DS1775R/T&R Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The DS1775R/T&R is a digital temperature sensor manufactured by Analog Devices Inc./Maxim Integrated, designed for local temperature monitoring across the -55°C to 125°C range with 11-bit resolution and I2C output interface. The device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. This reference provides direct substitutes based on matching electrical specifications and mechanical compatibility.

Key Parameters

Parameter	DS1775R/T&R
Sensor Type	Digital, Local
Sensing Temperature Range	-55°C ~ 125°C
Resolution	11 bits
Output Type	I2C
Supply Voltage	2.7V ~ 5.5V
Accuracy	±2°C (-10°C ~ 85°C) / ±3°C (-55°C ~ 125°C)
Operating Temperature	-55°C ~ 125°C
Package	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount
Features	Output Switch, Programmable Limit, Programmable Resolution, Shutdown Mode
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DS1775R/T&R is determined by the following critical parameters:

Output Interface: I2C serial communication protocol
Temperature Sensing Range: Local temperature measurement capability
Supply Voltage Compatibility: Operating voltage window
Package Form Factor: Surface mount footprint compatibility
Resolution and Accuracy: Digital output precision specifications
Compliance Status: RoHS and regulatory certifications

The DS1775R+T&R represents a direct equivalent from the same manufacturer with identical electrical specifications but improved compliance status (ROHS3 Compliant vs. RoHS non-compliant). The MCP9844 series from Microchip Technology provides functional substitution with compatible I2C interface and temperature monitoring capability, though with different package geometry and modified operating parameters.

Parameter Comparison

Parameter	DS1775R/T&R	DS1775R+T&R	MCP9844T-BE/MNY	MCP9844T-BE/MNYAA	MCP9844T-BE/MNYAB
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Microchip Technology	Microchip Technology	Microchip Technology
Sensor Type	Digital, Local	Digital, Local	Internal	Internal	Internal
Output Type	I2C	I2C	2-Wire Serial, I2C	2-Wire Serial, I2C	2-Wire Serial, I2C
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Supply Voltage	2.7V ~ 5.5V	2.7V ~ 5.5V	1.7V ~ 3.6V	1.7V ~ 3.6V	1.7V ~ 3.6V
Accuracy	±2°C / ±3°C	±2°C / ±3°C	±3°C (Max)	±3°C (Max)	±3°C (Max)
Package	SOT-23-5	SOT-23-5	8-TDFN (2x3)	8-TDFN (2x3)	8-TDFN (2x3)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

DS1775R+T&R is the primary direct substitute for DS1775R/T&R. Both devices share identical electrical specifications, I2C interface, and SOT-23-5 package geometry. The DS1775R+T&R is currently in active production status with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original part. No circuit redesign is required for this substitution.

MCP9844T-BE Series (MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB) provides functional substitution with I2C interface compatibility and temperature monitoring capability. These devices require circuit-level evaluation due to differences in package form factor (8-TDFN vs. SOT-23-5), reduced lower temperature limit (-40°C vs. -55°C), and modified supply voltage range (1.7V ~ 3.6V vs. 2.7V ~ 5.5V). All MCP9844 variants maintain ROHS3 compliance and active production status.

Frequently Asked Questions (FAQ)

Q: Can DS1775R+T&R be used as a direct replacement for DS1775R/T&R without circuit modification?

A: Yes. The DS1775R+T&R maintains identical electrical specifications, I2C protocol, pin configuration, and SOT-23-5 package footprint. Direct substitution is possible without circuit redesign.

Q: What are the key differences between DS1775R/T&R and MCP9844T-BE series?

A: The primary differences are package geometry (SOT-23-5 vs. 8-TDFN), minimum operating temperature (-55°C vs. -40°C), and supply voltage range (2.7V ~ 5.5V vs. 1.7V ~ 3.6V). Both devices use I2C interface and provide ±3°C accuracy across the overlapping temperature range. Circuit board layout and power supply design modifications are required for MCP9844 substitution.

Q: Are all MCP9844T-BE variants (MNY, MNYAA, MNYAB) electrically equivalent?

A: Yes. The MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, and MCP9844T-BE/MNYAB variants share identical electrical specifications and differ only in packaging format (Cut Tape & Digi-Reel vs. Tape & Reel configurations). Selection depends on procurement and assembly requirements.

Q: What is the minimum operating temperature consideration when substituting with MCP9844?

A: The MCP9844 series operates from -40°C minimum, compared to DS1775R/T&R at -55°C minimum. Applications requiring temperature monitoring below -40°C cannot use MCP9844 substitutes and must retain DS1775R+T&R or equivalent.

Q: Are all substitute parts RoHS compliant?

A: DS1775R/T&R is RoHS non-compliant. DS1775R+T&R and all MCP9844T-BE variants are ROHS3 compliant, meeting current regulatory requirements for new designs and procurement.

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