The M54534P and M54534FP each have six circuits consisting of NPN transistors. Each input has a diode and 1.6k esistor in series. Each input is connected, and each output is connected spike-killer clamping diode, emitters of each transistor is connected to GND (pin 8), strobe input is connected to (pin 1), clamping diode is connected COM pin (pin 9) and V CC is connected to the pin 16 in common. The collector current is 320mA maximum. Collector-emitter supply voltage is 20V maximum. M54534FP is enclosed in a molded small flat package, enabling space-saving design.