NJM2902BVB4 Op-Amps

Nisshinbo Micro Devices operational amplifiers have hugh immunity to prevent a failing circuit caused by interference from RF noise. Op amps and comparators are widely used for automotive applications such as amplifying small signals from various sensors and current detection. When the operational amplifier used in automotive ECUs (electronic control unit) is interfered with by external electromagnetic noises (EMI) beyond the operating frequency, the output voltage will fluctuate, and the ECU will malfunction. For this reason, operational amplifiers with high EMC performance such as one highly immune to RF noise interference are required.

The EMI of an operational amplifier generally intrudes from the input terminal with weak EMI immunity, so the EMC countermeasures of most products have been taken only for the input terminals. Compared to taking similar countermeasures on board (near the target IC), these products provide certain benefits, such as a reduction in mounting area and component costs due to configuring filters, and enhancement of margin against oscillation. However, considering the noises superimposed on the wire harness intruding from the power supply terminal of the amplifier, the interference countermeasure is not complete.

Nisshinbo Micro Devices took optimal EMC countermeasures for each stage based on the exhaustive analysis of the EMI noise intrusion path to each stage circuit of the operational amplifier, the effect on the circuit operation, and the mechanism of the malfunction. Therefore, the immunity (EMS) of the power supply terminal as well as the input terminal was successfully improved to a level that is among the leaders of the industry. Since it is a countermeasure for IC internal circuits, it is hard to be affected by the chip layout and the assembly conditions, providing stable and high EMC performance. By minimizing the risk of design rework after the noise evaluation, the products contribute to the reduction of total development costs.