H11A2TM Optoisolator Equivalent & Substitute Parts

Part Overview

The H11A2TM is a 7500Vpk optoisolator transistor with base output manufactured by onsemi in a 6-DIP through-hole package. This component provides galvanic isolation for single-channel signal transmission with integrated base drive capability. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

H11A2TM

onsemiIn Stock: 853H11A2TM Datasheet

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H11A2G

Isocom Components 2004 LTDIn Stock: 1113H11A2G Datasheet

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H11A2M

onsemiIn Stock: 12552H11A2M Datasheet

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H11A3M

Fairchild SemiconductorIn Stock: 12690H11A3M Datasheet

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H11A4M

onsemiIn Stock: 12682H11A4M Datasheet

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H11A5M

Fairchild SemiconductorIn Stock: 12202H11A5M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the H11A2TM is determined by the following critical parameters:

• Isolation Voltage: Minimum 7500Vpk or equivalent rating
• Output Configuration: Transistor with base output required
• Current Transfer Ratio: Minimum 20% @ 10mA
• Package Type: 6-DIP through-hole mounting
• Output Voltage Rating: 30V or higher
• Vce Saturation: 400mV or lower
• Input Type: DC
• Number of Channels: Single channel

Substitute parts are grouped into two categories based on mounting compatibility:

Category 1 - Through-Hole DIP Equivalents: H11A2G, H11A3M, H11A4M, H11A5M. These maintain the 6-DIP through-hole package and are direct board-level replacements.

Category 2 - Surface Mount Alternative: H11A2M. This part shares electrical specifications but uses 6-SMD surface-mount packaging and requires PCB redesign.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: H11A2G

The H11A2G is the recommended substitute for H11A2TM applications. It maintains identical electrical specifications including 7.5Vpk isolation voltage, 20% minimum current transfer ratio, 30V maximum output voltage, and 400mV Vce saturation. The H11A2G uses the same 6-DIP (0.400", 10.16mm) through-hole package, enabling direct board-level replacement without PCB modification. The part is currently active in production and ROHS3 compliant, providing long-term availability and regulatory compliance advantages over the obsolete H11A2TM.

Secondary Substitutes: H11A3M and H11A5M

H11A3M and H11A5M are functionally compatible through-hole alternatives with the same 6-DIP package footprint. Both parts feature higher maximum output voltage ratings (80V versus 30V) and extended operating temperature ranges (-55°C to 110°C). However, both use 5000Vrms isolation voltage, which is lower than the H11A2TM specification. H11A5M offers superior current transfer ratio performance (30% minimum) compared to H11A2TM (20% minimum). These parts are suitable for applications where the lower isolation voltage is acceptable and the enhanced output voltage capability is beneficial.

Alternative: H11A4M

H11A4M provides 7500Vpk isolation voltage matching the H11A2TM but features a reduced 6-DIP (0.300", 7.62mm) package footprint and lower 10% minimum current transfer ratio. This part is suitable only for applications with relaxed current transfer ratio requirements and where the smaller package footprint is advantageous.

Surface Mount Option: H11A2M

H11A2M is electrically identical to H11A2TM but uses 6-SMD surface-mount packaging. This part is appropriate only for new PCB designs incorporating surface-mount assembly processes and is not suitable for direct replacement in through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can H11A2G directly replace H11A2TM on existing PCBs?

A: Yes. H11A2G uses the same 6-DIP (0.400", 10.16mm) through-hole package and maintains all critical electrical parameters including isolation voltage, current transfer ratio, output voltage rating, and saturation characteristics. No PCB modification is required.

Q: What is the difference between 7500Vpk and 5000Vrms isolation voltage ratings?

A: These represent different measurement standards for isolation voltage. 7500Vpk (peak voltage) and 5000Vrms (root mean square voltage) are not directly equivalent. Applications requiring 7500Vpk isolation must use parts with that specification. H11A3M and H11A5M with 5000Vrms ratings are not suitable substitutes if 7500Vpk isolation is a design requirement.

Q: Why does H11A4M have a lower current transfer ratio minimum (10% versus 20%)?

A: H11A4M is a different variant within the H11A family with different LED and transistor characteristics. The 10% minimum current transfer ratio may result in reduced output current for the same input current. Verify that the application can tolerate this reduced performance before substitution.

Q: Is H11A2M suitable for replacing H11A2TM in existing designs?

A: No. H11A2M uses 6-SMD surface-mount packaging while H11A2TM uses 6-DIP through-hole packaging. Direct replacement is not possible without PCB redesign and assembly process changes. H11A2M is appropriate only for new surface-mount designs.

Q: Which substitute offers the best long-term availability?

A: H11A2G is the only active production part among the substitutes listed. It is ROHS3 compliant and currently in stock, providing superior long-term availability and regulatory compliance compared to obsolete alternatives.

Q: Can H11A5M be used in applications requiring 7500Vpk isolation?

A: No. H11A5M provides 5000Vrms isolation voltage, which does not meet 7500Vpk requirements. Use only parts with 7500Vpk or higher isolation voltage specifications for applications with this requirement.