L9965P-FP-TR - Single Channel Pyro-Fuse Driver | STMicroelectronics
MPN： L9965P-FP-TR ✓ 啟用中L9965P-FP-TR 概覽
A pyro-fuse driver is a specialized safety IC in the power management category that interfaces the battery management system (BMS) or airbag control unit to a pyrotechnic disconnect element. Its job is to deliver a precisely controlled energy pulse to the initiator, rapidly opening the high-current battery loop when a crash or fault is detected, before conventional contactors can react. This places the pyro-fuse driver in the safety-critical branch of the vehicle electrical system, sitting between the BMS microcontroller and the high-voltage bus.
Key features include integrated HS+LS powerMOS output stage, automotive-grade qualification, single-channel architecture, and a thermally enhanced TQFP-32 package with exposed pad for board-level heat spreading. The dual-FET topology lets the device source and sink current through the initiator, which improves switching symmetry and reduces residual magnetic energy. The L9965P is intended to operate alongside a host microcontroller that commands ignition via a logic-level trigger.
Typical applications include high-voltage battery disconnect in BEV (battery electric vehicle) and HEV (hybrid electric vehicle) powertrains, e-fuse replacement for crash-triggered isolation, and pyrotechnic safety circuits coordinated with airbag ECUs. The 32-TQFP footprint is compatible with standard reflow profiles used in automotive PCB assembly.
Designers should follow the reference schematic and PCB layout in the ST evaluation board EVL9965P-N. The exposed pad must be soldered to a sufficient copper pour to keep junction temperature within automotive limits during the brief but high-current ignition event. Loop inductance of the initiator traces should be minimized to avoid voltage overshoot on the FET outputs.
直接替換替代品，適用於 L9965P-FP-TR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： L9965P-FP-TR （相同外形與佔位） — 差異在於 Output Stage, Package, Product Type, RoHS Status.
L9965P-FP
✅ 直接替換聯絡詢價
查看資料表 →L9965P-FN-TR
✅ 直接替換聯絡詢價
查看資料表 →L9965P-FN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
L9965P-FP-TR 規格
| Product Type | Single-channel pyro-fuse driver |
| 拓撲 | Dual FET (HS + LS) powerMOS output stage |
| Number of Channels | 1 |
| 封裝 | TQFP-32 (7x7 mm) with exposed pad |
| 安裝類型 | Surface Mount |
| Automotive Grade | Yes (automotive-qualified per ST product page) |
| Operating Mode | Triggered single-shot energy pulse to pyrotechnic initiator |
| Output Stage | Integrated high-side + low-side powerMOS |
| Trigger Input | Logic-level command from host MCU |
| Application Domain | High-voltage battery disconnect, crash-triggered isolation |
| Compatible Evaluation Board | EVL9965P-N |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes (per ST product family standard) |
L9965P-FP-TR tqfp-32 (7x7 mm) with exposed pad 腳位配置指南
L9965P-FP-TR（tqfp-32 (7x7 mm) with exposed pad 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： L9965P-FP-TR.
請參閱 資料表 以查看完整腳位配置。
典型應用
L9965P-FP-TR 適用於 6 應用s: BEV/HEV High-Voltage Battery Disconnect, Crash-Triggered Pyrotechnic Isolation, Pyrotechnic E-Fuse Replacement, EV Battery Management System (BMS) Safety Subsystem, Industrial High-Voltage Disconnect Systems, Safety ECU Integration with Airbag Controller.
BEV/HEV High-Voltage Battery Disconnect
The L9965P-FP-TR is purpose-built to drive a pyrotechnic initiator that physically severs a high-voltage battery busbar during a crash or short-circuit event in battery electric and hybrid vehicles. Its integrated HS+LS powerMOS output stage delivers the controlled energy pulse required by the initiator with sub-millisecond response, far faster than mechanical contactors. The 32-TQFP package with exposed pad dissipates the brief but high-current ignition pulse while keeping junction temperature within automotive limits when soldered to adequate copper.
推薦
Crash-Triggered Pyrotechnic Isolation
In a crash event, the L9965P-FP-TR is commanded by the airbag ECU or BMS controller to fire the pyro-fuse initiator within microseconds of crash detection, isolating the high-voltage system from the rest of the vehicle before rescue operations begin. The dual-FET output stage provides both source and sink current paths through the initiator, ensuring symmetric switching and minimal residual magnetic energy. The automotive-grade qualification and the safety-critical design of the output stage make it suitable for ASIL-rated systems.
推薦
Pyrotechnic E-Fuse Replacement
The L9965P-FP-TR replaces slower electromechanical e-fuses in next-generation EV battery packs by providing a one-shot, ultra-fast disconnect mechanism with no moving parts. The HS+LS powerMOS stage simplifies the external circuitry by eliminating the need for separate high-side and low-side drivers, while the TQFP-32 footprint enables compact PCB placement near the initiator. Compared with semiconductor-only e-fuses, the pyro-fuse approach avoids continuous conduction losses and thermal stress in normal operation.
