Tag Archives: photo

Toshiba is eyeing semiconductor test applications with a tiny photo-relay that operates at 1.6Vin “making it suitable for use with 1.8V FPGAs”, according to the company. “A resistor is built in on the primary side, enabling voltage-controlled operation.” Called TLP3412SRLA, it draws 6.6mA at the nominal operating voltage of 1.8V. Inside is a single Form-A (normally-open) ac or dc contact that ...

University of Sheffield spin-out Phlux has announced its first product, a family of 1,550nm avalanche photodiodes. Called Aura, the infra-red devices are built using antimony alloy modified InGaAs. “The resulting sensors can be operated with APD gains up to 120, enabling even the smallest signals above the noise floor of a connected trans-impedance amplifier to be amplified,” according to the ...

Toshiba has added over-temperature and over-voltage protection features to an 80V 1.4A photo-relay, all inside a 4pin DIP package. Called TLP241BP, it can switch ac or dc though its single isolate 280mΩ (max) output switch – implemented as a pair of back to back mosfets – and handle pulses up to 4.2A (100ms, 1/10 duty). Output leakage is 1μA max ...

Würth Elektronik has released a detailed and thoughtful app note on using opto-couplers, particularly ‘817’ types. AN0007a* ‘Understanding phototransistor optocouplers’ goes deep into analogue and digital uses, covering performance variations due to process, temperature voltage, current and parasitics, and appropriate design behaviour. “An essential aspect for the development of robust applications involving optocouplers is not only to understand and integrate ...

Rohm is to put short wavelength infra-red LEDs and photo diodes in 1.6 x 0.8mm (1608) packages for material detection in portable, wearable and hearable devices. “As SWIR is used to detect the presence of substances and their constituent components by taking advantage of characteristics of water, ice, gases or glucose that absorb specific wavelengths, target applications include light sources ...

Eindhoven University of Technology has made a photodiode with such low noise (<10-6mA/cm2 dark current) and wide dynamic range (<150dB), that it can optically detect a heartbeat at a distance of 1.3m. TU Eindhoven researcher Riccardo Ollearo having the pulse in his finger measured remotely by thin-film photodiode Through an unexpected photo-multiplier effect, it can achieve a photo-electron yield above ...

Toshiba has released a ±2.5A output IGBT gate driving photo-coupler with and isolated fault feedback, that can also drive mosfet gates. Called TLP5212, it “features a new totem pole output with two n-channel mosfets,” according to the company. “In addition, the photocoupler incorporates de-saturation detection, active Miller clamp, under-voltage lock-out, soft gate turn-off and a fault output.” Maximum propagation delay ...

Omron is aiming at test and measurement with a miniature 200V 350mA mosfet opto-relay. In a 3.4 x 2.1mm P-SON (power small outline no lead) package and operating across -40 to +110°C, “this device can realise a current load of 75% higher than a comparable SOP4 type relay”, said the company, justifying this with the figure 49mA/mm2 for the P-SON relay and ...

Toshiba has launched two normally open 1-form-A photo-relays that do not need more than 2mA through the input to operate. The input current “reduces energy consumption by approximately 33% when compared to existing Toshiba products such as the TLP240x series”, according to the company. There are two parts: TLP223GA 400Vmax 120mA 17Ω output turn-on 1ms max (50% of TLP240GA) TLP223J 600Vmax ...

Toshiba has introduced a photo-relay capable of operating with 1.5kV across its output switch – the company’s first with such an output withstand voltage – “ensuring that it is compatible with the vast majority of traction batteries”, it said. AEC-Q101 qualified and aimed at battery management systems, TLX9160T consists of an infra-red emitting diode optically coupled to back-to-back photo-mosfets. Although intended ...