Toshiba's 4-channel transistor output optocoupler enables higher insulation performance in applications

There are three functions of optocoupler :

①It is to connect circuits with different ground potentials to achieve signal transmission;

② To prevent the influence of common mode noise when a microprocessor based on weak signals needs to be used to control large loads such as motors and solenoids;

③It is to prevent the human body from directly contacting the AC power cord, achieve electrical isolation, and ensure human body safety.

The 4-channel transistor output optocouplers (hereinafter referred to as transistor couplers) TLP294-4 and TLP295-4 launched by Toshiba and put into large quantities on the market have standardized LED input threshold voltages and are packaged in SO16, which can achieve high performance in medium and low-speed insulated communication interfaces. Density installation.

Compared to Toshiba's current transistor couplers, the TLP292-4 and TLP293-4, these two products integrate a discharge resistor for storing charge at the base of the transistor, resulting in shorter transmission delay times. In terms of insulation performance, the above products have a minimum creepage distance of 5mm and a minimum isolation voltage of 3.75kVrms, and have been certified by international safety standards such as UL1577 and EN 60747-5-5. Therefore, these devices are also suitable for applications with high insulation performance requirements. Applications.

Its main features are as follows:

(1) Current transfer ratio I C / I F = 100% (minimum value)

(2) High/low level input threshold voltage: V ITH = 1V (minimum value); V ITL = 5V (maximum value)

(3) Short transmission delay time: t pHL = 50μs (maximum value); t pLH = 100μs (maximum value)

(4) Support 3750V insulation voltage

(5) Support operating temperature up to 125℃

The following are the main specifications of TLP294-4 and TLP295-4: (Unless otherwise specified, Ta = 25℃)