S11865-128

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Parameter Table: S11865-128 Photomultiplier Tube (PMT)

The following table lists the key electrical, optical, and mechanical parameters for the Hamamatsu S11865-128 PMT module.

Parameter Category	Parameter	Symbol	Value / Condition	Unit	Notes
General	Model Number	—	S11865-128	—	12-stage, head-on type
	Product Type	—	Photomultiplier Tube Module	—	Includes socket and voltage divider circuit
Optical Characteristics	Photocathode Material	—	Bialkali (Sb-Rb-Cs, Sb-K-Cs)	—	High sensitivity and low noise
	Spectral Response Range	λ	300 to 650	nm	—
	Peak Wavelength	λₚ	420	nm	—
	Cathode Luminous Sensitivity	Sₖ	min. 80	μA/lm	@ 2856 K tungsten lamp
	Anode Luminous Sensitivity	Sₐ	min. 50	A/lm	@ 2856 K tungsten lamp, Vᵣ = 1000 V
	Dark Current	I_d	max. 3	nA	@ Sₐ = 100 A/lm, Vᵣ = 1000 V
Electrical Characteristics	Supply Voltage	Vᵣ	1000 (Typical)	V DC	Operating range: 700 – 1250 V
	Average Anode Current	I_a	max. 100	μA	—
	Linearity	—	±0.8	%	@ 100 μA output current
	Rise Time	t_r	2.2	ns	—
	TTS (Transit Time Spread)	σ	1.5	ns	—
Mechanical Characteristics	Window Material	—	Borosilicate Glass	—	—
	Bulb Material	—	Kovar Glass	—	—
	Base / Socket	—	8-pin (Octal)	—	IEC 60067 / JEDEC 1A
	Dimensions (Dia. x L)	—	28 x 48 (Typical)	mm	Excluding pins
Environmental & Other	Operating Temperature	T_op	-30 to +50	°C	—
	Storage Temperature	T_stg	-40 to +70	°C	—
	Weight	—	approx. 35	g	—