LM76CHM-5 Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM76CHM-5 is a digital temperature sensor manufactured by Texas Instruments, designed for local temperature measurement in the range of -20°C to 85°C with 12-bit resolution and I2C output interface. The device operates on a 4.5V to 5.5V supply and is packaged in an 8-SOIC form factor. This part is classified as "Not For New Designs," making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LM76CHM-5

Texas InstrumentsIn Stock: 2034LM76CHM-5 Datasheet

Current PartRFQ

LM76CHM-5/NOPB

National SemiconductorIn Stock: 1635LM76CHM-5/NOPB Datasheet

DirectRFQ

MCP9844T-BE/MNY

Microchip TechnologyIn Stock: 6644MCP9844T-BE/MNY Datasheet

MFR RecommendedRFQ

MCP9844T-BE/MNYAA

Microchip TechnologyIn Stock: 1241MCP9844T-BE/MNYAA Datasheet

MFR RecommendedRFQ

MCP9844T-BE/MNYAB

Microchip TechnologyIn Stock: 6664MCP9844T-BE/MNYAB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM76CHM-5 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Output interface type (I2C serial communication)
• Temperature sensing range coverage (minimum -20°C to 85°C)
• Resolution (12-bit minimum)
• Supply voltage compatibility (4.5V to 5.5V operation)
• Package form factor (8-pin surface mount)
• Functional features (programmable limits, shutdown capability)

Substitute Classification:

Direct Equivalent: LM76CHM-5/NOPB maintains identical electrical specifications, temperature range, resolution, and I2C interface. This part is manufactured by National Semiconductor and carries Active product status, making it suitable for direct replacement in existing designs.

Functional Alternatives: The MCP9844T-BE series (MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB) manufactured by Microchip Technology provides I2C interface compatibility and internal temperature sensing capability. These parts operate across an extended temperature range (-40°C to 125°C) and feature 2-Wire Serial I2C output with alarm and fan control outputs. However, they require supply voltage in the 1.7V to 3.6V range and utilize an 8-TDFN package form factor rather than 8-SOIC.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement in Existing Designs:

Select LM76CHM-5/NOPB when maintaining compatibility with existing PCB layouts and supply voltage infrastructure. This part carries Active product status and maintains identical electrical and thermal specifications to the original LM76CHM-5, ensuring no design modifications are required.

For New Designs with Extended Temperature Range Requirements:

The MCP9844T-BE series (MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB) is suitable when system requirements include operation beyond the -20°C to 85°C range. All three variants are ROHS3 compliant and carry Active product status. Selection among these three variants depends on packaging requirements (Cut Tape, Tape & Reel, or standard packaging).

Supply Voltage Consideration:

The MCP9844T-BE series requires supply voltage in the 1.7V to 3.6V range, which differs from the LM76CHM-5 requirement of 4.5V to 5.5V. System power architecture modifications are necessary if selecting MCP9844T-BE variants.

Package Form Factor:

The MCP9844T-BE series utilizes 8-TDFN packaging, which differs from the 8-SOIC form factor of the LM76CHM-5. PCB layout redesign is required for MCP9844T-BE implementation.

Compliance Status:

MCP9844T-BE variants provide ROHS3 compliance, addressing environmental regulatory requirements not met by the original LM76CHM-5.

Frequently Asked Questions (FAQ)

Q: Can LM76CHM-5/NOPB be used as a direct drop-in replacement for LM76CHM-5?

A: Yes. LM76CHM-5/NOPB maintains identical electrical specifications, temperature range, resolution, I2C interface, and 8-SOIC package form factor. No design modifications are required for direct substitution.

Q: What are the key differences between LM76CHM-5 and MCP9844T-BE series?

A: The primary differences are supply voltage range (4.5V-5.5V versus 1.7V-3.6V), package type (8-SOIC versus 8-TDFN), accuracy specification (±0.5°C versus ±3°C), and extended operating temperature range (-40°C to 125°C for MCP9844T-BE). The MCP9844T-BE series includes additional features such as alarm and fan control outputs.

Q: Is the MCP9844T-BE series suitable for applications requiring the exact -20°C to 85°C temperature range of the LM76CHM-5?

A: Yes. The MCP9844T-BE series operating range of -40°C to 125°C encompasses the -20°C to 85°C requirement. However, the lower accuracy specification (±3°C maximum versus ±0.5°C) must be evaluated against application tolerance requirements.

Q: What packaging options are available for the MCP9844T-BE series?

A: Three packaging variants are available: MCP9844T-BE/MNY (Cut Tape & Digi-Reel), MCP9844T-BE/MNYAA (Tape & Reel), and MCP9844T-BE/MNYAB (standard packaging). All utilize 8-TDFN (2x3) form factor.

Q: Are there RoHS compliance differences between these parts?

A: Yes. The LM76CHM-5 is RoHS non-compliant. LM76CHM-5/NOPB compliance status is not specified. All MCP9844T-BE variants (MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB) are ROHS3 compliant.

Q: What is the impact of the different package types on PCB design?

A: The LM76CHM-5 and LM76CHM-5/NOPB use 8-SOIC (0.154", 3.90mm width) packaging. The MCP9844T-BE series uses 8-TDFN (2x3) packaging. These are physically different form factors requiring separate PCB footprints and layout designs.