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Photo IC for optical link
L12557-01SR, S12423-01SR
Transmitter/receiver photo IC for DC to 10
Mbps optical link
The L12557-01SR transmitter photo IC combines a 650 nm red LED, which is suitable for plastic optical ber (POF) communi-
cation, and a driver IC. It has a mini molded lens suitable for coupling to the POF. It supports communication speeds ranging
from DC to 10 Mbps. The S12423-01SR receiver photo IC has monolithically integrated PIN photodiode and signal processing
circuit. It features small size and strong resistance to electromagnetic induction noise. The S12423-01SR generates digital
output (CMOS).
Features
Applications
L12557-01SR
Transmitter photo IC
Peak emission wavelength: 650 nm
Supports DC to 10 Mbps communication
S12423-01SR
Receiver photo IC
Supports DC to 10 Mbps communication
Monolithic photo IC featuring strong resistance to
electromagnetic induction noise
Digital output (CMOS)
Data transmission in harsh, noisy environments, such
as in FA and OA
High-speed, short-distance data transmission
Highly bursty data transmission
Absolute maximum ratings
Parameter
Symbol
Condition
Value
Unit
Supply voltage
L12557-01SR
S12423-01SR
Vcc
-0.5 to +7.0
-0.5 to +4.0
V
Input voltage
Output voltage
L12557-01SR
S12423-01SR
Vin
Vo
-0.5 to Vcc+0.5
-0.5 to Vcc+0.5
V
V
Power dissipation*1
Operating temperature
Storage temperature
Soldering conditions
Pmax
Topr
Tstg
Tsol
250
No dew condensation*2
-20 to +85
No dew condensation*2
-40 to +85
230 °C, within 5 s, at least 2 mm away from lead roots
mW
°C
°C
-
*1: Power dissipation decreases at a rate of 1.75 mW/°C above Ta=25 °C.
*2: When there is a temperature difference between a product and the surrounding area in high humidity environment, dew condensation
may occur on the product surface. Dew condensation on the product may cause deterioration in characteristics and reliability.
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.
Recommended operating conditions
Parameter
Supply voltage
L12557-01SR
S12423-01SR
High level input voltage
Low level input voltage
L12557-01SR
High level
Low level
output
output
current
current
S12423-01SR
Symbol
Vcc
Vih
Vil
Ioh
Iol
Min.
4.75
3.135
2
-0.3
-4
0
Typ.
5.0
3.3
-
-
-
-
www.hamamatsu.com
Max.
5.25
3.465
Vcc + 0.3
0.8
0
4
Unit
V
V
mA
1

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Photo IC for optical link
L12557-01SR, S12423-01SR
L12557-01SR
Electrical and optical characteristics (Ta=25 °C, Vcc=4.75 to 5.25 V, unless otherwise noted)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Current consumption
Icc Vin=2.0 V
- - 40 mA
Data transmission rate
fD
Biphase signal
(NRZ conversion)
DC
-
10 Mbps
Peak emission wavelength
λp
630 650 670 nm
Temperature coefcient of
peak emission wavelength
Tcλ
- 0.13 - nm/°C
Spectral half width (FWHM)
∆λ
- 20 30 nm
Fiber coupling optical output
Rise time
Po Peak value*3
tr 20 to 80%*3 *4 *5
-10.0
-
-
-
-1.0 dBm
20 ns
Fall time
tf 80 to 20 %*3 *4 *5
-
- 20 ns
Pulse width distortion
Tw 50%*3 *4 *5
-15 - +15 ns
Jitter
tj *3 *4 *5
- - 20 ps
*3: For the ber, use Mitsubishi Rayon GH4001 (ϕ1 mm, SI-POF, NA=0.5, 1 m).
*4: For the input signal, a 10 Mbps pseudo-random biphase signal is assumed.
*5: Dened using the average at 50% duty ratio
S12423-01SR
Electrical and optical characteristics (Ta=25 °C, Vcc=3.135 to 3.465 V, unless otherwise noted)
Parameter
Symbol
Condition
Min.
Typ.
Data rate
fD
Biphase signal
(NRZ conversion)
DC
-
Current consumption
Icc No optical input
-
-
Maximum receiver level
Pi max Peak value*6 2 -
Minimum receiver level
Pi min Peak value, Pe=10-7*6
-
-
High level output voltage Voh Ioh=-150 μA
2.7
-
Output voltage
Low level output voltage Vol Iol=1.6 mA
Rise time
tr 20% to 80%*4 *7
-
-
-
-
Fall time
tf 20% to 80%*4 *7
-
-
Pulse width distortion
t *4 *6 *7
-25 -
Jitter
tj *4 *6 *7
--
*6: A signal generated by a Hamamatsu’s standard signal generator is assumed for the optical input signal.
*7: CL=5 pF (including parasitic capacitance of probe, connector, and printed circuit board)
Max.
10
40
-
-20
-
0.4
20
20
+25
20
Unit
Mbps
mA
dBm
dBm
V
V
ns
ns
ns
ns
Input light
waveform
T1
tr tf
Output
waveform
T2
50%
TPLH
Input light
waveform
80%
50%
20%
∆T=T2 - T
Output
waveform
∆tjr
TPHL
50%
50%
∆tjf
Parameter Symbol
Measurement method
Set the trigger to the PPG CLK,
Rising edge jitter ∆tjr and measure the jitter in the
rising edge of the output.
Set the trigger to PPG CLK,
Falling edge jitter ∆tjf and measure the jitter in the
falling edge of the output.
Jitter
∆tj
Set Δtj to the larger of the two
jitter values: Δtjr and Δtjf.
KPICC0250EA
Note [L12557-01SR, S12423-01SR]:
· Connect a 0.1 μF bypass capacitor within 3 mm of this element’s lead (between Vcc and GND). In addition, connect a 4.7 μF capacitor.
· Align the center axes of the ber and package lens, and make the gap between the ber and the optical reference plane of the lens
surface 0.1 mm.
2

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Photo IC for optical link
L12557-01SR, S12423-01SR
Dimensional outline (unit: mm)
5.2 ± 0.3
(Including burr)
5.0
(4×) 0.5
(4×) 0.4
1.27 1.27 1.27
(Specified at lead root)
(0.9)
10°
(0.9)
1.77
0.97
0.69
Pin no. L12557-01SR S12423-01SR
Vin Vout
GND
GND
A
GND
Vcc
Vcc Vcc
Tolerance unless otherwise noted: ±0.1, ±2°
Shaded area indicates burr.
Values in parentheses indicate reference values.
Standard packing type
Plastic tray (100 pcs/tray)
Material: PVC (conductive)
(4×) 0.25
0.25
10°
5.0
Related information
www.hamamatsu.com/sp/ssd/doc_en.html
Precautions
Disclaimer
Metal, ceramic, plastic package products
Enlarged view of A
KPICA0096EA
3