IL252 Optoisolator Equivalent & Substitute Parts

Part Overview

The IL252 is an optoisolator transistor with base output manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation rated at 5300Vrms with a single channel configuration in a 6-DIP through-hole package. The device accepts AC or DC input signals and delivers transistor output with base access, suitable for applications requiring high-voltage isolation and switching functionality.

The IL252 maintains active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified based on matching electrical isolation characteristics, output configuration, package form factor, and operational temperature ranges within acceptable engineering tolerances.

Substiute Parts

IL252

Vishay Semiconductor Opto DivisionIn Stock: 9815IL252 Datasheet

Current PartRFQ

H11AA4VM

onsemiIn Stock: 12157H11AA4VM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IL252 is determined by the following critical parameters:

Isolation Voltage: The IL252 operates at 5300Vrms isolation. Substitute parts must maintain isolation voltage at or above this specification to preserve circuit safety margins and regulatory compliance.

Output Configuration: The IL252 provides transistor output with base access. Substitute parts must deliver identical output topology to ensure pin-compatible operation without circuit redesign.

Package Form Factor: The IL252 uses 6-DIP through-hole packaging (0.300", 7.62mm). Substitute parts must match this package specification for direct board-level replacement.

Input Signal Type: The IL252 accepts both AC and DC input signals. Substitute parts must support the same input flexibility.

Electrical Characteristics: Current transfer ratio, Vce saturation, and forward voltage specifications must remain within acceptable ranges to maintain circuit performance.

Compliance & Status: Substitute parts must maintain active product status and RoHS3 compliance to meet procurement and regulatory requirements.

The H11AA4VM from onsemi is identified as a manufacturer-recommended substitute based on matching output configuration, package form factor, input type compatibility, and compliance certifications, with documented isolation voltage and thermal operating range within acceptable engineering parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (IL252): The IL252 is the specified component and remains the first choice for new designs and existing applications. It provides the highest isolation voltage rating (5300Vrms) and the widest operating temperature range (-55°C to 100°C), delivering maximum design margin for demanding environments.

Substitute Selection (H11AA4VM): The H11AA4VM is suitable for applications where the IL252 is unavailable or where supply constraints require alternative sourcing. This substitute maintains identical output configuration, package form factor, and input signal compatibility. The H11AA4VM operates at 4170Vrms isolation, which is lower than the IL252 but remains suitable for applications not requiring the full 5300Vrms isolation margin. The operating temperature range of -40°C to 100°C is narrower at the lower bound but covers standard industrial and commercial temperature requirements.

Both components maintain active product status and full RoHS3 compliance, ensuring regulatory alignment and long-term availability. Selection between these parts should be based on application-specific isolation voltage requirements and operating temperature constraints.

Frequently Asked Questions (FAQ)

Q: Can the H11AA4VM directly replace the IL252 in existing designs?

A: The H11AA4VM provides pin-compatible replacement in 6-DIP through-hole applications. Both components feature identical output configuration (transistor with base), matching input type (AC/DC), and equivalent electrical characteristics (Vce saturation, current transfer ratio). Direct substitution is possible provided the application isolation voltage requirement does not exceed 4170Vrms and the operating temperature range remains within -40°C to 100°C.

Q: What is the isolation voltage difference between IL252 and H11AA4VM?

A: The IL252 provides 5300Vrms isolation while the H11AA4VM provides 4170Vrms isolation. The IL252 offers 1130Vrms additional isolation margin. Applications requiring maximum isolation voltage specification must use the IL252. Applications with isolation requirements at or below 4170Vrms can use either component.

Q: Are both components RoHS3 compliant?

A: Yes. Both the IL252 and H11AA4VM are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement and environmental compliance.

Q: What is the operating temperature difference?

A: The IL252 operates from -55°C to 100°C while the H11AA4VM operates from -40°C to 100°C. The IL252 supports 15°C lower minimum temperature operation. Applications requiring operation below -40°C must use the IL252.

Q: Are the package dimensions identical?

A: Yes. Both components use 6-DIP through-hole packaging with 0.300" (7.62mm) spacing. Board-level footprints and PCB layouts are identical, enabling direct physical replacement without layout modification.

Q: What is the current output difference?

A: The H11AA4VM specifies 50mA maximum output current per channel. The IL252 does not specify this parameter in the provided data. Both components specify identical maximum DC forward current (60mA) and Vce saturation (400mV), indicating comparable output drive capability.

Q: Can these components be used interchangeably in new designs?

A: Component selection for new designs should prioritize the IL252 as the primary choice due to higher isolation voltage rating and wider operating temperature range. The H11AA4VM is suitable for new designs where isolation voltage requirements are confirmed at or below 4170Vrms and operating temperature remains within -40°C to 100°C.