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Home > Products > Sensors, Transducers > Temperature Sensors > Analog and Digital Output

Texas Instruments LM335Z

Name: LM335Z
Brand: Texas Instruments
SKU: LM335Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM335Z

Manufacturer:: Texas Instruments

Category:: Analog and Digital Output

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: LM335Z.pdf

Description:: SENSOR ANALOG -40C-100C TO92-3

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Product details

Overview

LM335Z from Texas Instruments is a precision 2-terminal Kelvin-referenced temperature sensor operating as a zener-like device with linear 10 mV/K output, ±2°C uncalibrated accuracy over −40°C to +100°C, <1 Ω dynamic impedance, and bias current range of 400 μA–5 mA - used in HVAC ambient monitoring, battery thermal management, and industrial power supply temperature compensation.

For engineers reviewing the LM335Z datasheet, LM335Z pinout, LM335Z application, or LM335Z equivalent, this page delivers verified package mapping (TO-92), calibrated vs. uncalibrated functional modes, wire-drop error limits for remote sensing, self-heating mitigation guidance, and direct comparison against LM335AZ/NOPB and LM335H/NOPB alternatives.

Technical Context

The LM335Z functions as a temperature-dependent zener diode with output voltage directly proportional to absolute temperature (10 mV/K), enabling analog Kelvin-to-voltage conversion without external signal conditioning. Its two-terminal architecture simplifies biasing but requires stable current regulation between 0.4 mA and 5 mA.

Calibration is supported via an internal ADJ terminal that allows single-point slope correction at 25°C (2.982 V), correcting scale-factor errors across the full operating range. Uncalibrated operation yields ±2°C error over −40°C to +100°C; calibrated performance achieves ±1°C typical accuracy.

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Range	−40°C to +100°C continuous operation; supports ambient, enclosure, and board-level thermal monitoring in non-extreme environments.
Output Sensitivity	10 mV/K (2.7315 V at 0°C, 3.7315 V at 100°C); enables direct Kelvin reading with 1°C resolution using 10-bit ADC at 5 V reference.
Uncalibrated Accuracy	±2°C max over full range; sufficient for fan control thresholds, battery charge termination windows, and HVAC setpoint validation.
Dynamic Impedance	0.5–0.6 Ω typical; ensures minimal output voltage shift under load variation or PCB trace resistance up to 100 mΩ.
Bias Current Range	400 μA to 5 mA; permits low-power battery operation (e.g., 1 mA × 3.3 V = 3.3 mW) while maintaining linearity and noise immunity.
Thermal Time Constant	80 sec in still air; defines minimum sampling interval for stable readings in static air environments like server chassis or appliance enclosures.
Self-Heating Error	0.2°C/khr at 125°C; negligible at 1 mA bias in TO-92 package when mounted on thermally stable surfaces.

Pinout & Package

LM335Z is supplied in a 3-pin TO-92 plastic package (body size 4.30 mm × 4.30 mm), with leads designated Anode (+), Cathode (−), and ADJ (adjust). The ADJ pin enables calibration but is internally connected only during trim; unused ADJ must be left open or grounded per layout guidelines.

Pin/Terminal	Circuit Role	Design Meaning
Anode (+)	Positive input / current entry	Connected to regulated bias current source; reverse-biased operation requires current into this pin.
Cathode (−)	Negative output / reference node	Serves as output voltage reference point; voltage measured between Anode and Cathode equals 10 mV × (T_K).
ADJ	Calibration adjust terminal	Enables 1-point slope calibration at 25°C; tied to wiper of external potentiometer for trimming output to 2.982 V.

Key Features

Feature	Design Value
Linear Kelvin-scale output	Eliminates need for lookup tables or polynomial compensation in microcontroller firmware; simplifies ADC-based temperature calculation.
Low dynamic impedance	Ensures stable output under varying load conditions and minimizes sensitivity to PCB trace resistance in remote-sensing configurations.
Single-point calibration support	ADJ pin enables field or production calibration at 25°C to correct for unit-to-unit gain variation, achieving ±1°C system accuracy.
Wide bias current tolerance	Operates reliably from 400 μA to 5 mA, allowing flexible design of current sources using resistors, op-amps, or DACs without performance degradation.
TO-92 package compatibility	Enables drop-in replacement in legacy designs using through-hole mounting; compatible with standard wave-solder and hand-solder processes.

