MAX5071BASA Equivalent & Substitute Parts

Part Overview

The MAX5071BASA is a flyback regulator controller IC manufactured by Analog Devices Inc./Maxim Integrated, designed for positive, isolation-capable step-up/step-down DC-DC conversion applications. This device operates as a transistor driver with frequency control capabilities across a 20kHz to 1MHz switching frequency range and a 10.8V to 30V supply voltage range.

The MAX5071BASA has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this controller topology.

Substiute Parts

MAX5071BASA

Analog Devices Inc./Maxim IntegratedIn Stock: 915MAX5071BASA Datasheet

Current PartRFQ

MAX5071BASA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1170MAX5071BASA+ Datasheet

DirectRFQ

UC1842AMDREP

Texas InstrumentsIn Stock: 2758UC1842AMDREP Datasheet

MFR RecommendedRFQ

UC1843AMDREP

Texas InstrumentsIn Stock: 1508UC1843AMDREP Datasheet

MFR RecommendedRFQ

UC1844AMDREP

Texas InstrumentsIn Stock: 1330UC1844AMDREP Datasheet

MFR RecommendedRFQ

UC1845AMDREP

Texas InstrumentsIn Stock: 1830UC1845AMDREP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX5071BASA is determined by strict alignment of the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility without redesign.

Electrical Specifications: Substitute parts must support the supply voltage range of 10.8V to 30V and maintain switching frequency operation within the 20kHz to 1MHz range. The duty cycle maximum of 49.8% establishes the operational boundary for controller selection.

Topology and Output Configuration: Substitute parts must function as flyback regulator controllers with positive, isolation-capable output configuration and transistor driver output type to maintain circuit topology compatibility.

Control Architecture: Frequency control capability is required for functional equivalence in the target application.

Environmental and Compliance Requirements: All substitute parts must maintain ROHS3 compliance and MSL 1 rating to satisfy manufacturing and environmental standards.

The substitute parts identified—MAX5071BASA+, UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, and UC1845AMDREP—meet these criteria through matching package geometry, electrical operating ranges, and control feature sets.

Parameter Comparison

Engineering Selection Recommendations

MAX5071BASA+ (Direct Equivalent): This part is the active production variant of the MAX5071BASA, manufactured by the same supplier with identical electrical specifications and package geometry. The MAX5071BASA+ is the primary recommended substitute due to direct functional equivalence and active product status. Packaging differs (Tube versus unspecified for original), but electrical performance and pinout remain unchanged.

UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, UC1845AMDREP (Texas Instruments PWM Controllers): These Texas Instruments PWM controller ICs provide functional substitution for flyback regulator applications. All four parts maintain the 8-SOIC package format and ROHS3 compliance. Supply voltage ranges vary slightly across the family: UC1842AMDREP and UC1844AMDREP support 10V to 30V, while UC1843AMDREP and UC1845AMDREP support 7.9V to 30V. All parts operate within the required switching frequency and duty cycle parameters. The Texas Instruments family offers extended operating temperature range (-55°C to 125°C ambient) compared to the MAX5071BASA junction temperature specification, providing additional thermal margin in certain applications.

Selection between these alternatives depends on specific supply voltage requirements and thermal operating conditions of the target application.

Frequently Asked Questions (FAQ)

Q: Can MAX5071BASA+ be used as a direct replacement for MAX5071BASA?

A: Yes. MAX5071BASA+ is the active production equivalent manufactured by Analog Devices Inc./Maxim Integrated with identical electrical specifications, package geometry, and pinout. The only difference is packaging format (Tube). No circuit redesign is required.

Q: What are the key differences between the Maxim and Texas Instruments substitute options?

A: MAX5071BASA+ maintains identical specifications to the original part and is manufactured by the same supplier. The Texas Instruments UC184x family (UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, UC1845AMDREP) provides alternative PWM controller functionality with the same 8-SOIC package. All parts meet ROHS3 compliance and MSL 1 requirements. Supply voltage ranges differ slightly: UC1842AMDREP and UC1844AMDREP require minimum 10V, while UC1843AMDREP and UC1845AMDREP operate from 7.9V minimum.

Q: Are all substitute parts pin-compatible with the original MAX5071BASA?

A: All substitute parts use the 8-SOIC package with identical physical dimensions (0.154", 3.90mm Width). Pin compatibility for specific applications must be verified against detailed pinout documentation and application circuit requirements, as PWM controller families may have different pin assignments despite identical package format.

Q: What is the impact of the extended operating temperature range on the Texas Instruments parts?

A: The Texas Instruments UC184x family specifies -55°C to 125°C ambient temperature (TA) operation, compared to the MAX5071BASA -40°C to 125°C junction temperature (TJ) specification. This provides extended low-temperature operation capability. Applications operating below -40°C ambient may benefit from Texas Instruments alternatives, though thermal design and specific application requirements must be evaluated.

Q: Are all substitute parts currently in active production?

A: MAX5071BASA+ and all Texas Instruments UC184x variants (UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, UC1845AMDREP) maintain active product status. The original MAX5071BASA is obsolete. Active production status ensures ongoing availability and supply chain reliability for new designs and production continuity.