MAX5094BASA Equivalent & Substitute Parts

Part Overview

The MAX5094BASA is a flyback and forward converter regulator controller IC manufactured by Analog Devices Inc./Maxim Integrated, designed for step-up/step-down DC-DC conversion applications with positive, isolation-capable output configuration. This device operates as a transistor driver with frequency control capabilities across a 10kHz to 500kHz switching frequency range.

The MAX5094BASA is classified as obsolete, which necessitates identification of equivalent substitute components for new designs or production continuity. Active alternatives from both Analog Devices and Texas Instruments provide functionally compatible solutions while maintaining design specifications.

Key Parameters

Parameter	Value
Topology	Flyback, Forward Converter
Output Type	Transistor Driver
Function	Step-Up/Step-Down
Output Configuration	Positive, Isolation Capable
Number of Outputs	1
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V
Frequency - Switching	10kHz ~ 500kHz
Duty Cycle (Max)	49.8%
Control Features	Frequency Control
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX5094BASA is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 8-SOIC surface mount packaging with identical 0.154" (3.90mm) width to ensure PCB layout compatibility without redesign.
Topology and Function: Substitute parts must support flyback and forward converter topologies with step-up/step-down DC-DC control capability.
Output Configuration: Positive, isolation-capable output configuration is required.
Supply Voltage Range: Operating supply voltage must encompass or overlap the 7.6V ~ 30V range.
Switching Frequency Range: Frequency control capability within or compatible with the 10kHz ~ 500kHz range.
Control Architecture: Transistor driver output type with frequency control features.
Compliance Standards: RoHS3 compliance and MSL Level 1 rating ensure environmental and handling compatibility.

The MAX5094BASA+ (active variant with tube packaging) and Texas Instruments UC184x series (UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, UC1845AMDREP) meet these substitution criteria.

Parameter Comparison

Parameter	MAX5094BASA	MAX5094BASA+	UC1842AMDREP	UC1843AMDREP	UC1844AMDREP	UC1845AMDREP
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Topology	Flyback, Forward Converter	Flyback, Forward Converter	Flyback, Forward Converter	Flyback, Forward Converter	Flyback, Forward Converter	Flyback, Forward Converter
Output Type	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver
Function	Step-Up/Step-Down	Step-Up/Step-Down	Step-Up/Step-Down	Step-Up/Step-Down	Step-Up/Step-Down	Step-Up/Step-Down
Output Configuration	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V	7.6V ~ 30V	10V ~ 30V	7.9V ~ 30V	10V ~ 30V	7.9V ~ 30V
Frequency - Switching	10kHz ~ 500kHz	10kHz ~ 500kHz	10kHz ~ 500kHz	10kHz ~ 500kHz	10kHz ~ 500kHz	10kHz ~ 500kHz
Duty Cycle (Max)	49.8%	49.8%	49.8%	49.8%	49.8%	49.8%
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: MAX5094BASA+

The MAX5094BASA+ is the direct active equivalent from Analog Devices Inc./Maxim Integrated. This part maintains identical electrical specifications and packaging to the obsolete MAX5094BASA while offering active product status and continuous manufacturing support. The MAX5094BASA+ is available in tube packaging and represents the lowest-risk substitution path for existing designs.

Secondary Substitutes: Texas Instruments UC184x Series

The UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, and UC1845AMDREP from Texas Instruments provide functionally equivalent PWM controller solutions. These parts share identical package geometry, topology support, and control architecture. The UC184x series demonstrates extended operating temperature range (-55°C ~ 125°C ambient versus -40°C ~ 125°C junction for MAX5094BASA), providing enhanced thermal margin in certain applications.

Supply voltage specifications show minor variations: UC1842AMDREP and UC1844AMDREP operate from 10V ~ 30V, while UC1843AMDREP and UC1845AMDREP operate from 7.9V ~ 30V. Applications requiring operation below 10V should select UC1843AMDREP or UC1845AMDREP to maintain full supply voltage compatibility with the original MAX5094BASA specification.

All substitute parts maintain RoHS3 compliance and MSL Level 1 rating, ensuring compatibility with existing manufacturing and handling procedures.

Frequently Asked Questions (FAQ)

Q: Can MAX5094BASA+ be used as a direct replacement for MAX5094BASA?

A: Yes. The MAX5094BASA+ is the active production equivalent with identical electrical specifications, package geometry, and functional characteristics. No circuit redesign is required.

Q: What are the key differences between MAX5094BASA and the Texas Instruments UC184x series?

A: Both device families support identical topologies, switching frequency ranges, and duty cycle specifications. Primary differences include manufacturer source and operating temperature range. Texas Instruments UC184x devices specify -55°C ~ 125°C ambient temperature operation compared to MAX5094BASA's -40°C ~ 125°C junction temperature specification. Supply voltage ranges vary slightly among UC184x variants.

Q: Which Texas Instruments part should be selected for applications with supply voltages below 10V?

A: UC1843AMDREP or UC1845AMDREP are required for applications operating below 10V supply voltage, as these parts specify 7.9V ~ 30V supply range. UC1842AMDREP and UC1844AMDREP specify minimum 10V supply voltage and are not suitable for sub-10V applications.

Q: Are all substitute parts available in 8-SOIC packaging?

A: Yes. All listed substitute parts use identical 8-SOIC (0.154", 3.90mm width) surface mount packaging, enabling direct PCB layout compatibility without modification.

Q: Do substitute parts maintain RoHS3 compliance?

A: Yes. MAX5094BASA+, UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, and UC1845AMDREP are all ROHS3 compliant with MSL Level 1 moisture sensitivity rating.

Q: What is the difference between UC1842AMDREP and UC1843AMDREP?

A: Both parts support identical topologies and switching frequency ranges. UC1842AMDREP specifies 10V ~ 30V supply voltage, while UC1843AMDREP specifies 7.9V ~ 30V supply voltage. UC1843AMDREP provides broader supply voltage compatibility for designs requiring operation below 10V.

Q: What is the difference between UC1844AMDREP and UC1845AMDREP?

A: Both parts support identical topologies and switching frequency ranges. UC1844AMDREP specifies 10V ~ 30V supply voltage, while UC1845AMDREP specifies 7.9V ~ 30V supply voltage. UC1845AMDREP provides broader supply voltage compatibility for designs requiring operation below 10V.

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