LM84BIMQA Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM84BIMQA 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.

Substiute Parts

LM84BIMQA

Texas InstrumentsIn Stock: 3661LM84BIMQA Datasheet

Current PartRFQ

LM84BIMQA/NOPB

Texas InstrumentsIn Stock: 1906LM84BIMQA/NOPB Datasheet

DirectRFQ

ADM1023ARQZ-REEL

onsemiIn Stock: 3616ADM1023ARQZ-REEL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM84BIMQA is determined by the following critical parameters:

• Sensor Configuration: Digital temperature sensor with local and remote sensing capability
• Temperature Range: Operating range of 0°C to 125°C minimum
• Communication Protocol: SMBus interface compatibility
• Supply Voltage: 3V to 3.6V operating range
• Package Format: 16-pin SSOP surface mount package
• Resolution & Accuracy: 7-bit resolution with ±1°C accuracy specification

Two substitute parts meet these criteria with allowable parameter variations within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

LM84BIMQA/NOPB (Texas Instruments): This direct manufacturer variant maintains identical electrical specifications and package format to the original LM84BIMQA. It provides a pin-compatible replacement with ROHS3 compliance. Product status is obsolete, indicating limited future availability. Selection is appropriate for applications requiring exact electrical and mechanical compatibility with existing designs.

ADM1023ARQZ-REEL (onsemi): This substitute offers active product status with extended supply voltage range (3V to 5.5V) and ROHS3 compliance. The package format differs (16-QSOP versus 16-SSOP), requiring PCB layout modification. Remote sensor accuracy is ±3°C compared to ±1°C on the original part. Temperature range is 0°C to 120°C, which is 5°C lower than the LM84BIMQA maximum. Selection is appropriate for new designs where PCB layout flexibility exists and the reduced remote accuracy and temperature ceiling are acceptable.

Frequently Asked Questions (FAQ)

Q: Can LM84BIMQA/NOPB be used as a direct replacement for LM84BIMQA?

A: Yes. Both parts share identical electrical specifications, 7-bit resolution, ±1°C accuracy, SMBus interface, and 16-SSOP package format. The primary difference is packaging (tube versus reel) and RoHS compliance status. Pin-for-pin substitution is valid without circuit modification.

Q: What are the limitations of ADM1023ARQZ-REEL as a substitute?

A: The ADM1023ARQZ-REEL requires PCB layout changes due to package format difference (16-QSOP instead of 16-SSOP). Remote sensor accuracy is ±3°C versus ±1°C on the original. Maximum operating temperature is 120°C instead of 125°C. Supply voltage range is wider (3V to 5.5V), which may be advantageous in some applications.

Q: Are there pin-compatibility concerns between the LM84BIMQA and ADM1023ARQZ-REEL?

A: No direct pin compatibility exists due to different package formats (SSOP versus QSOP). PCB redesign is required. Functional compatibility exists through SMBus protocol support, but electrical and thermal characteristics differ.

Q: Which substitute is recommended for new product designs?

A: Selection depends on design constraints. For applications requiring exact thermal specifications and 125°C operation, LM84BIMQA/NOPB is appropriate if availability can be secured. For new designs with layout flexibility and active product status priority, ADM1023ARQZ-REEL is suitable if the reduced remote accuracy and 120°C maximum temperature are acceptable.

Q: What is the impact of RoHS compliance on part selection?

A: LM84BIMQA is RoHS non-compliant. Both substitutes (LM84BIMQA/NOPB and ADM1023ARQZ-REEL) are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the compliant substitutes are mandatory.