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

Texas Instruments LM335H

Name: LM335H
Brand: Texas Instruments
SKU: LM335H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM335H

Manufacturer:: Texas Instruments

Category:: Analog and Digital Output

Package:: TO-206AB, TO-46-3 Metal Can

Datasheet:: LM335H.pdf

Description:: SENSOR ANALOG -40C-100C TO46-3

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Product details

Overview

LM335H from Texas Instruments is a precision 2-terminal zener-based temperature sensor with linear Kelvin-scaled output (10 mV/°K), ±2°C uncalibrated accuracy over −40°C to +100°C, <1 Ω dynamic impedance, and operating current range of 400 μA to 5 mA - used in battery management, HVAC control, and industrial temperature monitoring circuits.

For engineers reviewing the LM335H datasheet, LM335H pinout, LM335H application, or LM335H equivalent, this page delivers verified technical context, package mapping, calibrated error behavior, thermal time constants, and real-world interface constraints including self-heating and wire-drop error limits.

Technical Context

The LM335H operates as a temperature-dependent zener diode with output voltage directly proportional to absolute temperature (10 mV/°K), requiring external bias current and offering calibration via the ADJ pin for slope correction. Its low dynamic impedance (<1 Ω) ensures stable voltage output across 0.4–5 mA bias current.

It functions in two modes: uncalibrated (±2°C typical error over full range) and calibrated (±1°C after single-point 25°C adjustment). Thermal response varies by mounting: 1 sec in stirred oil, 10 sec at 100 ft/min airflow, and 80 sec in still air - critical for closed-loop thermal control timing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Scale	10 mV/°K - enables direct Kelvin-to-voltage conversion without signal conditioning
Temperature Range	−40°C to +100°C - defines usable ambient envelope for industrial and consumer systems
Uncalibrated Accuracy	±2°C max over full range - sets baseline precision before ADJ pin calibration
Bias Current Range	400 μA to 5 mA - determines minimum power draw and maximum self-heating error
Dynamic Impedance	0.5 Ω typical - ensures minimal output voltage shift under load or current variation
Thermal Time Constant	1 sec (stirred oil), 10 sec (100 ft/min air), 80 sec (still air) - governs system response latency
Self-Heating Drift	0.2°C/khr at 125°C - quantifies long-term stability degradation under sustained bias

Pinout & Package

LM335H uses a hermetic TO-46 (NDV) metal can package with 3 leads: anode (positive input), cathode (negative output), and ADJ (calibration adjust). The package provides robust thermal coupling and ESD protection suitable for harsh environments.

Pin/Terminal	Circuit Role	Design Meaning
Anode (+)	Positive input terminal	Receives bias current; voltage develops across device proportional to absolute temperature
Cathode (−)	Negative output terminal	Reference node for output voltage measurement; connected to system ground or return path
ADJ	Calibration adjust pin	Enables single-point slope calibration at 25°C to correct scale factor errors across full range

Key Features

Feature	Design Value
Linear Kelvin output	10 mV/°K scaling eliminates need for lookup tables or nonlinear compensation circuitry
Low dynamic impedance	0.5 Ω typical ensures stable output under varying load conditions and supply ripple
Single-point calibration	ADJ pin allows 1-point slope trim at 25°C to achieve ±1°C accuracy over full −40°C to +100°C range
Wide bias current range	Supports 0.4–5 mA operation - enables ultra-low-power designs (<170 μW at 400 μA) or high-stability configurations
Hermetic TO-46 package	Provides moisture resistance, thermal stability, and long-term reliability in industrial environments

Applications

Industrial Temperature Monitoring	Battery Thermal Management
Use Scenario: Real-time die temperature tracking inside sealed industrial enclosures with ambient swings from −25°C to +85°C. IC Role / Device Role / Timing Role: Primary temperature reference feeding analog-to-digital converter inputs in PLC I/O modules. Use Value: Linear 10 mV/°K output simplifies ADC scaling; TO-46 hermeticity prevents drift from humidity ingress during 10+ year deployments.	Use Scenario: Cell-level thermal cutoff in lithium-ion battery packs during fast charging cycles. IC Role / Device Role / Timing Role: Analog sensor providing feedback to charge controller ICs for thermal foldback and termination. Use Value: 80 sec still-air time constant matches battery thermal mass, enabling accurate slow-ramp detection without overshoot.
HVAC Zone Sensing	Appliance Overtemperature Protection
Use Scenario: Wall-mounted thermostat sensing room air temperature with ±0.5°C resolution requirement. IC Role / Device Role / Timing Role: Direct Kelvin-to-voltage transducer interfaced to low-cost microcontroller ADC with no op-amp buffering. Use Value: Low 0.5 Ω impedance allows direct connection to 10-bit ADC inputs; self-heating <0.1°C at 1 mA bias ensures reading fidelity.	Use Scenario: Overtemperature cutoff in microwave oven cavity or induction cooktop power stage. IC Role / Device Role / Timing Role: Safety-critical thermal sentinel triggering hardware shutdown when core temperature exceeds 95°C. Use Value: Hermetic TO-46 package withstands repeated thermal cycling and condensation; 100°C max rating aligns with UL Class B insulation limits.

Industrial Temperature Monitoring

Battery Thermal Management

Use Scenario: Real-time die temperature tracking inside sealed industrial enclosures with ambient swings from −25°C to +85°C.

