IR21571STRPBF Equivalent & Substitute Parts

Part Overview

The IR21571STRPBF is a ballast controller IC manufactured by Infineon Technologies, designed for fluorescent lamp ballast applications operating in the 45.5kHz to 50.5kHz frequency range. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The ballast controller manages the high-frequency switching required for efficient lamp ignition and operation in electronic ballast circuits.

Substiute Parts

IR21571STRPBF

Infineon TechnologiesIn Stock: 7076IR21571STRPBF Datasheet

Current PartRFQ

IR2156STRPBF

Infineon TechnologiesIn Stock: 17150IR2156STRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IR21571STRPBF is determined by the following critical parameters:

Functional Compatibility Criteria:

• Ballast controller type and application class
• Operating frequency range overlap or compatibility
• Supply voltage range compatibility (10.5V ~ 16.5V maintained)
• Operating temperature range coverage
• Package form factor and pin count

Compliance & Certification Criteria:

• RoHS3 compliance status
• REACH compliance status
• Moisture sensitivity level (MSL)

The IR2156STRPBF qualifies as a manufacturer-recommended substitute based on shared functional classification, overlapping supply voltage specifications, compatible operating temperature ranges, and identical compliance certifications. Both components are ballast controller ICs from Infineon Technologies with ROHS3 compliance and MSL 3 ratings.

Parameter Comparison

Engineering Selection Recommendations

The IR2156STRPBF is the manufacturer-recommended substitute for the obsolete IR21571STRPBF. Selection of this substitute is supported by the following factors:

Voltage Compatibility: Both components operate within the identical 10.5V to 16.5V supply voltage range, ensuring direct compatibility with existing power supply designs.

Compliance Alignment: Both parts maintain ROHS3 compliance and identical MSL 3 ratings, satisfying regulatory and environmental requirements without modification to assembly or storage procedures.

Active Product Status: The IR2156STRPBF maintains active product status with Infineon Technologies, ensuring ongoing availability, technical support, and supply chain continuity compared to the obsolete IR21571STRPBF.

Temperature Range Consideration: The IR2156STRPBF operates across -25°C to 125°C, which covers the upper portion of the IR21571STRPBF range (-40°C to 125°C). Applications requiring operation below -25°C require evaluation of alternative solutions.

Package and Mounting: Both components use surface mount technology with compatible SOIC package widths (3.90mm). The IR2156STRPBF uses 14-SOIC versus the 16-SOIC of the main part, requiring PCB layout verification for pin compatibility and signal routing.

Frequently Asked Questions (FAQ)

Q: Can the IR2156STRPBF directly replace the IR21571STRPBF without PCB modifications?

A: Package differences exist between the two components. The IR21571STRPBF uses 16-SOIC packaging while the IR2156STRPBF uses 14-SOIC packaging. PCB layout modifications are required to accommodate the different pin counts and footprints. Pin function mapping must be verified against both datasheets before implementation.

Q: What is the frequency range difference between these ballast controllers?

A: The IR21571STRPBF operates at 45.5kHz to 50.5kHz, while the IR2156STRPBF operates at 36kHz to 44kHz. These frequency ranges do not overlap. System design must accommodate the lower frequency range of the substitute component, which may affect transformer and resonant circuit design parameters.

Q: Are both components suitable for low-temperature applications below -25°C?

A: The IR21571STRPBF supports operation down to -40°C, while the IR2156STRPBF minimum operating temperature is -25°C. For applications requiring operation below -25°C, the IR2156STRPBF does not meet the temperature specification. Alternative substitute parts must be evaluated for such applications.

Q: What is the supply current difference and does it affect circuit design?

A: The IR21571STRPBF draws 5.5 mA supply current while the IR2156STRPBF draws 10 mA. The increased current consumption of the substitute requires verification that the power supply design can deliver the additional current without voltage regulation issues or thermal concerns.

Q: Are both components RoHS compliant?

A: Yes, both the IR21571STRPBF and IR2156STRPBF are ROHS3 compliant with identical MSL 3 ratings. No changes to assembly, storage, or handling procedures are required when transitioning between these components.