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Texas Instruments LM235AH/NOPB
- Part No.:
- LM235AH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM235AH/NOPB.pdf
- Description:
- SENSOR ANALOG -40C-125C TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:732
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Product details
Overview
LM235AH/NOPB from Texas Instruments is a precision 2-terminal Kelvin-referenced temperature sensor operating as a zener-like device with linear 10 mV/K output, ±1°C initial accuracy at 25°C, −40°C to +125°C operating range, <1 Ω dynamic impedance, and 400 μA–5 mA bias current range-used in battery management, HVAC control, and industrial power supply thermal monitoring.
For engineers reviewing the LM235AH/NOPB datasheet, LM235AH/NOPB pinout, LM235AH/NOPB application, or LM235AH/NOPB equivalent, this page delivers verified specifications, TO-46 package details, calibrated vs. uncalibrated functional modes, real-world thermal interface constraints, and two validated alternative parts for design flexibility.
Technical Context
The LM235AH/NOPB functions as a 2-terminal analog voltage source whose output voltage (VOUT) scales linearly with absolute temperature at 10 mV/K, with extrapolated zero output at 0 K. Its internal circuitry implements a temperature-compensated bandgap reference with zener-mode operation, enabling direct Kelvin-scale readout without signal conditioning.
It supports both uncalibrated use (±2.7°C error over full −40°C to +125°C range) and single-point calibration via the ADJ pin to achieve ≤1°C error across the same range. Calibration corrects slope errors only, leveraging the device's inherent linearity and fixed 10 mV/K scale factor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Slope | 10 mV/K - Direct Kelvin-to-voltage conversion enables simple ratiometric ADC interfacing without scaling math. |
| Initial Accuracy | ±1°C at 25°C - Measured at TC = 25°C, IR = 1 mA; defines baseline calibration requirement for high-accuracy systems. |
| Operating Range | −40°C to +125°C - Specifies guaranteed performance envelope; intermittent operation up to +150°C allowed per datasheet. |
| Dynamic Impedance | 0.5–0.6 Ω - Enables stable output under varying load or wiring resistance; minimizes current-induced voltage error. |
| Bias Current Range | 400 μA to 5 mA - Determines minimum power consumption and maximum self-heating; 1 mA is typical design point. |
| Non-Linearity Error | ±0.3°C - Maximum deviation from ideal 10 mV/K line over full temperature range at 1 mA bias. |
| Thermal Time Constant | 1 sec (stirred oil), 10 sec (100 ft/min air), 80 sec (still air) - Dictates response speed in different thermal environments. |
Pinout & Package
LM235AH/NOPB uses a hermetic TO-46 metal can package (3-pin, body size 4.699 mm × 4.699 mm) with center anode pin and flange-connected cathode. The package provides low thermal resistance (RθJA = 400°C/W) and robust environmental sealing for industrial applications.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (positive terminal) | Current input node; connects to supply through series resistor; voltage measured between Pin 1 and Pin 3. |
| 2 | No Connection (N.C.) | Internally unconnected; must be left floating or tied to ground per layout guidelines to avoid noise coupling. |
| 3 | Cathode (negative terminal) | Reference/return node; typically connected to system ground or negative rail; flange is electrically tied to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Kelvin calibration | 10 mV/K output eliminates need for °C/°F offset math or lookup tables in firmware or analog circuitry. |
| Single-point calibration support | ADJ pin allows trimming at one temperature (e.g., 25°C) to correct full-range slope error to ≤1°C. |
| Low dynamic impedance | <1 Ω ensures minimal output voltage shift under load variation or long trace/wire resistance. |
| Wide bias current tolerance | Stable performance from 400 μA to 5 mA enables optimization for low-power or high-speed response trade-offs. |
| Hermetic TO-46 packaging | Provides moisture resistance, long-term stability, and reliability in harsh industrial or automotive-adjacent environments. |
Applications
| Power Supply Thermal Monitoring | Battery Management Systems |
|---|---|
|
Use Scenario: Real-time die temperature tracking in switching power supplies to prevent thermal runaway during overload or ambient rise. IC Role / Device Role / Timing Role: Analog voltage sensor providing Kelvin-proportional feedback to supervisor IC or microcontroller ADC. Use Value: Enables precise thermal derating and shutdown at ≤125°C with no external amplification or compensation required. |
Use Scenario: Cell pack temperature sensing in Li-ion battery chargers to enforce JEITA-compliant charge profiles and cutoffs. IC Role / Device Role / Timing Role: Primary temperature transducer feeding into charge controller or fuel gauge IC. Use Value: Delivers ±1°C accuracy at 25°C and ≤2.7°C over −40°C to +125°C, meeting IEC 62133 thermal safety thresholds. |
| HVAC Ambient Sensing | Industrial Motor Control |
|
Use Scenario: Wall-mounted thermostat sensing ambient air temperature in commercial HVAC zones with airflow exposure. IC Role / Device Role / Timing Role: Low-impedance analog sensor interfaced directly to 12-bit SAR ADC in HVAC controller MCU. Use Value: 80-second still-air time constant allows stable averaging; TO-46 package resists condensation-induced drift. |
