CS5171EDR8 Equivalent & Substitute Parts

Part Overview

The CS5171EDR8 is a multi-configuration adjustable switching regulator IC from onsemi, designed for buck, boost, flyback, forward converter, and SEPIC topologies. It delivers 1.5A output current with adjustable positive or negative output configuration and operates across a 2.7V to 30V input range. The CS5171EDR8 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

CS5171EDR8

onsemiIn Stock: 1109CS5171EDR8 Datasheet

Current PartRFQ

CS5171EDR8G

onsemiIn Stock: 39108CS5171EDR8G Datasheet

DirectRFQ

CS5171GDR8G

onsemiIn Stock: 25411CS5171GDR8G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CS5171EDR8 is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitutes:

Critical Matching Parameters:

• Identical topology support (Buck, Boost, Flyback, Forward Converter, SEPIC)
• Identical output configuration (Positive or Negative adjustable)
• Matching input voltage range (2.7V to 30V minimum)
• Matching output voltage range (1.28V to 40V minimum)
• Matching output current rating (1.5A Switch)
• Identical switching frequency (280kHz)
• Identical package type (8-SOIC)
• Identical pin configuration and functional compatibility

Identified Substitutes:

• CS5171EDR8G (Active status, Tape & Reel packaging)
• CS5171GDR8G (Last Time Buy status, Tape & Reel packaging)

Both substitutes maintain full electrical and mechanical compatibility with the original CS5171EDR8 while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

CS5171EDR8G (Recommended Primary Substitute)

The CS5171EDR8G is the preferred substitute for the obsolete CS5171EDR8. It maintains identical electrical specifications and package configuration while offering Active product status, ensuring long-term availability and supply chain stability. The CS5171EDR8G achieves ROHS3 compliance, meeting modern regulatory requirements. Tape & Reel packaging supports automated assembly processes. This part is suitable for new designs and production transitions from the obsolete CS5171EDR8.

CS5171GDR8G (Secondary Substitute)

The CS5171GDR8G provides full electrical and mechanical compatibility with the CS5171EDR8 and carries ROHS3 compliance. However, its Last Time Buy status indicates limited future availability. The operating temperature range is restricted to 0°C ~ 125°C (TJ), compared to the -40°C ~ 125°C range of the primary substitute. This part is appropriate for applications with non-critical temperature requirements and where immediate procurement is feasible.

Compliance Considerations

Both substitute parts achieve ROHS3 compliance, addressing regulatory requirements absent in the original CS5171EDR8. Selection between CS5171EDR8G and CS5171GDR8G should prioritize product status and long-term supply availability for production applications.

Frequently Asked Questions (FAQ)

Q: Can CS5171EDR8G directly replace CS5171EDR8 in existing designs?

A: Yes. The CS5171EDR8G maintains identical electrical specifications, output configuration, switching frequency, and 8-SOIC package pinout. No circuit modifications are required for direct substitution.

Q: What is the difference between CS5171EDR8G and CS5171GDR8G?

A: Both parts are electrically equivalent with identical topologies, output ratings, and switching characteristics. The primary differences are product status (Active vs. Last Time Buy) and operating temperature range. CS5171EDR8G supports -40°C ~ 125°C, while CS5171GDR8G supports 0°C ~ 125°C.

Q: Why is the CS5171EDR8 classified as obsolete?

A: The CS5171EDR8 is no longer in active production. The CS5171EDR8G and CS5171GDR8G represent the current product line for this switching regulator topology.

Q: Are there packaging differences between the substitutes?

A: The CS5171EDR8 is supplied in bulk packaging, while both CS5171EDR8G and CS5171GDR8G are supplied in Tape & Reel (TR) format. The physical package type (8-SOIC) and pin configuration remain identical.

Q: Do the substitutes meet RoHS requirements?

A: Yes. Both CS5171EDR8G and CS5171GDR8G are ROHS3 compliant. The original CS5171EDR8 is RoHS non-compliant.

Q: Which substitute should be selected for new production designs?

A: CS5171EDR8G is recommended for new designs due to its Active product status, ensuring sustained availability and supply chain support.