Star Micronics PR921-24-A * Soldering Time: Within 5 seconds, Electrical Characteristics (at 25C), *1: No reflective material. *2: D is the thickness of the reflective mirror glass.

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4.3 Paper Detector General Specifications
The paper detector is composed of a reflective sensor and generates a set/reset signal.
Absolute Maximum Rating (at 25°C)
Items Symbol Rating Units
Reverse Voltage VR 6 V
Forward Current IF 50 mA
Tolerance Loss PD 75 mW
Voltage Between Collector - Emulator VCE0 35 V
Collector Current IC 20 mA
Collector Loss PC 75 mW
Total Tolerance Loss Ptot 100 mW
Operating Temperature Topt -25 to +85 °C
Storage Temperature Tstg -40 to +100 °C
* Soldering Temperature Tsol 260 °C
* Soldering Time: Within 5 seconds
Light Emit-
ting Side
Light Recep-
tion Side
Electrical Characteristics (at 25°C)
Item Symbol Conditions MIN TYP MAX Units
Forward Voltage VF IF = 20 mA 1.2 1.4 V
Reverse Current IR VR = 3 V 10 µm
Dark Current ICEO VCE = 20 V 1 100 nA
Optical Current IC IF =20 mA, VCE =5V 1.0 3.0 mA
* 1 Leaked Current Ileak IF =20 mA, VCE = 5V 500 nA
Response Time (Rise) tr
VCE=2V, IC=100 µA
50 150 µs
Response Time (Fall) tf
RL =1000 Ω , D =4 mm
50 150 µs
(*2)
*1: No reflective material.
*2: D is the thickness of the reflective mirror glass.
Input Char-
acteristics
Joining Characteristics
Output Char-
acteristics