ADT7461ARMZ Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The ADT7461ARMZ is a digital temperature sensor manufactured by onsemi, designed for local and remote temperature monitoring across -40°C to 120°C (local) and -55°C to 150°C (remote) operating ranges. This component features SMBus output, 8-bit resolution, and a compact 8-MSOP surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	ADT7461ARMZ
Manufacturer	onsemi
Sensor Type	Digital, Local/Remote
Sensing Temperature - Local	-40°C ~ 120°C
Sensing Temperature - Remote	-55°C ~ 150°C
Output Type	SMBus
Voltage Supply	3V ~ 5.5V
Resolution	8 bit
Accuracy	±3°C (-40°C ~ 100°C)
Package / Case	8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the ADT7461ARMZ are classified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Sensor Type: Digital, Local/Remote capability
Output Interface: SMBus protocol compatibility
Package / Case: 8-MSOP form factor
Mounting Type: Surface Mount
Supply Voltage Range: Minimum 3V support
Temperature Sensing Capability: Local and remote measurement support

Substitution Categories:

Direct Equivalent (Highest Compatibility): ADT7461ARMZ-R7 maintains identical electrical specifications, package format, and functional features as the original part. This represents a direct replacement with active product status.

Compatible Alternatives (Functional Substitutes): EMC1422-2-ACZL-TR, LM86CIMM/NOPB, LM86CIMMX/NOPB, and LM90CIMMX/NOPB share the core functional requirements (SMBus interface, 8-MSOP package, local/remote sensing, surface mount) but exhibit variations in temperature range, resolution, accuracy, and supply voltage specifications that must be evaluated against application requirements.

Parameter Comparison

Parameter	ADT7461ARMZ	ADT7461ARMZ-R7	EMC1422-2-ACZL-TR	LM86CIMM/NOPB	LM86CIMMX/NOPB	LM90CIMMX/NOPB
Manufacturer	onsemi	onsemi	Microchip Technology	Texas Instruments	Texas Instruments	National Semiconductor
Sensor Type	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote
Sensing Temperature - Local	-40°C ~ 120°C	-40°C ~ 120°C	-40°C ~ 125°C	0°C ~ 85°C	0°C ~ 85°C	0°C ~ 85°C
Sensing Temperature - Remote	-55°C ~ 150°C	-55°C ~ 150°C	-64°C ~ 191°C	0°C ~ 85°C	0°C ~ 85°C	0°C ~ 85°C
Output Type	SMBus	SMBus	SMBus	SMBus	SMBus	SMBus
Voltage - Supply	3V ~ 5.5V	3V ~ 5.5V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Resolution	8 bit	8 bit	11 bit	7 bit (Local), 10 bit (Remote)	7 bit (Local), 10 bit (Remote)	7 bit (Local), 10 bit (Remote)
Accuracy	±3°C	±3°C	±1°C (±2°C)	±3°C	±3°C	±4°C
Package / Case	8-MSOP	8-MSOP	8-MSOP	8-VSSOP	8-VSSOP	8-VSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Obsolete	Active	Active

Engineering Selection Recommendations

ADT7461ARMZ-R7 (Recommended Primary Substitute): This part is the optimal replacement for the obsolete ADT7461ARMZ. It maintains identical electrical specifications, temperature ranges, resolution, accuracy, and package format. The part carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. Selection of this part eliminates design modification requirements.

EMC1422-2-ACZL-TR (Extended Temperature Range Alternative): This Microchip Technology part offers extended remote temperature sensing capability (-64°C ~ 191°C) and superior resolution (11 bit) with improved accuracy (±1°C). However, it operates within a narrower supply voltage range (3V ~ 3.6V) and local temperature range (-40°C ~ 125°C). This part is suitable for applications requiring enhanced measurement precision and extended remote sensing capability, provided supply voltage constraints are acceptable.

LM86CIMMX/NOPB (Active Status Alternative): This Texas Instruments part maintains SMBus compatibility and 8-MSOP package format with active product status. It features reduced local temperature range (0°C ~ 85°C) and narrower supply voltage specification (3V ~ 3.6V) compared to the original part. This option is appropriate for applications operating within the 0°C to 85°C local temperature window.

LM90CIMMX/NOPB (Active Status Alternative): This National Semiconductor part provides SMBus interface and surface mount compatibility with active product status. It exhibits identical temperature range and supply voltage constraints as the LM86CIMMX/NOPB, with slightly reduced accuracy specification (±4°C). Selection requires confirmation that application temperature requirements fall within 0°C to 85°C local sensing range.

LM86CIMM/NOPB (Obsolete Status): This part shares functional characteristics with LM86CIMMX/NOPB but carries obsolete product status. New design implementations should avoid this part in favor of active alternatives.

Frequently Asked Questions (FAQ)

Q: Can ADT7461ARMZ-R7 be used as a direct replacement without design modification?

A: Yes. ADT7461ARMZ-R7 maintains identical electrical specifications, temperature ranges, resolution, accuracy, and 8-MSOP package format. No circuit modifications are required. The part is currently in active production status.

Q: What are the key differences between ADT7461ARMZ and EMC1422-2-ACZL-TR?

A: EMC1422-2-ACZL-TR offers higher resolution (11 bit vs. 8 bit), improved accuracy (±1°C vs. ±3°C), and extended remote temperature range (-64°C ~ 191°C vs. -55°C ~ 150°C). However, it operates within a narrower supply voltage range (3V ~ 3.6V vs. 3V ~ 5.5V) and local temperature range (-40°C ~ 125°C vs. -40°C ~ 120°C). Design evaluation is required to confirm compatibility with these parameter variations.

Q: Why do LM86 and LM90 parts have reduced local temperature range compared to ADT7461ARMZ?

A: LM86 and LM90 series parts are specified for 0°C ~ 85°C local temperature sensing, which is narrower than the ADT7461ARMZ specification of -40°C ~ 120°C. These parts are suitable only for applications operating within the 0°C to 85°C local temperature window. Applications requiring extended low-temperature operation below 0°C must use ADT7461ARMZ-R7 or EMC1422-2-ACZL-TR.

Q: Are all substitute parts compatible with 5V supply voltage?

A: No. EMC1422-2-ACZL-TR, LM86CIMM/NOPB, LM86CIMMX/NOPB, and LM90CIMMX/NOPB are specified for 3V ~ 3.6V supply voltage operation. Only ADT7461ARMZ and ADT7461ARMZ-R7 support the full 3V ~ 5.5V range. Applications requiring 5V operation must use ADT7461ARMZ-R7.

Q: What is the difference between 8-MSOP and 8-VSSOP packages?

A: Both are 8-pin surface mount packages with 0.118" (3.00mm) width. The primary distinction is in pin configuration and thermal characteristics. Physical PCB layout compatibility must be verified before substituting parts with different package designations (MSOP vs. VSSOP).

Q: Which substitute part offers the best accuracy specification?

A: EMC1422-2-ACZL-TR provides the highest accuracy specification at ±1°C (±2°C depending on test condition), compared to ±3°C for ADT7461ARMZ and ADT7461ARMZ-R7, and ±4°C for LM90CIMMX/NOPB. Selection should be based on application accuracy requirements and temperature range constraints.

Q: Are all substitute parts RoHS3 compliant?

A: ADT7461ARMZ-R7, EMC1422-2-ACZL-TR, LM86CIMM/NOPB, and LM86CIMMX/NOPB are confirmed RoHS3 compliant. The original ADT7461ARMZ does not specify RoHS status. All parts carry REACH Unaffected designation.

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