DS1775R2/T&R Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The DS1775R2/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 currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. This reference provides direct substitutes and equivalent parts that maintain electrical and mechanical compatibility within the specified parameter constraints.

Substiute Parts

DS1775R2/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 899DS1775R2/T&R Datasheet

Current PartRFQ

DS1775R2+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 4939DS1775R2+T&R Datasheet

DirectRFQ

MCP9844T-BE/MNY

Microchip TechnologyIn Stock: 6644MCP9844T-BE/MNY Datasheet

MFR RecommendedRFQ

MCP9844T-BE/MNYAA

Microchip TechnologyIn Stock: 1241MCP9844T-BE/MNYAA Datasheet

MFR RecommendedRFQ

MCP9844T-BE/MNYAB

Microchip TechnologyIn Stock: 6664MCP9844T-BE/MNYAB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DS1775R2/T&R are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Output Type: I2C serial interface compatibility
• Sensing Temperature Range: Minimum coverage of -55°C to 125°C operational window
• Resolution: 11-bit or higher digital output
• Supply Voltage: Overlap with 2.7V ~ 5.5V range
• Mounting Type: Surface mount configuration
• Package Compatibility: SOT-23-5 or equivalent small-outline form factor
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status

Substitute Categories:

Category 1: Direct Manufacturer Equivalent DS1775R2+T&R maintains identical electrical specifications and packaging as the main part, differing only in product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel® vs. standard tape & reel).

Category 2: Cross-Manufacturer Alternatives MCP9844T-BE series (Microchip Technology) provides I2C-based temperature monitoring with comparable resolution and operating temperature range. These parts operate within a narrower supply voltage window (1.7V ~ 3.6V) and feature internal sensor topology with alarm and fan control outputs. Package format is 8-TDFN (2x3), representing a different but functionally compatible surface-mount configuration.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): DS1775R2+T&R is the primary substitute, offering identical electrical specifications and full compatibility with existing DS1775R2/T&R designs. This part maintains active product status with ROHS3 compliance and REACH unaffected certification. Selection of this part eliminates design modification requirements and ensures parameter-for-parameter equivalence.

For Cross-Manufacturer Substitution: MCP9844T-BE series parts (MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB) provide functional temperature monitoring capability with I2C interface compatibility. These parts are suitable for applications where the narrower supply voltage range (1.7V ~ 3.6V) is acceptable and where the -40°C lower temperature limit meets system requirements. All MCP9844T-BE variants maintain ROHS3 compliance and REACH unaffected status. Packaging differences (8-TDFN vs. SOT-23-5) require PCB layout modification but do not affect electrical functionality.

Compliance Considerations: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original DS1775R2/T&R specification.

Frequently Asked Questions (FAQ)

Q: Can DS1775R2+T&R be used as a direct replacement for DS1775R2/T&R? A: Yes. DS1775R2+T&R maintains identical electrical specifications, resolution, temperature range, supply voltage, accuracy, and package configuration. The only differences are product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel® vs. standard tape & reel), which do not affect functional compatibility.

Q: What are the key differences between DS1775R2/T&R and MCP9844T-BE series? A: The primary differences are: (1) Supply voltage range—DS1775R2/T&R operates at 2.7V ~ 5.5V while MCP9844T-BE operates at 1.7V ~ 3.6V; (2) Minimum sensing temperature—DS1775R2/T&R covers -55°C while MCP9844T-BE covers -40°C; (3) Package format—DS1775R2/T&R uses SOT-23-5 while MCP9844T-BE uses 8-TDFN (2x3); (4) Sensor topology—DS1775R2/T&R is local sensor while MCP9844T-BE is internal sensor. Both maintain I2C output compatibility and ROHS3 compliance.

Q: Are MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, and MCP9844T-BE/MNYAB electrically identical? A: Yes. These three MCP9844T-BE variants share identical electrical specifications, resolution, temperature range, supply voltage, accuracy, and package configuration. Differences are limited to packaging format (Cut Tape & Digi-Reel® vs. Tape & Reel vs. unspecified packaging).

Q: What supply voltage considerations apply when selecting MCP9844T-BE substitutes? A: MCP9844T-BE series operates at 1.7V ~ 3.6V, which is narrower than the DS1775R2/T&R range of 2.7V ~ 5.5V. Systems designed for the full 2.7V ~ 5.5V range must verify that operating voltage remains within 1.7V ~ 3.6V when using MCP9844T-BE parts. The overlap range of 2.7V ~ 3.6V is compatible with both part families.

Q: Does the package change from SOT-23-5 to 8-TDFN affect I2C communication? A: No. Package format changes do not affect I2C serial communication protocol or electrical interface. However, PCB layout and footprint design must be modified to accommodate the different package geometry (SOT-23-5 vs. 8-TDFN).

Q: Are all substitute parts ROHS3 compliant? A: Yes. DS1775R2+T&R and all MCP9844T-BE variants (MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB) maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original DS1775R2/T&R part.