LM335Z Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM335Z is an analog temperature sensor manufactured by Texas Instruments, designed for local temperature measurement across the -40°C to 100°C range with 10mV/°K output resolution. The device is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The LM335Z operates as a precision analog voltage output sensor in a TO-92-3 through-hole package, suitable for applications requiring direct temperature-to-voltage conversion without digital interface requirements.

Substiute Parts

LM335Z

Texas InstrumentsIn Stock: 56797LM335Z Datasheet

Current PartRFQ

LM335Z/NOPB

National SemiconductorIn Stock: 59164LM335Z/NOPB Datasheet

DirectRFQ

LM235Z

STMicroelectronicsIn Stock: 29606LM235Z Datasheet

MFR RecommendedRFQ

LM335AZ

STMicroelectronicsIn Stock: 1133LM335AZ Datasheet

MFR RecommendedRFQ

LM335Z

STMicroelectronicsIn Stock: 56722LM335Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM335Z is determined by the following critical parameters: sensor type (analog, local), temperature sensing range, output type (analog voltage), resolution (10mV/°K), mounting type (through hole), and package configuration (TO-92-3). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs.

The substitute parts are grouped into two categories:

Direct Equivalent: Parts that maintain identical electrical specifications and package configuration, differing only in manufacturer or product status.

Functional Equivalent: Parts that extend the temperature sensing range or improve accuracy while maintaining the same output resolution, package type, and mounting method.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The LM335Z/NOPB from National Semiconductor and the LM335Z from STMicroelectronics serve as direct replacements for the obsolete Texas Instruments LM335Z. Both maintain the -40°C to 100°C temperature range, 10mV/°K resolution, and TO-92-3 package configuration. The STMicroelectronics LM335Z offers improved accuracy (±1°C versus ±6°C) while maintaining identical electrical and mechanical specifications. The LM335Z/NOPB is classified as active product status, ensuring continued availability.

For Enhanced Performance:

The LM335AZ from STMicroelectronics provides improved accuracy (±3°C) over the original LM335Z while maintaining the same temperature range and package type. This part is suitable for applications requiring tighter accuracy specifications without extending the temperature measurement range.

The LM235Z from STMicroelectronics extends the upper temperature limit to 125°C while maintaining 10mV/°K resolution and TO-92-3 packaging. This part is appropriate for applications requiring measurement capability beyond 100°C. The LM235Z achieves ±1.5°C accuracy and carries ROHS3 compliance.

For Regulatory Compliance:

All STMicroelectronics substitute parts (LM335AZ, LM335Z, LM235Z) carry ROHS3 compliance certification, addressing environmental and regulatory requirements. The original Texas Instruments LM335Z is RoHS non-compliant. Selection of compliant alternatives is necessary for applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can the LM335Z/NOPB be used as a direct replacement for the obsolete Texas Instruments LM335Z?

A: Yes. The LM335Z/NOPB maintains identical electrical specifications (temperature range -40°C to 100°C, 10mV/°K resolution, analog voltage output) and package configuration (TO-92-3 through-hole). The primary difference is manufacturer (National Semiconductor) and active product status. Circuit-level compatibility is maintained.

Q: What is the difference between the LM335Z and LM235Z?

A: The LM235Z extends the upper temperature sensing limit to 125°C compared to the LM335Z at 100°C. Both maintain 10mV/°K resolution and TO-92-3 packaging. The LM235Z is appropriate for applications requiring measurement capability in the 100°C to 125°C range. All other electrical and mechanical parameters remain compatible.

Q: Does the STMicroelectronics LM335Z offer advantages over the original Texas Instruments part?

A: The STMicroelectronics LM335Z improves accuracy to ±1°C (compared to ±6°C for the original) while maintaining identical temperature range (-40°C to 100°C), resolution (10mV/°K), and package type (TO-92-3). It also carries ROHS3 compliance. These improvements make it suitable for applications requiring higher accuracy without circuit redesign.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All substitute parts listed (LM335Z/NOPB, LM335AZ, LM335Z from STM, and LM235Z) are supplied in TO-92-3 through-hole packages, ensuring mechanical and mounting compatibility with the original LM335Z.

Q: Which substitute part should be selected for new designs?

A: For new designs, the STMicroelectronics LM335Z is recommended due to active product status, improved accuracy (±1°C), and ROHS3 compliance. For applications requiring extended temperature measurement to 125°C, the LM235Z is appropriate. Both parts maintain the same package and resolution as the original LM335Z.

Q: What is the impact of switching from the original LM335Z to a substitute part on circuit design?

A: No circuit redesign is required. All substitute parts maintain identical output type (analog voltage), resolution (10mV/°K), and package configuration (TO-92-3). Pin-to-pin compatibility is preserved. Improved accuracy specifications in substitute parts do not require circuit modifications.