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Texas Instruments LM235AH
- Part No.:
- LM235AH
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM235AH.pdf
- Description:
- SENSOR ANALOG -40C-125C TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,132
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Product details
Overview
LM235AH 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 calibrated temperature sensing in power supply monitoring, battery thermal management, and HVAC control circuits where low-impedance analog interfacing is required.
For engineers reviewing the LM235AH datasheet, LM235AH pinout, LM235AH application, or LM235AH equivalent, this page provides verified specifications, TO-46 package details, functional pin definitions, real-world use cases, and two validated alternative parts for thermal sensing designs requiring stable 2-terminal analog output and direct Kelvin scaling.
Technical Context
The LM235AH functions as a 2-terminal temperature-dependent zener diode with output voltage directly proportional to absolute temperature (10 mV/K), enabling direct Kelvin readout without signal conditioning. Its internal architecture eliminates need for external amplification or linearization circuitry.
It operates over 400 μA–5 mA bias current with negligible performance shift, supports one-point calibration via ADJ pin to correct slope error, and maintains ≤1°C uncalibrated error across its full −40°C to +125°C range when calibrated at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | −40°C to +125°C continuous operation; supports industrial ambient and under-hood automotive thermal monitoring |
| Output Sensitivity | 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 - allows system-level calibration without trimming for many embedded applications |
| Dynamic Impedance | <1 Ω - ensures minimal voltage droop under varying load or trace resistance; stabilizes reading in noisy environments |
| Bias Current Range | 400 μA to 5 mA - accommodates low-power battery systems and high-stability wired sensors without performance loss |
| Non-Linearity Error | ±0.5°C max - guarantees monotonic response across full range; critical for closed-loop thermal control |
| Thermal Time Constant | 1 sec in stirred oil - enables rapid response in liquid-cooled systems and fast transient detection |
Pinout & Package
LM235AH is housed in a hermetic TO-46 metal can package (body size 4.699 mm × 4.699 mm) with 3 leads: anode (positive terminal), cathode (negative terminal), and ADJ (calibration adjust). The package provides robust thermal coupling and long-term stability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (+) | Positive input / bias terminal | Receives forward bias current; voltage measured between Anode and Cathode reflects absolute temperature |
| Cathode (−) | Negative output / reference terminal | Serves as output return path; voltage at Anode relative to Cathode equals 10 mV × (TK) |
| ADJ | Calibration adjustment terminal | Enables single-point slope calibration; connected to potentiometer wiper to trim output at known temperature |
Key Features
| Feature | Design Value |
|---|---|
| Direct Kelvin calibration | Eliminates need for offset/gain stages; simplifies analog front-end design in microcontroller-based thermometers |
| Low dynamic impedance | Ensures stable output under varying PCB trace resistance or cable length up to 4000 ft (AWG14, 1 mA) |
| Wide bias current range | Supports ultra-low-power sleep modes (400 μA) and high-accuracy active sensing (5 mA) in same design |
| Hermetic TO-46 packaging | Provides moisture resistance and long-term drift stability in industrial and automotive under-hood applications |
| One-point calibration capability | Corrects scale factor error across full range using ADJ pin; avoids multi-point calibration complexity |
Applications
| Power Supply Thermal Monitoring | Battery Pack Temperature Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking in switching regulators and LDOs to prevent thermal shutdown and optimize efficiency. IC Role / Device Role / Timing Role: Analog temperature transducer providing Kelvin-scaled voltage to ADC or comparator input. Use Value: Enables predictive thermal throttling before junction exceeds safe limit; reduces need for discrete thermistors and lookup tables. |
Use Scenario: Cell-level temperature measurement in Li-ion battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Primary temperature sensor feeding battery management system (BMS) safety logic. Use Value: Delivers linear, calibrated output with <1 Ω impedance-minimizing voltage drop errors over flexible PCB traces or interconnect cables. |
| HVAC Ambient Sensing | Industrial Motor Winding Protection |
Use Scenario: Room/duct air temperature feedback in commercial HVAC controllers requiring long-term stability. IC Role / Device Role / Timing Role: High-accuracy analog sensor interfaced to 12-bit SAR ADC in HVAC MCU. Use Value: Hermetic TO-46 package resists humidity-induced drift; ±1°C accuracy at 25°C enables tighter setpoint control without field recalibration. |
Use Scenario: Embedded winding temperature monitoring in industrial AC motors to prevent insulation failure. IC Role / Device Role / Timing Role: Direct Kelvin sensor mounted on stator core, reporting absolute temperature to motor drive controller. Use Value: 125°C max operating temperature and 200°C intermittent overrange rating support Class H insulation systems; linear output simplifies thermal model integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-terminal Kelvin temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM235H | No RoHS compliance; lead finish unspecified; same TO-46 package and −40°C to +125°C range | Used in legacy aerospace/military designs where Pb-free is not mandated | Select LM235H only if RoHS exemption applies; identical electrical specs and pinout to LM235AH |
| LM335AH/NOPB | Lower temperature range (−40°C to +100°C); plastic TO-92 package; ±2°C uncalibrated error vs. ±1°C for LM235AH | Suitable for consumer appliances and cost-sensitive indoor applications | Choose LM335AH/NOPB for lower-cost, non-hermetic use cases below 100°C; not interchangeable above 100°C or in humid environments |
Compared with LM235H and LM335AH/NOPB, the LM235AH offers superior accuracy (±1°C), hermetic reliability, and extended high-temperature capability-making it the preferred choice for industrial and automotive thermal protection where long-term stability and specification margin are critical.
