MAX6194BESA Series Voltage Reference IC Equivalent & Substitute Parts

Part Overview

The MAX6194BESA is a series voltage reference IC from Analog Devices Inc./Maxim Integrated, designed for precision power management applications requiring fixed 4.5V output with ±0.11% tolerance. This component operates across a 4.7V to 12.6V input range and delivers 500 µA output current with low noise characteristics suitable for analog signal conditioning and reference applications.

The MAX6194BESA is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term production requirements for systems utilizing this voltage reference topology.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	4.5V
Output Current	500 µA
Tolerance	±0.11%
Temperature Coefficient	10 ppm/°C
Noise (0.1Hz to 10Hz)	110 µVp-p
Noise (10Hz to 10kHz)	215 µVrms
Input Voltage Range	4.7V ~ 12.6V
Supply Current	35 µA
Operating Temperature	-40°C ~ 85°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX6194BESA is determined by the following critical parameters:

Electrical Compatibility Requirements:

Fixed output voltage matching or application-compatible voltage levels
Output current capability meeting or exceeding 500 µA minimum
Tolerance specification of ±0.11% or better
Temperature coefficient of 10 ppm/°C or lower
Input voltage range encompassing 4.7V ~ 12.6V
Operating temperature range including -40°C ~ 85°C

Mechanical Compatibility Requirements:

8-SOIC package form factor (0.154", 3.90mm Width)
Surface mount mounting type

Compliance and Status:

Active product status preferred for long-term availability
RoHS3 compliance for regulatory alignment

The substitute parts identified fall into two categories: direct packaging variants of the same base product (MAX6194BESA+) and manufacturer-recommended alternatives from the LTC1798 series with modified electrical specifications.

Parameter Comparison

Parameter	MAX6194BESA	MAX6194BESA+	LTC1798CS8-4.1#PBF	LTC1798CS8-4.1#TRPBF	LTC1798CS8-5#PBF	LTC1798CS8-5#TRPBF
Output Voltage	4.5V	4.5V	4.096V	4.096V	5V	5V
Output Current	500 µA	500 µA	10 mA	10 mA	10 mA	10 mA
Tolerance	±0.11%	±0.11%	±0.15%	±0.15%	±0.15%	±0.15%
Temperature Coefficient	10 ppm/°C	10 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
Input Voltage 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
Supply Current	35 µA	35 µA	8.5 µA	8.5 µA	8.5 µA	8.5 µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tube	Tube	Tape & Reel	Tube	Tape & Reel

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

MAX6194BESA+ is the primary substitute, offering identical electrical specifications with active product status and ROHS3 compliance. This part maintains the 4.5V output, ±0.11% tolerance, and 10 ppm/°C temperature coefficient of the original MAX6194BESA. The only difference is packaging format (Tube vs. Bulk) and compliance status. This substitution requires no circuit redesign.

Alternative Substitutes (Modified Electrical Specifications):

The LTC1798CS8 series parts from Analog Devices Inc. provide alternative voltage reference solutions with different output voltage options:

LTC1798CS8-4.1#PBF / LTC1798CS8-4.1#TRPBF: Fixed 4.096V output. These parts deliver 10 mA output current (20× the original), lower supply current (8.5 µA vs. 35 µA), and significantly lower noise (8 µVp-p vs. 110 µVp-p). Operating temperature range is restricted to 0°C ~ 70°C. Tolerance is ±0.15% and temperature coefficient is 40 ppm/°C. Suitable for applications where the 4.096V output is acceptable and extended low-temperature operation below 0°C is not required.
LTC1798CS8-5#PBF / LTC1798CS8-5#TRPBF: Fixed 5V output. Specifications match the 4.1V variants except for output voltage. Suitable for applications requiring 5V reference with identical performance trade-offs.

All substitute parts maintain 8-SOIC package compatibility and surface mount mounting type. All active substitutes carry ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can MAX6194BESA+ be used as a direct replacement for MAX6194BESA?

A: Yes. MAX6194BESA+ is electrically and mechanically identical to MAX6194BESA. The only differences are product status (Active vs. Obsolete), packaging format (Tube vs. Bulk), and RoHS compliance (ROHS3 vs. Non-compliant). No circuit modifications are required.

Q: What are the key differences between MAX6194BESA and LTC1798CS8 series parts?

A: The LTC1798CS8 series offers higher output current capability (10 mA vs. 500 µA), lower supply current consumption (8.5 µA vs. 35 µA), and significantly lower noise performance (8 µVp-p vs. 110 µVp-p). However, tolerance is degraded to ±0.15%, temperature coefficient increases to 40 ppm/°C, and operating temperature range is limited to 0°C ~ 70°C. Output voltage options differ: 4.096V or 5V instead of 4.5V.

Q: Can I use LTC1798CS8-5#PBF if my circuit requires exactly 4.5V output?

A: No. The LTC1798CS8-5#PBF provides fixed 5V output. If your circuit requires 4.5V, use MAX6194BESA+ for identical performance or LTC1798CS8-4.1#PBF if 4.096V is acceptable. Output voltage is not adjustable on these fixed reference ICs.

Q: What is the difference between LTC1798CS8-4.1#PBF and LTC1798CS8-4.1#TRPBF?

A: Both parts are electrically identical. The difference is packaging format: #PBF indicates Tube packaging, while #TRPBF indicates Tape & Reel (TR) packaging. Tape & Reel format is typically used for automated assembly processes, while Tube packaging is used for manual handling or lower-volume applications.

Q: Is the operating temperature range difference significant?

A: Yes. MAX6194BESA operates from -40°C to 85°C, while LTC1798CS8 series parts operate from 0°C to 70°C. If your application requires operation below 0°C or above 70°C, use MAX6194BESA+ instead of LTC1798 alternatives.

Q: Are all substitute parts RoHS compliant?

A: MAX6194BESA is RoHS non-compliant. MAX6194BESA+ and all LTC1798CS8 variants are ROHS3 compliant. If RoHS compliance is required for your application, use MAX6194BESA+ or any LTC1798CS8 variant.

Q: Can I use these parts interchangeably in my existing PCB design?

A: All substitute parts use the same 8-SOIC package with identical pinout and footprint. Physical PCB compatibility is maintained. However, electrical performance differences (output voltage, tolerance, temperature coefficient, noise) must be evaluated against your circuit requirements before substitution.

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