ISL6520BCBZ Equivalent & Substitute Parts

Part Overview

The ISL6520BCBZ is a Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Renesas Electronics Corporation in 8-SOIC packaging. This device functions as a transistor driver for step-down voltage conversion with a single output phase and 100% maximum duty cycle. The product is currently obsolete, making identification of equivalent substitute parts essential for ongoing system support and component procurement.

Substiute Parts

ISL6520BCBZ

Renesas Electronics CorporationIn Stock: 1705ISL6520BCBZ Datasheet

Current PartRFQ

ISL6431CB

IntersilIn Stock: 2152ISL6431CB Datasheet

Parametric EquivalentRFQ

ISL6520ACBZ

IntersilIn Stock: 1311ISL6520ACBZ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISL6520BCBZ are qualified based on the following critical parameters that must match or be compatible:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) — ensures PCB layout compatibility
• Output Type: Transistor Driver — maintains functional equivalence
• Function: Step-Down — preserves voltage conversion direction
• Output Configuration: Positive — ensures output polarity compatibility
• Topology: Buck — confirms regulator architecture
• Number of Outputs: 1 — matches single-output requirement
• Output Phases: 1 — maintains phase configuration
• Voltage - Supply (Vcc/Vdd): 4.5V ~ 5.5V — ensures supply voltage compatibility
• Frequency - Switching: 300kHz — maintains switching frequency
• Duty Cycle (Max): 100% — preserves maximum duty cycle capability
• Synchronous Rectifier: Yes — confirms synchronous operation
• Operating Temperature: 0°C ~ 70°C (TA) — matches thermal operating range
• Mounting Type: Surface Mount — ensures assembly compatibility

The identified substitute parts meet all these critical parameters and are therefore functionally and mechanically equivalent to the ISL6520BCBZ.

Parameter Comparison

Engineering Selection Recommendations

ISL6520ACBZ (Intersil) is the primary substitute for the ISL6520BCBZ. This part maintains identical electrical and mechanical parameters while offering the advantage of Active product status, ensuring continued availability and manufacturer support. The ISL6520ACBZ is sourced from Intersil and shares the same base product number series, confirming functional equivalence.

ISL6431CB (Intersil) is a secondary substitute that meets all critical electrical and mechanical parameters. However, this part carries RoHS non-compliant status, which may present regulatory constraints in applications requiring RoHS3 compliance. The ISL6431CB is also obsolete, similar to the original ISL6520BCBZ.

For new designs or applications requiring regulatory compliance, ISL6520ACBZ is the recommended selection. For legacy system maintenance where RoHS compliance is not a constraint, ISL6431CB remains a viable alternative.

Frequently Asked Questions (FAQ)

Q: Can ISL6520ACBZ be used as a direct replacement for ISL6520BCBZ?

A: Yes. Both parts share identical electrical specifications, switching frequency, duty cycle capability, supply voltage range, and 8-SOIC packaging. The parts are pin-compatible and functionally equivalent for buck regulator controller applications.

Q: What is the difference between ISL6520BCBZ and ISL6520ACBZ?

A: The primary difference is product status. ISL6520BCBZ is obsolete, while ISL6520ACBZ is active. Both parts are manufactured by Intersil and share the same base product number (ISL6520). Electrical and mechanical specifications are identical.

Q: Is ISL6431CB suitable for applications requiring RoHS compliance?

A: No. ISL6431CB is RoHS non-compliant, making it unsuitable for applications or markets requiring RoHS3 certification. ISL6520ACBZ is the appropriate choice for RoHS-compliant designs.

Q: Are all substitute parts available in the same packaging?

A: Yes. ISL6520BCBZ, ISL6431CB, and ISL6520ACBZ are all supplied in 8-SOIC (0.154", 3.90mm Width) packaging, ensuring PCB layout and assembly compatibility without design modifications.

Q: What is the switching frequency of these buck controller ICs?

A: All three parts operate at 300kHz switching frequency, maintaining consistent power conversion efficiency and thermal characteristics across substitutions.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the design does not impose RoHS compliance requirements. For designs currently using ISL6520BCBZ, both ISL6431CB and ISL6520ACBZ are direct substitutes without circuit modifications. For new designs, ISL6520ACBZ is preferred due to active product status.