LM335M Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM335M is an analog local temperature sensor manufactured by Texas Instruments, designed for temperature measurement applications across the -40°C to 100°C range with 10mV/°K resolution. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. This obsolescence necessitates identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility while meeting current design standards and compliance requirements.

Substiute Parts

LM335M

Texas InstrumentsIn Stock: 4008LM335M Datasheet

Current PartRFQ

LM335M/NOPB

Texas InstrumentsIn Stock: 1997LM335M/NOPB Datasheet

DirectRFQ

LM235DT

STMicroelectronicsIn Stock: 19905LM235DT Datasheet

MFR RecommendedRFQ

LM335ADT

STMicroelectronicsIn Stock: 15376LM335ADT Datasheet

MFR RecommendedRFQ

LM335DT

STMicroelectronicsIn Stock: 37979LM335DT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM335M is determined by the following critical parameters:

• Sensor Type & Output: Must be Analog, Local with Analog Voltage output
• Resolution: Must maintain 10mV/°K resolution
• Package Compatibility: Must use 8-SOIC (0.154", 3.90mm Width) surface mount package
• Temperature Range: Operating range must encompass or exceed -40°C ~ 100°C
• Accuracy: Acceptable substitutes may have equal or superior accuracy specifications

Substitute parts are grouped into two categories:

1. Direct Equivalent (Same Manufacturer): LM335M/NOPB maintains identical electrical specifications and package format, differing only in RoHS compliance status and product lifecycle designation.

2. Cross-Manufacturer Alternatives (STMicroelectronics): LM235DT, LM335ADT, and LM335DT provide equivalent or superior performance with improved accuracy and active product status, suitable for new designs.

Parameter Comparison

Engineering Selection Recommendations

For Legacy System Maintenance: LM335M/NOPB provides direct electrical equivalence with improved RoHS3 compliance and REACH unaffected status, suitable for sustaining existing designs with minimal circuit modification.

For New Designs and Active Product Requirements: STMicroelectronics alternatives (LM235DT, LM335ADT, LM335DT) are recommended due to active product status and full compliance certifications. Selection among these three depends on application-specific accuracy and temperature range requirements:

• LM235DT: Extended temperature range to 125°C with ±3°C accuracy; suitable for applications requiring broader thermal coverage
• LM335ADT: Matched temperature range (-40°C ~ 100°C) with improved ±3°C accuracy; direct performance upgrade
• LM335DT: Superior ±1°C accuracy specification; optimal for precision temperature measurement applications within the -40°C ~ 100°C range

All substitute parts maintain identical 8-SOIC package geometry and 10mV/°K resolution, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LM335M be directly replaced with LM335M/NOPB on existing PCBs?

A: Yes. Both parts share identical electrical specifications, resolution (10mV/°K), accuracy (±6°C / ±9°C), and 8-SOIC package dimensions. The primary difference is RoHS3 compliance status and product lifecycle designation. No circuit modifications are required.

Q: What is the key difference between LM235DT and LM335ADT?

A: Both are STMicroelectronics products with improved ±3°C accuracy. LM235DT extends the sensing temperature range to -40°C ~ 125°C, while LM335ADT maintains the original -40°C ~ 100°C range. Selection depends on whether the application requires operation above 100°C.

Q: Why does LM335DT show ±1°C accuracy instead of ±3°C?

A: LM335DT represents an enhanced accuracy grade within the LM335 product family. The ±1°C specification indicates superior performance for precision measurement applications, while maintaining the same 10mV/°K resolution and 8-SOIC package format.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LM335M/NOPB, LM235DT, LM335ADT, and LM335DT are all ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements. The original LM335M is RoHS non-compliant and REACH Affected.

Q: Can these temperature sensors be used interchangeably in the same circuit?

A: Yes, provided the application's temperature range and accuracy requirements are met. All substitute parts use identical 8-SOIC packaging and 10mV/°K resolution. Verify that the selected part's operating temperature range encompasses your application's thermal environment.

Q: What packaging formats are available for these substitutes?

A: LM335M/NOPB is supplied in Tube packaging. LM235DT, LM335ADT, and LM335DT are available in Cut Tape (CT) & Digi-Reel® packaging formats, supporting both manual and automated assembly processes.