推薦
EV Battery Management System (BMS) Safety Subsystem
Inside a high-voltage BMS, the L9965P-FP-TR is paired with a host microcontroller and current-sensing circuitry to form a dedicated safety subsystem that monitors for short-circuit or crash events and triggers pyrotechnic isolation. The integrated dual-FET stage accepts a logic-level command from the MCU and converts it into the high-current pulse required by the initiator, freeing the host from managing high-current switching directly. The 32-TQFP footprint integrates cleanly alongside other BMS ICs on a single safety board.
推薦
Industrial High-Voltage Disconnect Systems
Outside of passenger vehicles, the L9965P-FP-TR can serve in industrial high-voltage battery banks, energy-storage systems, and railway traction battery packs where rapid crash-equivalent isolation is required. The automotive-grade qualification provides margin in harsh industrial environments, while the TQFP-32 package is compatible with standard SMT lines used in industrial assembly. The dual-FET output stage supports reliable one-shot triggering under wide operating conditions.
推薦
Safety ECU Integration with Airbag Controller
The L9965P-FP-TR is often co-located with an airbag control unit on the vehicle's safety ECU, sharing crash sensor inputs to coordinate airbag deployment with high-voltage battery isolation. Its logic-level trigger interface accepts a single GPIO-style command from the airbag MCU, while the HS+LS output stage handles the heavy current pulse to the initiator. The exposed-pad TQFP-32 package dissipates the brief ignition pulse without requiring an external heatsink.
推薦
推薦產品摘要
工程參考資料，適用於 L9965P-FP-TR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | L9965P-FP | L9965P-FN-TR | L9965P-FN |
|---|---|---|---|---|
| Package | TQFP-32 (7x7 mm) | TQFP-32 (7x7 mm) - same | VFQFPN-32 (5x5 mm) - different package | VFQFPN-32 (5x5 mm) - different package |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Product Type | Single-channel pyro-fuse driver | Single-channel pyro-fuse driver | Single-channel pyro-fuse driver | Single-channel pyro-fuse driver |
| Output Stage | Integrated HS + LS powerMOS | Integrated HS + LS powerMOS | Integrated HS + LS powerMOS | Integrated HS + LS powerMOS |
| Automotive Grade | Yes | Yes | Yes | Yes |
| Carrier Format | Tape & Reel | Tube | Tape & Reel (QFN) | Tube (QFN) |
| Compatible Evaluation Board | EVL9965P-N | EVL9965P-N | EVL9965P-N | EVL9965P-N |
| Datasheet | l9965p.pdf | l9965p.pdf | l9965p.pdf | l9965p.pdf |
主要差異化特點
- Integrated HS+LS powerMOS output stage (對比Discrete pyro-fuse driver using external FETs)
- Automotive-grade qualification (對比Industrial-grade pyro-fuse drivers)
- TQFP-32 footprint with exposed pad (對比Non-TQFP competitor packages)
設計說明
The L9965P-FP-TR TQFP-32 package includes an exposed thermal pad that must be soldered to a continuous copper pour on the PCB. Although the pyro-fuse event is single-shot and brief, the high peak current through the HS+LS powerMOS stage creates localized heating. ST's EVL9965P-N reference design uses a multi-layer board with at least 1 square inch of top-layer copper tied to the exposed pad to keep junction temperature rise within automotive derating limits.
Minimize loop inductance between the L9965P-FP-TR output pins and the pyrotechnic initiator by routing the HS and LS paths as a tight, symmetric differential pair with wide traces. According to ST's datasheet, residual inductance can cause voltage overshoot across the powerMOS outputs that may exceed the device ratings. Place a decoupling capacitor as close as possible to the device supply pin and follow the EVL9965P-N reference layout for first-pass success.
Do not use the L9965P-FP-TR as a continuously-conducting switch; it is designed for single-shot, triggered ignition events only. Repeated or prolonged activation will exceed the safe operating area of the integrated powerMOS stage. Designers must also ensure the host MCU provides a clean, debounced trigger command and that the system-level safety case prevents accidental firing during maintenance or vehicle service.
Keep the trigger logic traces (MCU GPIO to L9965P-FP-TR EN/TRIG input) physically separated from the high-current initiator traces to avoid coupling noise into the command path. According to ST's reference documentation, a ground guard trace around the logic-level inputs improves noise immunity. Use the EVL9965P-N evaluation board layout as the gold-standard reference for production PCB designs.
合規資訊
Automotive-grade per ST product page. AEC-Q100 qualification assumed from automotive positioning; verify exact grade in datasheet. RoHS/REACH compliance inferred from ST standard product family practice.
