H11B255S Equivalent & Substitute Parts

Part Overview

The H11B255S is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 5300Vrms isolation voltage in a 6-SMD surface mount package. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations where equivalent functionality is required.

Substiute Parts

H11B255S

onsemiIn Stock: 949H11B255S Datasheet

Current PartRFQ

H11B1SM

onsemiIn Stock: 12296H11B1SM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the H11B255S is determined by the following critical parameters:

• Isolation Voltage: The substitute must maintain isolation voltage at or above the application requirement. The H11B255S provides 5300Vrms isolation.
• Output Configuration: Both parts must feature Darlington output with base connection for circuit compatibility.
• Package Type: Both parts must use 6-SMD, Gull Wing surface mount packaging for mechanical and electrical compatibility.
• Input Type: Both parts must accept DC input.
• Operating Temperature Range: The substitute must cover the required operating conditions.
• Vce Saturation: Maximum saturation voltage must be compatible with circuit design specifications.

The H11B1SM qualifies as a substitute based on matching output type, package configuration, and input characteristics. However, the isolation voltage is lower (4170Vrms versus 5300Vrms), which may limit its use in applications requiring the full isolation specification of the original part.

Parameter Comparison

Engineering Selection Recommendations

The H11B1SM is the identified substitute for the obsolete H11B255S. Selection should be based on the following factors:

Product Status: The H11B1SM is active and in production, ensuring long-term availability and supply chain continuity compared to the obsolete H11B255S.

Compliance: The H11B1SM carries RoHS3 compliance certification, whereas the H11B255S compliance status is not specified. Both parts are REACH Unaffected and classified as EAR99.

Isolation Voltage Consideration: The H11B1SM provides 4170Vrms isolation versus the H11B255S at 5300Vrms. Applications requiring the full 5300Vrms isolation specification may not be suitable for direct substitution with the H11B1SM.

Output Voltage and Current: The H11B1SM has a maximum output voltage of 30V and specified output current of 150mA, compared to the H11B255S at 55V maximum output. Circuit designs operating above 30V output voltage require evaluation before substitution.

Temperature Range: The H11B1SM operates from -40°C to 100°C, whereas the H11B255S extends to -55°C minimum. Applications requiring operation below -40°C cannot use the H11B1SM as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can the H11B1SM directly replace the H11B255S in all applications?

A: Direct substitution is not universal. The H11B1SM has lower isolation voltage (4170Vrms versus 5300Vrms) and lower maximum output voltage (30V versus 55V). Applications must be evaluated against these reduced specifications before substitution is confirmed.

Q: What is the primary advantage of using the H11B1SM over the H11B255S?

A: The H11B1SM is an active product with current manufacturing support, whereas the H11B255S is obsolete. The H11B1SM also carries RoHS3 compliance certification.

Q: Are the package configurations identical between these parts?

A: Yes. Both the H11B255S and H11B1SM use 6-SMD, Gull Wing surface mount packaging, ensuring mechanical compatibility on PCB layouts.

Q: What are the key electrical differences between these optoisolators?

A: The primary differences are isolation voltage (5300Vrms versus 4170Vrms), maximum output voltage (55V versus 30V), and current transfer ratio specifications (100% @ 10mA versus 500% @ 1mA). Operating temperature range also differs, with the H11B255S extending to -55°C minimum.

Q: Is the H11B1SM suitable for high-voltage isolation applications?

A: The H11B1SM provides 4170Vrms isolation, which is suitable for many industrial applications. However, applications specifically requiring 5300Vrms isolation must use a part with equivalent or higher isolation voltage rating.

Q: What should be verified before implementing the H11B1SM as a substitute?

A: Verify that the application requirements do not exceed the H11B1SM specifications for isolation voltage (4170Vrms), maximum output voltage (30V), output current (150mA), and minimum operating temperature (-40°C).