines battery supervision with diagnostic and load-control functions. Its documented automotive battery cut-off role places it closer to the power-management boundary of the ECU, while its specialized interface classification suggests it is intended to coordinate external automotive circuits rather than perform general computation. The 100-pin package offers substantial connectivity for sensors, switching devices, and diagnostic paths. Exact measurement accuracy, diagnostic protocol, fault modes, and voltage thresholds are not present in the verified records and must be confirmed from STMicroelectronics documentation before schematic capture.
推荐
Restraint Controller Expansion Module
A restraint-controller expansion module can use the airbag-expansion capability identified for the L9679 family to extend the controller's deployment-loop interface capacity. The L9679B's 100-pin LQFP package is suited to a compact ECU where numerous squab, supply, return, and diagnostic connections must be routed on a fine-pitch land pattern. The stated 105 °C maximum rated temperature provides a useful platform check, but the record does not establish channel count, timing, fault response, or isolation requirements. These safety-critical details and the exact B-suffix qualification must be validated before hardware release.
推荐
Automotive Power-Management Subsystem
The L9679B may fit an automotive power-management subsystem where battery isolation, load supervision, and restraint-related interfaces share a centralized specialized controller. The available distributor categorization identifies it as a power-management SPS ASSP rather than a general-purpose logic IC, and the LQFP-100 package provides the connection density expected in a multifunction vehicle ECU. This integration can improve routing consistency and reduce duplicated interface circuitry. The verified data does not specify internal regulators, switching channels, electrical limits, or diagnostic behavior, so engineers must use the manufacturer datasheet to determine whether it fits the intended power architecture.
推荐
工程参考数据： L9679B ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | L9679E |
|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics |
| Package | LQFP-100 (14x14x1.4 mm) | LQFP-100 (14x14x1.4 mm) |
| Device Classification | Specialized interface IC | Specialized interface IC |
| PMIC Category | Power Management Specialized | Power Management Specialized |
| Primary Function | Automotive battery cut-off and airbag-system expansion | Automotive battery cut-off and airbag-system expansion |
| Revision Designator | B | E |
关键差异点
- Exact B revision with verified distributor availability （对比 L9679E)
- Documented 100-pin automotive interface integration （对比 L9679E)
- Combined battery cut-off and airbag expansion positioning （对比 L9679E)
设计说明
Do not release the LQFP-100 land pattern from a generic 100-pin symbol. Although the package is documented as 14x14x1.4 mm, the exact exposed-pad arrangement, pin-1 orientation, pad dimensions, solder-mask limits, and paste stencil must be taken from the STMicroelectronics package drawing for the exact suffix. Confirm that every selected footprint, test point, and assembly fixture matches that drawing. This is particularly important for a safety-related automotive ECU because an incorrect pad map can affect battery cut-off or airbag interface behavior.
Treat the battery and deployment interfaces as safety-critical power paths. The supplied data confirms the L9679B's automotive battery cut-off and airbag expansion roles but does not provide operating voltage, switched-current, short-circuit, or fault-response limits. Before schematic release, obtain the exact datasheet and verify battery transients, load current, thermal behavior, external component values, and protective-device coordination. Do not infer these ratings from the stated 105 °C maximum rated temperature or from another L9679-family revision.
Do not substitute L9679E for L9679B solely because both names appear in the same family description. The source data does not establish a quantified pinout, timing, diagnostic, or protection delta between the B and E suffixes. Compare the manufacturer revision documentation, exact orderable part numbers, qualification reports, and change notices. For any production change, document the evidence that battery-management and airbag-related functions remain equivalent and obtain the platform owner's engineering approval.
Plan the LQFP-100 layout with short, orderly connections between the IC and sensitive battery or restraint-system nets. Keep high-current switching paths physically separated from low-level sensing and diagnostic routes where the application permits, and provide a continuous ground strategy appropriate to the manufacturer's reference layout. Because the supplied sources do not identify internal isolation, exposed-pad connectivity, or high-voltage isolation boundaries, those details must be established from the manufacturer guidance before final routing and isolation-clearance decisions.
合规信息
The supplied distributor and manufacturer-indexing results do not explicitly provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements for L9679B. Automotive use alone is not treated as proof of AEC-Q100 qualification.
