MCT photoconductive detectors
P3257/P3981/P2750 series
Non-cooled type and TE-cooled type suitable
for long, continuous operation
Features
Choice of spectral response (up to 12
μm)
The band gap can be adjusted by controlling the composition
ratio of HgTe and CdTe. Utilizing this fact, various types are
available in different spectral characteristics.
Photoconductive element that decreases its resistance
by input of infrared light
Custom devices available
Custom devices not listed in this datasheet are also available
with different spectral response, photosensitive area size
and number of element.
Easy-to-use infrared detector modules with preamp available
Applications
Radiation thermometer
Gas analyzer
Infrared spectrophotometers
FTIR
CO
2
laser monitor
Options (sold separately)
Heatsink for one-stage/two-stage TE-cooler A3179-01
(Heatsink for P3981-01 is a custom product.)
Heatsink for three-stage TE-cooler
Temperature controller
A3179-04
C1103-05 (-25 to -75 °C)
C1103-07 (20 to -30 °C)
Preamp
C5185-03 (P3981/P2750 series)
(Preamp for P3257-30/-101 is a custom product)
Infrared detector modules with preamp
C12495-111L (P3257-101)
Structure / Absolute maximum ratings
Dimensional
outline/
Window
material*
1
(1)/Se
(2)/Ge
(2)/S
(3)/S
(2)/S
(4)/S
Absolute maximum ratings
Photosensitive
Thermistor TE-cooler TE-cooler
Operating
Storage
Incident
Allowable
area
power allowable allowable
temperature temperature
Package
Cooling
light level
current
dissipation current voltage
Topr
Tstg
(mm)
(mW)
(A)
(V)
(mA)
(°C)
(°C)
with BNC connector Non-cooled
-
-
50
-40 to +60*
3
-
*
2
One-stage
TO-8
1.5
50
0.9
TE-cooled
1×1
TO-8
3
-40 to +60
Two-stage
-55 to +60
TO-66
3
0.2
TE-cooled
1.3
TO-8
6
1.0
-
6
Three-stage
TO-3
-40 to +60
TE-cooled 0.25 × 0.25
3
2.5
Type no.
P3257-30
P3257-101
P3981
P3981-01
P2750-08
P2750
P2750-06
Note:Exceeding the absolute maximum ratings even momentarily may cause a drop in product quality. Always be sure to use the
product within the absolute maximum ratings.
*1:
S=Sapphire glass, Se=ZnSe
*2:
CW: 50 W/cm
2
, pulse: 50 kW/cm
2
(Pulse width is 1
μs
or less and average power is 50 J/cm
2
or less.)
*3:
No condensation
www.hamamatsu.com
1
MCT photoconductive detectors
P3257/P3981/P2750 series
Electrical and optical characteristics (Typ. unless otherwise noted)
Measurement
Peak
Photo-
condition
Cutoff
sensitivity
sensitivity*
4
wavelength
Element
S
wavelength
λ
c
Type no. temperature
λp
λ=λp*
5
Td
(°C)
25
0
-30
-60
(μm)
6.5
7.0
3.6
4.8
4.8
(μm)
10.0
10.6
4.3
5.4
5.5
Detectivity
Detectivity
D*
D*
(500, 1200, 1)*
6
(λp, 1200, 1)*
5
Noise equivalent
power
NEP
λ=λp*
5
Rise time
Dark
Thermistor
tr
resistance resistance
0 to 63%
Rd
25 °C
P3257-30
P3257-101
P3981
P3981-01
P2750-08
P2750
P2750-06
Max.
Min.
Typ.
Typ.
(V/W) (cm · Hz
1/2
/W) (cm · Hz
1/2
/W) (cm · Hz
1/2
/W) (W · Hz
1/2
) (W · Hz
1/2
)
2 × 10
-3
5.0 × 10
5
3.0 × 10
6
2.0 × 10
5
5.0 × 10
-7
3.0 × 10
-6
5 × 10
-3
1.0 × 10
6
6.0 × 10
6
5.0 × 10
5
2.0 × 10
-7
1.2 × 10
-6
1 × 10
4
5.0 × 10
8
5.0 × 10
9
1.3 × 10
11
7.7 × 10
-13
7.7 × 10
-12
3 × 10
2
3.0 × 10
8
3.0 × 10
9
1.5 × 10
10
6.7 × 10
-12
6.7 × 10
-11
2 × 10
3
2.2 × 10
-12
2.0 × 10
-11
1.0 × 10
9
9.0 × 10
9
4.5 × 10
10
5.0 × 10
-13
5.0 × 10
-13
3 × 10
3
(μs)
1 (ns)
1 (ns)
10
2
3
(Ω)
30
35
600
160
200
(kΩ)
-
1.3
*4:
Photosensitivity changes with the bias current. The values in the above table are measured with the optimum bias current.
