MAX1651ESA Equivalent & Substitute Parts

Part Overview

The MAX1651ESA is a buck regulator positive output step-down DC-DC controller IC manufactured by Analog Devices Inc./Maxim Integrated. This component functions as a transistor driver for step-down voltage conversion applications with a single output phase. The MAX1651ESA is currently classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. Active substitute parts maintain identical electrical and mechanical specifications while offering current product status and improved compliance certifications.

Substiute Parts

MAX1651ESA

Analog Devices Inc./Maxim IntegratedIn Stock: 11200MAX1651ESA Datasheet

Current PartRFQ

MAX1651ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1113MAX1651ESA+ Datasheet

DirectRFQ

MAX1649ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 896MAX1649ESA+ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MAX1651ESA is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Critical Matching Parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Voltage - Supply (Vcc/Vdd): 3V ~ 16V
• Frequency - Switching: Up to 300kHz
• Duty Cycle (Max): 96.5%
• Output Type: Transistor Driver
• Function: Step-Down
• Output Configuration: Positive
• Topology: Buck
• Number of Outputs: 1
• Output Phases: 1
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Surface Mount

The MAX1651ESA+ and MAX1649ESA+ meet all electrical and mechanical parameter requirements for direct substitution. Both parts are manufactured by Analog Devices Inc./Maxim Integrated and maintain identical functional specifications. The primary distinction between these substitutes and the main part is product status and compliance certification level.

Parameter Comparison

Engineering Selection Recommendations

MAX1651ESA+ (Direct Manufacturer Upgrade)

The MAX1651ESA+ is the direct active equivalent of the MAX1651ESA. This part maintains identical electrical and mechanical specifications while offering active product status. The MAX1651ESA+ is ROHS3 compliant, addressing regulatory requirements for new designs and production environments subject to RoHS directives. Selection of MAX1651ESA+ is appropriate for applications requiring direct form-factor and functional compatibility with established designs using the obsolete MAX1651ESA.

MAX1649ESA+ (Parametric Equivalent)

The MAX1649ESA+ is a parametric equivalent offering identical electrical performance and mechanical compatibility. This part is also ROHS3 compliant and maintains active product status. The MAX1649ESA+ differs from MAX1651ESA only in base product number designation while maintaining all critical functional parameters. Selection of MAX1649ESA+ is appropriate when supply chain considerations or inventory management favor this alternative within the same electrical specification class.

Both substitute parts provide improved compliance certifications compared to the obsolete MAX1651ESA, making them suitable for new designs and production applications requiring current component status.

Frequently Asked Questions (FAQ)

Q: Can MAX1651ESA+ be used as a direct replacement for MAX1651ESA?

A: Yes. The MAX1651ESA+ maintains identical electrical specifications, package configuration, and functional characteristics. The primary difference is product status (active versus obsolete) and RoHS3 compliance certification.

Q: What is the difference between MAX1651ESA+ and MAX1649ESA+?

A: Both parts are parametric equivalents with identical electrical performance and mechanical specifications. The distinction is the base product number (MAX1651 versus MAX1649). All critical parameters including supply voltage range, switching frequency, duty cycle, package type, and operating temperature are equivalent.

Q: Are the substitute parts available in the same 8-SOIC package?

A: Yes. Both MAX1651ESA+ and MAX1649ESA+ are packaged in 8-SOIC (0.154", 3.90mm Width), identical to the original MAX1651ESA.

Q: Do the substitute parts support the same operating temperature range?

A: Yes. All three parts operate across -40°C to 85°C (TA), maintaining identical thermal specifications.

Q: What is the significance of ROHS3 compliance on the substitute parts?

A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances directives. The substitute parts MAX1651ESA+ and MAX1649ESA+ meet these regulatory requirements, whereas the original MAX1651ESA is RoHS non-compliant. This is relevant for applications subject to RoHS regulations or customer requirements.

Q: Can both substitute parts be used interchangeably in the same application?

A: Yes. Both MAX1651ESA+ and MAX1649ESA+ meet all electrical and mechanical parameter requirements for substitution. Selection between them may be based on supply chain availability, packaging preferences (Tube), or inventory management considerations.