ILQ74 Equivalent & Substitute Parts

Part Overview

The ILQ74 is a 4-channel optoisolator with transistor output, rated for 5300Vrms isolation voltage in a 16-DIP through-hole package. Manufactured by Vishay Semiconductor Opto Division, this component is designated as Last Time Buy, indicating discontinued production. Alternative equivalent parts are necessary for new designs and ongoing production requirements where component availability is critical.

Substiute Parts

ILQ74

Vishay Semiconductor Opto DivisionIn Stock: 4197ILQ74 Datasheet

Current PartRFQ

ILQ74

Vishay Semiconductor Opto DivisionIn Stock: 4197ILQ74 Datasheet

MFR RecommendedRFQ

ILQ74X

Isocom Components 2004 LTDIn Stock: 1106ILQ74X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ILQ74 is determined by the following critical parameters:

• Isolation Voltage: Minimum 5300Vrms required for electrical isolation specification
• Channel Configuration: 4-channel output mandatory for pin compatibility
• Output Type: Transistor output required for circuit functionality
• Package: 16-DIP through-hole form factor for mechanical and electrical compatibility
• Current Transfer Ratio: Minimum 12.5% to ensure adequate signal transmission
• Operating Temperature Range: Must encompass the application's thermal requirements
• Compliance: RoHS3 and REACH compliance for regulatory alignment

The ILQ74X from Isocom Components 2004 LTD meets these substitution criteria while maintaining functional equivalence within the specified parameter tolerances.

Parameter Comparison

Engineering Selection Recommendations

ILQ74 (Vishay): Original manufacturer part. Last Time Buy status indicates production discontinuation. Suitable for existing inventory management and legacy system support where extended temperature range (-55°C to 100°C) is required.

ILQ74X (Isocom): Active product status with current manufacturing availability. Meets all critical substitution parameters. The ILQ74X provides superior electrical performance in output voltage capability (50V vs 20V) and lower saturation voltage (400mV vs 500mV). Operating temperature range (-25°C to 100°C) is suitable for standard industrial applications. RoHS3 and REACH compliance maintained.

Selection between these parts depends on application temperature requirements and component availability constraints. The ILQ74X is the preferred choice for new designs due to active product status and enhanced electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can ILQ74X replace ILQ74 in existing designs? A: Yes. Both parts share identical isolation voltage (5300Vrms), channel count (4), output type (transistor), and 16-DIP package. Pin compatibility is maintained. Verify application operating temperature range does not exceed -25°C to 100°C limits of ILQ74X.

Q: What are the key differences between ILQ74 and ILQ74X? A: Primary differences are product status (Last Time Buy vs Active), operating temperature range (-55°C to 100°C vs -25°C to 100°C), maximum output voltage (20V vs 50V), and saturation voltage (500mV vs 400mV). All critical isolation and channel specifications are identical.

Q: Are both parts mechanically compatible? A: Yes. Both use 16-DIP (0.300", 7.62mm) through-hole packaging with identical pin configuration, enabling direct PCB footprint compatibility.

Q: Do both parts meet compliance requirements? A: Yes. Both ILQ74 and ILQ74X are RoHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which part should be selected for new production? A: ILQ74X is recommended for new designs due to active manufacturing status and superior electrical performance specifications.