OPIA4N33ATR Equivalent & Substitute Parts

Part Overview

The OPIA4N33ATR is an optoisolator with Darlington output and base connection, manufactured by TT Electronics / Optek Technology. This component provides 5000Vrms isolation in a 6-SMD surface mount package and is designed for applications requiring high-voltage galvanic isolation with Darlington output configuration. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system support and new designs requiring similar functionality.

Substiute Parts

OPIA4N33ATR

TT Electronics / Optek TechnologyIn Stock: 1133OPIA4N33ATR Datasheet

Current PartRFQ

H11B1SR2M

onsemiIn Stock: 4411H11B1SR2M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPIA4N33ATR is based on the following critical parameters that must be maintained or exceeded:

• Isolation Voltage: Minimum 5000Vrms required for equivalent functionality
• Output Configuration: Darlington with Base output type
• Number of Channels: Single channel (1 channel)
• Current Transfer Ratio: Minimum 500% to ensure adequate gain
• Maximum Output Voltage: 30V capability
• Maximum Output Current: 150mA per channel
• Vce Saturation: Maximum 1V for switching performance
• Package Type: 6-SMD, Gull Wing surface mount
• Operating Temperature Range: Must support -30°C to 100°C minimum

The H11B1SR2M from onsemi qualifies as a substitute despite a lower isolation voltage specification (4170Vrms versus 5000Vrms) because it maintains all other critical electrical and mechanical parameters within acceptable tolerances for most applications. However, applications requiring the full 5000Vrms isolation specification must verify compatibility before substitution.

Parameter Comparison

Engineering Selection Recommendations

The H11B1SR2M is an active product from onsemi and represents the primary substitute for the obsolete OPIA4N33ATR. Key considerations for selection:

Product Status: The H11B1SR2M maintains active production status, ensuring long-term availability and supply chain stability compared to the obsolete OPIA4N33ATR.

Compliance: The H11B1SR2M is ROHS3 compliant, providing environmental compliance advantages over the original part. Both components are REACH unaffected and carry EAR99 ECCN classification.

Isolation Voltage Differential: The H11B1SR2M operates at 4170Vrms isolation versus the OPIA4N33ATR's 5000Vrms. Applications with isolation requirements below 4170Vrms can substitute directly. Applications requiring the full 5000Vrms specification must evaluate whether the 830Vrms reduction impacts system safety margins.

Electrical Performance: Both parts maintain identical output voltage (30V max), output current (150mA), and Vce saturation (1V max) specifications. The H11B1SR2M demonstrates superior current transfer ratio performance at lower input current (500% @ 1mA versus 500% @ 10mA), indicating better sensitivity.

Temperature Range: The H11B1SR2M extends the lower operating temperature to -40°C, providing broader environmental coverage than the OPIA4N33ATR's -30°C minimum.

Package Compatibility: Both components use identical 6-SMD Gull Wing surface mount packaging, enabling direct PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can the H11B1SR2M directly replace the OPIA4N33ATR in all applications?

A: Direct replacement is possible for applications where isolation voltage requirements are 4170Vrms or lower. Applications specifically designed for 5000Vrms isolation must evaluate the voltage margin reduction. Electrical performance, package compatibility, and output characteristics are equivalent.

Q: What is the significance of the Current Transfer Ratio specification difference (@ 10mA versus @ 1mA)?

A: The H11B1SR2M achieves 500% current transfer ratio at 1mA input current, while the OPIA4N33ATR requires 10mA input to achieve the same ratio. This indicates the H11B1SR2M has superior input sensitivity and can operate effectively with lower input drive currents, reducing input circuit power requirements.

Q: Are there package compatibility concerns when substituting?

A: No. Both the OPIA4N33ATR and H11B1SR2M use identical 6-SMD Gull Wing surface mount packaging. PCB footprints, reflow profiles, and assembly processes remain unchanged.

Q: What compliance advantages does the H11B1SR2M offer?

A: The H11B1SR2M is ROHS3 compliant, meeting current environmental regulations. Both parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: How does the extended temperature range of the H11B1SR2M affect substitution?

A: The H11B1SR2M's -40°C to 100°C operating range exceeds the OPIA4N33ATR's -30°C to 100°C range. This provides additional margin for low-temperature applications and represents an improvement over the original specification.

Q: What should be verified before substituting in high-isolation applications?

A: Applications where the 5000Vrms isolation specification is critical to system safety or regulatory compliance should verify that the 4170Vrms isolation of the H11B1SR2M meets design margins and safety standards. Isolation voltage derating, creepage distances, and clearance requirements should be reviewed against the specific application's isolation requirements.