LM35CZ Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM35CZ is an analog temperature sensor manufactured by Texas Instruments, designed for local temperature measurement across the -40°C to 110°C range with 10mV/°C output resolution. The device operates on a 4V to 30V supply and delivers ±1°C accuracy at 25°C test conditions. The LM35CZ is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility in analog temperature sensing applications while meeting modern compliance standards.

Substiute Parts

LM35CZ

Texas InstrumentsIn Stock: 2086LM35CZ Datasheet

Current PartRFQ

LM35CZ/NOPB

National SemiconductorIn Stock: 5027LM35CZ/NOPB Datasheet

DirectRFQ

TMP35GT9Z

Analog Devices Inc.In Stock: 1992TMP35GT9Z Datasheet

MFR RecommendedRFQ

TMP36GT9Z

Analog Devices Inc.In Stock: 22881TMP36GT9Z Datasheet

MFR RecommendedRFQ

TMP37FT9Z

Analog Devices Inc.In Stock: 1289TMP37FT9Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM35CZ are selected based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Sensor Type: Analog, Local temperature measurement
• Output Type: Analog Voltage
• Package / Case: TO-92-3 (TO-226AA) through-hole configuration
• Mounting Type: Through Hole
• Resolution: 10mV/°C output (with exception noted for TMP37FT9Z)

Secondary Compatibility Considerations:

• Sensing Temperature Range: Must cover or overlap the -40°C to 110°C operating window
• Voltage Supply Range: Must be compatible with application power supply
• Accuracy specifications: Must meet or exceed ±1°C requirement where applicable

The substitute parts are grouped into two categories: direct equivalents (LM35CZ/NOPB) and manufacturer-recommended alternatives (TMP35GT9Z, TMP36GT9Z, TMP37FT9Z). Direct equivalents maintain identical electrical and mechanical specifications. Manufacturer-recommended alternatives provide enhanced features such as shutdown mode and improved RoHS compliance while maintaining core analog temperature sensing functionality.

Parameter Comparison

Engineering Selection Recommendations

LM35CZ/NOPB is the direct equivalent substitute for the LM35CZ. It maintains identical electrical specifications (10mV/°C resolution, ±1°C accuracy, 4V to 30V supply range) and mechanical packaging (TO-92-3). The primary advantage is active product status and ROHS3 compliance, making it suitable for new designs and production environments requiring modern regulatory adherence.

TMP36GT9Z is the manufacturer-recommended alternative when extended temperature range capability is required. It covers -40°C to 125°C sensing range with 10mV/°C resolution and maintains TO-92-3 packaging. The trade-off is reduced accuracy (±3°C at 25°C versus ±1°C) and lower supply voltage range (2.7V to 5.5V). This part is appropriate for applications where the lower supply voltage is acceptable and extended upper temperature range provides design margin.

TMP35GT9Z is suitable for applications operating within the 10°C to 125°C range where the reduced lower temperature limit is acceptable. It shares the same 10mV/°C resolution and TO-92-3 package as the LM35CZ but operates on 2.7V to 5.5V supply and delivers ±3°C accuracy.

TMP37FT9Z differs from the LM35CZ in output resolution (20mV/°C versus 10mV/°C), providing doubled sensitivity. This part is appropriate only for applications where the higher resolution output is beneficial and the 5°C to 100°C sensing range meets requirements. The 20mV/°C resolution requires circuit redesign compared to the LM35CZ baseline.

All substitute parts maintain through-hole TO-92-3 packaging and analog voltage output, ensuring mechanical and electrical interface compatibility with existing PCB designs. Selection depends on specific application requirements regarding temperature range, supply voltage, accuracy tolerance, and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can LM35CZ/NOPB be used as a direct replacement for LM35CZ?

A: Yes. LM35CZ/NOPB is a direct equivalent with identical electrical and mechanical specifications. The primary differences are active product status and ROHS3 compliance. Pin configuration, output characteristics, and temperature sensing range are identical.

Q: What is the main difference between LM35CZ and TMP36GT9Z?

A: The LM35CZ operates on 4V to 30V supply with ±1°C accuracy across -40°C to 110°C. The TMP36GT9Z operates on 2.7V to 5.5V supply with ±3°C accuracy across -40°C to 125°C. Both use 10mV/°C resolution and TO-92-3 packaging. TMP36GT9Z is suitable when lower supply voltage and extended upper temperature range are required, accepting reduced accuracy.

Q: Why does TMP37FT9Z have different resolution than the LM35CZ?

A: TMP37FT9Z provides 20mV/°C resolution compared to the LM35CZ's 10mV/°C. This doubled sensitivity requires circuit redesign for analog-to-digital conversion and signal conditioning. Use TMP37FT9Z only when the higher resolution output is specifically required for the application.

Q: Are all substitute parts available in TO-92-3 packaging?

A: Yes. All substitute parts listed (LM35CZ/NOPB, TMP35GT9Z, TMP36GT9Z, TMP37FT9Z) are available in TO-92-3 through-hole packaging, ensuring mechanical compatibility with existing PCB designs.

Q: What supply voltage should I use when substituting with TMP35GT9Z or TMP36GT9Z?

A: Both TMP35GT9Z and TMP36GT9Z operate on 2.7V to 5.5V supply range, which is narrower than the LM35CZ's 4V to 30V range. Verify that your application power supply falls within 2.7V to 5.5V before selecting these parts. If your design requires higher supply voltages, use LM35CZ/NOPB instead.

Q: Which substitute part should I select for new product designs?

A: For new designs requiring direct LM35CZ functionality with modern compliance, use LM35CZ/NOPB. For designs where extended temperature range or lower supply voltage is beneficial, evaluate TMP36GT9Z or TMP35GT9Z based on specific temperature and supply requirements. Avoid TMP37FT9Z unless the 20mV/°C resolution is specifically required.

Q: Are all substitute parts RoHS compliant?

A: LM35CZ is RoHS non-compliant. All substitute parts (LM35CZ/NOPB, TMP35GT9Z, TMP36GT9Z, TMP37FT9Z) are ROHS3 compliant, meeting modern environmental and regulatory requirements.