Availability
LM235AH is available at Aetrix Electronics and suitable for power supply thermal monitoring, battery pack temperature sensing, and HVAC ambient sensing requiring stable component supply, long-lifecycle support, and guaranteed hermetic packaging.
Supply support for LM235AH 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 sensing and industrial-grade IC design.
The LM235AH belongs to TI's LMx35 precision temperature sensor family, engineered for direct Kelvin-scale analog output in applications demanding high linearity, low impedance, and long-term stability without digital compensation.
FAQ
What is the operating temperature range of the LM235AH?
The LM235AH operates continuously from −40°C to +125°C, with intermittent capability up to +150°C. This range is explicitly specified in TI's SNIS160E datasheet for the LM235/LM235A series and validated for the LM235AH variant in the Package Option Addendum. Its TO-46 hermetic package ensures reliable performance across this full industrial temperature span.
How does the LM235AH differ from the LM335AH/NOPB?
The LM235AH differs from the LM335AH/NOPB in three key ways: it supports a higher maximum operating temperature (125°C vs. 100°C), uses a hermetic TO-46 metal package instead of plastic TO-92, and achieves ±1°C initial accuracy versus ±2°C for the LM335AH/NOPB. These differences make the LM235AH suitable for more demanding industrial and automotive thermal protection roles.
Can the LM235AH be calibrated, and how is the ADJ pin used?
Yes, the LM235AH supports one-point calibration using its ADJ pin to correct slope (scale factor) error. As described in Section 7.3.1 of the SNIS160E datasheet, a potentiometer is connected across the device with its wiper tied to ADJ; adjusting at a known temperature (e.g., 25°C) corrects output across the full range because the LM235AH's error is predominantly linear with respect to absolute temperature.
What is the recommended bias current for the LM235AH?
The recommended bias current for the LM235AH is 1 mA, as specified in the "Typical Application" section (8.2.1) and electrical characteristics tables of the SNIS160E datasheet. It operates reliably from 400 μA to 5 mA, but 1 mA balances self-heating error (<0.2°C/khr), noise performance, and output stability-making it the standard value for calibration and design reference.
Is the LM235AH RoHS compliant?
Yes, the LM235AH/NOPB.B variant is RoHS compliant, as confirmed in TI's Package Option Addendum where "RoHS" is marked "Yes" for orderable part numbers ending in /NOPB or /NOPB.B. The base LM235AH (non-NOPB) is not RoHS compliant and uses leaded finish; designers must specify the /NOPB suffix to ensure compliance.
LM235AH 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):
- ±1°C (±2.7°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
LM235AH FAQ
1.How can I place an order for LM235AH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM235AH 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 LM235AH reliable?
The price and inventory of LM235AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM235AH is usually 5 days.
3.What payment methods are accepted for LM235AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM235AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM235AH?
LM235AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM235AH 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 LM235AH?
For technical support, including LM235AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM235AH requirements.
6.How does Aetrix verify that LM235AH is sourced from the original manufacturer or authorized distributors?
All LM235AH 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 LM235AH meets industry standards.
7.What is the process for return or replacement of LM235AH?
All LM235AH units undergo pre-shipment inspection (PSI). If there is an issue with LM235AH, 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 LM235AH part is unused and in its original packaging.
Return procedure for LM235AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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