CS51033GDR8G Equivalent & Substitute Parts

Part Overview

The CS51033GDR8G is a buck regulator positive output step-down DC-DC controller IC manufactured by onsemi in 8-SOIC packaging. This device functions as a transistor driver for step-down voltage conversion applications with a single output phase. The part is currently obsolete, making equivalent substitute components necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence in buck topology, output configuration, and package form factor while meeting the electrical specifications required for step-down DC-DC control applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CS51033GDR8G
Manufacturer	onsemi
Category	Power Management (PMIC)
Description	IC REG CTRLR BUCK 8SOIC
Output Type	Transistor Driver
Function	Step-Down
Output Configuration	Positive
Topology	Buck
Number of Outputs	1
Output Phases	1
Voltage - Supply (Vcc/Vdd)	3V ~ 16V
Frequency - Switching	200kHz
Duty Cycle (Max)	83.3%
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CS51033GDR8G are qualified based on the following critical parameters that determine functional equivalence:

Topology & Output Configuration: All substitutes must implement buck topology with positive output configuration and single-output, single-phase architecture to maintain functional compatibility with existing circuit designs.

Package & Mounting: All substitutes must use 8-SOIC surface mount packaging (0.154", 3.90mm width) to ensure mechanical and electrical compatibility with PCB layouts designed for the original part.

Electrical Specifications: All substitutes must support the supply voltage range of 3V to 16V and operate within the 0°C to 70°C temperature range. The substitutes maintain compatibility with the original design specifications while offering enhanced performance characteristics in switching frequency and duty cycle capabilities.

Output Type & Control: All substitutes function as transistor drivers for step-down DC-DC control, maintaining the same functional role in power management circuits.

The substitute parts MAX1649CSA+T and MAX1651CSA+T meet all substitution criteria and are classified as parametric equivalents suitable for direct replacement in applications requiring buck regulator controller functionality.

Parameter Comparison

Parameter	CS51033GDR8G	MAX1649CSA+T	MAX1651CSA+T
Manufacturer	onsemi	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Output Type	Transistor Driver	Transistor Driver	Transistor Driver
Function	Step-Down	Step-Down	Step-Down
Output Configuration	Positive	Positive	Positive
Topology	Buck	Buck	Buck
Number of Outputs	1	1	1
Output Phases	1	1	1
Voltage - Supply (Vcc/Vdd)	3V ~ 16V	3V ~ 16V	3V ~ 16V
Frequency - Switching	200kHz	Up to 300kHz	Up to 300kHz
Duty Cycle (Max)	83.3%	96.5%	96.5%
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

The CS51033GDR8G is obsolete and no longer available from the original manufacturer. Both MAX1649CSA+T and MAX1651CSA+T are active products from Analog Devices Inc./Maxim Integrated and serve as direct functional replacements.

MAX1649CSA+T and MAX1651CSA+T are recommended as primary substitutes. Both parts are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain reliability. These devices maintain full compatibility with the original CS51033GDR8G in terms of topology, package, and core electrical specifications. The enhanced switching frequency capability (up to 300kHz versus 200kHz) and higher maximum duty cycle (96.5% versus 83.3%) provide improved performance margins in step-down DC-DC applications.

Selection between MAX1649CSA+T and MAX1651CSA+T should be based on specific application requirements and design validation. Both parts are electrically equivalent for the purposes of substituting the obsolete CS51033GDR8G.

Frequently Asked Questions (FAQ)

Q: Can MAX1649CSA+T and MAX1651CSA+T be used interchangeably with CS51033GDR8G?

A: Yes. Both substitute parts maintain functional equivalence in buck topology, single-phase output configuration, 8-SOIC package form factor, and core electrical specifications including 3V to 16V supply voltage range and 0°C to 70°C operating temperature. The substitutes are pin-compatible and functionally compatible for step-down DC-DC controller applications.

Q: What are the key differences between the substitute parts and the original?

A: The substitute parts offer enhanced performance characteristics. MAX1649CSA+T and MAX1651CSA+T support switching frequencies up to 300kHz compared to the original 200kHz specification, and maximum duty cycle of 96.5% versus 83.3%. Both substitutes are active products with ROHS3 compliance, whereas the original CS51033GDR8G is obsolete.

Q: Are there differences between MAX1649CSA+T and MAX1651CSA+T?

A: Both parts are parametrically equivalent for substituting the CS51033GDR8G. Selection should be based on specific application requirements and design validation protocols established for your organization.

Q: What packaging format is used for these substitute parts?

A: All parts, including the original and substitutes, use 8-SOIC surface mount packaging with 0.154" (3.90mm) width. This ensures mechanical compatibility with existing PCB layouts designed for the CS51033GDR8G.

Q: Are the substitute parts RoHS compliant?

A: Yes. MAX1649CSA+T and MAX1651CSA+T are ROHS3 compliant. The original CS51033GDR8G RoHS status is not specified in the provided data.

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