Industrial Automation Isolation Solution

Application

Description

Optocoupler-based isolation solution for industrial control and automation systems

Core Advantages

Proven reliability in industrial applications

Multiple isolation levels to match safety requirements

High CMR (Common Mode Rejection) for noise immunity

Long-term supply stability from Lite-On

Local technical support for design optimization

Recommended Bill of Materials (BOM)

Item	Part Number	Description	Quantity	Datasheet
1	LTV-817	Standard Phototransistor Optocoupler	5	📄 Download
2	LTV-356T	High-speed Logic Gate Optocoupler	3	📄 Download
3	Resistor 1k	Current limiting resistor	10	📄 Download
4	Capacitor 100nF	Decoupling capacitor	5	📄 Download

Technical Specifications

Isolation Voltage

3750Vrms minimum

C T R Range

50-600% depending on type

Response Time

4-18μs typical

Operating Temperature

-40°C to +110°C

Creepage Distance

7mm minimum

Clearance

7mm minimum

Safety Standards

UL, VDE, CQC certified

Customer Success Stories

Industrial Control Manufacturer

Challenge

Needed reliable isolation for PLC I/O modules in harsh factory environment

Solution

Implemented Lite-On LTV series optocouplers with proper layout

Results

FAE Expert Insights

FAE Expert

Field Application Engineer

Professional Insights

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

Frequently Asked Questions

What isolation voltage do I need?

Isolation voltage requirements depend on application: Basic insulation typically requires 2500Vrms, reinforced insulation requires 5000Vrms. Industrial control often requires 3750-5000Vrms. Check relevant safety standards (IEC 61010, UL 508) for your specific application.

Determine required insulation level from safety standards. Select optocoupler with appropriate isolation rating.

How do I select the right CTR?

CTR (Current Transfer Ratio) selection depends on drive capability and load requirements. Higher CTR reduces LED drive current but may have wider variation. Standard CTR (100-200%) suits most applications. Wide CTR (50-600%) offers flexibility but less precision.

Use standard CTR for typical applications. select tight CTR bins for precision requirements. design for worst-case CTR.

What is the difference between phototransistor and logic gate optocouplers?

Phototransistor optocouplers (LTV-8xx) are economical with moderate speed (2-10μs). Logic gate optocouplers (LTV-3xxT) offer faster switching (0.5-4μs) and better noise immunity. Phototransistor types suit slow signals and power isolation. Logic gate types are preferred for digital communication.

Use phototransistor for slow signals and cost-sensitive designs. Use logic gate for high-speed digital and noise-critical applications.

How do I ensure long-term reliability?

Long-term reliability requires: Proper LED drive current (derate for high temperature), adequate safety margins on isolation voltage, proper PCB layout for creepage/clearance, and environmental protection. Lite-On optocouplers are qualified to industrial reliability standards.

Follow datasheet recommendations. implement proper derating. contact FAE for reliability assessment.

What PCB layout considerations are important?

Critical layout considerations: Maintain rated creepage and clearance distances, keep input and output traces separated, use appropriate slotting for high isolation, place decoupling capacitors close to pins, avoid vias in isolation barrier region.

Follow layout guidelines in datasheet. use design rule checks for clearance verification. submit layout for FAE review.

What is the lead time and pricing?

Standard lead time is 6-8 weeks for most optocouplers. beiLuo maintains stock for popular types. Pricing ranges from $0.15 to $0.50 depending on type and volume. volume discounts available at 5K, 10K, and 50K+ quantities.

Check BeiLuo stock for immediate needs. plan 8-12 weeks for production volumes. contact sales for volume pricing.