LT218

Rev.B

Letex Technology Corp.

Photo DMOS-FET Relay

Description

The LT218 is a miniature 1-Form A solid state relay in a 4 pin SOP package that employs

optically coupled MOSFET technology to provide 1500V of input to output isolation.

The optically coupled input is controlled by a highly efficient GaAlAs infrared LED and

MOS FETs on the output side.

Features

?SOP package 4 Pin type in miniature design (4.4×4.3×2.0mm / .173×.169×.083inch)

?Low driver power requirements (TTL/CMOS Compatible)

?No moving parts

?Hi-A : Load Current = 2.5A

?High reliability

?Arc-Free with no snubbing circuits

?1500Vrms Input/Output isolation

?Tape & Reel version available

Applications

?Telecommunications (PC, Electronic notepad)

?Measuring and Testing equipment

?Industrial control

?Security equipments

?High speed inspection machine

Outline Dimensions

3

Unit : mm inch

Tolerance: 0.1 .004

1

4

2

1

2

4 3

1. LED Anode

2. LED Cathode

3, 4. Drain (MOS FET) LT218

Rev.B

Letex Technology Corp.

Photo DMOS-FET Relay Specifications

Part Name: LT218

(Load voltage:40V / Load current: 2.5A)

Absolute Maximum Ratings (Ambient Temperature: 25℃)

Item Symbol

Value Units Note

Input

Continuous LED Current IF 50 mA

Peak LED Current IFP 1000 mA

f=100Hz,

duty=1%

LED Reverse Voltage VR 5 V

Input Power Dissipation PIn 75 mW

Output

Load Voltage VL 40 V(AC peak or DC)

Load Current IL 2.5 A

Peak Load Current IPeak 5.0 A

100ms(1 pulse)

Output Power Dissipation Pout 400 mW

Total Power Dissipation PT 500 mW

I/O Breakdown Voltage VI/O 1500 Vrms RH=60%, 1min

Operating Temperature Topr -40 to +85

℃

Storage Temperature Tstg -40 to +100

℃

Pin Soldering Temperature Tsol 260

℃

10 sec max.

Electrical Specifications (Ambient Temperature: 25℃)

Item Symbol

MIN.

TYP. MAX. Units

Conditions

Input

LED Forward Voltage VF 1.2 1.4 V IF=10mA

Operation LED Current

IFon 0.5 2.0 mA

Recovery LED Current

IFoff 0.35 0.5 mA

Recovery LED Voltage VFoff 0.7 V

Output

On-Resistance Ron 0.06 0.1

?

IF=5mA,IL=100mA,

Time to flow is within

1 sec.

Off-State Leakage

Current

ILeak 1 uA VL=Rating

Output Capacitance Cout 100 pF VL=0, f=1MHz

Transmis

sion

Turn-On Time Ton 0.5 1.0 ms IF=5mA, IL=100mA,

Turn-Off Time Toff 0.02 0.5 ms

Coupled

I/O Isolation Resistance

RI/O

1010

?

DC500V

I/O Capacitance CI/O 0.8 1.5 pF f=1MHz LT218

Rev.B

Letex Technology Corp.

Reference Data

LED foward current Vs.

turn off time characteristics

Voltage Vs. currennt characteristics

of output at MOS portion

10

0.2

0

0

0.4

0.6

0.8

LED forward current (mA)

20 30 40 50

0.02

60

0

0 10

0.04

0.06

0.08

LED forward current (mA)

20 30 40 50

LED foward current Vs.

turn on time characteristics

50mA

30mA

20mA

10mA

5mA

1.0

1.2

-40

0

-20

Ambient temperature (℃)

40

0 20 60 85

LED forward voltage Vs.

Ambient temperature

1.0

1.1

1.2

1.3

1.5

1.4

0.10

0.12

100

-10

-5 -4

1

-2

-8

-6

-4

-3 -2

2

-1

4

Voltage, V

2 3 4 5

8

6

10

150

50

60

0

0 10

50

100

Applied voltage (V)

30

20 40

Applied voltage Vs.

output capacitance characteristics

40

200

0

10-12

8

Load voltage (V)

24

16 32

10 -9

10 -6

10 -3

-40

0

-20

0.01

0.02

0.03

Ambient temperature (℃)

40

0 20 60 85

0.04

-40

0

-20

Turn off time Vs.

Ambient temperature

Ambient temperature (℃)

40

0 20 60 80

85

100 -40

0

-20

1

2

3

Ambient temperature (℃)

40

0 20 60 85

LED operate current Vs.

Ambient temperature

4

5

100 -40

0

-20

Ambient temperature (℃)

40

0 20 60 85

Load current Vs.

Ambient temperature

0.5

1.0

1.5

2.0

2.5

3.0

On resistance Vs.

Ambient temperature

100

100

100 -40

0

-20

0.2

0.4

0.6

Ambient temperature (℃)

20

0 40 60 85

LED turn off current Vs.

Ambient temperature

0.8

1.0

100

0

-40 -20

Ambient temperature (℃)

20

0 40 60 80

85

Turn on time Vs.

Ambient temperature

1.0

0.5

1.5

2.0

2.5

3.0

0.05

0.10

0.15

0.20

Off state leakage current Vs.

Load voltage characteristics

Turn on time (ms)

Turn off time (ms)

LED forward voltage (V)

Current, A

Out capacitance (pF)

Off state leakage current (A)

Turn off time (ms)

LED operate current (mA)

Load current (A)

On resistabce (Ω)

LED turn off time (mA)

Turn on time (ms)LT218

Rev.B

Letex Technology Corp.

Taping Specifications for Surface Mount Devices

Direction of feed

Unit : mm

Label sticking position

Unit : mm

Tolerance : ±0.1

Recommended Mounting Pad

(Top view)

Marking

(Each photo MOS Relay shall be marked

with the following information)

Brand Name

Part Name

Date Code

LETEX

LT218

R963

R963

RoHS

Weeks

Monthly

Year

Note: 1. There shall be leader of 230 mm minimum which may consist of carrier and or cover tape

follower by a minimum of 160 mm of carrier tape sealed with cover tape.

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.