S8543 is a one-dimensional PSD with a long, narrow active area sealed in a surface mountable chip carrier package. The active area of

0.7 × 24 mm delivers excellent position detection characteristics.

Hamamatsu also provides L5586 infrared LED compatible with S8543.

Features

l Long, narrow active area: 0.7 × 24 mm

l Chip carrier package for surface mount (t=1.36 mm)

l Excellent position detection characteristic and resolution

Applications

l Position detection of optical pickup head

l Distance measurement

l Displacement measurement

l Position detection, etc.

PSD

One-dimensional PSD

Long, narrow active area and surface mountable package

S8543

s Absolute maximum ratings (Ta=25

°C)

Parameter

Symbol

Value

Unit

Reverse voltage

V

Operating temperature

Topr

-10 to +75

°C

Storage temperature

Tstg

-20 to +80

°C

s Electrical and optical characteristics (Ta=25

°C)

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Spectral response range

λ

-

320 to 1100

-

nm

Peak sensitivity wavelength

λp

-

960

-

nm

Photo sensitivity

S

λ=λp

-0.58

-

A/W

Dark current

-

1

15

nA

Rise time

tr

λ=780 nm, 10 to 90 %

-20

50

µs

Terminal capacitance

Ct

-

65

130

pF

Interelectrode resistance

Rie

Vb=0.1 V

100

140

180

k

Ω

Position detection error

E

-

±50

±250

µm

Position resolution

∆R

Io=1 µA, B=1 kHz *

2

-0.6

-

µm

Saturation photocurrent *

3

Ist

200

-

-

µA

*1: Within ±75 % from center to end of active area

*2: 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). The resolution value listed in this data sheet was calculated under the following

conditions.

• Frequency bandwidth: 1 kHz

• Photocurrent: 1 µA

• Equivalent input noise voltage of circuit: 1 µV (1 kHz)

• Interelectrode resistance: Typical value (refer to the specification table)

*3: This is the upper limit of photocurrent linearity. The upper limit is defined as a point where the photocurrent output deviates

10 % from the linearity.

1