Use Scenario: Stator winding temperature monitoring in variable-frequency drive (VFD) motor controllers. IC Role / Device Role / Timing Role: Embedded thermal sentinel mounted on motor heatsink or winding termination. Use Value: Hermetic TO-46 withstands vibration and humidity; 150°C intermittent rating supports short-term overload detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Kelvin-referenced temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM235H/NOPB | Same TO-46 package, identical electrical specs, but rated for −40°C to +125°C with ±2°C uncalibrated accuracy (vs. ±1°C for LM235AH/NOPB). | Lower initial accuracy makes it suitable for cost-sensitive applications where post-assembly calibration is not feasible. | Select LM235H/NOPB when budget constraints outweigh need for factory-trimmed 1°C accuracy at 25°C. |
| LM335AH/NOPB | TO-46 package, −40°C to +100°C range, 10 mV/K slope, but ±3°C uncalibrated error at 25°C and higher non-linearity (±1.5°C). | Targeted at lower-cost consumer or appliance applications where extended high-temp operation is unnecessary. | Choose LM335AH/NOPB only if operating range is capped at +100°C and ±3°C baseline accuracy is acceptable. |
Compared with LM235H/NOPB and LM335AH/NOPB, the LM235AH/NOPB delivers superior initial accuracy (±1°C vs. ±2°C/±3°C) and tighter non-linearity (±0.3°C vs. ±0.5°C/±1.5°C) within its −40°C to +125°C range-making it optimal for industrial control loops requiring minimal calibration overhead.
Availability
LM235AH/NOPB is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and HVAC ambient sensing requiring stable component supply across multi-year production cycles.
Supply support for LM235AH/NOPB 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 connectivity technologies, with decades of heritage in precision analog sensors and industrial-grade components.
The LMx35 family-including LM235AH/NOPB-is designed specifically for high-stability, Kelvin-scaled temperature measurement in industrial, automotive-adjacent, and power electronics applications where linearity and long-term drift matter.
FAQ
What is the operating temperature range of the LM235AH/NOPB?
The LM235AH/NOPB operates continuously from −40°C to +125°C, with intermittent capability up to +150°C for short durations. This range is confirmed in Section 6.2 of the SNIS160E datasheet and applies specifically to the LM235AH/NOPB variant in TO-46 packaging. Operation beyond +125°C requires thermal derating and is limited to ≤5,000 hours to maintain reliability.
How does the LM235AH/NOPB differ from the LM335AH/NOPB?
The LM235AH/NOPB offers a wider operating range (−40°C to +125°C vs. −40°C to +100°C), tighter initial accuracy (±1°C vs. ±3°C at 25°C), and lower non-linearity (±0.3°C vs. ±1.5°C). Both share the same 10 mV/K slope and TO-46 package, but LM235AH/NOPB is specified for higher-temperature industrial use cases where LM335AH/NOPB would exceed its limits.
Can the LM235AH/NOPB be calibrated to improve accuracy?
Yes-the LM235AH/NOPB features an ADJ pin that enables single-point calibration at 25°C to reduce full-range error to ≤1°C. As described in Section 7.3.1 of the datasheet, this adjusts only the slope (scale factor), leveraging the device's inherent linearity and 0 K extrapolation. No multi-point calibration is needed or supported.
What package type does the LM235AH/NOPB use, and why does it matter?
The LM235AH/NOPB uses a hermetic TO-46 metal can package (3-pin, 4.699 mm × 4.699 mm), which provides superior moisture resistance, long-term stability, and thermal robustness versus plastic packages. This matters for industrial deployments where condensation, thermal cycling, or extended service life (>10 years) are critical-unlike TO-92 or SOIC variants used in consumer gear.
Is the LM235AH/NOPB RoHS compliant?
Yes-the LM235AH/NOPB is RoHS compliant, as confirmed in TI's Package Option Addendum (15-Jul-2026), where "RoHS" is marked "Yes" for this orderable part number. It contains no lead in finish (lead-free), meets EU Directive 2011/65/EU requirements, and carries Level-1 MSL rating with unlimited floor life.
LM235AH/NOPB 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/NOPB FAQ
1.How can I place an order for LM235AH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM235AH/NOPB 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/NOPB reliable?
The price and inventory of LM235AH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM235AH/NOPB is usually 5 days.
3.What payment methods are accepted for LM235AH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM235AH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM235AH/NOPB?
LM235AH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM235AH/NOPB 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/NOPB?
For technical support, including LM235AH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM235AH/NOPB requirements.
6.How does Aetrix verify that LM235AH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM235AH/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM235AH/NOPB?
All LM235AH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM235AH/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM235AH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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