MAX1771C/D Equivalent & Substitute Parts

Part Overview

The MAX1771C/D is a Boost, Buck-Boost Regulator Positive Output Step-Up, Step-Up/Step-Down DC-DC Controller IC in Die package form. This component functions as a transistor driver for power management applications requiring flexible voltage conversion topologies. The part is currently classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Die-packaged versions require integration into hybrid or custom module designs, whereas packaged alternatives enable direct circuit board implementation.

Substiute Parts

MAX1771C/D

Analog Devices Inc./Maxim IntegratedIn Stock: 809MAX1771C/D Datasheet

Current PartRFQ

MAX1771CSA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 17074MAX1771CSA+T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX1771C/D is determined by functional equivalence across the following critical parameters:

• Base Product Number: Both parts share the MAX1771 base designation, confirming identical core controller architecture and pin functionality
• Function & Topology: Both implement Step-Up and Step-Up/Step-Down (Buck-Boost) topologies with identical output configuration (Positive, single output)
• Output Type: Both function as Transistor Drivers for external power stage control
• Supply Voltage Range: Both operate across 3V ~ 16.5V, ensuring compatible input conditions
• Switching Frequency: Both support operation up to 300kHz
• Operating Temperature: Both rated for 0°C ~ 70°C (TA)
• Control Features: Both include Enable control functionality

The primary distinction is packaging: the MAX1771C/D is supplied as a bare Die, while the MAX1771CSA+T is packaged in 8-SOIC form factor, enabling direct surface mount implementation on printed circuit boards.

Parameter Comparison

Engineering Selection Recommendations

MAX1771CSA+T is the direct functional equivalent for applications currently using or requiring MAX1771C/D functionality.

Product Status Consideration: The MAX1771C/D is Obsolete. The MAX1771CSA+T is Active and in current production with 17,041 pieces in stock, ensuring long-term availability and supply chain stability.

Compliance Advantage: The MAX1771CSA+T is ROHS3 Compliant and REACH Unaffected, meeting modern regulatory requirements. The MAX1771C/D is RoHS non-compliant, which may restrict use in regulated markets or OEM applications with environmental compliance mandates.

Packaging Consideration: Selection between these parts depends on implementation method. The MAX1771C/D requires hybrid integration or custom module assembly. The MAX1771CSA+T in 8-SOIC package enables direct surface mount assembly on standard PCBs, reducing design complexity and manufacturing cost.

Performance Note: The MAX1771CSA+T supports a maximum duty cycle of 92% compared to 50% for the MAX1771C/D, providing greater flexibility in buck-boost converter designs without functional limitation.

Frequently Asked Questions (FAQ)

Q: Can MAX1771CSA+T directly replace MAX1771C/D in existing designs?

A: Functionally, yes. Both parts share identical core controller architecture, supply voltage range, switching frequency capability, and control features. The primary difference is packaging: MAX1771C/D is a bare die requiring hybrid assembly, while MAX1771CSA+T is an 8-SOIC packaged component for direct PCB mounting. Circuit board layout and assembly process will differ accordingly.

Q: What is the significance of the higher duty cycle specification in MAX1771CSA+T?

A: The MAX1771CSA+T supports 92% maximum duty cycle versus 50% for MAX1771C/D. This expanded operating range provides design flexibility for buck-boost converter topologies, particularly in applications requiring extended step-down conversion ratios. Existing designs operating within 50% duty cycle will function identically with either part.

Q: Why is RoHS compliance important for this substitution?

A: RoHS3 compliance (MAX1771CSA+T) is required for sale and use in European Union markets and by many OEMs globally. The MAX1771C/D's non-compliant status may restrict procurement for new designs or regulated applications. For legacy system maintenance, compliance requirements depend on end-market regulations and customer specifications.

Q: Are there pin-to-pin compatibility considerations?

A: Both parts implement the MAX1771 controller architecture with identical functional pin assignments. The 8-SOIC package of MAX1771CSA+T contains all necessary pins for boost and buck-boost operation. PCB layout and external component placement will require redesign to accommodate the different package form factor.

Q: What inventory status should influence part selection?

A: MAX1771CSA+T has 17,041 pieces in active stock with Active product status, ensuring availability for current and future production. MAX1771C/D with 754 pieces in stock and Obsolete status presents supply risk for ongoing or new applications. For production continuity, MAX1771CSA+T is the recommended selection.