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Texas Instruments LM235H
- Part No.:
- LM235H
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM235H.pdf
- Description:
- SENSOR ANALOG -40C-125C TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,231
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Product details
Overview
LM235H from Texas Instruments is a precision 2-terminal Kelvin-referenced temperature sensor operating as a zener-mode IC with linear 10 mV/K output, ±1°C initial accuracy at 25°C, −40°C to +125°C operating range, and <1 Ω dynamic impedance. It delivers stable voltage proportional to absolute temperature for analog temperature monitoring in industrial power supplies and battery management systems.
For engineers reviewing the LM235H datasheet, LM235H pinout, LM235H application, or LM235H equivalent, this page provides verified specifications, TO-46 package details, calibrated vs. uncalibrated functional modes, thermal time constants in still air (80 s) and stirred oil (1 s), and real-world substitution guidance for embedded temperature sensing designs.
Technical Context
The LM235H functions as a 2-terminal temperature-dependent zener diode with output voltage directly proportional to absolute temperature (10 mV/K), enabling direct Kelvin-scale readout without signal conditioning. Its low 0.6 Ω typical dynamic impedance ensures minimal current-sensitivity error across its 0.4–5 mA operating range.
It supports both uncalibrated operation (±2.7°C max error over full range) and single-point calibration via the ADJ pin to achieve ±1°C accuracy across −40°C to +125°C. Thermal response varies significantly by environment: 1 s in stirred oil, 10 s in 100 ft/min airflow, and 80 s in still air-critical for system-level timing and settling behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Slope | 10 mV/K - Enables direct Kelvin-to-voltage conversion; 298.2 mV at 25°C (298.15 K) |
| Initial Accuracy | ±1°C at 25°C - Achievable without calibration; reduces system test overhead |
| Operating Range | −40°C to +125°C - Validated for automotive under-hood and industrial control environments |
| Dynamic Impedance | 0.6 Ω typical - Minimizes output voltage shift with supply or load current variation |
| Supply Current Range | 0.4 mA to 5 mA - Allows low-power battery operation while maintaining linearity and stability |
| Thermal Time Constant | 80 s in still air - Determines minimum sampling interval for ambient air temperature tracking |
| Non-Linearity Error | ±0.5°C - Limits deviation from ideal 10 mV/K slope across full temperature range |
Pinout & Package
LM235H is housed in a hermetic TO-46 metal can package (4.699 mm × 4.699 mm), rated for −40°C to +125°C operation, with glass-sealed leads and internal thermal path optimized for surface-mount or through-hole mounting with epoxy bonding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| + | Positive terminal / Anode | Connected to bias current source; reverse-biased zener node where output voltage develops |
| − | Negative terminal / Cathode | Reference node tied to system ground or measurement circuit common; defines Kelvin-scale zero offset |
| ADJ | Calibration adjust terminal | Enables single-point slope calibration; connected to external potentiometer to trim output at 25°C |
Key Features
| Feature | Design Value |
|---|---|
| Direct Kelvin calibration | 10 mV/K output eliminates need for digital compensation or lookup tables in analog front ends |
| Easily calibrated architecture | Single 25°C trim via ADJ pin corrects full-range scale factor error without multi-point characterization |
| Low dynamic impedance | 0.6 Ω ensures <2.5 mV output shift over 4.6 mA current range-critical for stable ADC reference |
| Wide operating current range | 0.4–5 mA enables use in ultra-low-power (e.g., 10 μA standby + wake-on-temp) and high-accuracy (1 mA nominal) modes |
| Hermetic TO-46 packaging | Provides long-term stability in humid, corrosive, or high-reliability industrial environments |
Applications
| Industrial Power Supply Monitoring | Battery Pack Thermal Management |
|---|---|
Use Scenario: Real-time die temperature tracking inside switch-mode power supply controllers to prevent thermal runaway during overload conditions. IC Role / Device Role / Timing Role: Analog temperature transducer providing continuous Kelvin-proportional voltage to feedback loop comparator or microcontroller ADC. Use Value: Enables immediate shutdown at 125°C with ±1°C margin, avoiding derating penalties and extending MOSFET lifetime. |
Use Scenario: Cell-level temperature sensing in 12S Li-ion battery packs for charge termination and thermal cutoff logic. IC Role / Device Role / Timing Role: Primary analog temperature sensor interfaced to battery monitor IC's analog input channel. Use Value: 80 s thermal time constant in still air matches cell thermal mass, ensuring accurate average temperature capture during slow charge cycles. |
| HVAC Ambient Air Sensing | Appliance Motor Winding Protection |
Use Scenario: Wall-mounted thermostat measuring room air temperature using natural convection cooling. IC Role / Device Role / Timing Role: Ambient temperature reference element mounted on PCB with thermal isolation traces. Use Value: 10 mV/K linearity allows direct scaling to 0.1°C resolution in 12-bit ADC without polynomial correction. |
Use Scenario: Embedded in washing machine motor housing to detect winding overheating during high-torque spin cycles. IC Role / Device Role / Timing Role: High-stability thermal sentinel placed in direct thermal contact with stator laminations. Use Value: Hermetic TO-46 package withstands vibration and humidity, maintaining ±1°C accuracy over 10,000-cycle lifetime. |
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 |
|---|---|---|---|
| LM235AH/NOPB | Improved initial accuracy (±0.5°C at 25°C) and tighter full-range error (±1.3°C vs. ±2.7°C uncalibrated); RoHS-compliant lead finish | Preferred for medical devices and test equipment requiring higher factory calibration grade | Select LM235AH/NOPB when ±0.5°C initial spec and Pb-free compliance are mandatory; same TO-46 footprint and pinout |
| LM335AZ/NOPB | TO-92 plastic package, −40°C to +100°C range, ±2°C uncalibrated accuracy, lower cost; no ADJ pin | Suitable for consumer appliances and cost-sensitive HVAC controls where extended temperature range is not required | Choose LM335AZ/NOPB only for non-critical ≤100°C applications; lacks calibration capability and hermetic reliability of LM235H |
Compared with LM235AH/NOPB, LM235H offers lower acquisition cost and legacy compatibility but trades ±0.5°C initial accuracy; versus LM335AZ/NOPB, it delivers superior thermal range, calibration support, and hermetic stability-justifying use in industrial and automotive contexts where long-term drift and environmental resilience matter.
