LM84BIMQAX Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM84BIMQAX is a digital temperature sensor manufactured by Texas Instruments, designed for local and remote temperature monitoring applications. It operates across a 0°C to 125°C range with 7-bit resolution and SMBus output interface. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing system designs and maintenance applications. The sensor integrates programmable limit features and output switching capabilities for thermal management systems.

Key Parameters

Parameter	Value
Sensor Type	Digital, Local/Remote
Sensing Temperature Range	0°C ~ 125°C (Local & Remote)
Output Type	SMBus
Supply Voltage	3V ~ 3.6V
Resolution	7 bits
Accuracy	±1°C
Package	16-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Features	Output Switch, Programmable Limit

Substitute Part Grouping Explanation

Substitution eligibility for the LM84BIMQAX is determined by the following critical parameters:

Sensor Type: Must support Digital, Local/Remote temperature monitoring
Temperature Range: Must cover 0°C ~ 125°C for both local and remote sensing
Output Interface: Must use SMBus protocol for system compatibility
Supply Voltage: Must operate within 3V ~ 3.6V range
Resolution: Must maintain 7-bit or higher resolution
Accuracy: Must achieve ±1°C or better
Package: Must use 16-SSOP form factor for PCB compatibility
Features: Must include programmable limit and output switch functionality

Two substitute parts meet these criteria with varying degrees of parameter alignment and product status considerations.

Parameter Comparison

Parameter	LM84BIMQAX (Main)	LM84BIMQAX/NOPB (Direct)	ADM1023ARQZ-REEL (Alternative)
Manufacturer	Texas Instruments	National Semiconductor	onsemi
Sensor Type	Digital, Local/Remote	Digital, Local/Remote	Internal and External
Sensing Temperature - Local	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 120°C
Sensing Temperature - Remote	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 120°C
Output Type	SMBus	SMBus	SMBus
Supply Voltage	3V ~ 3.6V	3V ~ 3.6V	3V ~ 5.5V
Resolution	7 bits	7 bits	Not specified
Accuracy - Local	±1°C	±1°C	±1°C
Accuracy - Remote	±1°C	±1°C	±3°C
Package / Case	16-SSOP	16-SSOP	16-QSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Features	Output Switch, Programmable Limit	Output Switch, Programmable Limit	Output Alarm, Comparator, Multiplexer
Product Status	Discontinued at DiGi Electronics	Active	Active
RoHS Status	Non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

LM84BIMQAX/NOPB (Direct Substitute)

This part is the primary equivalent for the LM84BIMQAX. It maintains identical electrical specifications including sensor type, temperature range, output interface, supply voltage, resolution, and accuracy. The packaging and mounting type are identical. The only difference is packaging format (Bulk vs. Cut Tape) and product status (Active vs. Discontinued). This part is recommended for direct replacement in existing designs without modification.

ADM1023ARQZ-REEL (Alternative Substitute)

This part provides functional substitution with notable parameter differences. It operates across 0°C ~ 120°C (5°C narrower upper range), has reduced remote sensor accuracy (±3°C vs. ±1°C), and uses a different package variant (16-QSOP vs. 16-SSOP). The supply voltage range is broader (3V ~ 5.5V). The part is ROHS3 compliant and actively manufactured. This substitute is suitable only for applications where the narrower temperature range and reduced remote accuracy are acceptable, and where PCB layout can accommodate the 16-QSOP package footprint.

Frequently Asked Questions (FAQ)

Q: Can LM84BIMQAX/NOPB be used as a direct replacement for LM84BIMQAX?

A: Yes. Both parts share identical electrical and functional specifications. The difference is packaging format and product status. LM84BIMQAX/NOPB is actively manufactured and available in bulk packaging.

Q: What are the key differences between LM84BIMQAX and ADM1023ARQZ-REEL?

A: The ADM1023ARQZ-REEL has a narrower temperature range (0°C ~ 120°C vs. 0°C ~ 125°C), reduced remote sensor accuracy (±3°C vs. ±1°C), and uses 16-QSOP packaging instead of 16-SSOP. It offers broader supply voltage tolerance (3V ~ 5.5V) and ROHS3 compliance.

Q: Is the ADM1023ARQZ-REEL suitable for all LM84BIMQAX applications?

A: No. The ADM1023ARQZ-REEL is suitable only for applications where the 0°C ~ 120°C range is sufficient and ±3°C remote accuracy is acceptable. PCB layout must accommodate the 16-QSOP package footprint, which differs from 16-SSOP.

Q: What is the difference between 16-SSOP and 16-QSOP packages?

A: Both are 16-pin surface mount packages with 0.154" width. QSOP (Quarter-Size Small Outline Package) and SSOP (Shrink Small Outline Package) have different pin pitch and body dimensions. PCB footprints are not interchangeable without layout modification.

Q: Why is the LM84BIMQAX discontinued?

A: Product discontinuation is determined by the manufacturer and distributor. The LM84BIMQAX/NOPB remains in active production and serves as the recommended replacement.

Q: Does the ADM1023ARQZ-REEL require firmware changes?

A: Both parts use SMBus interface. Register mapping and command sets may differ. System firmware compatibility must be verified against the ADM1023 datasheet before implementation.

Q: What is the inventory status of substitute parts?

A: LM84BIMQAX/NOPB has 8,637 pieces in stock. ADM1023ARQZ-REEL has 3,554 pieces in stock. Availability is subject to change.

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