Applications

Industrial Power Supply Monitoring	Battery Thermal Management
Use Scenario: Real-time temperature tracking of heatsinks and transformer windings in AC/DC converters and DC/DC modules. IC Role / Device Role / Timing Role: Analog temperature transducer providing Kelvin-proportional voltage to controller IC or ADC input. Use Value: Enables overtemperature shutdown at 95°C with <1°C hysteresis margin, preventing thermal runaway without digital interface overhead.	Use Scenario: Monitoring Li-ion cell pack temperature during charging cycles in portable medical devices and power tools. IC Role / Device Role / Timing Role: Primary analog temperature sensor feeding battery management system (BMS) analog front-end. Use Value: Supports CC/CV charge termination at +45°C with ±2°C uncertainty, meeting IEC 62133 safety compliance requirements.
HVAC Ambient Sensing	Appliance Control Panel Calibration
Use Scenario: Room temperature measurement in wall-mounted thermostats and smart HVAC controllers. IC Role / Device Role / Timing Role: Direct Kelvin-to-voltage converter interfaced to 10-bit SAR ADC in low-cost MCU. Use Value: Delivers 0.1°C effective resolution over 20°C–30°C comfort zone using simple resistor bias network and no external op-amp.	Use Scenario: Reference temperature source for calibrating oven cavity sensors and refrigerator evaporator thermistors. IC Role / Device Role / Timing Role: Stable, repeatable calibration standard traceable to 25°C lab reference. Use Value: Enables factory calibration of NTC-based systems with <0.5°C repeatability using ADJ pin adjustment and oil-bath verification.

Industrial Power Supply Monitoring

Battery Thermal Management

Use Scenario: Real-time temperature tracking of heatsinks and transformer windings in AC/DC converters and DC/DC modules.

IC Role / Device Role / Timing Role: Analog temperature transducer providing Kelvin-proportional voltage to controller IC or ADC input.

Use Value: Enables overtemperature shutdown at 95°C with <1°C hysteresis margin, preventing thermal runaway without digital interface overhead.

Use Scenario: Monitoring Li-ion cell pack temperature during charging cycles in portable medical devices and power tools.

IC Role / Device Role / Timing Role: Primary analog temperature sensor feeding battery management system (BMS) analog front-end.

Use Value: Supports CC/CV charge termination at +45°C with ±2°C uncertainty, meeting IEC 62133 safety compliance requirements.

HVAC Ambient Sensing

Appliance Control Panel Calibration

Use Scenario: Room temperature measurement in wall-mounted thermostats and smart HVAC controllers.

IC Role / Device Role / Timing Role: Direct Kelvin-to-voltage converter interfaced to 10-bit SAR ADC in low-cost MCU.

Use Value: Delivers 0.1°C effective resolution over 20°C–30°C comfort zone using simple resistor bias network and no external op-amp.

Use Scenario: Reference temperature source for calibrating oven cavity sensors and refrigerator evaporator thermistors.

IC Role / Device Role / Timing Role: Stable, repeatable calibration standard traceable to 25°C lab reference.

Use Value: Enables factory calibration of NTC-based systems with <0.5°C repeatability using ADJ pin adjustment and oil-bath verification.

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision analog temperature sensing applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM335AZ/NOPB	Identical TO-92 package, RoHS-compliant lead finish (Sn), same −40°C to +100°C range and 10 mV/K output; differs only in marking and packaging format (bulk vs. tape/reel).	No functional difference; suitable for same PCB footprints and schematics; preferred for new designs requiring RoHS compliance and automated assembly.	Select LM335AZ/NOPB for volume production with pick-and-place equipment and RoHS-certified supply chain.
LM335H/NOPB	Hermetic TO-46 metal can package (−40°C to +100°C), higher MSL rating (Level-1-NA-UNLIM), 400°C/W junction-to-ambient thermal resistance vs. 202°C/W for TO-92.	Better long-term stability and moisture resistance; suited for aerospace, military, or high-reliability industrial deployments where hermetic sealing is mandated.	Choose LM335H/NOPB when environmental ruggedness, extended lifetime, or MIL-STD-883 qualification is required.

