NOVOSENSE Microelectronics has launched the SP301H/L, a family of three-channel digital isolators built on the company’s third-generation capacitive isolation technology and aimed at RS485 communication links. By integrating three isolation channels onto a single chip, the part replaces the three optocouplers and supporting passives that conventional isolated RS485 designs rely on.
The data channel runs at up to 8 Mbps and the enable control channel at up to 1 Mbps, faster than typical optocoupler-based RS485 isolation manages. NOVOSENSE offers two enable-logic options: the SP301H ships with a default-high enable pin and the SP301L with a default-low pin, giving designers flexibility in the MCU enable logic. Both come in a compact SSOW10 wide-body package with fine-pitch leads, which the company says reduces PCB area by more than 60% compared to optocoupler-based solutions. Operating ambient temperature runs from –40° C to 125° C, and the company says a low quiescent current makes the part suitable for battery-powered field instruments.
The SP301H/L supports a withstand voltage up to 5 kVrms for one minute and surge capability exceeding 10 kV, meeting reinforced insulation requirements, according to the company. Common-mode transient immunity reaches a typical 200 kV/μs. Compared to the previous SP301A and NIRS31 series, NOVOSENSE says the new parts improve electrical overstress (EOS) tolerance by about 10% and keep latch-up immunity above 10 V. The company also cites improved power-supply noise immunity, which it says keeps communication error-free under high-frequency, high-amplitude system noise in the MHz range.
NOVOSENSE positions the SP301H/L within its Isolation+ line of digital isolators, isolated sensors, interfaces, power supplies and gate drivers.
RS485 nodes in equipment like power meters, industrial automation systems and energy storage often sit far apart at different ground potentials, and a digital isolator blocks those potential differences and surges while passing the signal. An optocoupler does the same job by coupling signals through an LED, but its output dims over years of operation, shifting timing and eventually limiting service life. A capacitive isolator has no such wear-out mechanism, and folding three channels into one chip cuts the bill of materials and board routing that a discrete optocoupler design needs.
Source: NOVOSENSE
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