H11B3 Equivalent & Substitute Parts

Part Overview

The H11B3 is an optoisolator with Darlington output manufactured by onsemi, featuring 5300Vrms 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 procurement.

The H11B3 provides galvanic isolation between input and output circuits with a Darlington output stage, suitable for applications requiring high isolation voltage and base-driven output control. Due to its obsolete status, alternative parts from active product lines or equivalent manufacturers must be evaluated for new designs and production continuity.

Substiute Parts

H11B3

onsemiIn Stock: 12254H11B3 Datasheet

Current PartRFQ

H11B1M

onsemiIn Stock: 12380H11B1M Datasheet

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H11B3

Fairchild SemiconductorIn Stock: 12293H11B3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the H11B3 are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Package type: 6-DIP (0.300", 7.62mm) through-hole mounting
• Output configuration: Darlington with Base
• Input type: DC
• Channel count: 1 channel
• Isolation voltage: Minimum 4170Vrms (H11B3 operates at 5300Vrms)
• Output stage saturation: Maximum 1V Vce
• Operating temperature range: Overlap with -55°C to 100°C

Substitution Logic: Parts meeting these criteria can replace the H11B3 in applications where the isolation voltage requirement does not exceed the substitute part's rating, and where output voltage and current specifications align with circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

H11B1M (onsemi) - Active Product: The H11B1M is the primary substitute for new designs and production continuity. This part is in active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The H11B1M operates at 4170Vrms isolation voltage, which is lower than the H11B3's 5300Vrms rating. Selection of this part is appropriate for applications where the isolation voltage requirement does not exceed 4170Vrms. The H11B1M features a higher current transfer ratio (500% @ 1mA) and supports higher output voltage (30V maximum) compared to the H11B3, providing greater design flexibility in output stage applications.

H11B3 (Fairchild Semiconductor) - Obsolete Alternative: The Fairchild H11B3 maintains the same part number as the onsemi H11B3 but is a separate product from a different manufacturer. This part is also classified as obsolete. It provides 5000Vrms isolation voltage, closely matching the onsemi H11B3's 5300Vrms specification. The Fairchild variant supports higher maximum output voltage (55V) but lower maximum forward current (60 mA). This part is suitable only for legacy system maintenance where the onsemi H11B3 is unavailable and isolation voltage requirements align with the 5000Vrms rating.

Compliance Considerations: The H11B1M (onsemi) is ROHS3 compliant and recommended for applications subject to RoHS regulations. Both the H11B3 (onsemi) and H11B1M (onsemi) maintain REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the H11B1M replace the H11B3 in all applications? A: The H11B1M can replace the H11B3 where the isolation voltage requirement does not exceed 4170Vrms. Both parts share identical package, mounting type, output configuration, and switching characteristics. Verify that your circuit's isolation voltage specification is compatible with the H11B1M's 4170Vrms rating before substitution.

Q: What is the key difference between the H11B3 (onsemi) and H11B3 (Fairchild)? A: Despite sharing the same part number, these are distinct products from different manufacturers. The onsemi H11B3 provides 5300Vrms isolation, while the Fairchild H11B3 provides 5000Vrms isolation. The Fairchild variant supports higher output voltage (55V maximum) but lower forward current (60 mA maximum). Both are obsolete products.

Q: Why is the H11B1M recommended over the Fairchild H11B3? A: The H11B1M is in active product status with ROHS3 compliance, ensuring ongoing availability and regulatory support. The Fairchild H11B3 is obsolete, making long-term procurement difficult. The H11B1M is the preferred choice for new designs and production continuity.

Q: Are there any temperature range limitations when substituting parts? A: The H11B1M operates from -40°C to 100°C, which is narrower than the H11B3's -55°C to 100°C range. If your application requires operation below -40°C, the H11B1M is not suitable. Verify your circuit's minimum operating temperature requirement before selecting a substitute.

Q: Do all substitute parts use the same 6-DIP package? A: Yes. The H11B3 (onsemi), H11B1M (onsemi), and H11B3 (Fairchild) all use the 6-DIP (0.300", 7.62mm) through-hole package. Pin-to-pin compatibility is maintained across all three parts, allowing direct board-level substitution without layout modifications.

Q: What are the current transfer ratio differences, and do they affect substitution? A: The H11B3 (onsemi) and H11B3 (Fairchild) specify 100% current transfer ratio at 1mA input, while the H11B1M specifies 500% at 1mA. The higher transfer ratio of the H11B1M indicates more efficient input-to-output current coupling, which may reduce input drive requirements in your circuit. This difference does not prevent substitution but may improve circuit performance.