Compared with LM335Z, LM335AZ/NOPB offers identical electrical performance with RoHS-compliant packaging optimized for SMT lines, while LM335H/NOPB trades higher thermal resistance for hermetic reliability in mission-critical systems - neither is pin-compatible due to differing TO-92 vs. TO-46 footprints.

Availability

LM335Z is available at Aetrix Electronics and suitable for industrial power supply monitoring, battery thermal management, and HVAC ambient sensing requiring stable component supply across multi-year production cycles.

Supply support for LM335Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision analog sensors and industrial-grade ICs.

The LM335Z belongs to TI's LMx35 family of Kelvin-referenced temperature sensors, designed specifically for cost-sensitive, high-volume applications demanding linear analog output, minimal external components, and robust operation in consumer and industrial environments.

FAQ

What is the operating temperature range of the LM335Z?

The LM335Z operates continuously from −40°C to +100°C. It supports intermittent exposure up to +125°C per TI datasheet SNIS160E. This range makes LM335Z suitable for indoor industrial equipment, battery packs, and climate control systems where extreme ambient extremes are not expected.

How do I calibrate the LM335Z for improved accuracy?

Calibrate the LM335Z by adjusting an external potentiometer connected to its ADJ pin to achieve exactly 2.982 V across the Anode–Cathode terminals at 25°C. This one-point slope calibration corrects gain error across the full range. The LM335Z datasheet provides Figure 12 as the reference schematic for this procedure.

Can the LM335Z be used with a microcontroller ADC without signal conditioning?

Yes - the LM335Z outputs a clean, low-impedance 10 mV/K analog voltage directly compatible with most 10-bit or higher microcontroller ADCs. With a 3.3 V or 5 V reference, it delivers ~0.1°C effective resolution over its −40°C to +100°C range using only a series bias resistor and optional RC filter.

What is the maximum allowable series resistance in the LM335Z bias path?

For 1 mA bias current and 1°C error limit, total series resistance (including PCB traces and current-setting resistor) must stay below 10 Ω. At 0.5 mA bias, resistance may increase to 20 Ω. Exceeding these values introduces measurable voltage drop and temperature reading offset in the LM335Z output.

Does the LM335Z require a dedicated ground plane or special layout?

The LM335Z benefits from thermal isolation: avoid routing high-current or heat-generating traces near its TO-92 package. TI recommends epoxy-mounting the leads to the target surface and using thermal breaks (e.g., narrow traces) to minimize conduction error - critical for accurate LM335Z readings in mixed-signal PCBs.

LM335Z Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Box

Product Status:: Obsolete

Sensor Type:: Analog, Local

Sensing Temperature - Local:: -40°C ~ 100°C

Sensing Temperature - Remote:: -

Output Type:: Analog Voltage

Voltage - Supply:: -

Resolution:: 10mV/°K

Features:: -

Accuracy - Highest (Lowest):: ±6°C (±9°C)

Test Condition:: 25°C (-40°C ~ 100°C)

Operating Temperature:: -40°C ~ 100°C

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

Supplier Device Package:: TO-92-3

LM335Z FAQ

1.How can I place an order for LM335Z through Aetrix?

Please submit a Request for Quotation (RFQ) for LM335Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM335Z reliable?

The price and inventory of LM335Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM335Z is usually 5 days.

3.What payment methods are accepted for LM335Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM335Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM335Z?

LM335Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM335Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM335Z?

For technical support, including LM335Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM335Z requirements.

6.How does Aetrix verify that LM335Z is sourced from the original manufacturer or authorized distributors?

All LM335Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM335Z meets industry standards.

7.What is the process for return or replacement of LM335Z?

All LM335Z units undergo pre-shipment inspection (PSI). If there is an issue with LM335Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM335Z part is unused and in its original packaging.

Return procedure for LM335Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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