C7247-23

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Product Specifications: Hamamatsu C7247-23

Category	Parameter	Specification / Description
General Information	Product Code	C7247-23
	Product Type	Photomultiplier Tube Assembly with Integrated Voltage Divider and Cooler
	Variant Description	The `-23` suffix indicates a C7247 PMT pre-assembled with a voltage divider circuit and a thermoelectric cooler (TEC). This is a complete module for low-noise NIR detection.
Core PMT (C7247)	Type	Head-On Type with Multialkali Photocathode
	Effective Area	Diameter: 51 mm (2 inches)
	Spectral Response Range	300 nm to 850 nm (Extended Red / NIR response)
	Dynode Structure	Venetian Blind (10 stages)
Integrated Circuit	Component	Voltage Divider (Bleeder Circuit)
	Function	Provides the correct graded voltage to each dynode from a single high-voltage input.
Cooling System	Component	Integrated Thermoelectric Cooler (Peltier Element)
	Primary Function	Cools the PMT to reduce thermionic emission (dark current).
	Typical Temperature	May cool to -20°C to -30°C below ambient (exact value specified by datasheet).
	Power Requirements	Requires a separate, stable DC power supply for the TEC (e.g., +12V, ±5V).
Gain	Typical Value	1 x 10<sup>6</sup> (at recommended operating voltage)
Voltage	Operating Voltage (HV)	-1000 V DC (Typical; defined by the integrated divider)
	Polarity	Negative High Voltage (Cathode)
	Input	Via a multi-pin connector on the assembly.
Performance	Dark Current (Typical)	Dramatically reduced. Example: 1-5 nA (at rated voltage, with cooler active). (This is the primary purpose and benefit of the -23 variant)
	Anode Luminous Sensitivity	40 μA/lm (Typ., at 2856 K)
	Rise Time	14 ns
Mechanical	Configuration	PMT, voltage divider, and TEC are assembled into a single integrated module.
	Connectors	Multi-pin connector for HV input, TEC power, and potentially a temperature sensor. BNC connector for analog output.
	Key Advantage	Provides a complete, optimized solution for ultra-low-light NIR detection.
	Magnetic Shielding	May or may not be included. This must be confirmed via the datasheet.
Environmental	Operating Temperature	Specified for the baseplate/case of the assembly (e.g., 0 °C to +50 °C).
Applications		Ultra-low-light Spectroscopy, Sensitive Fluorometry, Raman Spectroscopy, LIDAR, Biomedical Research.