Availability
LM235H is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and HVAC controls requiring stable component supply with proven long-term calibration retention and hermetic package integrity.
Supply support for LM235H 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, embedded processing, and high-reliability components, with decades of heritage in precision analog sensor design.
The LM235H belongs to TI's LMx35 precision temperature sensor family, engineered for direct Kelvin-scale analog output in industrial, automotive, and instrumentation applications demanding low-drift, calibration-flexible thermal monitoring.
FAQ
What is the operating temperature range of the LM235H?
The LM235H operates from −40°C to +125°C. This range is validated per TI's SNIS160E datasheet and applies specifically to the LM235H variant-not the wider −55°C to +150°C range of the LM135 series. The upper limit of +125°C makes LM235H suitable for under-hood automotive and industrial motor control applications where ambient heat exceeds consumer-grade limits.
Does the LM235H require external calibration to achieve ±1°C accuracy?
Yes-the LM235H achieves ±1°C accuracy over its full −40°C to +125°C range only after single-point calibration at 25°C using the ADJ pin and an external potentiometer. Uncalibrated, its typical full-range error is ±2.7°C. The LM235H datasheet specifies that calibration corrects slope (scale factor) error, which dominates output deviation across temperature.
What package type does the LM235H use, and is it RoHS-compliant?
The LM235H uses a hermetic TO-46 metal can package (3-pin, 4.699 mm × 4.699 mm). Per TI's Packaging Information addendum, LM235H is non-RoHS (lead-containing); for RoHS compliance, specify LM235H/NOPB or LM235AH/NOPB. The TO-46 package provides superior moisture resistance and long-term stability versus plastic alternatives like TO-92.
How does the LM235H differ from the LM335 in terms of functionality and pinout?
The LM235H is a 3-pin device (positive, negative, ADJ) supporting calibration; the LM335 is a 2-pin device (no ADJ) with fixed 10 mV/K output and no user-adjustable slope. LM235H's TO-46 package differs mechanically from LM335's TO-92 or SOIC variants, and its −40°C to +125°C range exceeds LM335's −40°C to +100°C limit. Both share the same 10 mV/K slope but differ in calibration capability and thermal robustness.
What is the recommended operating current for the LM235H, and why does it matter?
Texas Instruments specifies a recommended operating current of 0.4 mA to 5 mA for the LM235H. At 1 mA nominal, dynamic impedance is minimized (0.6 Ω), reducing output voltage variation with current changes. Operating below 0.4 mA risks increased noise and non-linearity; above 5 mA may cause self-heating errors exceeding ±0.2°C/khr. Stable current sourcing is essential for repeatable accuracy.
LM235H 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 ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- -
- Resolution:
- 10mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±3°C (±5°C)
- Test Condition:
- 25°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-46-3
LM235H FAQ
1.How can I place an order for LM235H through Aetrix?
Please submit a Request for Quotation (RFQ) for LM235H 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 LM235H reliable?
The price and inventory of LM235H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM235H is usually 5 days.
3.What payment methods are accepted for LM235H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM235H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM235H?
LM235H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM235H 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 LM235H?
For technical support, including LM235H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM235H requirements.
6.How does Aetrix verify that LM235H is sourced from the original manufacturer or authorized distributors?
All LM235H 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 LM235H meets industry standards.
7.What is the process for return or replacement of LM235H?
All LM235H units undergo pre-shipment inspection (PSI). If there is an issue with LM235H, 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 LM235H part is unused and in its original packaging.
Return procedure for LM235H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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