*5:
P3257-30/-101:
λ=10.6
μm
*6:
P3257-30/-101: (800, 600, 1)
Spectral response
P3257-30/-101
(Typ.)
12
P3981/-01
(Typ.)
10
8
10
D* (λ, 1200, 1) (cm · Hz
1/2
/W)
D* (λ, 600, 1) (cm ∙ Hz
1/2
/W)
P3257-101 (Td=0 ˚C)
Td=-30 ˚C
10
11
10
7
10
6
P3257-30 (Td=25 ˚C)
10
10
Td=0 ˚C
10
5
10
1
2
3
4
5
6
7
8
9
10
11
12
9
1
2
3
4
5
Wavelength (μm)
KIRDB0164EG
Wavelength (μm)
KIRDB0066EF
2
MCT photoconductive detectors
P3257/P3981/P2750 series
S/N vs. bias current (P2750)
12
D*
10
(Typ.)
Cooling characteristics of TE-cooler
[Typ. Ta=25 °C, thermal resistance of heatsink=3 °C/W (one and two-stage TE-cooled),
1.2 °C/W (three-stage TE-cooled)]
40
20
Relative value
8
S
Element temperature (°C)
One-stage
TE-cooled type
Two-stage
TE-cooled type (TO-8)
0
6
-20
4
N
-40
Two-stage
TE-cooled type (TO-66)
2
-60
0
0
1
2
3
4
5
6
7
-80
0
Three-stage
TE-cooled type
0.4
0.8
1.2
1.6
Bias current (mA)
KIRDB0070ED
Current (A)
KIRDB0175EA
The detector must be operated in a range where
the D* becomes max.
Current vs. voltage of TE-cooler
[Typ. Ta=25 °C, thermal resistance of heatsink=3 °C/W (one and two-stage TE-cooler),
1.2 °C/W (three-stage TE-cooler)]
Thermistor temperature characteristics
1 M
Ω
(Typ.)
1.6
1.4
1.2
One-stage
TE-cooled type
Current (A)
1.0
0.8
0.6
0.4
0.2
0
Two-stage
TE-cooled type
Three-stage
TE-cooled type
Sensor resistance
100 k
Ω
10 k
Ω
1 kΩ
-80
0
0.5
1.0
1.5
2.0
2.5
-60
-40
-20
0
20
40
Voltage (V)
KIRDB0176EC
Element temperature (°C)
KIRDB0071EB
4
MCT photoconductive detectors
P3257/P3981/P2750 series
Measurement circuit
Chopper
1200 Hz
Band-pass
filter
RMS
meter
Detector
Black body
500 K
fo=1200 Hz
Δf=120
Hz
Incident energy=2.64 μW/cm
2
KIRDC0005EB
Connection example (P3981)
Cable (supplied with C5185)
BNC connector
cable (sold separately)
P3981
+
A3179-01
Detector &
Heatsink
Power supply for amp
C5185-03
Amp
Lock-in amp or
spectrum analyzer
Signal
processing
circuit
C1103-05
Temperature
controller
C4696
Chopper
BNC connector
cable (sold separately)
Cable (supplied with C1103-05)
Connect C1103-05 and power supply ground wires together.
KIRDC0006EC
Dimensional outlines (unit: mm)
(1) P3257-30
54.0 ± 0.4
20 ± 0.2
5 ± 0.2
41.2 ± 0.2
9.0 ± 0.2
1.3 ± 0.2
11.7 ± 0.2
(2) P3257-101, P3981, P2750-08
15.3 ± 0.2
14 ± 0.2
10 ± 0.2
A
KIRDA0121EB
Window
10 ± 0.2
20 ± 0.2
BNC connector
0.45
Lead
10.2 ± 0.2
12 min.
Detector
Detector
TE-cooler (-)
TE-cooler (+)
Thermistor
P3257-101 P3981, P2750-08
A 5.2 ± 0.2
Photosensitive
surface
5.0 ± 0.2
Photosensitive
surface
5.1 ± 0.2
5.1 ± 0.2
6.6 ± 0.2
KIRDA0122EB
5
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