LM45BIM3X Equivalent & Substitute Parts

Part Overview

The LM45BIM3X is an analog temperature sensor manufactured by Texas Instruments, designed for local temperature measurement across the -20°C to 100°C range with 10mV/°C output resolution. The device is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the SOT-23-3 package and deliver equivalent analog voltage output characteristics within specified accuracy tolerances.

Substiute Parts

LM45BIM3X

Texas InstrumentsIn Stock: 17630LM45BIM3X Datasheet

Current PartRFQ

LM45BIM3X/NOPB

National SemiconductorIn Stock: 1227LM45BIM3X/NOPB Datasheet

DirectRFQ

DS60R+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 15603DS60R+T&R Datasheet

MFR RecommendedRFQ

MCP9700AT-E/TT

Microchip TechnologyIn Stock: 45486MCP9700AT-E/TT Datasheet

MFR RecommendedRFQ

MCP9700T-E/TT

Microchip TechnologyIn Stock: 99778MCP9700T-E/TT Datasheet

MFR RecommendedRFQ

MCP9701AT-E/TT

Microchip TechnologyIn Stock: 20114MCP9701AT-E/TT Datasheet

MFR RecommendedRFQ

MCP9701T-E/TT

Microchip TechnologyIn Stock: 2326MCP9701T-E/TT Datasheet

MFR RecommendedRFQ

TC1046VNBTR

Microchip TechnologyIn Stock: 1653TC1046VNBTR Datasheet

MFR RecommendedRFQ

TC1047AVNBTR

Microchip TechnologyIn Stock: 38220TC1047AVNBTR Datasheet

MFR RecommendedRFQ

TC1047VNBTR

Microchip TechnologyIn Stock: 6507TC1047VNBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Compatibility Criteria:

• Package format: SOT-23-3 (mandatory)
• Sensor type: Analog, Local (mandatory)
• Output type: Analog Voltage (mandatory)
• Mounting type: Surface Mount (mandatory)

Functional Compatibility Criteria:

• Operating temperature range must encompass or exceed the LM45BIM3X range (-20°C ~ 100°C)
• Resolution and accuracy specifications must support equivalent circuit performance
• Supply voltage range must be compatible with system design constraints

Compliance Considerations:

• RoHS3 compliance status for modern production environments
• REACH and ECCN classifications for regulatory alignment

Substitute parts are grouped into two categories based on functional overlap with the LM45BIM3X specifications:

Category A - Direct Functional Equivalents: Parts with identical or superior temperature range coverage, matching 10mV/°C resolution, and equivalent accuracy specifications.

Category B - Extended Range Alternatives: Parts with expanded temperature ranges or different resolution characteristics that maintain core analog temperature sensing functionality within the SOT-23-3 package.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement Priority:

LM45BIM3X/NOPB maintains identical electrical specifications and temperature range as the original LM45BIM3X. This part is the primary substitute for applications requiring no circuit redesign. Active product status ensures ongoing availability and supply chain stability.

RoHS3 Compliant Alternatives:

For designs requiring modern regulatory compliance, TC1047AVNBTR and TC1047VNBTR deliver equivalent performance with 10mV/°C resolution, ±2°C accuracy, and extended -40°C to 125°C operating range. Both parts maintain SOT-23-3 packaging and analog voltage output. TC1047AVNBTR operates across 2.5V to 5.5V supply range, while TC1047VNBTR is rated 2.7V to 4.4V. Selection depends on system supply voltage constraints.

MCP9700AT-E/TT provides 10mV/°C resolution with extended temperature coverage (-40°C to 125°C) and operates from 2.3V to 5.5V, accommodating lower supply voltage systems. Accuracy specification is ±2°C within the 0°C to 70°C test window.

Extended Temperature Range Applications:

DS60R+T&R and TC1046VNBTR extend operating range to -40°C to 125°C with 6.25mV/°C resolution. These parts are suitable for applications requiring broader temperature coverage but with reduced output resolution compared to the LM45BIM3X.

Lower Supply Voltage Systems:

MCP9700AT-E/TT supports operation from 2.3V, the lowest minimum supply voltage among active substitutes, enabling integration into battery-powered or low-voltage designs.

Frequently Asked Questions (FAQ)

Q: Can LM45BIM3X/NOPB be used as a direct drop-in replacement?

A: Yes. LM45BIM3X/NOPB maintains identical electrical specifications, temperature range (-20°C to 100°C), 10mV/°C resolution, supply voltage (4V to 10V), and SOT-23-3 package. No circuit modifications are required. The part is currently in active production status.

Q: What is the primary difference between TC1047AVNBTR and TC1047VNBTR?

A: Both parts deliver 10mV/°C resolution and ±2°C accuracy across -40°C to 125°C. The difference is supply voltage range: TC1047AVNBTR operates 2.5V to 5.5V, while TC1047VNBTR operates 2.7V to 4.4V. Select based on system supply voltage specifications.

Q: Why do MCP9701 series parts have different resolution (19.5mV/°C) compared to the LM45BIM3X (10mV/°C)?

A: MCP9701AT-E/TT and MCP9701T-E/TT employ different internal scaling, producing 19.5mV/°C output. This higher resolution may require ADC input range recalibration in the application circuit. These parts are suitable only if the design can accommodate the different output scaling.

Q: Are all substitute parts RoHS3 compliant?

A: No. LM45BIM3X/NOPB compliance status is not specified in available data. All Microchip Technology parts (TC1046VNBTR, TC1047AVNBTR, TC1047VNBTR, MCP9700 series, MCP9701 series) and Analog Devices DS60R+T&R are ROHS3 compliant. The original LM45BIM3X is non-compliant.

Q: What is the minimum supply voltage requirement across all substitutes?

A: MCP9700AT-E/TT supports the lowest minimum supply voltage at 2.3V. Most other active substitutes require minimum 2.5V to 2.7V. The original LM45BIM3X requires 4V minimum, making lower-voltage substitutes suitable for reduced-power applications.

Q: Can MCP9700T-E/TT be used where MCP9700AT-E/TT is specified?

A: Both parts share identical temperature range (-40°C to 125°C), 10mV/°C resolution, and supply voltage (2.3V to 5.5V). The difference is accuracy specification: MCP9700AT-E/TT is ±2°C (-2°C, +4°C), while MCP9700T-E/TT is ±2°C (-4°C, +6°C). Selection depends on application accuracy requirements.

Q: Is the SOT-23-3 package identical across all listed parts?

A: Yes. All parts use SOT-23-3 (TO-236-3, SC-59) surface mount package with identical pinout and footprint compatibility. Physical substitution on PCB is feasible without layout modifications.