Page 1
Model No. LY251
Letex Technology Corp.
State Voltage V
1500Vrms Input/Output isolation
Tape & Reel version available
Temperature Controls
Solenoid/ Valve Controls
Photocoupler
Features
‧
SOP package 4 Pin type in miniature design (4.4×4.3×2.0mm / .173×.169×.083 inch)
‧
High Repetitive Peak Off-
DRM=600V min.
‧
‧
Applications
‧
AC Motor Drivers
‧
AC Motor Starters
‧
E.M. Contactors
‧
Lighting Controls
‧
‧
Solid State Relays
‧
Static Power Switches
‧
Page 2
Model No. LY251
Letex Technology Corp.
(Ambient Temperature
LED Reverse Voltage
State Output Terminal Voltage
Total Power Dissipation
I/O Breakdown Voltage
Viso
Operating Temperature
Topr
Storage T emperature
Tstg
Pin Soldering Temperature
Tsol
(Ambient Temperature: 25
Voltage
Peak Blocking Current, Either
State Voltage, Either Direction
State V oltage
LED Trigger Current, Current Required
Main Terminal
Voltage= 3V
Ton
Inhibit Voltage
MT2 Voltage
above which device
Rated
Absolute Maximum Ratings
Item Symbol Value Units Note
Photocoupler Specifications
Part Name: LY251
: 25℃)
Continuous LED Current
Peak LED Current
Input
Input Power Dissipation
Off-
Peak Repetitive Surge Current
Output
Peak Load Current
Output Power Dissipation
Electrical Specifications
IF 50
IFP 1000
VR 6
PD 120
mW
VDRM 600
ITSM 1
IPeak 0.6
Pout 150
PT 250
1500
mW
mW
Vrm RH=60%, 1min
-40 to +100
-50 to +120
260
℃)
Item Symbol MIN. TYP. MAX.
mA
mA f=100Hz, duty=1%
V
V
A PW=100us, 120pps
A 100ms(1 pulse)
℃
℃
℃
10 sec max.
Unit
Conditions
s
LED Forward
Input
Reverse Current
Direction
Output
Coupled
Zero
Peak On-
Circuit rate of Rise of Off-
to Latch Output, Either Direction
Holding Current, Either Direction
Turn-On Time
Crossing
VF
IR
IDRM1
VTM
dv/dt
IFT
IH
VINH
1.2 1.4
0.05 10
600 1500
17 15
400
8 20
5 20
500
3.0
V IF=10mA
µA VR=6V
VDRM=600V
nA
V ITM=100mA Peak
V/µs
mA
µA
Vp=9V,IF=20mA,
µs
RL=100Ω
IF=Rated IFT,
MT1-
ms
will not trigger.
Leakage in Inhibited State
IDRM2
500
µA
IF=Rated IFT,
VDRM, Off State
Page 3
Model No. LY251
Letex Technology Corp.
Outline Dimensions
34
1 2
Unit : mm inch
Tolerance: 0.1 .004
Schematic
4
1
1. LED Anode
2. LED Cathode
3. Main Terminal
4. Main Terminal
3
ZERO
CROSSING
CIRCUIT
2
Page 4
Model No. LY251
Letex Technology Corp.
Ambient temperature (
Ambient temperature (
Ambient temperature (
Reference Data
Forward current Vs.
Ambient temperature
60
50
40
30
20
Forward current (mA)
10
0
-30
0 25 100 125 0 25 125
75 50 -25
Ambient temperature (℃)
Forward current Vs.
Forward voltage
500
200
100
50
20
10
Forward current (mA)
5
2
1
0
Ta = 75℃
50℃
25℃
0℃
25℃
3.0 2.5 1.0 0.5 1.5 2.0
Forward voltage (V)
On-state current Vs.
Ambient temperature
0.10
0.07
0.05
On-state current (A)
0
Ambient temperature (℃)
On-state voltage Vs.
Ambient temperature
3.0
2.6
2.2
1.8
1.4
On-state voltage (V)
1.0
Ambient temperature (℃)
75 50 100
ITM =100mA
Minimum trigger current Vs.
Ambient temperature
10
8
6
4
2
MInimum trigger current (mA)
0
40
20
Holding current Vs.
Ambient temperature
1.0
0.1
VP = 6V
RL = 100Ω
60 80 100
℃
)
VP =6V
Forward current (mA)
100 20 40 60 80
0.01
20 40 80 60 100
℃
)
Turn-on time Vs.
Forward current
10
8
)
μs
6
4
Turn-on time (
2
0
10
20
30 40
Forward current (mA)
static dv/dt test circuit
+400
Vdc
R
TEST
TEST
PLUSE
INPUT
APPLIED VOLTAGE
WAVEFORM
C
MERCURY
WETTED
RELAY
252 V
0 VOLTS
RC
VP = 6V
RL = 100Ω
D.U.T
Vmax = 400V
On-state current Vs.
On-state voltage
100
80
60
40
On-state current (mA)
20
50
0
0
0.5 3.0
1.0 1.5 2.0 2.5 40 60 80
On-state voltage (V)
R=10k
x100
SCOPE
PROBE
0.63 Vmax
378
dv/dt =
=
RC
RC
Repetitive peak off-state current Vs.
Ambient temperature
1000
100
10
Repetitive peak off-state current (nA)
1
100 20
℃
)
Page 5
Model No. LY251
Letex Technology Corp.
Brand Name
Part Name
Date Code
1. There shall be leader of 230 mm minimum w hich may consist of carrier and or cover tape follower by a
Taping Specifications for Surface Mount Devices
Label sticking position
Direction of feed
Unit : mm
Recommended Mounting Pad
(Unit: mm / Tolerance: ±0.1)
(Each photo MOS relay shall be marked with the
following information)
Marking
LETEX
LY251
321
3 2 1
Note:
minimum of 160 mm of carrier tape sealed with cover tape.
Weeks
Monthly
Year
2. There shall be a minimum of 160 mm of empty component pockets sealed with cover tape.
3. Devices are pockets in accordance with EIA standard EIA-481-A and specifications given above.
4. Packaging: 2,000pcs per reel, 2 reel per box, 5 boxes per carton.
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