H11A1TM Equivalent & Substitute Parts

Part Overview

The H11A1TM is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications. This component features a 4170Vrms isolation rating and single-channel transistor output configuration in a 6-DIP package. The product is currently obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring similar functionality.

Substiute Parts

H11A1TM

onsemiIn Stock: 888H11A1TM Datasheet

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H11A1G

Isocom Components 2004 LTDIn Stock: 754H11A1G Datasheet

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H11A1M

Fairchild SemiconductorIn Stock: 1970H11A1M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the H11A1TM is determined by the following critical parameters:

• Package compatibility: 6-DIP (0.400", 10.16mm) form factor for direct board-level replacement
• Output configuration: Transistor with base output topology
• Single-channel architecture: 1-channel isolation requirement
• Isolation voltage rating: Minimum 4170Vrms or equivalent peak voltage specification
• Current transfer ratio: Minimum 50% @ 10mA
• Output voltage capability: Maximum 30V or higher
• Input type: DC input
• Saturation voltage: Maximum 400mV
• Forward current rating: Maximum 60 mA

The H11A1TM has two identified substitutes: H11A1G and H11A1M. Both maintain the same package, channel count, output type, and core electrical characteristics required for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

H11A1G (Isocom Components 2004 LTD): This substitute is active and available. It maintains identical current transfer ratio, output voltage maximum, saturation voltage, and forward current specifications. The isolation voltage specification differs in units (7.5Vpk versus 4170Vrms), requiring voltage equivalence verification for your specific application. RoHS3 compliance is provided. Suitable for applications where the isolation voltage differential is acceptable.

H11A1M (Fairchild Semiconductor): This substitute is active and available. It exceeds the isolation voltage requirement at 5000Vrms and provides higher maximum output voltage (80V versus 30V). Current transfer ratio, saturation voltage, and forward current match the original specification. Operating temperature range extends to 110°C. No RoHS status is specified in the provided data. Suitable for applications requiring higher isolation voltage margin or extended temperature operation.

Both substitutes are pin-compatible 6-DIP packages suitable for direct board-level replacement of the obsolete H11A1TM.

Frequently Asked Questions (FAQ)

Q: Can H11A1G and H11A1M be used interchangeably with H11A1TM?

A: Both H11A1G and H11A1M are functionally equivalent substitutes based on matching package, channel count, output type, current transfer ratio, and saturation voltage. Direct substitution is possible at the component level. Verify isolation voltage requirements for your specific circuit design.

Q: What is the difference between the isolation voltage specifications for H11A1G?

A: H11A1G specifies isolation voltage as 7.5Vpk, while H11A1TM and H11A1M use Vrms units. These represent different measurement standards. Confirm voltage equivalence against your circuit isolation requirements before selection.

Q: Are there temperature range differences between the substitutes?

A: H11A1TM operates -40°C to 100°C. H11A1G extends to -55°C minimum. H11A1M extends to -55°C minimum and 110°C maximum. Select based on your application's thermal environment.

Q: Do all substitutes maintain the same package footprint?

A: Yes. H11A1TM, H11A1G, and H11A1M all use 6-DIP (0.400", 10.16mm) packaging, enabling direct board-level replacement without layout modification.

Q: What compliance certifications apply to these substitutes?

A: H11A1G is RoHS3 compliant. H11A1M compliance status is not specified in available data. Both are REACH unaffected and carry EAR99 ECCN classification.