IL440-4 Optoisolator Equivalent & Substitute Parts

Part Overview

The IL440-4 is a 5.3kV isolation optoisolator with triac output manufactured by Vishay Semiconductor Opto Division in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The IL440-4 provides single-channel triac isolation suitable for AC switching and control circuits requiring high voltage isolation.

Substiute Parts

IL440-4

Vishay Semiconductor Opto DivisionIn Stock: 12611IL440-4 Datasheet

Current PartRFQ

EL3021

Everlight Electronics Co LtdIn Stock: 66589EL3021 Datasheet

MFR RecommendedRFQ

EL3022

Everlight Electronics Co LtdIn Stock: 24994EL3022 Datasheet

MFR RecommendedRFQ

EL3023

Everlight Electronics Co LtdIn Stock: 83402EL3023 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IL440-4 is based on the following critical parameters that must be maintained or exceeded:

• Isolation Voltage: Minimum 5000Vrms (IL440-4 provides 5300Vrms)
• Output Type: Triac configuration required
• Number of Channels: Single channel
• Package Type: 6-DIP through-hole form factor
• Voltage - Off State: 400 V
• Current - On State (It (RMS)): 100 mA maximum
• Mounting Configuration: Through-hole compatibility

The three substitute parts (EL3021, EL3022, EL3023) from Everlight Electronics Co Ltd meet these core requirements. All three maintain the 5000Vrms isolation voltage, 400V off-state voltage, 100mA on-state current rating, and identical 6-DIP package configuration. Differences exist in LED trigger current (Ift) specifications and hold current (Ih) characteristics, which determine suitability for specific circuit designs.

Parameter Comparison

Engineering Selection Recommendations

All three Everlight substitute parts (EL3021, EL3022, EL3023) are active products with current manufacturing status, providing supply continuity for IL440-4 replacement applications. Each substitute maintains ROHS3 compliance and carries regulatory approvals from CSA, DEMKO, FIMKO, NEMKO, SEMKO, and UL certifications.

EL3021 matches the IL440-4 LED trigger current specification at 15mA maximum, making it the closest functional equivalent for circuits designed around the original trigger current requirement.

EL3022 reduces the LED trigger current to 10mA maximum, suitable for applications where lower input drive current is acceptable or preferred.

EL3023 provides the lowest LED trigger current at 5mA maximum, appropriate for circuits requiring minimal input power or where LED drive current is constrained.

All three substitutes feature improved static dV/dt performance (100V/µs versus 50V/µs), lower hold current (250µA versus 1mA), and extended low-temperature operating range (-55°C versus -40°C). The 5000Vrms isolation voltage of the Everlight parts remains within acceptable margins for applications originally specified at 5300Vrms.

Frequently Asked Questions (FAQ)

Q: Can EL3021, EL3022, or EL3023 directly replace IL440-4 in existing designs?

A: Yes, all three Everlight parts are pin-compatible 6-DIP through-hole substitutes. The primary design consideration is LED trigger current: EL3021 matches the original 15mA specification, while EL3022 and EL3023 require lower input drive currents. Circuit input impedance and drive capability must accommodate the selected part's trigger current requirement.

Q: What is the significance of the 300Vrms difference in isolation voltage between IL440-4 and the Everlight substitutes?

A: The IL440-4 specifies 5300Vrms isolation while the Everlight parts specify 5000Vrms. Both exceed typical industrial isolation requirements. Selection depends on application-specific isolation voltage margins. If the original design required the full 5300Vrms specification, the 5000Vrms rating may not be suitable.

Q: How do the hold current differences affect circuit operation?

A: The IL440-4 specifies 1mA typical hold current while all Everlight substitutes specify 250µA typical. Lower hold current in the Everlight parts reduces the minimum current required to maintain triac conduction, potentially affecting circuit stability in low-current switching applications.

Q: Are all three Everlight parts suitable for the same applications?

A: EL3021, EL3022, and EL3023 differ primarily in LED trigger current specifications. Select based on your circuit's input drive capability: EL3021 for 15mA drive circuits, EL3022 for 10mA drive circuits, and EL3023 for 5mA drive circuits. All three maintain identical output characteristics and package configuration.

Q: What regulatory approvals apply to these substitute parts?

A: All three Everlight substitutes carry CSA, DEMKO, FIMKO, NEMKO, SEMKO, and UL approvals. The IL440-4 carries BSI, CSA, cUR, and UR approvals. Verify that the selected substitute's approval agencies meet your application's regulatory requirements.