DS75S/T&R Equivalent & Substitute Parts

Part Overview

The DS75S/T&R is a digital temperature sensor manufactured by Analog Devices Inc./Maxim Integrated, designed for local temperature measurement across the -55°C to 125°C range with 11-bit resolution and I2C output. The device is packaged in 8-SOIC surface mount configuration and operates on 2.7V to 5.5V supply voltage.

The DS75S/T&R is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Direct alternatives with matching or enhanced specifications are available from multiple manufacturers.

Key Parameters

Parameter	DS75S/T&R Value
Sensor Type	Digital, Local
Sensing Temperature Range	-55°C ~ 125°C
Output Type	I2C
Resolution	11 bits
Supply Voltage	2.7V ~ 5.5V
Accuracy	±2°C (-25°C ~ 100°C), ±3°C (-55°C ~ 125°C)
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 8-SOIC surface mount package (0.154", 3.90mm Width)
Temperature Range: Minimum coverage of -55°C to 125°C operating range
Output Protocol: I2C or I2C/SMBus compatible interface
Supply Voltage: 2.7V to 5.5V operating range
Resolution: 9 bits or higher
Accuracy: ±2°C to ±3°C within specified test conditions

Substitute parts are categorized as follows:

Direct Equivalents maintain identical electrical and mechanical specifications with improved product status or packaging options.

Manufacturer Recommended Alternatives provide enhanced specifications (higher resolution, improved accuracy, or expanded feature sets) while maintaining core functional compatibility.

Upgrade Options offer superior performance characteristics suitable for applications requiring enhanced precision or extended operating ranges.

Parameter Comparison

Part Number	Manufacturer	Product Status	Temperature Range	Resolution	Output Type	Accuracy	Supply Voltage	Package	RoHS Status
DS75S/T&R	Analog Devices Inc./Maxim Integrated	Obsolete	-55°C ~ 125°C	11 b	I2C	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	Non-compliant
DS75S+T&R	Analog Devices Inc./Maxim Integrated	Active	-55°C ~ 125°C	11 b	I2C	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
LM75AIMX/NOPB	Texas Instruments	Active	-55°C ~ 125°C	9 b	I2C	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
ADT75ARZ	Analog Devices Inc.	Active	-55°C ~ 125°C	12 b	I2C/SMBus	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
ADT75ARZ-REEL	Analog Devices Inc.	Active	-55°C ~ 125°C	12 b	I2C/SMBus	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
ADT75ARZ-REEL7	Analog Devices Inc.	Active	-55°C ~ 125°C	12 b	I2C/SMBus	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
AT30TS74-SS8M-B	Microchip Technology	Active	-55°C ~ 125°C	11 b	I2C/SMBus	±2°C / ±3°C	1.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
AT30TS74-SS8M-T	Microchip Technology	Active	-55°C ~ 125°C	11 b	I2C/SMBus	±2°C / ±3°C	1.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
AT30TS750A-SS8M-B	Microchip Technology	Active	-55°C ~ 125°C	11 b	I2C/SMBus	±1°C / ±3°C	1.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
TMP275AID	Texas Instruments	Obsolete	-40°C ~ 125°C	11 b	SMBus	±0.5°C / ±1.5°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
TMP275AIDR	Texas Instruments	Active	-40°C ~ 125°C	11 b	SMBus	±0.5°C / ±1.5°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Direct Equivalent: DS75S+T&R is the primary replacement for DS75S/T&R. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance, eliminating obsolescence risk and regulatory concerns.

Recommended Manufacturer Alternatives: ADT75ARZ, ADT75ARZ-REEL, and ADT75ARZ-REEL7 are manufacturer-recommended alternatives from Analog Devices Inc. These parts provide 12-bit resolution (versus 11-bit in the original) and I2C/SMBus compatibility, maintaining the same accuracy specification and temperature range. All variants are ROHS3 compliant with active product status.

Alternative from Texas Instruments: LM75AIMX/NOPB provides functional compatibility with 9-bit resolution and I2C output. This part maintains the full -55°C to 125°C temperature range and identical accuracy specifications. ROHS3 compliance and active product status ensure long-term availability.

Enhanced Performance Option: AT30TS750A-SS8M-B from Microchip Technology offers improved accuracy (±1°C at 0°C ~ 85°C) with 11-bit resolution and I2C/SMBus compatibility. Extended supply voltage range (1.7V ~ 5.5V) provides additional design flexibility. ROHS3 compliance and active status support production continuity.

Upgrade Path: TMP275AIDR from Texas Instruments provides superior accuracy (±0.5°C at -20°C ~ 100°C) with 11-bit resolution and SMBus output. This part is suitable for applications requiring enhanced precision. Active product status and ROHS3 compliance ensure supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can DS75S/T&R be directly replaced with DS75S+T&R?

A: Yes. DS75S+T&R is the direct equivalent with identical electrical and mechanical specifications. The primary differences are active product status and ROHS3 compliance. No design modifications are required.

Q: What is the difference between I2C and SMBus output types?

A: SMBus is a subset of I2C protocol with additional timing and electrical specifications. I2C-only devices are compatible with SMBus systems, but SMBus devices may include additional features. All substitute parts listed maintain protocol compatibility with the original DS75S/T&R I2C interface.

Q: Does resolution difference affect compatibility?

A: Resolution differences do not prevent functional substitution. The DS75S/T&R uses 11-bit resolution. Substitute parts with 9-bit resolution (LM75AIMX/NOPB) provide reduced precision but maintain accuracy specifications. Parts with 12-bit resolution (ADT75ARZ series) provide enhanced precision without affecting compatibility.

Q: Are there supply voltage considerations for substitution?

A: All listed substitute parts operate within the 2.7V to 5.5V range specified for the original part. AT30TS74 and AT30TS750A variants support extended lower voltage operation (1.7V minimum), providing additional design flexibility without affecting standard 2.7V to 5.5V applications.

Q: What packaging options are available?

A: All substitute parts use 8-SOIC surface mount package (0.154", 3.90mm Width) matching the original. Packaging variants include Tube and Cut Tape (CT) & Digi-Reel® options. Selection depends on procurement and assembly requirements.

Q: Is RoHS compliance mandatory for substitution?

A: The original DS75S/T&R is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant. For applications subject to RoHS regulations, ROHS3 compliant alternatives are required. For legacy systems without RoHS requirements, non-compliant parts may be acceptable based on application standards.

Q: Which substitute offers the best accuracy?

A: AT30TS750A-SS8M-B provides ±1°C accuracy at 0°C ~ 85°C, and TMP275AIDR provides ±0.5°C accuracy at -20°C ~ 100°C. Both exceed the original ±2°C / ±3°C specification. Selection depends on specific temperature range and accuracy requirements.

Q: Can TMP275AIDR be used if the application requires -55°C operation?

A: TMP275AIDR operates to -40°C minimum, not -55°C. This part is unsuitable for applications requiring full -55°C to 125°C coverage. Use DS75S+T&R, ADT75ARZ series, or Microchip AT30TS74/AT30TS750A variants for complete temperature range compatibility.

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