ROHM Develops Breakthrough Schottky Barrier Diode Combining Low VF and IR for Advanced Image Sensor Protection

ROHM has developed an innovative Schottky barrier diode that overcomes the traditional V_F / I_R trade-off. This way, it delivers high reliability protection for a wide range of high-resolution image sensor applications, including ADAS cameras.

Modern ADAS cameras and similar systems require higher pixel counts to meet the demand for greater precision. This has created a growing concern – the risk of damage caused by photovoltaic voltage generated under light exposure during power OFF. While low-V_F SBDs are effective countermeasures, low I_R is also essential during operation to prevent thermal runaway. However, simultaneously achieving both low V_F and I_R has been a longstanding technical challenge. ROHM has overcome this hurdle by fundamentally redesigning the device structure – successfully developing an SBD that combines low V_F with low I_R which is ideal for protection applications.

The RBE01VYM6AFH represents a novel concept: leveraging the low-V_F characteristics of rectification SBDs for protection purposes. By adopting a proprietary architecture, ROHM has achieved low I_R that is typically difficult to realize with low V_F designs. As a result, even under harsh environmental conditions, the device meets market requirements by delivering V_F of less than 300mV (at I_F=7.5mA even at Ta=-40°C), and an I_R of less than 20mA (at V_R=3V even at Ta=125°C). These exceptional characteristics not only prevent circuit damage caused by high photovoltaic voltage generated when powered OFF, but also significantly reduce the risk of thermal runaway and malfunction during operation.

The diode is housed in a compact flat-lead SOD-323HE package (2.5mm × 1.4mm) that offers both space efficiency and excellent mountability. This enables support for space-constrained applications such as automotive cameras, industrial equipment, and security systems. The RBE01VYM6AFH is also AEC-Q101 qualified, ensuring suitability as a protection device for next-generation automotive electronics requiring high reliability and long-term stability.

Going forward, ROHM will focus on expanding its lineup with even smaller packages to address continuing miniaturization demands.

Application Examples
Image sensor-equipped sets such as ADAS cameras, smart intercoms, security cameras, and home IoT devices.

Online Sales Information
Applicable Part No: RBE01VYM6AFHTR
Online Distributors: DigiKey, Mouser and Farnell
The products will be offered at other online distributors as they become available.

Terminology
Photovoltaic Voltage
A term commonly used with optical sensors, referring to the voltage produced when exposed to light. In general, the stronger the light intensity or higher the pixel count the greater voltage generated.

Credit: Rohm