ISQ74G Equivalent & Substitute Parts

Part Overview

The ISQ74G is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation up to 5300Vrms with a single channel configuration in a 16-DIP package. The part is currently active in production with 838 units in stock. Alternative part numbers may be required due to inventory constraints, supply chain disruptions, or specific procurement requirements from authorized distributors.

Substiute Parts

ISQ74G

Isocom Components 2004 LTDIn Stock: 941ISQ74G Datasheet

Current PartRFQ

ISQ74XG

Isocom Components 2004 LTDIn Stock: 725ISQ74XG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The ISQ74G has one parametric equivalent substitute: ISQ74XG. This substitution is valid based on the following criteria:

Substitution-Determining Parameters:

• Voltage - Isolation: 5300Vrms (identical)
• Current Transfer Ratio (Min): 12.5% @ 16mA (identical)
• Output Type: Transistor (identical)
• Voltage - Output (Max): 50V (identical)
• Current - Output / Channel: 50mA (identical)
• Voltage - Forward (Vf) (Typ): 1.2V (identical)
• Current - DC Forward (If) (Max): 50mA (identical)
• Rise / Fall Time (Typ): 2.6µs, 2.2µs (identical)
• Operating Temperature: -25°C ~ 100°C (identical)
• Package / Case: 16-DIP (0.400", 10.16mm) (identical)
• Mounting Type: Through Hole (identical)

All critical electrical and mechanical parameters match exactly between the main part and the substitute, confirming functional and physical interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Both ISQ74G and ISQ74XG are active production parts from Isocom Components 2004 LTD with identical electrical and mechanical specifications. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. Selection between these parts should be based on availability and procurement lead times, as all functional parameters are equivalent. The ISQ74G currently has higher inventory (838 units) compared to ISQ74XG (667 units).

Frequently Asked Questions (FAQ)

Q: Can ISQ74XG be used as a direct replacement for ISQ74G? A: Yes. ISQ74XG is a parametric equivalent with identical isolation voltage (5300Vrms), current transfer ratio (12.5% @ 16mA), output characteristics (50V max, 50mA per channel), timing parameters (2.6µs rise, 2.2µs fall), and 16-DIP package configuration. No circuit modifications are required.

Q: Are there any differences in compliance or certifications between these parts? A: No. Both parts carry identical RoHS3 compliance status and REACH unaffected designation. Both have MSL rating of 1 (Unlimited).

Q: What determines substitutability for the ISQ74G optoisolator? A: Substitutability is determined by matching isolation voltage, current transfer ratio, output voltage and current ratings, timing characteristics, operating temperature range, and physical package dimensions. All these parameters are identical between ISQ74G and ISQ74XG.

Q: Can these parts be used interchangeably in PCB designs? A: Yes. The identical 16-DIP (0.400", 10.16mm) package and through-hole mounting type ensure mechanical and electrical interchangeability without PCB layout modifications.

Q: Which part should be selected if both are available? A: Selection should be based on procurement availability and lead times. Both parts are functionally identical and equally suitable for applications requiring single-channel optoisolation at 5300Vrms with transistor output.