H11D4 Optoisolator Equivalent & Substitute Parts

Part Overview

The H11D4 is a 5300Vrms optoisolator transistor with base output in 6-DIP packaging, manufactured by onsemi. This component provides galvanic isolation for DC input signals with transistor output capability. The H11D4 is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

H11D4

onsemiIn Stock: 1507H11D4 Datasheet

Current PartRFQ

H11D3M

onsemiIn Stock: 1623H11D3M Datasheet

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H11D3

Fairchild SemiconductorIn Stock: 19228H11D3 Datasheet

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H11D4

onsemiIn Stock: 1507H11D4 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the H11D4 is determined by the following critical parameters:

• Isolation Voltage: Minimum 5300Vrms required for equivalent isolation performance
• Output Configuration: Transistor with base output mandatory for circuit compatibility
• Package / Case: 6-DIP (0.300", 7.62mm) required for mechanical and electrical pin compatibility
• Mounting Type: Through hole required for PCB integration compatibility
• Output Voltage & Current Ratings: Maximum 200V output and 100mA per channel minimum
• Operating Temperature Range: Must support -55°C ~ 100°C or equivalent minimum coverage

The H11D3M and H11D3 are evaluated as substitutes based on these parameters. The H11D4 itself is included in the substitute list as a reference point.

Parameter Comparison

Engineering Selection Recommendations

H11D3M (onsemi) is the primary active substitute. This part maintains mechanical and electrical compatibility with identical package, output configuration, and maximum ratings. The H11D3M operates at 4170Vrms isolation voltage, which is lower than the H11D4's 5300Vrms specification. The H11D3M features improved current transfer ratio (20% minimum versus 10% minimum) and is currently in active production status with RoHS3 compliance. Operating temperature range is -40°C ~ 100°C, which covers the upper portion of the H11D4 range.

H11D3 (Fairchild Semiconductor) provides equivalent isolation voltage (5300Vrms) and operating temperature range (-55°C ~ 100°C) matching the H11D4. This part is also obsolete. The H11D3 offers faster switching characteristics (2.5µs turn-on, 5.5µs turn-off) and improved current transfer ratio (20% minimum). RoHS3 compliance is confirmed.

For applications requiring the full -55°C lower temperature limit and 5300Vrms isolation, the H11D3 (Fairchild) maintains complete electrical equivalence. For applications where the -40°C lower limit is acceptable and active product status is required, the H11D3M (onsemi) is the recommended selection.

Frequently Asked Questions (FAQ)

Q: Can H11D3M substitute for H11D4 in all applications?

A: H11D3M is mechanically and electrically compatible for most applications. The primary difference is isolation voltage: H11D3M provides 4170Vrms versus H11D4's 5300Vrms. Applications requiring the full 5300Vrms isolation specification must use H11D3 (Fairchild) or equivalent parts meeting this requirement. Operating temperature minimum differs: H11D3M operates to -40°C while H11D4 operates to -55°C.

Q: What is the significance of Current Transfer Ratio differences?

A: Current Transfer Ratio (CTR) determines the output current relative to input current. H11D4 specifies 10% minimum CTR at 10mA input, while H11D3M and H11D3 specify 20% minimum. Higher CTR provides greater output current for the same input drive, improving circuit efficiency and reducing input current requirements.

Q: Are all substitute parts pin-compatible?

A: Yes. All listed parts use 6-DIP (0.300", 7.62mm) through-hole packaging with identical pin configuration. Direct PCB substitution is mechanically feasible without layout modification.

Q: What compliance certifications apply to these parts?

A: H11D3M carries RoHS3 compliance and REACH Unaffected status. H11D3 carries RoHS3 compliance. H11D4 carries REACH Unaffected status. All parts are classified as EAR99 for export control purposes.

Q: Why is H11D4 listed as a substitute for itself?

A: H11D4 is included as a reference point in the substitute list. While obsolete, H11D4 remains available in inventory (1492 pcs) and may be sourced through component distributors for direct replacement in existing designs.