ADT7461AARMZ-2RL7 Equivalent & Substitute Parts

Part Overview

The ADT7461AARMZ-2RL7 is a digital temperature sensor manufactured by onsemi, designed for local and remote temperature monitoring across a -40°C to 120°C range. This component features SMBus output, 8-bit resolution, and operates on 3V to 3.6V supply voltage. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring similar functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	ADT7461AARMZ-2RL7
Manufacturer	onsemi
Category	Temperature Sensors
Sensor Type	Digital, Local/Remote
Sensing Temperature - Local	-40°C ~ 120°C
Sensing Temperature - Remote	-64°C ~ 191°C
Output Type	SMBus
Voltage - Supply	3V ~ 3.6V
Resolution	8 b
Features	One-Shot, Output Switch, Programmable Limit, Standby Mode
Accuracy	±1°C (0°C ~ 70°C), ±2.5°C (-40°C ~ 100°C)
Operating Temperature	-40°C ~ 120°C
Mounting Type	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ADT7461AARMZ-2RL7 is determined by the following critical parameters:

Output Interface: SMBus compatibility
Supply Voltage: 3V ~ 3.6V operation
Mounting Type: Surface Mount
Package Compatibility: 8-pin MSOP/VSSOP footprint
Sensor Configuration: Digital, Local/Remote temperature sensing
Core Features: One-Shot, Output Switch, Programmable Limit, Standby/Shutdown Mode

The substitute parts listed below maintain compatibility across these parameters. Temperature range variations and resolution differences are noted in the comparison table, as these may affect application suitability depending on system requirements.

Parameter Comparison

Parameter	ADT7461AARMZ-2RL7	LM86CIMM/NOPB	LM86CIMMX/NOPB	LM90CIMM/NOPB	LM90CIMMX/NOPB
Manufacturer	onsemi	Texas Instruments	Texas Instruments	National Semiconductor	National Semiconductor
Sensor Type	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote
Sensing Temperature - Local	-40°C ~ 120°C	0°C ~ 85°C	0°C ~ 85°C	0°C ~ 85°C	0°C ~ 85°C
Sensing Temperature - Remote	-64°C ~ 191°C	0°C ~ 85°C	0°C ~ 85°C	0°C ~ 85°C	0°C ~ 85°C
Output Type	SMBus	SMBus	SMBus	SMBus	SMBus
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Resolution	8 b	7 b (Local), 10 b (Remote)	7 b (Local), 10 b (Remote)	7 b (Local), 10 b (Remote)	7 b (Local), 10 b (Remote)
Features	One-Shot, Output Switch, Programmable Limit, Standby Mode	One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode	One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode	One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode	One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode
Accuracy	±1°C (0°C ~ 70°C), ±2.5°C (-40°C ~ 100°C)	±3°C	±3°C	±4°C	±4°C
Operating Temperature	-40°C ~ 120°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP
Product Status	Obsolete	Obsolete	Active	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified	Not specified

Engineering Selection Recommendations

LM86CIMMX/NOPB (Texas Instruments) is the primary recommended substitute. This part is currently in active production status, ensuring long-term availability and supply chain stability. It maintains full SMBus compatibility, identical supply voltage range (3V ~ 3.6V), and equivalent 8-pin MSOP package footprint. The LM86CIMMX/NOPB offers RoHS3 compliance, providing environmental regulatory alignment for new designs. Resolution differences (7-bit local, 10-bit remote versus 8-bit) and accuracy variation (±3°C versus ±1°C) must be evaluated against specific application temperature range requirements.

LM90CIMMX/NOPB (National Semiconductor) serves as a secondary alternative, also in active production. This part provides identical electrical interface compatibility and package specifications. The ±4°C accuracy specification represents a trade-off compared to the primary recommendation.

LM86CIMM/NOPB (Texas Instruments) is functionally equivalent to LM86CIMMX/NOPB but carries obsolete product status, limiting its suitability for new designs requiring long-term component availability.

LM90CIMM/NOPB (National Semiconductor) is functionally equivalent to LM90CIMMX/NOPB but carries active product status with bulk packaging. This option is suitable where supply chain continuity is prioritized.

All substitute parts operate within the 0°C to 125°C range, which encompasses the original part's local sensing range of -40°C to 120°C for most industrial applications. Applications requiring extended low-temperature operation below 0°C must account for this limitation.

Frequently Asked Questions (FAQ)

Q: Can LM86CIMMX/NOPB directly replace ADT7461AARMZ-2RL7 in existing designs?

A: Yes, for applications operating within 0°C to 85°C local sensing range. The SMBus interface, supply voltage (3V ~ 3.6V), and 8-pin MSOP package are fully compatible. Applications requiring the original part's extended -40°C to 120°C range must evaluate whether the substitute's 0°C to 85°C range meets system requirements.

Q: What is the difference between LM86 and LM90 series substitutes?

A: Both series maintain SMBus compatibility and identical package specifications. The primary difference is accuracy specification: LM86 series specifies ±3°C accuracy, while LM90 series specifies ±4°C accuracy. Resolution also differs: LM86 offers 7-bit local and 10-bit remote resolution, while the original ADT7461AARMZ-2RL7 provides 8-bit resolution.

Q: Why is LM86CIMMX/NOPB recommended over LM90CIMMX/NOPB?

A: LM86CIMMX/NOPB offers superior accuracy (±3°C versus ±4°C) and includes RoHS3 compliance certification. Both parts are in active production and maintain identical electrical and mechanical compatibility.

Q: Are there package compatibility concerns when substituting?

A: All substitute parts use 8-pin MSOP/VSSOP packages with 0.118" (3.00mm) width, matching the original ADT7461AARMZ-2RL7 footprint. No PCB layout modifications are required for package substitution.

Q: What is the impact of resolution differences on system performance?

A: The original part provides 8-bit resolution. Substitute parts offer 7-bit local and 10-bit remote resolution. For local temperature sensing, this represents a reduction in resolution granularity. System firmware must accommodate this difference if temperature measurement precision is critical to application function.

Q: Should I prioritize active or obsolete product status when selecting a substitute?

A: Active product status (LM86CIMMX/NOPB, LM90CIMMX/NOPB) is recommended for new designs and long-term production requirements, ensuring sustained component availability and supply chain stability. Obsolete parts should be reserved for legacy system maintenance only.

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