H11A5TM Optoisolator Equivalent & Substitute Parts

Part Overview

The H11A5TM is an optoisolator transistor with base output manufactured by onsemi, rated for 7500Vpk isolation voltage in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The H11A5TM provides single-channel isolation with transistor output and base connection, suitable for applications requiring galvanic isolation in DC input circuits.

Substiute Parts

H11A5TM

onsemiIn Stock: 12465H11A5TM 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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H11A5G

Isocom Components 2004 LTDIn Stock: 772H11A5G Datasheet

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H11A5M

Fairchild SemiconductorIn Stock: 12202H11A5M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the H11A5TM is determined by the following critical parameters:

Primary Substitution Criteria:

• Number of Channels: 1 (single channel required)
• Output Type: Transistor with Base (functional output configuration)
• Input Type: DC (input signal type)
• Mounting Type: Through Hole (PCB assembly compatibility)
• Package / Case: 6-DIP form factor (physical footprint)

Secondary Compatibility Parameters:

• Voltage - Isolation: Minimum 7500Vpk (isolation rating must meet or exceed)
• Current Transfer Ratio (Min): Minimum 30% @ 10mA (optical coupling efficiency)
• Turn On / Turn Off Time: Maximum 2µs (switching speed requirement)
• Operating Temperature: Must encompass -40°C ~ 100°C range
• Vce Saturation (Max): 400mV (output transistor saturation characteristic)

Substitute parts are grouped based on matching these criteria. Parts with identical isolation voltage, CTR, and switching characteristics are direct substitutes. Parts with lower isolation voltage or reduced CTR are listed but require application-level verification of suitability.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Identical Isolation Voltage and CTR):

H11A5M and H11A5G both match the H11A5TM in isolation voltage (7500Vpk or equivalent) and current transfer ratio (30% @ 10mA). H11A5G is currently active in production, making it the preferred choice for new designs requiring long-term availability. H11A5M remains obsolete but is functionally equivalent. Both maintain through-hole 6-DIP packaging compatible with H11A5TM PCB layouts.

Functional Substitutes (Reduced Isolation Voltage):

H11A3M and H11A5M from Fairchild Semiconductor provide 5000Vrms isolation, which is lower than the H11A5TM specification. These parts are suitable only for applications where the reduced isolation voltage meets system requirements. Both offer extended operating temperature range (-55°C ~ 110°C) and higher maximum output voltage (80V), providing additional design flexibility in specific applications.

Limited Substitutes (Reduced CTR and Isolation):

H11A4M provides 7500Vpk isolation matching the main part but with reduced current transfer ratio (10% @ 10mA). This part is suitable only where lower optical coupling efficiency is acceptable. H11A2M offers 7500Vpk isolation with 20% CTR but requires surface-mount assembly, incompatible with through-hole PCB designs.

Compliance and Availability:

All onsemi parts (H11A5TM, H11A2M, H11A4M) maintain REACH Unaffected status. H11A5G from Isocom Components 2004 LTD is the only active product in this group, providing the best long-term supply assurance. Fairchild Semiconductor parts (H11A3M, H11A5M) lack documented REACH status in provided specifications.

Frequently Asked Questions (FAQ)

Q: Can H11A5G replace H11A5TM directly in existing designs?

A: H11A5G is functionally equivalent in isolation voltage (7.5Vpk specification differs in notation but represents equivalent isolation), current transfer ratio (30% @ 10mA), and 6-DIP through-hole packaging. The primary advantage is active product status, ensuring continued availability. Verify application-specific requirements for operating temperature range, as H11A5G supports -55°C ~ 100°C versus H11A5TM's -40°C ~ 100°C.

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

A: These represent different measurement standards for isolation voltage. 7500Vpk (peak voltage) and 5000Vrms (root mean square voltage) are not directly equivalent. Parts specified with lower isolation voltage (H11A3M, H11A5M at 5000Vrms) must be evaluated against circuit isolation requirements before substitution.

Q: Why is H11A2M listed as a substitute if it uses surface-mount packaging?

A: H11A2M is electrically equivalent to H11A5TM (7500Vpk isolation, 20% CTR) but requires surface-mount assembly. It is listed for reference in designs undergoing PCB redesign or where surface-mount technology is preferred. Direct substitution in existing through-hole layouts is not possible without PCB modification.

Q: Is H11A4M suitable as a substitute despite lower current transfer ratio?

A: H11A4M provides 7500Vpk isolation matching H11A5TM but with reduced CTR (10% @ 10mA versus 30%). Substitution is possible only if circuit design accommodates lower optical coupling efficiency. Applications with tight input current budgets or requiring maximum output current may not tolerate this reduction.

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

A: H11A5G from Isocom Components 2004 LTD is the only active product among all listed parts. All other substitutes are classified as obsolete. For new designs or production requiring extended supply assurance, H11A5G is the recommended selection.

Q: Are there temperature range differences between H11A5TM and its substitutes?

A: Yes. H11A5TM operates -40°C ~ 100°C. H11A5G supports -55°C ~ 100°C (wider low-temperature range). H11A3M and H11A5M support -55°C ~ 110°C (extended range in both directions). Verify application temperature requirements before substitution.

Q: Can H11A5M be used in place of H11A5TM?

A: H11A5M matches H11A5TM in current transfer ratio (30% @ 10mA) and through-hole 6-DIP packaging but provides only 5000Vrms isolation versus 7500Vpk. Substitution is valid only if circuit isolation requirements are met at the lower voltage rating. H11A5M also offers higher maximum output voltage (80V versus 30V) and extended temperature range.