MAX6194AESA Equivalent & Substitute Parts

Part Overview

The MAX6194AESA is a series voltage reference IC manufactured by Analog Devices Inc./Maxim Integrated, designed for precision power management applications requiring fixed 4.5V output with ±0.04% tolerance. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates across -40°C to 85°C and is packaged in 8-SOIC surface mount configuration with 1057 units currently in stock.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX6194AESA
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)
Reference Type	Series
Output Type	Fixed
Voltage - Output (Fixed)	4.5V
Current - Output	500 µA
Tolerance	±0.04%
Temperature Coefficient	5 ppm/°C
Voltage - Input Range	4.7V ~ 12.6V
Current - Supply	35 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MAX6194AESA is determined by the following critical parameters:

Mechanical Compatibility: Package type (8-SOIC), mounting type (Surface Mount), and physical dimensions (0.154" width, 3.90mm) must match to ensure PCB layout compatibility without redesign.

Electrical Compatibility: Output voltage, output current capability, input voltage range, tolerance, and temperature coefficient define functional equivalence. Parts with identical or superior specifications in these parameters can replace the original component.

Regulatory & Compliance Status: RoHS compliance and product status (Active vs. Obsolete) determine long-term availability and regulatory acceptability for new designs.

Substitute parts are grouped into two categories:

Direct Equivalent (Packaging Variant): MAX6194AESA+ maintains identical electrical specifications and differs only in packaging format (Tube vs. standard packaging), with upgraded RoHS3 compliance and Active product status.

Functional Alternatives (Different Output Voltage): LTC1798CS8 series parts provide fixed voltage reference functionality in the same 8-SOIC package with different output voltage options (4.096V or 5V). These parts feature lower tolerance (±0.15%), higher output current (10 mA), and improved temperature coefficient performance, with availability in both Tube and Tape & Reel packaging formats.

Parameter Comparison

Parameter	MAX6194AESA	MAX6194AESA+	LTC1798CS8-4.1#PBF	LTC1798CS8-4.1#TRPBF	LTC1798CS8-5#PBF	LTC1798CS8-5#TRPBF
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Voltage - Output (Fixed)	4.5V	4.5V	4.096V	4.096V	5V	5V
Current - Output	500 µA	500 µA	10 mA	10 mA	10 mA	10 mA
Tolerance	±0.04%	±0.04%	±0.15%	±0.15%	±0.15%	±0.15%
Temperature Coefficient	5 ppm/°C	5 ppm/°C	40 ppm/°C	40 ppm/°C	40 ppm/°C	40 ppm/°C
Noise - 0.1Hz to 10Hz	110 µVp-p	110 µVp-p	8 µVp-p	8 µVp-p	8 µVp-p	8 µVp-p
Voltage - Input Range	4.7V ~ 12.6V	4.7V ~ 12.6V	4.296V ~ 12.6V	4.296V ~ 12.6V	5.2V ~ 12.6V	5.2V ~ 12.6V
Current - Supply	35 µA	35 µA	8.5 µA	8.5 µA	8.5 µA	8.5 µA
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°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)
Packaging Format	Standard	Tube	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): MAX6194AESA+ is the primary substitute, offering identical electrical performance with Active product status and ROHS3 compliance. This part is recommended for applications requiring the exact 4.5V output specification and extended temperature range (-40°C to 85°C). The upgrade from Obsolete to Active status ensures long-term availability and supply chain continuity.

For 4.096V Output Applications: LTC1798CS8-4.1#PBF (Tube packaging) or LTC1798CS8-4.1#TRPBF (Tape & Reel packaging) provide fixed 4.096V reference with 10 mA output current capability. These parts feature superior noise performance (8 µVp-p vs. 110 µVp-p) and lower supply current (8.5 µA vs. 35 µA). Operating temperature range is restricted to 0°C to 70°C, which may limit use in extended temperature applications. ROHS3 compliance is confirmed.

For 5V Output Applications: LTC1798CS8-5#PBF (Tube packaging) or LTC1798CS8-5#TRPBF (Tape & Reel packaging) deliver fixed 5V reference with identical performance characteristics to the 4.096V variants. These parts are suitable for systems requiring 5V precision reference with higher output current capability. Operating temperature range is 0°C to 70°C. ROHS3 compliance is confirmed.

Packaging Selection: Tube packaging is appropriate for lower-volume applications and manual assembly. Tape & Reel packaging is specified for high-volume automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MAX6194AESA+ directly replace MAX6194AESA without circuit modification?

A: Yes. MAX6194AESA+ maintains identical electrical specifications (4.5V output, ±0.04% tolerance, 500 µA output current, 5 ppm/°C temperature coefficient) and package configuration (8-SOIC). The only differences are packaging format (Tube) and upgraded compliance status (ROHS3 Compliant, Active product status). No circuit redesign is required.

Q: What are the key differences between MAX6194AESA and LTC1798CS8 series parts?

A: Output voltage differs (4.5V vs. 4.096V or 5V). LTC1798CS8 parts feature lower tolerance (±0.15% vs. ±0.04%), higher output current (10 mA vs. 500 µA), superior noise performance (8 µVp-p vs. 110 µVp-p), and lower supply current (8.5 µA vs. 35 µA). Operating temperature range is narrower (0°C to 70°C vs. -40°C to 85°C). All parts share identical 8-SOIC package configuration.

Q: Which LTC1798CS8 variant should be selected for 5V applications?

A: LTC1798CS8-5#PBF (Tube) or LTC1798CS8-5#TRPBF (Tape & Reel) provide fixed 5V output. Selection between Tube and Tape & Reel depends on assembly process requirements: Tube for manual or low-volume assembly, Tape & Reel for automated high-volume production.

Q: Are all substitute parts RoHS compliant?

A: MAX6194AESA is RoHS non-compliant. MAX6194AESA+ and all LTC1798CS8 variants are ROHS3 Compliant. For applications requiring RoHS compliance, MAX6194AESA+ or LTC1798CS8 series parts must be specified.

Q: What is the impact of operating temperature range differences?

A: MAX6194AESA and MAX6194AESA+ operate across -40°C to 85°C. LTC1798CS8 series parts operate across 0°C to 70°C. Applications requiring operation below 0°C or above 70°C must use MAX6194AESA+ to maintain specification compliance.

Q: Can LTC1798CS8 parts be used in applications originally designed for MAX6194AESA?

A: Substitution is possible only if the application tolerates the following parameter changes: different output voltage (4.096V or 5V instead of 4.5V), lower tolerance (±0.15% instead of ±0.04%), higher temperature coefficient (40 ppm/°C instead of 5 ppm/°C), and narrower operating temperature range (0°C to 70°C instead of -40°C to 85°C). Circuit validation is required to confirm compatibility with these parameter variations.

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