MAX6166AESA Equivalent & Substitute Parts

Part Overview

The MAX6166AESA is a series voltage reference IC manufactured by Analog Devices Inc./Maxim Integrated, delivering a fixed 2.5V output with ±0.08% tolerance. This device operates as a precision voltage reference in the Power Management (PMIC) category, housed in an 8-SOIC surface mount package. The MAX6166AESA is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across output voltage, tolerance, temperature coefficient, noise characteristics, and input voltage range while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	2.5V	V
Output Current	5	mA
Tolerance	±0.08%	-
Temperature Coefficient	5	ppm/°C
Noise (0.1Hz to 10Hz)	27	µVp-p
Noise (10Hz to 10kHz)	30	µVrms
Input Voltage Range	2.7V ~ 12.6V	V
Supply Current	120	µA
Operating Temperature	-40°C ~ 85°C	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	-
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitution for the MAX6166AESA is determined by strict electrical and mechanical compatibility across the following critical parameters:

Primary Compatibility Criteria:

Output voltage: 2.5V fixed
Output current: 5 mA minimum
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
RoHS3 compliance and MSL Level 1

Secondary Compatibility Criteria (Allowable Variations):

Tolerance: ±0.08% or tighter (lower tolerance values are acceptable)
Temperature coefficient: 5 ppm/°C or lower (lower values indicate better stability)
Noise characteristics: 27 µVp-p (0.1Hz to 10Hz) or lower
Input voltage range: Must encompass or exceed 2.7V ~ 12.6V
Supply current: 120 µA or lower (lower consumption is acceptable)
Operating temperature: Must include -40°C ~ 85°C minimum range

Substitute parts are grouped by tolerance grade, as this parameter directly affects circuit precision requirements. Parts with tighter tolerance specifications (±0.08%) are direct equivalents. Parts with looser tolerances (±0.12%, ±0.24%, ±0.33%) are acceptable only when application requirements permit relaxed precision.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Tolerance	Temp Coeff	Noise (0.1-10Hz)	Input Voltage	Supply Current	Operating Temp	Package	Status
MAX6166AESA	Analog Devices / Maxim	2.5V	±0.08%	5 ppm/°C	27 µVp-p	2.7V ~ 12.6V	120 µA	-40°C ~ 85°C	8-SOIC	Obsolete
MAX6166AESA+	Analog Devices / Maxim	2.5V	±0.08%	5 ppm/°C	27 µVp-p	2.7V ~ 12.6V	120 µA	-40°C ~ 85°C	8-SOIC	Active
ADR291ERZ	Analog Devices	2.5V	±0.08%	8 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active
ADR291ERZ-REEL7	Analog Devices	2.5V	±0.08%	8 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active
ADR291FRZ	Analog Devices	2.5V	±0.12%	15 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active
ADR291FRZ-REEL	Analog Devices	2.5V	±0.12%	15 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active
ADR291FRZ-REEL7	Analog Devices	2.5V	±0.12%	15 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active
ADR291GRZ	Analog Devices	2.5V	±0.24%	25 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active
ADR291GRZ-REEL	Analog Devices	2.5V	±0.24%	25 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active
ADR291GRZ-REEL7	Analog Devices	2.5V	±0.24%	25 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active
ADR291WFRZ-R7	Analog Devices	2.5V	±0.33%	15 ppm/°C	8 µVp-p	3V ~ 15V	15 µA	-40°C ~ 125°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Equivalent (Identical Electrical Performance): MAX6166AESA+ is the active production equivalent of the obsolete MAX6166AESA. Both parts deliver ±0.08% tolerance, 5 ppm/°C temperature coefficient, and identical noise specifications. The primary difference is product status (Active vs. Obsolete) and packaging format (Tube). This part is the preferred choice for designs requiring the original electrical specifications.

