S1226-18BK

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Hamamatsu S1226-18BK Photodiode with Built-in Amplifier Specifications

Parameter Category	Parameter	Specification / Value	Notes / Conditions
General Model Info	Product Type	Silicon PIN Photodiode with I-V Amplifier	Current-to-Voltage conversion onboard.
	Model Variant	S1226-18BK	The “18” indicates the ultra-high gain code. The “BK” suffix indicates a black epoxy mold.
	Detector Type	Silicon PIN Photodiode
	Amplifier Type	Built-in Op-Amp Circuit
Optical Characteristics	Spectral Response Range	320 nm to 1000 nm	Visible to near-infrared light.
	Photosensitive Area Size	0.8 mm² (Typ.)
	Peak Wavelength (λ<sub>p</sub>)	730 nm (Typ.)
	Radiant Sensitivity at λ<sub>p</sub>	0.45 A/W (Typ.)
Electrical Characteristics (Amplifier)	Supply Voltage (V<sub>DD</sub>)	+5 VDC (Absolute max: ±6 V)	Designed for single +5V operation.
	Supply Current	0.8 mA (Typ.)	Low power consumption.
	Output Voltage Range	0.1 V to 4.0 V	V<sub>DD</sub> = +5V. Rail-to-rail output.
	Output Impedance	1 Ω (Typ.)	Can drive loads directly.
	Conversion Gain (Transimpedance)	1.0 x 10<sup>8</sup> V/A (100 MV/A)	Fixed gain of 100,000,000. This is the key differentiator. Output is 1V per 10nA of photocurrent.
	Output Voltage Temperature Coefficient	±0.06 %/°C (Typ.)
	Bandwidth (-3dB)	~10 Hz (Estimated, Typ.)	C<sub>L</sub> ≤ 100 pF. Very low bandwidth due to ultra-high gain. For static or slowly changing light.
	Dark Output Voltage	2 mV (Typ.)	V<sub>DD</sub> = +5V, E<sub>v</sub> = 0 lx.
	Noise Equivalent Power (NEP)	Very Low	Suitable for detecting extremely faint signals.
Mechanical & Environmental	Package	4-pin Plastic Mold	Pins: 1=Vout, 2=GND, 3=NC, 4=Vdd
	Window Material	Black Epoxy (Light Blocking)	“BK” model. Reduces crosstalk and stray light interference.
	Operating Temperature	-10 °C to +60 °C
	Storage Temperature	-25 °C to +65 °C
Key Features		• Integrated Amplifier & Photodiode • Single +5V Supply Operation • Ultra-High Gain (100 MV/A) • Extremely High Sensitivity • Black Package for Stray Light Reduction • Voltage Output	Designed for detecting extremely low-light levels (near dark current limits).