S3979, S3931, S3932, S3270
Hamamatsu provides various types of one-dimensional PSD (Position Sensitive Detector) designed for precision distance measurement such as
displacement meters. S3979 has a 1 × 3 mm active area sealed in a TO-5 package.
S3931 and S3932 have an active area of 1 × 6 mm and 1 × 12 mm respectively, and are mounted on a compact ceramic package with a
transparent resin window. Variant types (S3931-01, S3932-01) with a visible-cut resin window are also available.
S3270 offers an active area longer than 30 mm, allowing position detection at a long distance. S3270 has a visible-cut resin window, and S3270-
01 with a transparent resin window is also available.
Features
l
Superior position detection ability
l
High reliability
l
S3931, S3932: Easy to use 4-pin small ceramic package
l
Long and narrow active area
S3270: 1 × 37 mm
Applications
l
Displacement sensing
l
Distance measurement
l
Proximity switching
PSD
One-dimensional PSD
3 to 37 mm resistance length PSD for precision distance measurement
1
■ General ratings / Absolute maximum ratings
Absolute maximum ratings
Active area
size Reverse voltage
VR Max.
Operating temperature
Topr
Storage temperature
Tstg
Type No. Package Window
material *1
(mm) (V) (°C) (°C)
S3979 TO-5 K 1 × 3
S3931 R 1 × 6
S3932 R 1 × 12
-10 to +60
S3270 *2
Ceramic
R (B) 1 × 37
20
-10 to +75
-20 to +80
■ Electrical and optical characteristics (Typ. Ta=25 °C, unless otherwise noted)
Spectral
response
range
λ
Peak
sensitivity
wavelength
λp
Photo
sensitivity
S
λ=λp
Interelectrode
resistance
Rie
Vb=0.1 V
Position
detection error *3
E
VR=5 V
light spot φ200 µm
Saturation
photocurrent *4
VR=5 V
RL=1 kΩ
Dark
current
ID
VR=5 V
Temp.
coefficient
of
ID
TCID
Rise time
tr
VR=5 V
RL=1 kΩ
Terminal
capacitance
Ct
VR=5 V
f=10 kHz
Position
resolution
*5 Type No.
(nm)
(nm)
(A/W)
Min.
(kΩ)
Typ.
(kΩ)
Max.
(kΩ)
Typ.
(µm)
Max.
(µm)
(µA)
Typ.
(nA)
Max.
(nA)
(times/°C)
(µs)
(pF)
(µm)
S3979 100 140 180 ±15 ±60 40 0.1 5 2.5 20 0.1
S3931 ±30 ±120 0.15 10 1.5 40 0.2
S3932
320 to 1100 920 0.55
30 50 80 ±60 ±240 100 0.2 20 3.0 80 0.3
S3270 700 to 1100 960 0.55 10 15 20 ±100 ±400 300 0.5 20
1.15
1.0 100 2.8
*1: K: borosilicate glass, R: clear resin coating, R (B): visible-cut resin coating.
*2: Works with microscopic spot light detection.
*3: A range of 75 % of that from the center of the photosensitive surface to the edge.
*4: The upper limit of linearity of photocurrent in response to the quantity of light is defined as the point where the linearity
deviates by 10 %.
*5: Position resolution
This is the minimum detectable light spot displacement. The detection limit is indicated by the distance on the photosensitive
surface. The numerical value of the resolution of a position sensor using a PSD is proportional to both the length of the PSD
and the noise of the measuring system (resolution deteriorates) and inversely proportional to the photocurrent (incident
energy) of the PSD (resolution improves).
Light source: LED (900 nm) Photocurrent: 1 µA
Spot light size: φ 200 µm Circuit system input noise: 1 µV (1 kHz)
Frequency range: 1 kHz Interelectrode resistance: Typical value (refer to the specification table)
One-dimensional PSD
S3979, S3931, S3932, S3270
■ Spectral response
300
-0.5
0
+1.0
+2.0
+1.5
+0.5
400 500 600 700
WAVELENGTH (nm)
TEMPERATURE COEFFICIENT (%/˚C)
800 900 1000 1100
(Typ.)