IC Role / Device Role / Timing Role: Primary temperature reference feeding analog-to-digital converter inputs in PLC I/O modules.

Use Value: Linear 10 mV/°K output simplifies ADC scaling; TO-46 hermeticity prevents drift from humidity ingress during 10+ year deployments.

Use Scenario: Cell-level thermal cutoff in lithium-ion battery packs during fast charging cycles.

IC Role / Device Role / Timing Role: Analog sensor providing feedback to charge controller ICs for thermal foldback and termination.

Use Value: 80 sec still-air time constant matches battery thermal mass, enabling accurate slow-ramp detection without overshoot.

HVAC Zone Sensing

Appliance Overtemperature Protection

Use Scenario: Wall-mounted thermostat sensing room air temperature with ±0.5°C resolution requirement.

IC Role / Device Role / Timing Role: Direct Kelvin-to-voltage transducer interfaced to low-cost microcontroller ADC with no op-amp buffering.

Use Value: Low 0.5 Ω impedance allows direct connection to 10-bit ADC inputs; self-heating <0.1°C at 1 mA bias ensures reading fidelity.

Use Scenario: Overtemperature cutoff in microwave oven cavity or induction cooktop power stage.

IC Role / Device Role / Timing Role: Safety-critical thermal sentinel triggering hardware shutdown when core temperature exceeds 95°C.

Use Value: Hermetic TO-46 package withstands repeated thermal cycling and condensation; 100°C max rating aligns with UL Class B insulation limits.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM335AH/NOPB	Improved initial accuracy (±1°C vs. ±2°C uncalibrated); same TO-46 package and pinout	Suitable where factory-calibrated performance reduces need for field trim	Select LM335AH/NOPB when tighter baseline accuracy justifies higher cost and RoHS compliance is required
LM335AZ/NOPB	Plastic TO-92 package (LP), lower cost, wider availability; ±3°C uncalibrated accuracy	Preferred for cost-sensitive consumer appliances with less stringent thermal stability requirements	Choose LM335AZ/NOPB for non-industrial use cases where hermeticity and long-term drift are not critical

Compared with LM335AH/NOPB, LM335H offers lower baseline accuracy but identical thermal response and calibration capability; versus LM335AZ/NOPB, it trades plastic-package cost savings for hermetic reliability and tighter thermal time constant control in demanding environments.

Availability

LM335H is available at Aetrix Electronics and suitable for industrial temperature monitoring, battery thermal management, and HVAC zone sensing requiring stable component supply across extended product lifecycles.

Supply support for LM335H 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 experience in precision analog sensors and industrial-grade components.

The LM335H belongs to TI's LMx35 family of Kelvin-referenced temperature sensors, designed specifically for applications demanding linear, low-impedance, and calibration-capable analog temperature measurement in harsh or long-lifecycle environments.

FAQ

What is the operating temperature range of the LM335H?

The LM335H operates from −40°C to +100°C. This range is explicitly specified in the datasheet's Recommended Operating Conditions table and applies to the LM335H variant in TO-46 packaging. Operation beyond 100°C risks permanent accuracy degradation, and intermittent exposure above 125°C is not supported.

How does the ADJ pin on the LM335H enable calibration?

The ADJ pin on the LM335H allows single-point slope calibration at 25°C using an external potentiometer. Because the LM335H's output is linearly proportional to absolute temperature (10 mV/°K), adjusting the slope at one point corrects scale factor errors across the entire −40°C to +100°C range, reducing uncalibrated ±2°C error to ±1°C.

What is the maximum allowable bias current for the LM335H?

The LM335H supports a continuous bias current range of 400 μA to 5 mA. Exceeding 5 mA violates Absolute Maximum Ratings and may cause irreversible damage. At 5 mA, self-heating increases output error by ~0.5°C - design guidance recommends 1 mA for optimal balance of signal-to-noise ratio and thermal stability.

Can the LM335H be used in a grounded-circuit configuration?

Yes, the LM335H can be used in grounded-circuit configurations, such as centigrade thermometers or cold-junction compensation circuits. Its 2-terminal architecture allows either terminal to serve as system ground reference, provided the ADJ pin is properly terminated and bias current remains within 400 μA–5 mA.

What thermal time constant should be expected when using the LM335H in still air?

In still air, the LM335H exhibits a thermal time constant of 80 seconds - defined as the time required to reach 63.2% of a step-change temperature. This value is measured per datasheet Figure 9 and reflects the thermal mass and surface-area-to-volume ratio of the TO-46 metal can package.

LM335H Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: TO-206AB, TO-46-3 Metal Can

Packaging:: Bulk

Product Status:: Active

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-46-3

LM335H FAQ

1.How can I place an order for LM335H through Aetrix?

Please submit a Request for Quotation (RFQ) for LM335H 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 LM335H reliable?

The price and inventory of LM335H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM335H is usually 5 days.

3.What payment methods are accepted for LM335H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM335H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM335H?

LM335H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM335H 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 LM335H?

For technical support, including LM335H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM335H requirements.

6.How does Aetrix verify that LM335H is sourced from the original manufacturer or authorized distributors?

All LM335H 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 LM335H meets industry standards.

7.What is the process for return or replacement of LM335H?

All LM335H units undergo pre-shipment inspection (PSI). If there is an issue with LM335H, 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 LM335H part is unused and in its original packaging.

Return procedure for LM335H:

1.Submit a request within 90 days.

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

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