LM71CIMFX Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The LM71CIMFX is a digital temperature sensor manufactured by Texas Instruments, designed for local temperature measurement across a -40°C to 150°C range with 13-bit resolution. This component operates via SPI interface with a supply voltage range of 2.65V to 5.5V and features a shutdown mode for power management. The device is packaged in SOT-23-5 (SC-74A) surface mount configuration.

The LM71CIMFX carries an obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this sensor.

Key Parameters

Parameter	Specification
Sensor Type	Digital, Local
Sensing Temperature Range	-40°C ~ 150°C
Resolution	13 bits
Output Interface	SPI
Supply Voltage	2.65V ~ 5.5V
Accuracy	±1.5°C (±2°C to ±3°C across operating range)
Package Type	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount
Features	Shutdown Mode

Substitute Part Grouping Explanation

Substitute parts for the LM71CIMFX are identified based on strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Sensor type: Digital, Local
Temperature sensing range: -40°C ~ 150°C
Resolution: 13 bits
Output interface: SPI
Supply voltage range: 2.65V ~ 5.5V
Accuracy specification: ±1.5°C
Package: SOT-23-5 (SC-74A)
Mounting: Surface Mount
Features: Shutdown Mode

The substitute part LM71CIMFX/NOPB maintains identical electrical specifications and mechanical compatibility with the original LM71CIMFX. The primary distinction is packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete).

Parameter Comparison

Parameter	LM71CIMFX	LM71CIMFX/NOPB	Match Status
Manufacturer	Texas Instruments	Texas Instruments	Identical
Sensor Type	Digital, Local	Digital, Local	Identical
Temperature Range	-40°C ~ 150°C	-40°C ~ 150°C	Identical
Resolution	13 bits	13 bits	Identical
Output Type	SPI	SPI	Identical
Supply Voltage	2.65V ~ 5.5V	2.65V ~ 5.5V	Identical
Accuracy	±1.5°C	±1.5°C	Identical
Package	SOT-23-5	SOT-23-5	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Features	Shutdown Mode	Shutdown Mode	Identical
Product Status	Obsolete	Active	Different
Packaging Format	Bulk	Tape & Reel (TR)	Different
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Different

Engineering Selection Recommendations

The LM71CIMFX/NOPB is the direct functional equivalent of the LM71CIMFX. Both parts share identical electrical performance, temperature measurement capabilities, and physical packaging specifications.

Selection between these parts should be based on the following factors:

Product Status: The LM71CIMFX/NOPB carries Active product status, ensuring ongoing manufacturer support and availability. The original LM71CIMFX is Obsolete, limiting future procurement options.

Compliance Requirements: The LM71CIMFX/NOPB is ROHS3 compliant, whereas the LM71CIMFX is RoHS non-compliant. Applications subject to RoHS regulations or customer requirements must use the LM71CIMFX/NOPB variant.

Packaging Format: The LM71CIMFX/NOPB is supplied in Tape & Reel format, standard for automated assembly processes. The original part is supplied in bulk format. Packaging selection depends on production volume and assembly methodology.

Supply Chain Continuity: For new designs or ongoing production, the LM71CIMFX/NOPB is the recommended selection due to active product status and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can LM71CIMFX/NOPB be used as a direct replacement for LM71CIMFX?

A: Yes. Both parts are electrically and mechanically identical. They share the same temperature measurement range (-40°C to 150°C), resolution (13 bits), SPI interface, supply voltage specifications (2.65V to 5.5V), and SOT-23-5 package. Pin-for-pin compatibility is confirmed.

Q: What is the difference between LM71CIMFX and LM71CIMFX/NOPB?

A: The primary differences are product status (Obsolete versus Active), packaging format (bulk versus Tape & Reel), and RoHS compliance status (non-compliant versus ROHS3 compliant). Electrical and thermal specifications are identical.

Q: Why is the original LM71CIMFX marked as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support. The LM71CIMFX/NOPB variant remains in active production and is the recommended choice for new applications.

Q: Are there any compatibility concerns when switching from LM71CIMFX to LM71CIMFX/NOPB?

A: No compatibility concerns exist. Both parts are pin-compatible, functionally identical, and operate within the same electrical parameters. PCB layout and firmware remain unchanged.

Q: Does the Tape & Reel packaging of LM71CIMFX/NOPB affect performance?

A: No. Tape & Reel packaging is a distribution format only. It does not affect component performance, electrical characteristics, or reliability. This format is standard for automated assembly processes.

Q: Is RoHS3 compliance required for my application?

A: RoHS compliance requirements depend on your application's regulatory jurisdiction and customer specifications. If RoHS compliance is mandatory, LM71CIMFX/NOPB must be selected. The original LM71CIMFX does not meet RoHS requirements.

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