S3979, S3931, S3932
S3270
0
0.2
0.4
0.8
0.6
(Typ. Ta=25 ˚C)
400 600
WAVELENGTH (nm)
PHOTO SENSITIVITY (A/W)
800 1000
S3979
S3931
S3932
QE=100 %
QE=50 % S3270
KPSDB0069EB
■ Photo sensitivity temperature characteristics
KPSDB0070EB
1
0.1
1 pA
10 pA
100 pA
1 nA
10 nA
10
100
REVERSE VOLTAGE (V)
DARK CURRENT
(Typ. Ta=25 ˚C)
S3270
S3979 S3931
S3932
0.1 1
1 pF
10 pF
100 pF
1 nF
10 nF
10 100
REVERSE VOLTAGE (V)
TERMINAL CAPACITANCE
S3979
S3931
S3932
S3270
(Typ . Ta=25 ˚C, f=10 kHz)
■ Dark current vs. reverse voltage
KPSDB0071EB
■ Terminal capacitance vs. reverse voltage
KPSDB0072EB
2
One-dimensional PSD
S3979, S3931, S3932, S3270
-6 -4 -2-5 -3 -1 0
-150
-100
-50
0
+50
+100
+150
+6+4+2 +5+3+1
POSITION ON PSD (mm)
POSITION DETECTION ERROR (
m
m)
KPSDB0012EB
0
POSITION ON PSD
+20
+100
-100
POSITION DETECTION
ERROR (µm)
-20 -10-15 -5 +5 +10 +15
KPSDC0010EA
L
X1X2
ACTIVE AREA
x
■ Conversion formula of spot light position on the PSD
If output signals (photocurrent) I1 and I2 are obtained
from electrodes X1 and X2, then the light spot position
(x) on the PSD can be found by the following formula.
I2 - I1 2x
I1 + I2 L
=
-1.5 -1.0 -0.5 0
-150
-100
-50
0
+50
+100
+150
+1.5+1.0+0.5
POSITION ON PSD (mm)
POSITION DETECTION ERROR (
m
m)
KPSDB0010EB
-3 -2 -1 0
-150
-100
-50
0
+50
+100
+150
+3+2+1
POSITION ON PSD (mm)
POSITION DETECTION ERROR (
m
m)
KPSDB0011EB
KPSDC0068EA
■ Example of position detectability (Ta=25 °C, λ=900 nm, spot light size: φ0.2 mm)
■ Correction for position detection error
Position detection characteristics obtained by the above
formula can be corrected to reduce position detection
errors. For example, the maximum position detection
error (±120 µm) of S3931 can be significantly reduced
to ±9 µm by using the least square method.
S3979 S3931
S3270
S3932
3
HAMAMATSU PHOTONICS K.K., Solid State Division
1126-1 Ichino-cho, Higashi-ku, Hamamatsu City, 435-8558 Japan, Telephone: (81) 53-434-3311, Fax: (81) 53-434-5184, www.hamamatsu.com
U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P.O.Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1) 908-231-0960, Fax: (1) 908-231-1218
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49) 08152-3750, Fax: (49) 08152-2658
France: Hamamatsu Photonics France S.A.R.L.: 19, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: 33-(1) 69 53 71 00, Fax: 33-(1) 69 53 71 10
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: (44) 1707-294888, Fax: (44) 1707-325777
North Europe: Hamamatsu Photonics Norden AB: Smidesvägen 12, SE-171 41 Solna, Sweden, Telephone: (46) 8-509-031-00, Fax: (46) 8-509-031-01
Italy: Hamamatsu Photonics Italia S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39) 02-935-81-733, Fax: (39) 02-935-81-741
Information furnished by HAMAMATSU is believed to be reliab le. Ho w ever, no responsibility is assumed for possible inaccuracies or omissions .
Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2007 Hamamatsu Photonics K.K.
One-dimensional PSD
S3979, S3931, S3932, S3270
Cat. No. KPSD1002E04
Nov. 2007 DN
■ Dimensional outlines (unit: mm)
ACTIVE AREA
9.2
±
0.2
5.08
±
0.2
2.7
13.7 4.1
±
0.2
8.1 ± 0.1
WINDOW
5.9
±
0.1
PHOTOSENSITIVE
SURFACE
0.45
LEAD
ANODE
(X2)
ANODE
(X1)
CATHODE
(COMMON)
CONNECTED TO CASE
X
KPSDA0007EC
ACTIVE AREA
5.5 ± 0.25
3.0
2.2 42.3 ± 0.4
55 ± 0.5
1.0
1.0
1.4
2.5 ± 0.28.5 ± 1.5
PHOTOSENSITIVE
SURFACE
0.45 ± 0.05
LEAD
3.75 ± 0.25 40.3 ± 0.4
ANODE (X1)
CATHODE
(COMMON)
ANODE (X2)
5.0 ± 0.2
4.0 (2 ×) R2.2
(2 ×) R1.1
X
1.7
KPSDA0050EA
KPSDA0048EA
9.2 ± 0.2
5.08 ± 0.3
(4 ×) 0.4
4.0
4.8
±
0.2
ACTIVE
AREA
0.7
5.08
±
0.3
(4 ×)0.25
PHOTOSENSITIVE
SURFACE
1.5
±
0.2
CATHODE
(COMMON)
ANODE
(X2)
CATHODE
(COMMON)
ANODE
(X1)
X
KPSDA0049EA
4.0
(4 ×) 0.4
10.16
±
0.4
5.08 ± 0.3
ACTIVE AREA
PHOTOSENSITIVE
SURFACE
0.7
CATHODE
(COMMON)
ANODE
(X2)
CATHODE
(COMMON)
ANODE
(X1)
(4 ×)0.25
4.8 ± 0.2
1.5 ± 0.2
15.2 ± 0.2
X
S3979 S3931
S3932 S3270
4
