APS1551SZ

Data Rate:	50Mbps
Supplier Device Package:	6-SO, 5 Lead
Package / Case:	6-SOIC (0.173", 4.40mm Width), 5 Leads
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 105°C
Voltage - Supply:	4.5 V ~ 5.5 V
Current - DC Forward (If) (Max):	25mA
Voltage - Forward (Vf) (Typ):	1.6V
Rise / Fall Time (Typ):	4ns, 5ns
Propagation Delay tpLH / tpHL (Max):	30ns, 30ns
Series:	--
Current - Output / Channel:	10mA
Output Type:	Push-Pull, Totem Pole
Input Type:	DC
Common Mode Transient Immunity (Min):	15kV/µs
Voltage - Isolation:	3750Vrms
Inputs - Side 1/Side 2:	1/0
Number of Channels:	1
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionOptoisolators, also known as photocouplers, are optoelectronic components that typically consist of an optical signal receiver and a signal transmitter. they provide excellent electrical isolation while allowing signals to pass from one side of the device to the other. Optoisolators-Logic Output are opto-isolators specifically designed to meet the requirements of digital logic applications. The APS1551SZ is an bright LED optoisolator-Logic output with a built in zener transistor array. It is a single-channel, dual-{function,output} opto isolator with an accumulating pulse time delay feature. DescriptionThe APS1551SZ is a single-channel, logic output type optoisolator, which combines an IR LED and a zener transistor array on a single chip. The bright LED version, which is based on the standard APS1551SZ, uses a high luminous intensity LED for greater isolation distances. This increased LED brightness makes it well suited for applications with long wire lengths, such as machine automation systems. The operating voltage of the APS1551SZ is typically 5 to 20 V, and its isolation voltage is rated up to 4000 Vrms. The output transistor is a single zener diode that is connected in open-collector form. The current handling capabilities of the zener diode are 3.5 mA for the high output state and 0.2 mA in the low output state (depending on the application voltage). The APS1551SZ also features an accumulative pulse time delay function. This feature allows for a signal input from one side to be stored and output after a set delay time - typically one second or longer. The accumulated pulse time delay is adjustable and can be set according to the specific application needs. ApplicationsThe APS1551SZ is a highly reliable optoisolator-logic output module designed for a wide range of applications, including machine automation systems, office automation systems, limit switch applications, industrial robots, and elevators. It can also be used in aerospace, medical, and automotive applications. The APS1551SZ is well suited for digital logic circuits with SPDT (single-pole, double-throw) switches. It can provide an output signal even with a noisy input signal due to its pulse cumulate feature. The APS1551SZ is also well suited for applications that require a high isolation of up to 4,000 Vrms.Working PrincipleThe APS1551SZ works by using an internal diode array, comprising of an LED and a Zener diode, to isolate the input and output sides of the device. When a signal is applied to the input side, light from the LED travels across the sealed package, activating the Zener diode on the output side of the device. This results in a digital output that corresponds to the input state of the device - for example a high or low voltage signal.The accumulative pulse time delay feature of the APS1551SZ is useful in providing a delayed response to switching input signals. The feature helps reduce noise in the system, as it allows the signal input to be stored and output over a set time frame- typically one second or longer, which makes it suitable for applications with long wire runs.ConclusionThe APS1551SZ is a reliable single-channel, dual-function opto isolator with an accumulative pulse time delay feature. It is suitable for a wide range of applications, including machine automation systems, office automation systems, limit switch applications, industrial robots, and elevators. Its high isolation rating of up to 4,000 Vrms makes it ideal for applications requiring noise reduction and signal strength. Moreover, its accumulated pulse time delay feature allows it to store and output signals over a set time, allowing for a more reliable operation in systems with long wire lengths.

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