Precision-Grade Substitutes (±0.08% Tolerance): ADR291ERZ and ADR291ERZ-REEL7 maintain the ±0.08% tolerance specification while offering improved performance characteristics: lower temperature coefficient (8 ppm/°C vs. 5 ppm/°C), significantly lower noise (8 µVp-p vs. 27 µVp-p), reduced supply current (15 µA vs. 120 µA), and extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). Input voltage range expands to 3V ~ 15V. These parts are suitable for applications where the original tolerance requirement is maintained and enhanced performance is beneficial.

Standard-Grade Substitutes (±0.12% Tolerance): ADR291FRZ, ADR291FRZ-REEL, and ADR291FRZ-REEL7 are acceptable when application tolerance requirements permit ±0.12% specification. These parts share the same 2.5V output, 5 mA current, and 8-SOIC package. Temperature coefficient increases to 15 ppm/°C, and supply current reduces to 15 µA. Operating temperature extends to -40°C ~ 125°C.

Economy-Grade Substitutes (±0.24% and ±0.33% Tolerance): ADR291GRZ, ADR291GRZ-REEL, ADR291GRZ-REEL7, and ADR291WFRZ-R7 are applicable only when application precision requirements allow relaxed tolerance specifications. ADR291WFRZ-R7 includes automotive-grade qualification. These parts maintain 2.5V output and 8-SOIC package with further reduced supply current (15 µA) and extended temperature range.

All substitute parts maintain RoHS3 compliance, MSL Level 1 rating, and 8-SOIC surface mount packaging. Selection depends on application tolerance requirements, temperature operating range, and supply current budget.

Frequently Asked Questions (FAQ)

Q: Can ADR291ERZ replace MAX6166AESA in all applications? A: ADR291ERZ maintains the ±0.08% tolerance specification and improves upon the original part's noise and temperature coefficient performance. The expanded input voltage range (3V ~ 15V vs. 2.7V ~ 12.6V) and extended operating temperature (-40°C ~ 125°C vs. -40°C ~ 85°C) make it suitable for most applications. Verify that your circuit's input voltage supply meets the 3V minimum requirement.

Q: What is the difference between ADR291ERZ and ADR291ERZ-REEL7? A: Both parts are electrically identical with ±0.08% tolerance and identical performance specifications. The difference is packaging format: ADR291ERZ is supplied in Tube packaging, while ADR291ERZ-REEL7 is supplied in Cut Tape (CT) & Digi-Reel® format. Select based on your assembly process requirements and tape-and-reel compatibility.

Q: Can I use ADR291FRZ (±0.12% tolerance) instead of MAX6166AESA (±0.08% tolerance)? A: ADR291FRZ is acceptable only if your application tolerance budget permits ±0.12% output voltage variation. If your circuit design requires ±0.08% precision, ADR291FRZ does not meet specifications. Verify tolerance requirements in your circuit design documentation before substitution.

Q: What are the advantages of ADR291 series parts over MAX6166AESA? A: ADR291 series parts offer lower noise (8 µVp-p vs. 27 µVp-p), significantly reduced supply current (15 µA vs. 120 µA), and extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). These improvements reduce power consumption and enable operation in higher temperature environments.

Q: Are all substitute parts available in 8-SOIC package? A: Yes. All substitute parts listed are housed in 8-SOIC (0.154", 3.90mm Width) surface mount package, maintaining mechanical and electrical compatibility with MAX6166AESA PCB layouts.

Q: What does the "-REEL7" or "-REEL" suffix indicate? A: These suffixes denote tape-and-reel packaging formats. "-REEL7" indicates Cut Tape (CT) & Digi-Reel® packaging, while "-REEL" indicates standard Tape & Reel (TR) format. These are packaging variants of the same electrical part, selected based on assembly equipment compatibility.

Q: Is ADR291WFRZ-R7 suitable for automotive applications? A: ADR291WFRZ-R7 carries automotive-grade qualification. It is suitable for automotive applications requiring ±0.33% tolerance, 2.5V output, and 8-SOIC package. Verify that your application tolerance requirements align with the ±0.33% specification.

Q: Do all substitute parts maintain RoHS3 compliance? A: Yes. All substitute parts listed are RoHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of MAX6166AESA.

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