CS5171GD8G Equivalent & Substitute Parts

Part Overview

The CS5171GD8G is a multi-configuration adjustable switching regulator IC from onsemi, designed for buck, boost, flyback, forward converter, and SEPIC topologies. It supports positive or negative output configurations with a 1.5A switch current rating and operates across a 2.7V to 30V input range. The device is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Power Management (PMIC)
Function	Step-Up, Step-Down, Step-Up/Step-Down
Topology	Buck, Boost, Flyback, Forward Converter, SEPIC
Output Configuration	Positive or Negative
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	2.7V
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.28V
Voltage - Output (Max)	40V (Switch)
Current - Output	1.5A (Switch)
Frequency - Switching	280kHz
Synchronous Rectifier	No
Operating Temperature	0°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CS5171GD8G is determined by strict equivalence across the following critical parameters:

Topology and Function: Buck, Boost, Flyback, Forward Converter, SEPIC capability with Step-Up, Step-Down, Step-Up/Step-Down functionality
Output Configuration: Positive or Negative adjustable output
Electrical Specifications: Input voltage range 2.7V to 30V, output voltage range 1.28V to 40V, 1.5A switch current, 280kHz switching frequency
Package: 8-SOIC (0.154", 3.90mm Width) surface mount
Thermal Range: 0°C to 125°C operating temperature
Compliance: MSL 1 (Unlimited), REACH Unaffected, ECCN EAR99

The CS5171GDR8G qualifies as a direct substitute based on identical electrical and mechanical specifications. The primary difference is packaging format (Tape & Reel versus bulk) and product status classification.

Parameter Comparison

Parameter	CS5171GD8G	CS5171GDR8G
Manufacturer	onsemi	onsemi
Function	Step-Up, Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down
Topology	Buck, Boost, Flyback, Forward Converter, SEPIC	Buck, Boost, Flyback, Forward Converter, SEPIC
Output Configuration	Positive or Negative	Positive or Negative
Output Type	Adjustable	Adjustable
Number of Outputs	1	1
Voltage - Input (Min)	2.7V	2.7V
Voltage - Input (Max)	30V	30V
Voltage - Output (Min/Fixed)	1.28V	1.28V
Voltage - Output (Max)	40V (Switch)	40V (Switch)
Current - Output	1.5A (Switch)	1.5A (Switch)
Frequency - Switching	280kHz	280kHz
Synchronous Rectifier	No	No
Operating Temperature	0°C ~ 125°C (TJ)	0°C ~ 125°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount
MSL	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
Product Status	Obsolete	Last Time Buy
Packaging Format	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

The CS5171GDR8G is a direct electrical and mechanical equivalent to the CS5171GD8G. Both devices share identical functional specifications, electrical performance parameters, and package geometry. The CS5171GDR8G carries Last Time Buy status, indicating limited future availability, whereas the CS5171GD8G is classified as obsolete.

Selection between these parts should be based on:

Packaging Requirements: The CS5171GDR8G is supplied in Tape & Reel format, suitable for automated assembly processes. The CS5171GD8G is supplied in bulk packaging.
Compliance: Both parts meet REACH Unaffected and ECCN EAR99 classifications, with identical MSL ratings.
Availability: The CS5171GDR8G currently has higher inventory availability (25,400 pcs) compared to the CS5171GD8G (2,390 pcs).

For new designs or production continuity, the CS5171GDR8G is the preferred selection due to superior availability and Last Time Buy status, which provides a defined procurement window.

Frequently Asked Questions (FAQ)

Q: Can the CS5171GDR8G replace the CS5171GD8G in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The primary difference is packaging format (Tape & Reel versus bulk) and product lifecycle status. No circuit modifications are required.

Q: What is the difference between the packaging formats?

A: The CS5171GD8G is supplied in bulk packaging, while the CS5171GDR8G is supplied in Tape & Reel (TR) format. Tape & Reel packaging is optimized for automated pick-and-place assembly, whereas bulk packaging is suitable for manual handling or lower-volume applications.

Q: Are there any compliance or certification differences?

A: No. Both parts carry identical REACH Unaffected status, ECCN EAR99 classification, and MSL 1 (Unlimited) ratings. Compliance requirements are met equally by both devices.

Q: Why is the CS5171GD8G classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The CS5171GDR8G, classified as Last Time Buy, represents the final procurement opportunity for this product line before complete discontinuation.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by equivalence in topology (Buck, Boost, Flyback, Forward Converter, SEPIC), output configuration (Positive or Negative adjustable), electrical specifications (2.7V to 30V input, 1.28V to 40V output, 1.5A switch current, 280kHz switching frequency), package type (8-SOIC), and thermal operating range (0°C to 125°C).

Q: Is the 8-SOIC package footprint identical between both parts?

A: Yes. Both parts use the 8-SOIC (0.154", 3.90mm Width) package with identical pin configuration and PCB footprint. Direct board-level substitution is possible without layout modifications.

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