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 surface mount device operates as a transistor driver for step-down topology applications with a single output phase. The part is currently in active production status with 1,069 units available in new original stock. Alternative equivalent parts are necessary to support supply chain flexibility, inventory management, and design redundancy in power management applications requiring buck controller functionality.

Substiute Parts

MAX1651ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1113MAX1651ESA+ 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 for the MAX1651ESA+ is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck regulator controller with step-down positive output configuration
• Output Architecture: Single output, single phase transistor driver
• Electrical Specifications: Voltage supply range 3V ~ 16V, switching frequency up to 300kHz, maximum duty cycle 96.5%
• Thermal Performance: Operating temperature range -40°C ~ 85°C
• Package Compatibility: 8-SOIC surface mount package (0.154", 3.90mm width)
• Regulatory Compliance: ROHS3 compliant, MSL Level 1

The MAX1649ESA+ meets all these criteria as a parametric equivalent, maintaining identical electrical and mechanical specifications while originating from the same manufacturer family.

Parameter Comparison

Engineering Selection Recommendations

Both MAX1651ESA+ and MAX1649ESA+ are active production parts from Analog Devices Inc./Maxim Integrated with full ROHS3 compliance and identical electrical and mechanical specifications. Selection between these parts should be based on:

• Inventory Availability: MAX1651ESA+ has higher stock levels (1,069 units) compared to MAX1649ESA+ (818 units)
• Supply Chain Requirements: Either part satisfies identical design requirements for buck controller applications
• Regulatory Compliance: Both parts meet ROHS3 and MSL Level 1 requirements for standard industrial and commercial applications
• Package Compatibility: Both use 8-SOIC surface mount packaging, ensuring PCB layout and assembly process compatibility

Frequently Asked Questions (FAQ)

Q: Can MAX1649ESA+ be used as a direct replacement for MAX1651ESA+ in existing designs?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, output topology, voltage supply range, switching frequency, duty cycle, operating temperature range, and 8-SOIC package dimensions. No design modifications are required.

Q: Are there any differences in control features or serial interfaces between these parts?

A: No. Both parts feature identical control features (Enable function) and neither includes serial interfaces. Functional behavior is equivalent.

Q: What are the package dimensions for both parts?

A: Both MAX1651ESA+ and MAX1649ESA+ use 8-SOIC packaging with 0.154" width and 3.90mm overall width. PCB footprints are identical.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant with MSL Level 1 rating, suitable for unlimited moisture exposure conditions during storage and handling.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection may be based on current inventory availability or supplier preference, as both maintain identical performance characteristics and compliance certifications.