MAX6166BESA Equivalent & Substitute Parts

Part Overview

The MAX6166BESA is a series voltage reference IC manufactured by Analog Devices Inc./Maxim Integrated, delivering a fixed 2.5V output with ±0.2% tolerance in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MAX6166BESA operates across a -40°C to 85°C temperature range with 5 mA output current capability and 120µA supply current, suitable for precision analog applications requiring stable voltage references.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX6166BESA
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)
Reference Type	Series
Output Type	Fixed
Voltage - Output	2.5V
Current - Output	5 mA
Tolerance	±0.2%
Temperature Coefficient	10ppm/°C
Voltage - Input	2.7V ~ 12.6V
Current - Supply	120µA
Operating Temperature	-40°C ~ 85°C
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 for the MAX6166BESA is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Compatibility Parameters:

Output voltage: 2.5V fixed (all substitutes match)
Output current: 5 mA (all substitutes match)
Package type: 8-SOIC surface mount (all substitutes match)
Input voltage range: Must accommodate 2.7V ~ 12.6V minimum
Operating temperature: Must support -40°C ~ 85°C minimum
Mounting type: Surface mount only

Tolerance and Performance Variations: Substitute parts are grouped by output voltage tolerance specification, which directly affects circuit accuracy. Tighter tolerance parts (lower percentage) provide superior performance but may have different temperature coefficients and noise characteristics. All listed substitutes maintain the same 2.5V fixed output and 5 mA output current, ensuring functional compatibility in existing designs.

Packaging Variants: Substitutes include different packaging options (Tube, Cut Tape & Digi-Reel, Tape & Reel) representing the same electrical component in different distribution formats. These variants do not affect electrical performance or PCB compatibility.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Coeff (ppm/°C)	Noise 0.1-10Hz (µVp-p)	Input Voltage	Supply Current (µA)	Operating Temp (°C)	Product Status	RoHS Status
MAX6166BESA	Analog Devices/Maxim	±0.2%	10	27	2.7 ~ 12.6V	120	-40 ~ 85	Obsolete	Non-compliant
MAX6166BESA+	Analog Devices/Maxim	±0.2%	10	27	2.7 ~ 12.6V	120	-40 ~ 85	Active	ROHS3 Compliant
ADR291ERZ	Analog Devices	±0.08%	8	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant
ADR291ERZ-REEL7	Analog Devices	±0.08%	8	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant
ADR291FRZ	Analog Devices	±0.12%	15	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant
ADR291FRZ-REEL	Analog Devices	±0.12%	15	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant
ADR291FRZ-REEL7	Analog Devices	±0.12%	15	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant
ADR291GRZ	Analog Devices	±0.24%	25	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant
ADR291GRZ-REEL	Analog Devices	±0.24%	25	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant
ADR291GRZ-REEL7	Analog Devices	±0.24%	25	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant
ADR291WFRZ-R7	Analog Devices	±0.33%	15	8	3 ~ 15V	15	-40 ~ 125	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Electrical Equivalence): MAX6166BESA+ is the direct active equivalent, maintaining identical electrical specifications (±0.2% tolerance, 10ppm/°C temperature coefficient, 27µVp-p noise) while offering ROHS3 compliance and active product status. This part is the primary choice for designs requiring no circuit modification.

Performance-Enhanced Alternatives (ADR291 Series): The ADR291 series from Analog Devices provides superior performance characteristics across all variants. All ADR291 parts deliver tighter tolerance (±0.08% to ±0.24%), lower noise floor (8µVp-p), reduced supply current (15µA vs. 120µA), and extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C). These parts are fully ROHS3 compliant and carry active product status.

Tolerance-Based Selection Within ADR291 Series:

ADR291ERZ/ERZ-REEL7: ±0.08% tolerance, 8ppm/°C, optimal for precision applications
ADR291FRZ variants: ±0.12% tolerance, 15ppm/°C, balanced performance
ADR291GRZ variants: ±0.24% tolerance, 25ppm/°C, cost-effective alternative
ADR291WFRZ-R7: ±0.33% tolerance, automotive grade, 15ppm/°C

Compliance Considerations: All substitute parts except the original MAX6166BESA are ROHS3 compliant. For applications requiring RoHS compliance, MAX6166BESA+ or any ADR291 variant satisfies regulatory requirements. The original MAX6166BESA is non-compliant and should be replaced in new designs subject to RoHS directives.

Packaging Format Selection: Tube packaging suits low-volume manual assembly. Cut Tape & Digi-Reel (CT) and Tape & Reel (TR) formats support automated pick-and-place manufacturing. Electrical performance is identical across all packaging variants of the same part number.

Frequently Asked Questions (FAQ)

Q: Can MAX6166BESA+ be used as a direct drop-in replacement for MAX6166BESA? A: Yes. MAX6166BESA+ is electrically identical to MAX6166BESA, with the same 2.5V output, ±0.2% tolerance, 5 mA output current, and 8-SOIC package. The primary difference is active product status and ROHS3 compliance. No circuit modifications are required.

Q: What are the key differences between MAX6166BESA and ADR291 series parts? A: The ADR291 series offers superior specifications: tighter output tolerance (±0.08% to ±0.24% vs. ±0.2%), lower noise (8µVp-p vs. 27µVp-p), significantly reduced supply current (15µA vs. 120µA), and extended temperature range (-40°C to 125°C vs. -40°C to 85°C). All ADR291 variants maintain the same 2.5V output and 5 mA output current in identical 8-SOIC packages.

Q: Which ADR291 variant should I select? A: Selection depends on accuracy requirements. ADR291ERZ provides the tightest tolerance (±0.08%) for precision applications. ADR291FRZ offers balanced performance (±0.12%) for general-purpose use. ADR291GRZ provides cost-effective operation (±0.24%) where tolerance margins are less critical. ADR291WFRZ-R7 is specified for automotive applications.

Q: Are all substitute parts available in the same 8-SOIC package? A: Yes. All listed substitutes use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring PCB footprint compatibility without layout modifications.

Q: What is the impact of different packaging formats (Tube, CT, TR)? A: Packaging format affects distribution and handling only. Electrical performance and PCB compatibility are identical. Tube suits manual assembly; Cut Tape & Digi-Reel and Tape & Reel formats support automated manufacturing.

Q: Is the ADR291 series backward compatible with MAX6166BESA designs? A: Yes, with consideration for enhanced specifications. ADR291 parts deliver superior performance (lower noise, tighter tolerance, lower supply current) and extended temperature range. Existing designs will function correctly with ADR291 substitutes without circuit changes. The wider input voltage range (3V ~ 15V vs. 2.7V ~ 12.6V) provides additional design flexibility.

Q: Why is MAX6166BESA marked as obsolete? A: Obsolete status indicates the part is no longer in active production. MAX6166BESA+ provides continuity for existing designs, while ADR291 series parts represent the current technology platform for new designs.

Q: What compliance certifications apply to substitute parts? A: MAX6166BESA+ and all ADR291 variants are ROHS3 compliant. All parts carry REACH Unaffected status and EAR99 ECCN classification. The original MAX6166BESA is RoHS non-compliant and should be replaced in applications subject to RoHS directives.

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