MAX741UCPP Equivalent & Substitute Parts

Part Overview

The MAX741UCPP is a Buck/Boost DC-DC controller IC manufactured by Analog Devices Inc./Maxim Integrated, designed for applications requiring positive or negative output voltage regulation. This device operates as a step-up/step-down regulator controller with a single output phase and transistor driver output type. The MAX741UCPP is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

MAX741UCPP

Analog Devices Inc./Maxim IntegratedIn Stock: 2280MAX741UCPP Datasheet

Current PartRFQ

MAX668EUB+

Analog Devices Inc./Maxim IntegratedIn Stock: 1173MAX668EUB+ Datasheet

MFR RecommendedRFQ

MAX669EUB+

Analog Devices Inc./Maxim IntegratedIn Stock: 1240MAX669EUB+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MAX741UCPP are identified based on functional equivalence within the allowed electrical and mechanical parameters for DC-DC controller ICs. The substitution logic is based on the following criteria:

Functional Compatibility Parameters:

• Output Type: Transistor Driver (maintained across all substitutes)
• Number of Outputs: 1 (maintained across all substitutes)
• Output Phases: 1 (maintained across all substitutes)
• Clock Sync capability: Yes (maintained across all substitutes)
• Manufacturer: Analog Devices Inc./Maxim Integrated (same manufacturer ecosystem)

Topology Considerations: The MAX741UCPP supports Buck and Boost topologies with positive or negative output configuration. Substitute parts (MAX668EUB+ and MAX669EUB+) support Boost, Flyback, and SEPIC topologies with positive and isolation-capable output configurations. These topologies provide functional overlap in step-up and step-down regulation capabilities.

Electrical Parameter Ranges:

• MAX668EUB+: Supply voltage 3V ~ 28V, switching frequency 100kHz ~ 500kHz, duty cycle max 90%
• MAX669EUB+: Supply voltage 1.8V ~ 28V, switching frequency 100kHz ~ 500kHz, duty cycle max 90%

Both substitutes extend the supply voltage range beyond the original part and provide active product status with modern compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The MAX741UCPP is obsolete, while both MAX668EUB+ and MAX669EUB+ are active products with current manufacturing support. Selection of an active substitute ensures long-term availability and supply chain continuity.

Compliance and Certification: Both substitute parts are ROHS3 compliant, meeting modern environmental and regulatory requirements. The MAX741UCPP is RoHS non-compliant, which may present regulatory constraints in new designs or production environments with strict compliance mandates.

Temperature Operating Range: The substitute parts extend the operating temperature range to -40°C ~ 85°C (TA), compared to the original 0°C ~ 70°C. This provides enhanced thermal performance for applications requiring extended temperature operation.

Supply Voltage Range: MAX669EUB+ offers the lowest minimum supply voltage at 1.8V, providing flexibility for low-voltage applications. MAX668EUB+ maintains a 3V minimum. Both extend the maximum supply voltage to 28V, exceeding the original 15.5V specification.

Package and Mounting Transition: Substitution requires transition from through-hole 20-DIP packaging to surface-mount 10-TFSOP/10-MSOP packages. This represents a significant board-level design change requiring PCB layout modification and assembly process adjustment.

Frequently Asked Questions (FAQ)

Q: Can MAX668EUB+ or MAX669EUB+ directly replace MAX741UCPP in existing designs?

A: Direct pin-for-pin replacement is not possible due to different package types (20-DIP through-hole versus 10-TFSOP/10-MSOP surface-mount). Functional substitution requires PCB redesign and layout modification. Circuit topology compatibility must be verified against specific application requirements.

Q: What is the primary difference between MAX668EUB+ and MAX669EUB+?

A: The primary difference is the minimum supply voltage specification. MAX669EUB+ supports 1.8V ~ 28V, while MAX668EUB+ supports 3V ~ 28V. Both share identical switching frequency range (100kHz ~ 500kHz), duty cycle maximum (90%), and operating temperature range (-40°C ~ 85°C).

Q: Why is the MAX741UCPP obsolete?

A: The MAX741UCPP is classified as obsolete by the manufacturer. Substitute parts represent current-generation alternatives with enhanced specifications, improved compliance certifications, and active production status.

Q: Are there package options available for the substitute parts?

A: Both MAX668EUB+ and MAX669EUB+ are available in 10-TFSOP and 10-MSOP surface-mount packages with 0.118" (3.00mm) width. No through-hole package variants are available for these substitutes.

Q: What control features do the substitute parts provide?

A: MAX668EUB+ and MAX669EUB+ provide Enable and Frequency Control features. The original MAX741UCPP provides Frequency Control and Soft Start. Soft Start functionality may require external circuit implementation if required for the application.

Q: Do the substitute parts support the same topologies as MAX741UCPP?

A: The MAX741UCPP supports Buck and Boost topologies. The substitutes support Boost, Flyback, and SEPIC topologies. Functional overlap exists in step-up and step-down regulation, but topology-specific design considerations must be evaluated for each application.