MAX6194CESA Series Voltage Reference IC Equivalent & Substitute Parts

Part Overview

The MAX6194CESA is a series voltage reference IC manufactured by Analog Devices Inc./Maxim Integrated, designed for precision power management applications requiring a fixed 4.5V output. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production support. The MAX6194CESA operates as a fixed output voltage reference with ±0.22% tolerance, suitable for applications demanding stable reference voltages in the 4.5V range with moderate current output capability.

Substiute Parts

MAX6194CESA

Analog Devices Inc./Maxim IntegratedIn Stock: 5208MAX6194CESA Datasheet

Current PartRFQ

MAX6194CESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 790MAX6194CESA+ Datasheet

DirectRFQ

LTC1798CS8-4.1#PBF

Analog Devices Inc.In Stock: 1238LTC1798CS8-4.1#PBF Datasheet

MFR RecommendedRFQ

LTC1798CS8-4.1#TRPBF

Analog Devices Inc.In Stock: 863LTC1798CS8-4.1#TRPBF Datasheet

MFR RecommendedRFQ

LTC1798CS8-5#PBF

Analog Devices Inc.In Stock: 2356LTC1798CS8-5#PBF Datasheet

MFR RecommendedRFQ

LTC1798CS8-5#TRPBF

Analog Devices Inc.In Stock: 2557LTC1798CS8-5#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX6194CESA is determined by the following critical parameters:

Primary Substitution Criteria:

• Package compatibility: 8-SOIC form factor (0.154", 3.90mm Width)
• Mounting type: Surface Mount
• Reference type: Series voltage reference
• Output type: Fixed voltage output
• Voltage output range: 4.5V nominal or compatible alternative
• Current output capability: Minimum 500 µA
• Tolerance specification: ±0.22% or better
• Temperature coefficient: 25 ppm/°C or lower
• Input voltage range: Overlap with 4.7V ~ 12.6V
• Operating temperature range: Coverage of -40°C ~ 85°C or subset thereof

Substitute Categories:

Category 1: Direct Packaging Equivalent (MAX6194CESA+) Identical electrical specifications with improved RoHS compliance. Packaging variant only (Bulk vs. standard).

Category 2: Manufacturer-Recommended Alternatives (LTC1798 Series) Active product status alternatives from Analog Devices Inc. with enhanced performance characteristics. These parts offer superior tolerance (±0.15%), lower noise, and active product support, though with different output voltage options (4.096V or 5V) and higher output current capability (10 mA).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): MAX6194CESA+ is the appropriate selection when exact electrical and thermal specifications must be maintained. This part provides identical performance characteristics to the original MAX6194CESA while offering improved RoHS3 compliance. Current inventory of 704 units supports immediate deployment.

For New Designs and Long-Term Production: The LTC1798 series represents the manufacturer-recommended transition path from the obsolete MAX6194CESA. These parts are active products with full manufacturer support and ROHS3 compliance. Selection between LTC1798CS8-4.1 and LTC1798CS8-5 variants depends on the required output voltage:

• LTC1798CS8-4.1#PBF or LTC1798CS8-4.1#TRPBF: 4.096V output, suitable for applications requiring precision 4.096V references
• LTC1798CS8-5#PBF or LTC1798CS8-5#TRPBF: 5V output, suitable for standard 5V reference applications

Packaging Considerations:

• Tube packaging (#PBF variants): Appropriate for lower-volume applications and manual assembly
• Tape & Reel packaging (#TRPBF variants): Optimized for high-volume automated assembly

Temperature Range Limitation: LTC1798 series operates within 0°C ~ 70°C, which is narrower than the MAX6194CESA range of -40°C ~ 85°C. Applications requiring full -40°C ~ 85°C operation must retain MAX6194CESA+ or evaluate alternative reference architectures.

Frequently Asked Questions (FAQ)

Q: Can LTC1798CS8-4.1 or LTC1798CS8-5 directly replace MAX6194CESA in existing designs?

A: Direct replacement requires circuit evaluation. While all parts share the 8-SOIC package and series reference architecture, the LTC1798 variants have different output voltages (4.096V or 5V vs. 4.5V). Additionally, the LTC1798 operating temperature range (0°C ~ 70°C) is narrower than MAX6194CESA (-40°C ~ 85°C). Designs operating below 0°C or above 70°C must use MAX6194CESA+. For applications tolerating the voltage and temperature differences, the LTC1798 series offers superior tolerance (±0.15% vs. ±0.22%) and significantly lower noise.

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

A: Both parts are electrically identical with the same 4.096V output and specifications. The difference is packaging format: #PBF indicates Tube packaging suitable for manual handling and lower-volume applications, while #TRPBF indicates Tape & Reel packaging optimized for automated pick-and-place assembly in high-volume production.

Q: Why does MAX6194CESA+ have better RoHS compliance than MAX6194CESA?

A: MAX6194CESA+ is ROHS3 compliant while MAX6194CESA is RoHS non-compliant. This reflects manufacturing process improvements and material substitutions implemented after the original MAX6194CESA design. Both parts are electrically and mechanically identical.

Q: Is the LTC1798 series suitable for applications requiring the exact 4.5V output of MAX6194CESA?

A: The LTC1798 series does not offer a 4.5V variant. Available options are 4.096V (LTC1798CS8-4.1) and 5V (LTC1798CS8-5). For applications requiring precisely 4.5V output, MAX6194CESA+ is the appropriate selection. For applications where 4.096V or 5V outputs are acceptable, the LTC1798 series provides active product support and superior performance characteristics.

Q: What are the noise performance differences between MAX6194CESA and LTC1798 series?

A: MAX6194CESA exhibits 110 µVp-p noise (0.1Hz to 10Hz) and 215 µVrms noise (10Hz to 10kHz). LTC1798 series demonstrates significantly lower noise at 8 µVp-p (0.1Hz to 10Hz). Applications sensitive to reference noise benefit from LTC1798 selection, provided voltage and temperature requirements are compatible.

Q: Can MAX6194CESA+ be used in applications requiring -40°C operation?

A: Yes. MAX6194CESA+ maintains the full -40°C ~ 85°C operating temperature range of the original MAX6194CESA. The LTC1798 series, by contrast, operates only within 0°C ~ 70°C. Applications requiring extended low-temperature operation must use MAX6194CESA+.