AT30TS75-SS8-B Equivalent & Substitute Parts

Part Overview

The AT30TS75-SS8-B is a digital temperature sensor manufactured by Microchip Technology, designed for local temperature measurement across the -55°C to 125°C range with 11-bit resolution and I2C/SMBus interface. The device is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance. This reference provides qualified substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	AT30TS75-SS8-B
Sensor Type	Digital, Local
Sensing Temperature Range	-55°C ~ 125°C
Output Type	I2C/SMBus
Supply Voltage	2.7V ~ 5.5V
Resolution	11 bits
Accuracy (Best/Worst)	±1.5°C / ±3°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Compatibility Criteria:

Sensor type: Digital, Local
Temperature sensing range: -55°C ~ 125°C minimum
Output interface: I2C or SMBus compatible
Package: 8-SOIC form factor
Supply voltage overlap: Minimum 2.7V operation required

Secondary Compatibility Factors:

Resolution: 11-bit preferred; 9-bit acceptable with functional equivalence
Accuracy specification: ±2°C or better at nominal test conditions
Mounting type: Surface Mount
RoHS3 compliance

Substitute parts are grouped into two categories: direct Microchip equivalents (AT30TS74-SS8M-B, AT30TS75A-SS8M-B) and cross-manufacturer alternatives (NXP LM75 series, Texas Instruments LM75 series, Analog Devices/Maxim LM75 series). All listed substitutes meet the core electrical and mechanical requirements for functional replacement.

Parameter Comparison

Part Number	Manufacturer	Status	Temp Range	Resolution	Accuracy (Best/Worst)	Supply Voltage	Output Type	Package
AT30TS75-SS8-B	Microchip	Obsolete	-55°C ~ 125°C	11 b	±1.5°C / ±3°C	2.7V ~ 5.5V	I2C/SMBus	8-SOIC
AT30TS74-SS8M-B	Microchip	Active	-55°C ~ 125°C	11 b	±2°C / ±3°C	1.7V ~ 5.5V	I2C/SMBus	8-SOIC
AT30TS75A-SS8M-B	Microchip	Active	-55°C ~ 125°C	11 b	±1°C / ±3°C	1.7V ~ 5.5V	I2C/SMBus	8-SOIC
LM75AD,118	NXP USA Inc.	Active	-55°C ~ 125°C	11 b	±2°C / ±3°C	2.8V ~ 5.5V	I2C	8-SOIC
LM75AIM/NOPB	Texas Instruments	Obsolete	-55°C ~ 125°C	9 b	±2°C / ±3°C	2.7V ~ 5.5V	I2C	8-SOIC
LM75AIMX/NOPB	Texas Instruments	Active	-55°C ~ 125°C	9 b	±2°C / ±3°C	2.7V ~ 5.5V	I2C	8-SOIC
LM75BD,118	NXP USA Inc.	Active	-55°C ~ 125°C	11 b	±2°C / ±3°C	2.8V ~ 5.5V	I2C	8-SOIC
LM75BIM-3+	Analog Devices Inc./Maxim Integrated	Active	-55°C ~ 125°C	9 b	±2°C / ±3°C	3V ~ 5.5V	I2C	8-SOIC
LM75BIM-3/NOPB	Texas Instruments	Obsolete	-55°C ~ 125°C	9 b	±2°C / ±3°C	3V ~ 5.5V	I2C	8-SOIC
LM75BIM-5+	Analog Devices Inc./Maxim Integrated	Active	-55°C ~ 125°C	9 b	±2°C / ±3°C	3V ~ 5.5V	I2C	8-SOIC
LM75BIM-5/NOPB	Texas Instruments	Obsolete	-55°C ~ 125°C	9 b	±2°C / ±3°C	3V ~ 5.5V	I2C	8-SOIC

Engineering Selection Recommendations

Preferred Substitutes (Active Status, Microchip Family): AT30TS75A-SS8M-B and AT30TS74-SS8M-B are the primary recommendations. Both are active products from Microchip Technology with full RoHS3 compliance and REACH unaffected status. AT30TS75A-SS8M-B offers superior accuracy (±1°C best case) and maintains 11-bit resolution. AT30TS74-SS8M-B provides 11-bit resolution with extended lower supply voltage support (1.7V minimum).

Cross-Manufacturer Alternatives (Active Status): LM75AD,118 and LM75BD,118 (NXP USA Inc.) are active products with 11-bit resolution and full compliance certifications. LM75AIMX/NOPB (Texas Instruments) is active with 9-bit resolution. LM75BIM-3+ and LM75BIM-5+ (Analog Devices Inc./Maxim Integrated) are active with 9-bit resolution and extended feature sets.

Obsolete Part Avoidance: LM75AIM/NOPB, LM75BIM-3/NOPB, and LM75BIM-5/NOPB are classified as obsolete and should not be selected for new designs or long-term production requirements.

Compliance Verification: All listed substitutes maintain RoHS3 compliance and REACH unaffected status, consistent with the original AT30TS75-SS8-B specification.

Frequently Asked Questions (FAQ)

Q: Can AT30TS74-SS8M-B replace AT30TS75-SS8-B directly? A: Yes. Both devices share identical temperature sensing range (-55°C ~ 125°C), 11-bit resolution, 8-SOIC package, and I2C/SMBus interface. AT30TS74-SS8M-B is active production status and supports lower supply voltage (1.7V minimum vs. 2.7V). Accuracy specification differs slightly (±2°C vs. ±1.5°C best case).

Q: What is the resolution difference between 11-bit and 9-bit devices? A: 11-bit resolution provides 0.0625°C per LSB; 9-bit resolution provides 0.5°C per LSB. For applications requiring finer temperature discrimination, 11-bit devices (AT30TS75A-SS8M-B, LM75AD,118, LM75BD,118) are specified. 9-bit alternatives are functionally compatible for coarser measurement requirements.

Q: Are NXP LM75 devices compatible with Microchip AT30TS devices? A: Yes, within specified parameters. Both NXP LM75AD,118 and LM75BD,118 maintain -55°C ~ 125°C range, 8-SOIC package, and I2C interface. Supply voltage minimum differs (2.8V vs. 2.7V). Verify system supply voltage compatibility before selection.

Q: Why is supply voltage range important for substitution? A: The original AT30TS75-SS8-B operates from 2.7V minimum. Substitutes with higher minimum voltage (e.g., 3V for LM75BIM series) may not function in systems with lower supply rails. Verify system supply voltage against substitute minimum specification.

Q: Can I use 9-bit resolution devices in place of 11-bit? A: Functionally yes, provided application tolerance permits 0.5°C resolution. 9-bit devices (LM75AIMX/NOPB, LM75BIM series) are I2C compatible and cover the full temperature range. Verify firmware or analog signal processing can accommodate reduced resolution.

Q: What is the significance of "Active" vs. "Obsolete" product status? A: Active products have ongoing manufacturing support, documented availability, and long-term supply assurance. Obsolete products have limited or no manufacturing support. For new designs and production continuity, select active status parts (AT30TS75A-SS8M-B, LM75AD,118, LM75AIMX/NOPB, LM75BIM-3+, LM75BIM-5+).

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, consistent with the original AT30TS75-SS8-B specification.

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