ISD203 Equivalent & Substitute Parts

Part Overview

The ISD203 is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation with a single channel configuration, rated for 7.5Vpk isolation voltage. The device is actively produced and maintained in inventory, serving applications requiring DC input signal isolation with transistor-based output switching. Substitute parts are identified when equivalent electrical and mechanical parameters align with the ISD203 specifications, enabling direct replacement in compatible circuit designs.

Substiute Parts

ISD203

Isocom Components 2004 LTDIn Stock: 5303ISD203 Datasheet

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ILD5

Isocom Components 2004 LTDIn Stock: 1802ILD5 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISD203 are identified based on the following critical parameters that determine functional equivalence:

• Isolation Voltage: 7.5Vpk (matching requirement)
• Number of Channels: 1 (single channel configuration)
• Output Type: Transistor (output switching mechanism)
• Package / Case: 8-DIP (0.300", 7.62mm) (mechanical compatibility)
• Mounting Type: Through Hole (PCB assembly method)
• Maximum Output Voltage: 70V (load switching capability)
• Maximum Output Current: 50mA per channel (current handling)
• Vce Saturation: 400mV (output saturation characteristic)
• Operating Temperature Range: -25°C ~ 100°C (thermal operating window)

The ILD5 qualifies as a substitute part because it maintains equivalence across all critical electrical and mechanical parameters, despite variations in Current Transfer Ratio specifications and switching time characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the ISD203 and ILD5 maintain active product status with ROHS3 compliance and REACH unaffected certification. Selection between these parts should be based on Current Transfer Ratio requirements specific to the application circuit. The ISD203 provides a higher minimum Current Transfer Ratio (225% vs. 50%), while the ILD5 offers a lower minimum threshold with comparable maximum performance (400% vs. 450%). Both components are suitable for through-hole PCB assembly in 8-DIP package configurations and operate within the identical temperature range of -25°C to 100°C. Compliance certifications and regulatory status are equivalent across both parts.

Frequently Asked Questions (FAQ)

Q: Can the ILD5 directly replace the ISD203 in existing circuit designs?

A: Direct replacement is possible when the application circuit tolerates the ILD5's lower minimum Current Transfer Ratio of 50% @ 10mA compared to the ISD203's 225% @ 10mA. Both parts share identical isolation voltage, output voltage rating, output current capability, saturation voltage, operating temperature range, and 8-DIP package configuration.

Q: What is the primary electrical difference between the ISD203 and ILD5?

A: The Current Transfer Ratio specifications differ. The ISD203 specifies 225-450% @ 10mA, while the ILD5 specifies 50-400% @ 10mA. This parameter affects the optical coupling efficiency between the input LED and output transistor stages.

Q: Are both parts suitable for the same PCB assembly process?

A: Yes. Both the ISD203 and ILD5 use identical 8-DIP (0.300", 7.62mm) through-hole packaging, enabling use of the same PCB footprint and assembly methodology.

Q: Do compliance and regulatory certifications differ between these parts?

A: No. Both parts maintain ROHS3 compliance, REACH unaffected status, and identical Moisture Sensitivity Level (MSL) rating of 1 (Unlimited).

Q: What operating temperature range applies to both optoisolators?

A: Both the ISD203 and ILD5 operate across the identical temperature range of -25°C to 100°C.