MAX1649ESA Equivalent & Substitute Parts

Part Overview

The MAX1649ESA 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 MAX1649ESA is currently classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement requirements. Active alternatives with identical or compatible electrical and mechanical specifications are available to ensure design continuity.

Substiute Parts

MAX1649ESA

Analog Devices Inc./Maxim IntegratedIn Stock: 2811MAX1649ESA Datasheet

Current PartRFQ

MAX1649ESA+

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

DirectRFQ

MAX1651ESA+

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MAX1649ESA are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

• Identical package and case specification: 8-SOIC (0.154", 3.90mm Width)
• Matching functional topology: Buck regulator, step-down configuration
• Identical output configuration: Single output, positive polarity, transistor driver output type
• Matching electrical specifications: Supply voltage range 3V ~ 16V, switching frequency up to 300kHz, duty cycle maximum 96.5%
• Identical control features: Enable function
• Matching operating temperature range: -40°C ~ 85°C
• Identical moisture sensitivity level: MSL 1 (Unlimited)
• Matching regulatory status: REACH Unaffected, ECCN EAR99

Two substitute parts meet these criteria: MAX1649ESA+ (direct manufacturer equivalent) and MAX1651ESA+ (parametric equivalent). Both parts maintain full electrical and mechanical compatibility with the obsolete MAX1649ESA.

Parameter Comparison

Engineering Selection Recommendations

The MAX1649ESA+ is the direct manufacturer substitute, maintaining identical part number base (MAX1649) with active product status and ROHS3 compliance. This part is the primary selection for new designs and obsolescence mitigation.

The MAX1651ESA+ is a parametric equivalent offering identical electrical and mechanical specifications with active product status and ROHS3 compliance. This part provides an alternative source with equivalent functional performance.

Both substitute parts offer improved regulatory compliance compared to the obsolete MAX1649ESA, with ROHS3 certification replacing the non-compliant status of the original part. Selection between MAX1649ESA+ and MAX1651ESA+ depends on procurement availability and design documentation requirements, as both parts deliver identical electrical performance within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can MAX1649ESA+ be used as a direct replacement for MAX1649ESA?

A: Yes. The MAX1649ESA+ maintains identical electrical specifications, package configuration, and functional topology. The primary difference is active product status and ROHS3 compliance versus the obsolete, non-compliant status of the original MAX1649ESA.

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

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The base product number differs (MAX1649 versus MAX1651), but all critical parameters including supply voltage range, switching frequency, duty cycle, package type, and operating temperature are identical. Selection depends on procurement availability.

Q: Are the substitute parts pin-compatible with MAX1649ESA?

A: Yes. Both MAX1649ESA+ and MAX1651ESA+ use the identical 8-SOIC package configuration (0.154", 3.90mm Width) with matching pin assignments for surface mount applications.

Q: What is the impact of RoHS compliance differences?

A: The MAX1649ESA is RoHS non-compliant, while both substitute parts (MAX1649ESA+ and MAX1651ESA+) are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the substitute parts provide regulatory compliance without electrical or mechanical design changes.

Q: Are there any thermal or performance differences between the substitute parts?

A: No. Both substitute parts maintain identical operating temperature range (-40°C ~ 85°C), moisture sensitivity level (MSL 1), and all electrical performance specifications including switching frequency, duty cycle, and supply voltage range.

Q: What packaging options are available for the substitute parts?

A: MAX1649ESA+ and MAX1651ESA+ are supplied in tube packaging, compared to the original MAX1649ESA which had unspecified packaging. Both maintain the same 8-SOIC component package for PCB assembly.