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The BAV99L-AQ from Diotec is a dual small signal diode designed for universal use in 48 V telecom backup systems and (hybrid) electric vehicle ([H]EV) battery management systems (BMS). With a switching time of under 4 nanoseconds, a peak reverse voltage of 100 V and a forward current of 2 × 125 mA, it protects sensitive components while enabling reliable, high-speed logic paths.

Battery Management Systems play a critical role in multi-cell configurations, maximizing safety, reliability, and battery lifespan.

They monitor state of charge (SOC) and state of health (SOH), and prevent thermal risks, over/under voltage, overcurrent, short circuits and overheating. They also manage cell balancing, control charge/discharge and communicate with chargers or control units.

The BAV99L-AQ is perfectly suited for these tasks:

• Steering fast transients to ground or battery rails in rail clamp configurations
• Protecting microcontrollers, sensors, and MOSFETs from voltage spikes
• Free-wheeling small relay coils (forward surge capability 1 A for 1 ms)
• Isolating signals from reverse currents at sensor outputs or gateway ports

Its low capacitance (<2 pF) and ultra-fast switching make it ideal for distribution logic, alarm limits, and status flags. The fully AEC-Q101-qualified BAV99L-AQ is available in high volumes and provides a reliable, high-performance solution for automotive and telecommunications applications.

Key Features:

• Dual diodes in series configuration
• High-speed switching (<4 ns)
• AEC-Q101 qualified

Applications:

• Automotive electronics and digital dashboards
• Infotainment systems
• Telecom backup supplies
• Lighting controls

Specifications:

•  Repetitive reverse voltage (VRRM): 100 V
• DC blocking voltage (VDC): 75 V
• Average forward current: 125 mA with both diodes loaded, or 250 mA with a single diode loaded.
• Typical forward voltage (VF): <0.855 V at 10 mA, 25°C
• Package: SOT-23