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MSM Photodetector

G4176-01

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HAMAMATSU realized MSM (Metal-Semiconductor-Metal) Photodetectors having ultrafast responses.
The GaAs MSM Photodetector G4176 features 30ps response time for both rise & fall while keeping a low dark current (100 pA at Ta=25 ーC). The rise time of the InGaAs MSM Photodetector G7096 is 40ps.
Symmetrical and interdigital Schottky contacts are fabricated at the sensitive area, whose size can be larger than other kinds of fast response photodetectors. This makes easier to set up with optics. Therefore, MSM Photodetectors are suited for measurements of optical high-speed waveform and optical communications.

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Absolute maximum ratings

(Ta = 25 ℃)

  Item Symbol Condition Value Unit
  Bias voltage Vb - ±10 V
  Peak input light Φ Pulse width幅≦1 ns *1 50 *2 mW
  Pulse width>1 ns 5 *2 mW
  Operating temperature Top(a) - -40 to +85
  Strage temperature Tstg - -40 to +85

*1 Duty ratio should be less than 50 %.(Even if the pulse width is 1 ns, when the duty ratio is >50 %, pulse width >1 ns is applied.)
*2 This value is under the condition that the light irradiate the whole effective area (200 μm ) uniformly.
When the irradiated area is smaller than effective area of the detector, the peak input light becomes smaller in proportional to the irradiate area.

General characteristics

(Ta=25 ℃)

  Item Symbol Condition Value Unit
  Spectral response range λ Vb = 7 V 450 to 870 nm
  Peak response wavelength λp Vb = 7 V 850 nm
  Effective sensitive area A - 0.2 × 0.2 mm2
  Chip size - - 1 × 1 mm2
  Package - - TO-18 -

Electrical and optical characteristics

(Ta=25 ℃、Vb=7 V)

  Item Symbol Condition Value Unit
  Min. Typ. Max.
  Radiant sensitivity S λ = 850 nm 0.2 0.3 - A/V
  Dark current Id - - 100 300 pA
  NEP *3 - λ = 850 nm 0.2 ×10-15 4 ×10-15 - W/Hz1/2
  Terminal capacitance *4 Ct - - 0.5 0.6 pF
  Rise time tr 10 % to 90 %
(design value) *5
- 50 - ps
  Fall time tf 10 % to 90 %
(design value) *5
- 50 - ps

*3 Noise equivalent power
*4 Value of chip only
*5 Values excluding response time of light source, bias tee, assembly circuit, oscilloscope etc

Optical Pulse Response, Spectral Response

Optical Pulse Response(left), Spectral Response(right) 

G4176-01 パルス応答波形例、分光感度特性

Dimensional Outlines

Dimensional Outlines (Unit : mm) 

G4176-01 外形寸法図
The contents are as of March 2013. Specifications are subject to change without notice. 

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