PS2501AL-1-E3-H-A

Output Type:	Transistor
Supplier Device Package:	4-SMD
Package / Case:	4-SMD, Gull Wing
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 100°C
Vce Saturation (Max):	300mV
Current - DC Forward (If) (Max):	30mA
Voltage - Forward (Vf) (Typ):	1.2V
Current - Output / Channel:	30mA
Voltage - Output (Max):	70V
Series:	NEPOC
Input Type:	DC
Rise / Fall Time (Typ):	3µs, 5µs
Turn On / Turn Off Time (Typ):	--
Current Transfer Ratio (Max):	160% @ 5mA
Current Transfer Ratio (Min):	80% @ 5mA
Voltage - Isolation:	5000Vrms
Number of Channels:	1
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Optoisolators - Transistor, Photovoltaic Output

The PS2501AL-1-E3-H-A is a type of optoisolator, which is a device providing electrical insulation between circuits while maintaining digital or analog signal transmission. This particular type of optoisolator contains an insulated photovoltaic (light-sensing) output transistor, allowing it to increase noise immunity, reduce system cost, and improve electromagnetic compatibility. What sets the PS2501AL-1-E3-H-A apart from many other optoisolators is its low output voltage, no impact on bus speed, and its ability to transfer up to 150mA in continuous current.

Application Fields

The most common application for the PS2501AL-1-E3-H-A is as a noise suppressor for data communication transmission lines, such as RS-232, RS-422, and RS-485 serial ports. It is often used in systems that require high noise immunity, low current transfer, and a compact design. In addition, it is often used in embedded system controllers, noise-sensitive analog and digital circuits, computers, and telecommunications equipment. Due to its low current transfer rating, it is not suitable for driving or controlling headlights or lamps.

Working Principle

When light from a light-emitting diode (LED) hits the photodiode within the PS2501AL-1-E3-H-A, it generates sufficient voltage to turn on the output transistor. This causes current to flow from the output pin of the device, allowing it to act as a buffer between the input and output circuits and to provide electrical isolation between the two.The LED within the device is driven by a constant current through an external resistor. The LED\'s light output is monitored by the photodiode, which converts the photonic energy to a proportional electrical voltage. The photodiode then propagates this voltage to the output transistor, which is configured to activate with a small voltage input. Once the output transistor is activated, the PS2501AL-1-E3-H-A can switch current between the input and output terminals.

Conclusion

The PS2501AL-1-E3-H-A is a popular optoisolator, especially in data communication systems that require high noise immunity and a compact design. It has a low output voltage, no impact on bus speed, and is capable of transferring up to 150mA in continuous current. It works by having a LED and photodiode which creates a voltage that is sufficient to turn on the output transistor, providing electrical isolation between the input and output circuits.

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