MAX6667AUT Equivalent & Substitute Parts

Part Overview

The MAX6667AUT is a digital temperature sensor manufactured by Analog Devices Inc./Maxim Integrated, designed for local temperature monitoring across the -40°C to 125°C range. This component operates with PWM output and supports supply voltages from 3V to 5.5V in a SOT-23-6 surface mount package. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	MAX6667AUT
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete
Sensor Type	Digital, Local
Sensing Temperature Range	-40°C ~ 125°C
Output Type	PWM
Supply Voltage	3V ~ 5.5V
Accuracy	±1°C (±6°C at -40°C)
Operating Temperature	-40°C ~ 150°C
Package	SOT-23-6
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX6667AUT is determined by the following critical parameters:

Temperature Sensing Range: -40°C to 125°C minimum coverage
Output Interface: Digital output capability for system integration
Supply Voltage Compatibility: Operating range must accommodate system power requirements
Package Form Factor: Surface mount configuration for PCB integration
Accuracy Specification: Temperature measurement precision within acceptable tolerance
Product Status: Active availability for procurement and long-term support

The substitute parts identified (MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB) meet these core substitution criteria. All three variants are manufactured by Microchip Technology and share identical electrical and functional specifications, differing only in packaging format (Cut Tape, Tape & Reel configurations).

Parameter Comparison

Parameter	MAX6667AUT	MCP9844T-BE/MNY	MCP9844T-BE/MNYAA	MCP9844T-BE/MNYAB
Manufacturer	Analog Devices Inc./Maxim Integrated	Microchip Technology	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Sensor Type	Digital, Local	Internal	Internal	Internal
Sensing Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Output Type	PWM	2-Wire Serial, I2C	2-Wire Serial, I2C	2-Wire Serial, I2C
Supply Voltage	3V ~ 5.5V	1.7V ~ 3.6V	1.7V ~ 3.6V	1.7V ~ 3.6V
Accuracy	±1°C (±6°C at -40°C)	±3°C (Max)	±3°C (Max)	±3°C (Max)
Operating Temperature	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package	SOT-23-6	8-WFDFN Exposed Pad	8-WFDFN Exposed Pad	8-WFDFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Product Status Consideration: The MAX6667AUT is obsolete, necessitating transition to active alternatives. All three MCP9844T variants are in active production status, ensuring long-term availability and supply chain continuity.

Compliance & Certifications: Both the original part and all substitute options maintain ROHS3 compliance and MSL Level 1 rating, supporting deployment in regulated environments without additional qualification requirements.

Packaging Transition: The substitute parts utilize 8-WFDFN Exposed Pad packaging instead of the original SOT-23-6 form factor. This represents a physical redesign requirement at the PCB level but maintains surface mount assembly compatibility.

Output Interface Change: The MCP9844T series implements 2-Wire Serial I2C output in place of PWM. System firmware and interface circuitry must be adapted to accommodate this protocol change.

Supply Voltage Range: The MCP9844T series operates at 1.7V to 3.6V, which is narrower than the MAX6667AUT range of 3V to 5.5V. System power supply specifications must be verified for compatibility.

Temperature Accuracy: The substitute parts specify ±3°C maximum accuracy compared to the original ±1°C specification. Applications requiring higher precision must evaluate this tolerance change against system requirements.

Frequently Asked Questions (FAQ)

Q: Can MCP9844T parts directly replace MAX6667AUT without circuit modifications?

A: No. The output interface differs fundamentally—MAX6667AUT uses PWM output while MCP9844T uses I2C serial communication. Interface circuitry and firmware must be redesigned. Additionally, the package form factor changes from SOT-23-6 to 8-WFDFN, requiring PCB layout modifications.

Q: What is the key difference between MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, and MCP9844T-BE/MNYAB?

A: These three part numbers represent identical electrical and functional specifications. The differences are packaging formats: MCP9844T-BE/MNY is supplied in Cut Tape format, MCP9844T-BE/MNYAA in Tape & Reel format, and MCP9844T-BE/MNYAB in an unspecified packaging configuration. Selection depends on procurement and assembly requirements.

Q: Is the temperature sensing range compatible between MAX6667AUT and MCP9844T?

A: Both parts cover -40°C to 125°C. However, the MAX6667AUT operates to 150°C while MCP9844T is rated to 125°C maximum. Applications requiring operation above 125°C cannot use the MCP9844T as a substitute.

Q: How does the accuracy difference affect system performance?

A: MAX6667AUT provides ±1°C accuracy while MCP9844T specifies ±3°C maximum. This represents a 3x tolerance increase. Applications with tight temperature control requirements must evaluate whether this accuracy degradation is acceptable.

Q: Are there supply voltage compatibility issues?

A: Yes. MAX6667AUT operates from 3V to 5.5V while MCP9844T operates from 1.7V to 3.6V. Systems using 5V supplies cannot directly power MCP9844T without voltage regulation. Verify system power architecture before substitution.

Q: Do all three MCP9844T variants have identical electrical performance?

A: Yes. MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, and MCP9844T-BE/MNYAB share identical electrical specifications, accuracy, temperature range, and output characteristics. Packaging format is the only distinguishing factor.

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