MAX1649CSA Equivalent & Substitute Parts

Part Overview

The MAX1649CSA 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 MAX1649CSA is currently classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design requirements and component procurement. Active alternatives with identical or parametrically equivalent specifications are available to ensure design continuity.

Key Parameters

Parameter	Specification
Topology	Buck
Output Type	Transistor Driver
Function	Step-Down
Output Configuration	Positive
Number of Outputs	1
Output Phases	1
Voltage - Supply (Vcc/Vdd)	3V ~ 16V
Frequency - Switching	Up to 300kHz
Duty Cycle (Max)	96.5%
Synchronous Rectifier	No
Clock Sync	No
Control Features	Enable
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)

Substitute Part Grouping Explanation

Substitute parts for the MAX1649CSA are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution logic is based on the following key parameters that must remain constant:

Topology: Buck
Output Type: Transistor Driver
Function: Step-Down
Output Configuration: Positive
Number of Outputs: 1
Output Phases: 1
Voltage - Supply (Vcc/Vdd): 3V ~ 16V
Frequency - Switching: Up to 300kHz
Duty Cycle (Max): 96.5%
Operating Temperature: 0°C ~ 70°C (TA)
Package / Case: 8-SOIC (0.154", 3.90mm Width)

Parts meeting these criteria are classified as direct manufacturer equivalents or parametrically equivalent alternatives. Differences in product status and compliance certifications do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Parameter	MAX1649CSA	MAX1649CSA+	MAX1651CSA+
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Description	IC REG CTRLR BUCK 8SOIC	IC REG CTRLR BUCK 8SOIC	IC REG CTRLR BUCK 8SOIC
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	Up to 300kHz	Up to 300kHz	Up to 300kHz
Duty Cycle (Max)	96.5%	96.5%	96.5%
Synchronous Rectifier	No	No	No
Clock Sync	No	No	No
Control Features	Enable	Enable	Enable
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	Tube	Tube

Engineering Selection Recommendations

The MAX1649CSA is classified as obsolete and should be replaced with an active equivalent for new designs and ongoing procurement. Two substitute parts are available:

MAX1649CSA+ is the direct manufacturer equivalent with identical base product number (MAX1649). This part maintains full electrical and mechanical compatibility while offering active product status and ROHS3 compliance. This is the primary recommended substitute.

MAX1651CSA+ is a parametrically equivalent alternative with identical electrical specifications and package configuration. The base product number differs (MAX1651 versus MAX1649), but all critical parameters for functional interchangeability remain constant. This part is also active and ROHS3 compliant.

Both substitute parts are suitable for direct replacement in existing designs. Selection between MAX1649CSA+ and MAX1651CSA+ should be based on design documentation requirements and component availability. Both parts are manufactured by Analog Devices Inc./Maxim Integrated and meet current regulatory compliance standards.

Frequently Asked Questions (FAQ)

Q: Can MAX1649CSA+ be used as a direct replacement for MAX1649CSA?

A: Yes. MAX1649CSA+ is the direct manufacturer equivalent with identical electrical and mechanical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance certification.

Q: What is the difference between MAX1649CSA+ and MAX1651CSA+?

A: Both parts are parametrically equivalent with identical electrical specifications and 8-SOIC package configuration. The base product number differs (MAX1649 versus MAX1651), but all critical parameters including topology, output type, voltage supply range, switching frequency, duty cycle, and operating temperature are identical.

Q: Are the substitute parts pin-compatible with the original MAX1649CSA?

A: Yes. All three parts use the 8-SOIC (0.154", 3.90mm Width) package with identical pin configuration, enabling direct PCB-level replacement without layout modifications.

Q: What is the operating temperature range for these parts?

A: All parts operate within 0°C to 70°C (TA) ambient temperature range.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both MAX1649CSA+ and MAX1651CSA+ are ROHS3 compliant. The original MAX1649CSA is RoHS non-compliant.

Q: What is the maximum switching frequency for these buck controller ICs?

A: The maximum switching frequency is 300kHz for all three parts.

Q: Can these parts be used in applications requiring synchronous rectification?

A: No. These parts do not include synchronous rectifier functionality. External rectification components are required for step-down conversion applications.

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