ISD74 Optoisolator Equivalent & Substitute Parts

Part Overview

The ISD74 is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 8-pin DIP component provides galvanic isolation up to 5300Vrms across 2 channels, making it suitable for applications requiring high-voltage isolation with DC input and transistor output switching capability. The part is currently in active production status with 2100 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to availability constraints, design flexibility, or supply chain optimization.

Substiute Parts

ISD74

Isocom Components 2004 LTDIn Stock: 2132ISD74 Datasheet

Current PartRFQ

ISD74X

Isocom Components 2004 LTDIn Stock: 2917ISD74X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISD74 optoisolator is determined by strict equivalence across the following critical parameters:

• Isolation Voltage: 5300Vrms (mandatory match)
• Number of Channels: 2 channels (mandatory match)
• Output Type: Transistor output (mandatory match)
• Package / Case: 8-DIP (0.300", 7.62mm) (mandatory match for PCB compatibility)
• Current Transfer Ratio (Min): 12.5% @ 16mA (mandatory match)
• Voltage - Output (Max): 50V (mandatory match)
• Current - Output / Channel: 50mA (mandatory match)
• Operating Temperature Range: -25°C ~ 100°C (mandatory match)

The ISD74X is identified as a parametric equivalent substitute. Both parts share identical electrical specifications, isolation ratings, channel configuration, and physical packaging, enabling direct substitution in circuit designs without modification.

Parameter Comparison

Engineering Selection Recommendations

Both the ISD74 and ISD74X are active production parts manufactured by Isocom Components 2004 LTD with full ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on availability and supply chain requirements. The ISD74X carries 2864 units in stock compared to 2100 units for the ISD74, providing additional inventory availability. Both parts meet identical electrical and mechanical specifications, ensuring functional interchangeability in 8-DIP through-hole applications requiring 5300Vrms isolation with 2-channel transistor output configuration.

Frequently Asked Questions (FAQ)

Q: Can ISD74X replace ISD74 in existing designs? A: Yes. The ISD74X is a parametric equivalent with identical electrical specifications, isolation voltage, channel count, output type, and 8-DIP package dimensions. Direct substitution is possible without circuit modification.

Q: What are the critical parameters for substitution compatibility? A: Isolation voltage (5300Vrms), number of channels (2), output type (transistor), package type (8-DIP), current transfer ratio (12.5% @ 16mA), maximum output voltage (50V), output current per channel (50mA), and operating temperature range (-25°C ~ 100°C) must all match exactly.

Q: Are there any compliance or certification differences between ISD74 and ISD74X? A: No. Both parts carry identical RoHS3 compliance status, REACH unaffected designation, and active product status. Moisture sensitivity level is 1 (Unlimited) for both variants.

Q: What is the physical package compatibility? A: Both parts use 8-DIP (0.300", 7.62mm) through-hole packaging with identical pin configuration and PCB footprint requirements.

Q: Which part should be selected for new designs? A: Either part is suitable for new designs. Selection may be based on current inventory levels or supplier availability. The ISD74X currently has higher stock availability (2864 units versus 2100 units).