DS75S Temperature Sensor Equivalent & Substitute Parts

Part Overview

The DS75S 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 interface. The device is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and new production requirements. This reference provides direct equivalents and functional alternatives that maintain compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	DS75S Value
Sensor Type	Digital, Local
Sensing Temperature Range	-55°C ~ 125°C
Output Type	I2C
Supply Voltage	2.7V ~ 5.5V
Resolution	11 bits
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
Product Status	Obsolete
RoHS Compliance	Non-compliant

Substitute Part Grouping Explanation

Substitute parts are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Sensing temperature range: -55°C ~ 125°C minimum
Output interface: I2C or I2C/SMBus compatible
Supply voltage: 2.7V ~ 5.5V
Package: 8-SOIC form factor
Resolution: 11-bit or higher
Accuracy: ±2°C or better within the operating range

Grouping Logic:

Direct Equivalents maintain identical electrical specifications and can serve as pin-compatible replacements with no design modifications required.

Functional Alternatives meet or exceed the core electrical parameters but may offer enhanced features (higher resolution, improved accuracy, or additional functionality) while maintaining the same package and interface compatibility.

Upgrade Options provide superior performance characteristics such as higher resolution or improved accuracy while maintaining backward compatibility with the original application requirements.

Parameter Comparison

Part Number	Manufacturer	Status	Temp Range	Output Type	Resolution	Accuracy	Supply Voltage	Package	RoHS
DS75S	Analog Devices/Maxim	Obsolete	-55°C ~ 125°C	I2C	11 b	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	Non-compliant
DS75S+	Analog Devices/Maxim	Active	-55°C ~ 125°C	I2C	11 b	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
TMP75AID	Texas Instruments	Obsolete	-55°C ~ 127°C	I2C/SMBus	11 b	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
TMP275AID	Texas Instruments	Obsolete	-55°C ~ 127°C	SMBus	11 b	±0.5°C / ±1.5°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
TMP275AIDR	Texas Instruments	Active	-55°C ~ 127°C	SMBus	11 b	±0.5°C / ±1.5°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
ADT75ARZ	Analog Devices	Active	-55°C ~ 125°C	I2C/SMBus	12 b	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
ADT75ARZ-REEL	Analog Devices	Active	-55°C ~ 125°C	I2C/SMBus	12 b	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
ADT75ARZ-REEL7	Analog Devices	Active	-55°C ~ 125°C	I2C/SMBus	12 b	±2°C / ±3°C	2.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
AT30TS74-SS8M-B	Microchip Technology	Active	-55°C ~ 125°C	I2C/SMBus	11 b	±2°C / ±3°C	1.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
AT30TS74-SS8M-T	Microchip Technology	Active	-55°C ~ 125°C	I2C/SMBus	11 b	±2°C / ±3°C	1.7V ~ 5.5V	8-SOIC	ROHS3 Compliant
AT30TS750A-SS8M-B	Microchip Technology	Active	-55°C ~ 125°C	I2C/SMBus	11 b	±1°C / ±3°C	1.7V ~ 5.5V	8-SOIC	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (No Design Changes): DS75S+ is the primary direct equivalent. It maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance, eliminating the obsolescence risk associated with the original DS75S.

For New Designs and RoHS-Compliant Applications: ADT75ARZ, ADT75ARZ-REEL, or ADT75ARZ-REEL7 are recommended. These parts provide 12-bit resolution (enhanced from 11-bit), maintain the full -55°C to 125°C temperature range, support both I2C and SMBus protocols, and carry active product status with ROHS3 compliance. The ADT75ARZ variants differ only in packaging format (Tube vs. Cut Tape & Digi-Reel).

For Applications Requiring Extended Supply Voltage Range: AT30TS74-SS8M-B or AT30TS74-SS8M-T support supply voltages from 1.7V to 5.5V, compared to the DS75S minimum of 2.7V. These Microchip parts maintain 11-bit resolution, -55°C to 125°C range, and equivalent accuracy while offering active status and ROHS3 compliance.

For Superior Accuracy Requirements: AT30TS750A-SS8M-B provides ±1°C accuracy in the 0°C to 85°C range (compared to ±2°C for DS75S), includes integrated EEPROM functionality, and maintains all other compatibility parameters. This option suits applications where enhanced thermal measurement precision is beneficial.

For Texas Instruments Ecosystem Integration: TMP275AIDR offers SMBus compatibility with superior accuracy (±0.5°C in the -20°C to 100°C range) and active product status. This represents an upgrade path for applications where TI component standardization is preferred.

Frequently Asked Questions (FAQ)

Q: Can DS75S+ be used as a direct pin-for-pin replacement for DS75S? A: Yes. DS75S+ maintains identical pinout, electrical specifications, and mechanical package dimensions. The primary difference is active product status and ROHS3 compliance. No circuit modifications are required.

Q: What is the key difference between ADT75ARZ variants (ADT75ARZ, ADT75ARZ-REEL, ADT75ARZ-REEL7)? A: All three variants are electrically identical. The differences are packaging formats: ADT75ARZ ships in Tube packaging, while ADT75ARZ-REEL and ADT75ARZ-REEL7 use Cut Tape & Digi-Reel format. Selection depends on assembly line requirements and tape specifications.

Q: Are TMP275AIDR and TMP75AID interchangeable with DS75S? A: TMP75AID is functionally compatible but obsolete. TMP275AIDR is compatible and active, but uses SMBus output instead of I2C. Verify firmware compatibility with SMBus protocol before substitution. Both support the full -55°C to 125°C range and equivalent accuracy.

Q: Does the 12-bit resolution of ADT75ARZ provide measurable advantages over the 11-bit DS75S? A: ADT75ARZ provides 0.0625°C resolution per LSB compared to 0.125°C for 11-bit devices. This enhanced resolution is beneficial for precision temperature monitoring but requires firmware capable of processing 12-bit data. Accuracy remains ±2°C to ±3°C, unchanged from DS75S.

Q: Which substitute part offers the lowest supply voltage requirement? A: AT30TS74-SS8M-B and AT30TS74-SS8M-T support minimum supply voltage of 1.7V, compared to 2.7V for DS75S. This is relevant for battery-powered or low-voltage applications.

Q: Is ROHS3 compliance mandatory for DS75S replacement? A: ROHS3 compliance is not mandatory for direct replacement but is required for new designs and applications subject to EU regulations. All recommended active substitutes carry ROHS3 compliance.

Q: Can AT30TS750A-SS8M-B be used in applications requiring only temperature sensing without EEPROM functionality? A: Yes. The integrated EEPROM is an additional feature that does not interfere with basic temperature sensing operation. The part functions as a standard temperature sensor when EEPROM features are not utilized.

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