H11B33SD Optoisolator Equivalent & Substitute Parts

Part Overview

The H11B33SD is an optoisolator with Darlington output manufactured by onsemi, featuring 5300Vrms isolation voltage and single-channel configuration in 6-SMD surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The H11B33SD serves applications requiring high-voltage isolation with Darlington output characteristics and DC input control.

Substiute Parts

H11B33SD

onsemiIn Stock: 1007H11B33SD Datasheet

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4N30SM

Fairchild SemiconductorIn Stock: 222494N30SM Datasheet

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H11B1SR2VM

onsemiIn Stock: 2140H11B1SR2VM 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

Substitute parts for the H11B33SD are selected based on the following critical parameters that determine functional compatibility:

• Package / Case: All substitutes must use 6-SMD, Gull Wing surface mount configuration for PCB layout compatibility
• Output Type: All substitutes must feature Darlington with Base output topology
• Number of Channels: Single-channel configuration required
• Input Type: DC input control required
• Mounting Type: Surface mount only
• Isolation Voltage: Substitutes with equal or higher isolation voltage rating are acceptable
• Current Transfer Ratio (Min): Minimum 100% @ specified current
• Voltage - Output (Max): Must support at least 25V output
• Operating Temperature Range: Must cover or exceed -55°C ~ 100°C
• Vce Saturation (Max): Must not exceed 1V

The substitute parts listed below meet these criteria with variations in isolation voltage, current transfer ratio specifications, and product status.

Parameter Comparison

Engineering Selection Recommendations

H11B1SR2VM (onsemi) is the primary substitute for the obsolete H11B33SD. Both components are manufactured by onsemi and share identical turn-on/turn-off timing characteristics (25µs, 18µs). The H11B1SR2VM is active in production status and available in Tape & Reel packaging. The isolation voltage is lower at 4170Vrms compared to the H11B33SD at 5300Vrms; applications requiring the full 5300Vrms isolation specification cannot use this substitute. The H11B1SR2VM features superior current transfer ratio at 500% @ 1mA and supports higher output current at 150mA. Operating temperature range is -40°C ~ 100°C, which does not extend to -55°C. RoHS3 compliance is confirmed.

4N30SM (Fairchild Semiconductor) provides an alternative from a different manufacturer with 4170Vrms isolation voltage. This part is active in production and available in bulk packaging. Current transfer ratio is specified at 100% @ 10mA, requiring higher input current than the H11B33SD. Output current capability is 150mA. Turn-on/turn-off timing differs significantly at 5µs and 40µs (Max). Operating temperature range is -40°C ~ 100°C.

H11B3SM and H11B3SMT&R (Isocom Components 2004 LTD) are functionally equivalent variants differing only in packaging (Tube versus Tape & Reel). Both are active in production status. These parts feature significantly lower isolation voltage at 7.5Vpk, making them unsuitable for applications requiring high-voltage isolation. Turn-on/turn-off timing is substantially slower at 125µs and 100µs. Operating temperature range extends to -55°C, matching the H11B33SD. RoHS3 compliance is confirmed for both variants.

For applications where 5300Vrms isolation is mandatory, none of the listed substitutes provide equivalent isolation voltage. For applications where lower isolation voltage is acceptable, H11B1SR2VM is recommended as the primary choice due to manufacturer continuity and active production status.

Frequently Asked Questions (FAQ)

Q: Can H11B1SR2VM directly replace H11B33SD in all applications?

A: H11B1SR2VM is functionally compatible for package, output type, and channel configuration. However, isolation voltage is reduced from 5300Vrms to 4170Vrms. Applications requiring the full 5300Vrms isolation specification cannot use this substitute. Operating temperature minimum is -40°C instead of -55°C. Verify your application's isolation and temperature requirements before substitution.

Q: What is the key difference between H11B3SM and H11B3SMT&R?

A: Both parts are identical in electrical and mechanical specifications. H11B3SM is supplied in Tube packaging, while H11B3SMT&R is supplied in Tape & Reel (TR) packaging. Select based on your procurement and assembly process requirements.

Q: Why is 4N30SM listed as a substitute if it has lower isolation voltage?

A: 4N30SM meets the core functional requirements of single-channel Darlington output in 6-SMD surface mount configuration. However, its 4170Vrms isolation voltage is lower than the H11B33SD. This part is listed as a substitute only for applications where the lower isolation voltage is acceptable.

Q: Are all substitutes RoHS compliant?

A: H11B1SR2VM, H11B3SM, and H11B3SMT&R are confirmed RoHS3 compliant. RoHS status for 4N30SM is not provided in the available specifications.

Q: What is the impact of different current transfer ratios on substitution?

A: Current transfer ratio determines the input current required to achieve specified output performance. H11B33SD requires 100% @ 1mA. H11B1SR2VM achieves 500% @ 1mA, requiring less input current for the same output. 4N30SM requires 100% @ 10mA, requiring higher input current. H11B3SM and H11B3SMT&R require 100% @ 1mA, matching the H11B33SD. Verify your circuit's input current capability when selecting substitutes.

Q: Can I use H11B3SM or H11B3SMT&R as substitutes?

A: These parts meet package and output type requirements but feature isolation voltage of only 7.5Vpk, significantly lower than the H11B33SD at 5300Vrms. Use only in applications where high-voltage isolation is not required.