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ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC Circuit and Device Technology

Replaces mechanical relays and MOSFETs fulfilling functional safety requirements in the automotive and industrial equipment applications.

ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

ROHM released a new generation of 1 channel and 2 channel 40 V Intelligent (Smart) Low Side Switches: the BV1LExxxEFJ-C and BM2LExxxFJ-C series. The two product families are ideally designed for automotive and industrial applications. They are AEC-Q100 qualified and are suitable for systems such as car body control, engine and transmission control units, LED lighting modules or industrial PLC (programmable logic controllers).


ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

The growing number of electronic components and digitalization of various types of equipment is driving the need to shrink the application solution size and to reduce the bill-of-materials (BOM). Besides, global issues such as CO₂ emissions, or global trends such as autonomous driving, lead to stricter requirements and more complex architectures that demand an increased safety and robustness level. Conventional discrete solutions involving mechanical relays or MOSFETs can no longer meet these requirements and cannot provide protection against system failures. With greater demand for high integration, added safety features, build-in intelligence and diagnostic features, Intelligent Power Devices (IPD), also called smart switches, become an essential part for electronic systems in a continuously growing market.

ROHM addressed these market needs early on – by having developed a dedicated Smart Power process in 2014. Bringing together innovation, power efficient technology, process optimization and analog design experience, allows ROHM to offer a broad lineup of high-performance products. The integrated over-temperature, over-current and over-voltage protections, built-in diagnostic features and micro-controller feedback grant enhanced performance and reliability, superior lifetime and reliability over discrete solutions.


ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

The BV1LExxxEFJ-C and BM2LExxxFJ-C family of products are Intelligent Low Side Devices that integrated all of the above and can switch currents for any type of resistive, capacitive or inductive loads. When switching off an inductive load, the power MOSFET inside the smart switch needs to dissipate all the magnetic energy stored previously in the inductor’s magnetic field. During this time the device protects itself by actively clamping the voltage to a safe level. The power dissipated, generates heat that is distributed on the integrated power MOSFET’s surface. ROHM’s new products are the industry’s first to combine heat suppression with low ON resistance (difficult to achieve in a compact size), by optimally controlling the number of current-carrying channels using proprietary TDACC™ circuit and device technology. TDACC™ offers increased integration capability, allowing ROHM to report the industry’s first 2 channel 40mΩ (ON resistance) product in the compact SOP-J8 package.

A wide range of ON-resistance values (40/80/160/250mΩ) in both 1 channel and 2 channel configurations are offered to meet diverse customer needs. Furthermore, the contact discharge tolerance of all the products in the family is higher than that of other standard products. This adds to a safer operation inside various electronic equipment types.

Taking advantage of the TDACC™ technology, ROHM will continue to develop Intelligent Power Devices with lower ON resistance and a higher level of feature integration. This will allow ROHM to expand its product portfolio confirming its high-quality commitments towards customer needs with higher performance products, increased functionality, outstanding energy efficiency, cost reduction and higher safety.

Comparison of Contact Discharge Tolerance:
New vs. Standard Products

ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

ROHM’s Intelligent Switch Lineup

ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

New Product Lineup

ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

About the ComfySIL™ Brand
ROHM launched the ComfySIL™ brand of products for stakeholders and customers involved with functional safety design that can contribute to the safety, security, and comfort of social systems. ComfySIL™ is awarded to products that conform to the ComfySIL™ concept for functional safety not only in the automotive field, but in the industrial equipment market as well.

ComfySIL™ Website: https://www.rohm.com/functional-safety

ComfySIL™ is a trademark or registered trademark of ROHM Co., Ltd.

Application Examples

  • BCMs (Body Control Modules), interior/exterior lamps, engine, transmission, and other automotive electrical systems
  • Industrial equipment such as PLCs (Programmable Logic Controllers)

Suitable for a wide range of applications in addition to the automotive and industrial systems.

Online Sales Information
Sales Launch Date: February 2023
Online Distributors: Digi-Key, Mouser, and Farnell

Scheduled for release at otheronline distributors as well.

Comparison with Common Switches
vs. Mechanical Relays


ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

vs. MOSFETs

ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

Comparison of Smart High Side /Low Side Switches

ROHM’s New Compact Intelligent (Smart) Low Side Switches: Reduced Power Loss and Safer Operation Using Proprietary TDACC™ Circuit and Device Technology

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