ADT7461AR Equivalent & Substitute Parts

Part Overview

The ADT7461AR is a digital temperature sensor manufactured by onsemi, designed for local and remote temperature monitoring applications. It features SMBus output, programmable limits, and operates across a -40°C to 120°C local sensing range with remote sensing capability to 150°C. The device is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

ADT7461AR

onsemiIn Stock: 2486ADT7461AR Datasheet

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LM63CIMA/NOPB

Texas InstrumentsIn Stock: 2231LM63CIMA/NOPB Datasheet

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LM63CIMAX/NOPB

Texas InstrumentsIn Stock: 18251LM63CIMAX/NOPB Datasheet

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LM63DIMA/NOPB

Texas InstrumentsIn Stock: 1655LM63DIMA/NOPB Datasheet

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LM63DIMAX/NOPB

Texas InstrumentsIn Stock: 1541LM63DIMAX/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ADT7461AR is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Communication Protocol: The ADT7461AR uses SMBus output. Substitute parts must support 2-Wire SMBus protocol for direct firmware and hardware compatibility.

Sensor Configuration: The ADT7461AR provides local and remote temperature sensing. Substitute parts must offer internal and external sensor capability to maintain functional equivalence.

Accuracy Specification: The ±3°C accuracy requirement must be maintained across the operating temperature range.

Supply Voltage Range: While the ADT7461AR operates at 3V ~ 5.5V, substitute parts operating at 3V ~ 3.6V are acceptable for systems designed within this narrower range, provided voltage regulation is confirmed in the application circuit.

The Texas Instruments LM63 series parts (LM63CIMA/NOPB, LM63CIMAX/NOPB, LM63DIMA/NOPB, LM63DIMAX/NOPB) meet these substitution criteria through identical package, SMBus protocol support, dual-sensor architecture, and matching accuracy specifications.

Parameter Comparison

Engineering Selection Recommendations

For New Designs: LM63CIMAX/NOPB or LM63DIMAX/NOPB are preferred selections. Both parts carry Active product status, ensuring long-term availability and manufacturing support. Both are ROHS3 compliant, meeting current environmental and regulatory requirements. LM63CIMAX/NOPB is available in Tape & Reel packaging with 18,200 units in stock, providing superior supply chain stability. LM63DIMAX/NOPB offers equivalent compliance and active status with Tape & Reel packaging and 1,531 units in stock.

For Legacy System Replacement: LM63CIMA/NOPB or LM63DIMA/NOPB may be considered for direct substitution in existing designs. Both are ROHS3 compliant and functionally equivalent to the ADT7461AR. LM63CIMA/NOPB is available in Tube packaging with 2,200 units in stock. LM63DIMA/NOPB is available in Tube packaging with 1,630 units in stock. Note that both carry Obsolete product status.

Supply Voltage Consideration: The ADT7461AR operates at 3V ~ 5.5V, while all LM63 substitutes operate at 3V ~ 3.6V. Applications requiring the full 5.5V upper limit of the original part require voltage regulation or alternative solutions.

Temperature Range Consideration: The ADT7461AR supports local sensing to -40°C and remote sensing to 150°C. LM63 substitutes support 0°C ~ 125°C sensing range. Applications requiring extended low-temperature operation below 0°C or high-temperature operation above 125°C require alternative component selection.

Frequently Asked Questions (FAQ)

Q: Can LM63 series parts directly replace the ADT7461AR without PCB modifications?

A: Yes, for applications operating within 0°C ~ 125°C temperature range and 3V ~ 3.6V supply voltage. The identical 8-SOIC package and SMBus protocol enable direct substitution. Applications requiring the ADT7461AR's extended temperature range or 5.5V supply voltage require circuit redesign.

Q: What is the difference between LM63CIMA/NOPB and LM63CIMAX/NOPB?

A: Both parts are functionally identical. The primary difference is packaging format: LM63CIMA/NOPB uses Tube packaging, while LM63CIMAX/NOPB uses Tape & Reel (TR) packaging. Tape & Reel is standard for automated assembly processes. LM63CIMAX/NOPB has significantly higher inventory availability (18,200 units vs. 2,200 units).

Q: What is the difference between LM63DIMA/NOPB and LM63DIMAX/NOPB?

A: Both parts are functionally identical. LM63DIMA/NOPB uses Tube packaging with Obsolete status, while LM63DIMAX/NOPB uses Tape & Reel packaging with Active status. LM63DIMAX/NOPB is recommended for new designs due to active product status and long-term availability assurance.

Q: Are all LM63 variants ROHS3 compliant?

A: Yes. All four LM63 substitute parts (LM63CIMA/NOPB, LM63CIMAX/NOPB, LM63DIMA/NOPB, LM63DIMAX/NOPB) carry ROHS3 compliance certification, whereas the ADT7461AR is RoHS non-compliant. This represents an environmental and regulatory improvement in substitution.

Q: Which LM63 variant should be selected for production volume orders?

A: LM63CIMAX/NOPB is the optimal choice for production orders. It combines Active product status, ROHS3 compliance, Tape & Reel packaging suitable for automated assembly, and the highest inventory availability (18,200 units). LM63DIMAX/NOPB is an alternative with equivalent specifications and active status.

Q: Does the narrower supply voltage range of LM63 parts affect system design?

A: The LM63 series operates at 3V ~ 3.6V versus the ADT7461AR's 3V ~ 5.5V. If the original design uses supply voltages above 3.6V, voltage regulation must be added to the LM63 supply pin, or alternative components must be selected. Verify the actual supply voltage in the application circuit before substitution.