H11C4 Optoisolator - Equivalent & Substitute Parts

Part Overview

The H11C4 is an optoisolator with SCR output, rated for 5300Vrms isolation voltage, designed for single-channel applications requiring galvanic isolation in through-hole 6-DIP packaging. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The H11C4 serves applications requiring high-voltage isolation with SCR switching characteristics and is suitable for industrial control and power management circuits.

Substiute Parts

H11C4

onsemiIn Stock: 1346H11C4 Datasheet

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MOC3022M

onsemiIn Stock: 93737MOC3022M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the H11C4 is constrained by the following critical parameters:

• Isolation Voltage: The H11C4 provides 5300Vrms isolation. Substitute parts must maintain isolation voltage at or above this specification to preserve circuit safety margins.
• Output Type: The H11C4 features SCR output. While functionally different output types (such as Triac) may operate in certain applications, they represent a change in switching characteristics and circuit behavior.
• Package Compatibility: The 6-DIP through-hole package is a fixed mechanical requirement for board-level compatibility.
• Number of Channels: Single-channel configuration is required.
• Operating Temperature Range: The H11C4 operates from -55°C to 100°C. Substitute parts with narrower temperature ranges may not be suitable for all deployment environments.

The MOC3022M is identified as a substitute part. However, it exhibits the following parameter differences:

• Isolation voltage is 4170Vrms (lower than H11C4)
• Output type is Triac (different from H11C4 SCR output)
• Operating temperature range is -40°C to 85°C (narrower than H11C4)
• Product status is Active (versus Obsolete for H11C4)

Parameter Comparison

Engineering Selection Recommendations

The MOC3022M is listed as a substitute for the H11C4. Selection between these parts must account for the following factors:

Product Status: The H11C4 is obsolete, while the MOC3022M is active. For new designs or long-term production support, the MOC3022M offers ongoing availability and manufacturer support.

Isolation Voltage Differential: The MOC3022M provides 4170Vrms isolation compared to the H11C4's 5300Vrms. Applications requiring the full 5300Vrms isolation margin cannot use the MOC3022M as a direct substitute without circuit redesign.

Output Type Change: The H11C4 uses SCR output; the MOC3022M uses Triac output. These represent different switching topologies. SCR output conducts in one direction only, while Triac output conducts bidirectionally. Circuit compatibility depends on the specific application requirements.

Temperature Range: The MOC3022M operates from -40°C to 85°C, which is narrower than the H11C4's -55°C to 100°C range. Applications requiring extended temperature operation may not be compatible with the MOC3022M.

Regulatory Compliance: The H11C4 carries UR approval; the MOC3022M carries UL approval. Both are REACH Unaffected and classified as EAR99. Regulatory requirements for the target application determine which approval is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the MOC3022M directly replace the H11C4 in existing designs?

A: Direct replacement is not guaranteed. The MOC3022M differs in isolation voltage (4170Vrms vs. 5300Vrms), output type (Triac vs. SCR), and operating temperature range (-40°C to 85°C vs. -55°C to 100°C). Circuit validation is required to confirm compatibility with these parameter changes.

Q: What is the primary difference between SCR and Triac output in optoisolators?

A: SCR output conducts current in one direction only (unidirectional), while Triac output conducts in both directions (bidirectional). Application circuits must be designed to accommodate the specific output type.

Q: Does the lower isolation voltage of the MOC3022M affect safety?

A: The MOC3022M's 4170Vrms isolation is lower than the H11C4's 5300Vrms. Applications designed for 5300Vrms isolation may not meet safety or performance requirements with the reduced isolation voltage. Circuit analysis is necessary to determine if the lower rating is acceptable for the specific application.

Q: Are both parts available in the same package?

A: Yes. Both the H11C4 and MOC3022M are packaged in 6-DIP (0.300", 7.62mm) through-hole format, ensuring mechanical compatibility on printed circuit boards.

Q: What is the significance of the H11C4 being obsolete?

A: Obsolete status indicates the H11C4 is no longer manufactured. For new designs or production continuity, an active substitute such as the MOC3022M should be evaluated. Existing inventory of the H11C4 may be available from component distributors.