H11B33S Equivalent & Substitute Parts

Part Overview

The H11B33S is an optoisolator Darlington with base output manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The H11B33S functions as a single-channel optoisolator with Darlington output configuration, suitable for applications requiring galvanic isolation with DC input control. The obsolete status necessitates identification of active alternative components that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

H11B33S

onsemiIn Stock: 874H11B33S Datasheet

Current PartRFQ

4N30SM

Fairchild SemiconductorIn Stock: 222494N30SM Datasheet

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H11B3SM

Isocom Components 2004 LTDIn Stock: 12443H11B3SM Datasheet

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H11B3SMT&R

Isocom Components 2004 LTDIn Stock: 817H11B3SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the H11B33S is determined by the following critical parameters:

• Package / Case: 6-SMD, Gull Wing (physical and electrical interface compatibility)
• Output Type: Darlington with Base (functional output configuration)
• Number of Channels: 1 (single-channel isolation requirement)
• Input Type: DC (control signal type)
• Mounting Type: Surface Mount (assembly process compatibility)

Substitute parts must maintain compatibility across these core parameters. Variations in isolation voltage, output voltage rating, current transfer ratio, and operating temperature range are permissible when the substitute part meets or exceeds the application requirements of the original component.

The following parts satisfy these substitution criteria:

• 4N30SM (Fairchild Semiconductor): Active status, 4170Vrms isolation, 6-SMD package
• H11B3SM (Isocom Components 2004 LTD): Active status, 7.5Vpk isolation, 6-SMD package, Tube packaging
• H11B3SMT&R (Isocom Components 2004 LTD): Active status, 7.5Vpk isolation, 6-SMD package, Tape & Reel packaging

Parameter Comparison

Engineering Selection Recommendations

4N30SM (Fairchild Semiconductor): Active product status ensures ongoing availability and manufacturing support. Isolation voltage of 4170Vrms is lower than the H11B33S specification; this substitute is suitable only for applications where the lower isolation rating is acceptable. Output voltage rating of 30V exceeds the original 25V specification. Current transfer ratio requirement shifts to 100% @ 10mA, requiring higher input current. Operating temperature range of -40°C ~ 100°C is narrower than the original -55°C ~ 100°C.

H11B3SM (Isocom Components 2004 LTD): Active product status with RoHS3 compliance and REACH Unaffected designation. Isolation voltage specification of 7.5Vpk significantly exceeds the H11B33S 5300Vrms rating. Output voltage rating of 30V exceeds original specification. Current transfer ratio matches at 100% @ 1mA. Turn-on and turn-off times are substantially longer (125µs and 100µs respectively) compared to the original 25µs and 18µs. Operating temperature range matches the original -55°C ~ 100°C. Tube packaging is suitable for manual assembly and component handling.

H11B3SMT&R (Isocom Components 2004 LTD): Identical electrical specifications to H11B3SM with active product status, RoHS3 compliance, and REACH Unaffected designation. Tape & Reel packaging is optimized for automated assembly processes. Isolation voltage, output voltage, current transfer ratio, and operating temperature range are equivalent to H11B3SM.

Frequently Asked Questions (FAQ)

Q: Can the 4N30SM replace the H11B33S in all applications?

A: The 4N30SM is a functional substitute only for applications where the 4170Vrms isolation voltage is sufficient. Applications requiring the full 5300Vrms isolation rating of the H11B33S cannot use the 4N30SM. Additionally, the shift in current transfer ratio from 100% @ 1mA to 100% @ 10mA requires higher input drive current, and the narrower operating temperature range (-40°C ~ 100°C versus -55°C ~ 100°C) may not be suitable for extended temperature applications.

Q: What are the key differences between H11B3SM and H11B3SMT&R?

A: H11B3SM and H11B3SMT&R are electrically identical. The primary difference is packaging: H11B3SM is supplied in Tube packaging for manual assembly, while H11B3SMT&R is supplied in Tape & Reel format for automated pick-and-place assembly. Selection between these variants depends on manufacturing process requirements.

Q: Are the H11B3SM and H11B3SMT&R suitable for low-temperature applications?

A: Yes. Both H11B3SM and H11B3SMT&R support the full operating temperature range of -55°C ~ 100°C, matching the original H11B33S specification and suitable for extended low-temperature applications.

Q: How does the isolation voltage difference affect substitution?

A: The H11B3SM and H11B3SMT&R specify 7.5Vpk isolation, which is substantially higher than the H11B33S 5300Vrms rating when converted to equivalent peak voltage. This higher isolation rating provides additional safety margin in applications requiring galvanic isolation. The 4N30SM at 4170Vrms is lower than the original specification and requires application-level verification.

Q: What packaging considerations apply to component selection?

A: All substitute parts maintain the 6-SMD, Gull Wing surface mount package, ensuring physical and electrical interface compatibility with the original H11B33S footprint. Packaging format (Bulk, Tube, or Tape & Reel) affects procurement and assembly logistics but does not impact electrical performance or board-level compatibility.