Comparing photorelays just became easier, with a compact development board helping engineers evaluate switching performance, isolation and package options before final design decisions.
MIKROE has introduced the Opto 8 Click Board, a development board that places two different Toshiba PhotoMOS photorelays side by side, enabling engineers to compare their performance directly for applications requiring reinforced galvanic isolation between MCU input and output stages. The board features two TLP3640A and two TLP3122A photorelays, allowing simultaneous control of higher-current loads such as DC motors.
Both photorelays use integrated MOSFETs with low on-state resistance and can withstand up to 60V in the off-state. The TLP3640A delivers a continuous on-state current of 1A, while the TLP3122A supports 1.4A. The smaller TLP3640A is housed in a four-pin SO4 package, whereas the TLP3122A uses a slightly larger four-pin SO6 package for applications requiring higher current capability.
The TLP3640A provides pulsed current up to 3A, typical RDS(ON) of 0.14Ω, and switching times of 0.5ms (on) and 0.2ms (off). The TLP3122A increases pulsed current capability to 4.2A, reduces RDS(ON) to 0.13Ω, and offers switching times of 3ms (on) and 1ms (off). Both devices feature 3,750Vrms minimum isolation, are approved to UL1577, recognised by cUL and approved by VDE, and operate across a temperature range of −40°C to 110°C.
The board is supplied with software libraries, example code and support for the mikroSDK development framework, including open-source libraries and a unified API to simplify application development and reduce time to market. It is intended for analogue interface circuits, programmable logic controllers, measurement equipment and other industrial systems requiring reliable isolated switching.
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