CNY74-4H Equivalent & Substitute Parts

Part Overview

The CNY74-4H is a 4-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. It provides 5300Vrms isolation voltage and is designed for applications requiring galvanic isolation between input and output circuits. The part is classified as Last Time Buy, indicating limited future availability. Identifying equivalent and substitute parts is essential for design continuity and long-term supply chain planning.

Substiute Parts

CNY74-4H

Vishay Semiconductor Opto DivisionIn Stock: 6375CNY74-4H Datasheet

Current PartRFQ

TCET4100

Vishay Semiconductor Opto DivisionIn Stock: 1215TCET4100 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CNY74-4H is determined by the following critical parameters:

• Number of Channels: Must be 4 channels
• Package Type: Must be 16-DIP (0.300", 7.62mm) for mechanical compatibility
• Isolation Voltage: Minimum 5000Vrms (CNY74-4H specifies 5300Vrms)
• Output Type: Must be transistor output
• Current Transfer Ratio Range: 50% minimum and 600% maximum @ 5mA
• Operating Temperature Range: -55°C ~ 100°C
• Mounting Type: Through Hole
• Compliance: ROHS3 Compliant

The TCET4100 meets all substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The TCET4100 is a direct substitute for the CNY74-4H based on the following factors:

• Both parts are manufactured by Vishay Semiconductor Opto Division, ensuring consistent design and quality standards
• Electrical parameters are functionally equivalent across all critical specifications
• The TCET4100 features a lower Vce saturation voltage (300mV vs 500mV), which represents an improvement in switching performance
• Both parts maintain identical isolation voltage performance within acceptable design margins (5000Vrms vs 5300Vrms)
• Package, mounting type, and compliance certifications are identical
• Both parts carry Last Time Buy status, requiring proactive component planning

The TCET4100 is suitable for direct replacement in existing CNY74-4H designs without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can TCET4100 replace CNY74-4H in existing designs? A: Yes. The TCET4100 meets all electrical and mechanical compatibility requirements. The identical 16-DIP package and through-hole mounting allow direct PCB substitution without layout changes.

Q: What is the difference in isolation voltage between these parts? A: The CNY74-4H provides 5300Vrms isolation while the TCET4100 provides 5000Vrms. Both exceed typical industrial isolation requirements. Applications requiring the full 5300Vrms specification should retain the CNY74-4H.

Q: Are the switching characteristics identical? A: Yes. Turn-on/turn-off times and rise/fall times are identical. The TCET4100 offers superior saturation voltage performance (300mV vs 500mV), which may improve switching efficiency.

Q: Do both parts require the same PCB footprint? A: Yes. Both use 16-DIP (0.300", 7.62mm) through-hole packages with identical pin configurations and spacing.

Q: Are there compliance or certification differences? A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Why is the CNY74-4H marked as Last Time Buy? A: Last Time Buy status indicates the manufacturer is discontinuing this part number. The TCET4100 provides a viable alternative for future designs and ongoing production requirements.