C7247

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Product Specifications: Hamamatsu C7247

Category	Parameter	Specification / Description
General Information	Product Code	C7247
	Product Type	Head-On Type Photomultiplier Tube
	Description	A large, head-on PMT with a semi-transparent multialkali photocathode. Designed for applications requiring extended red and near-infrared (NIR) response.
Photocathode	Type	Multialkali
	Form	Semi-Transparent
	Effective Area	Diameter: 51 mm (2 inches)
	Window Material	Borosilicate Glass
Spectral Response	Peak Wavelength	~440 nm
	Response Range	300 nm to 850 nm (The critical difference from the bialkali C7246)
Dynode System	Structure	Venetian Blind (10 stages)
	Material	Cu-Be
Gain	Typical Value	1 x 10<sup>6</sup> (at 1000 V)
	Maximum	5 x 10<sup>7</sup> (at 1500 V)
Voltage	Operating Range (Anode to Cathode)	-1000 V to -1500 V DC
	Polarity	Negative High Voltage (Cathode)
	Recommended Divider Ratio	Requires an external voltage divider circuit. (e.g., Hamamatsu E1198-XX series)
Current	Average Anode Current	100 μA (max)
	Average Output Current (Linear)	10 mA (max, for pulsed operation)
Performance	Dark Current (Typical)	50 nA (at 1000 V, room temp) (Note: Significantly higher than bialkali tubes due to the multialkali cathode’s lower work function)
	Anode Luminous Sensitivity	40 μA/lm (Typ., at 2856 K)
	Cathode Luminous Sensitivity	150 μA/lm (Typ., at 2856 K)
	Rise Time	14 ns
	TTS (Transit Time Spread)	5.0 ns
Mechanical	Housing	Head-on type with stem at base
	Base	No integrated socket; requires external socket (e.g., Hamamatsu E1198-07)
	Overall Length	Approx. 135 mm
	Bulb Diameter	Approx. 58 mm
Environmental	Operating Temperature	-20 °C to +50 °C (Cooling is often used to reduce the high dark current)
	Storage Temperature	-20 °C to +60 °C
	Magnetic Shielding	Requires a mu-metal magnetic shield (e.g., Hamamatsu A50-XX) for stable operation.
Applications		Spectroscopy (NIR), Flame Detection, Blood Cell Analyzers, Fluorometry using red dyes.