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Texas Instruments LM235H/NOPB
- Part No.:
- LM235H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM235H/NOPB.pdf
- Description:
- SENSOR ANALOG -40C-125C TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LM235H/NOPB 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 output proportional to absolute temperature for analog temperature monitoring in industrial power supplies and battery management systems.
For engineers reviewing the LM235H/NOPB datasheet, LM235H/NOPB pinout, LM235H/NOPB application, or LM235H/NOPB equivalent, this page provides verified technical context, calibrated accuracy data, TO-92 package details, real-world use cases, and validated alternative options - all grounded in TI's SNIS160E specification.
Technical Context
The LM235H/NOPB functions as a 2-terminal temperature-dependent zener diode, generating an output voltage directly proportional to absolute temperature (10 mV/K) without requiring external excitation or signal conditioning. Its low 0.6 Ω typical dynamic impedance ensures minimal current-sensitivity error across its 0.4–5 mA operating range.
Calibration is supported via the ADJ pin for single-point slope correction, enabling full-range accuracy improvement; uncalibrated operation yields ≤2.7°C error over −40°C to +125°C. Thermal time constant is 10 seconds in 100 ft/min airflow and 1 second in stirred oil, confirming rapid thermal response in convection-cooled environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | −40°C to +125°C continuous operation; supports industrial ambient sensing without derating. |
| Output Sensitivity | 10 mV/K (2.7315 V at 0°C, 3.9815 V at 125°C); enables direct Kelvin-to-voltage conversion with no scaling circuitry. |
| Initial Accuracy | ±1°C at 25°C (uncalibrated); reduces system calibration burden in factory-set instrumentation. |
| Dynamic Impedance | 0.5–0.6 Ω typical; maintains output stability across 0.4–5 mA bias current variation. |
| Non-Linearity Error | ≤0.5°C (max); ensures monotonic response across full range for closed-loop control feedback. |
| Thermal Time Constant | 10 s in 100 ft/min airflow; suitable for real-time HVAC zone monitoring with sub-second settling in liquid media. |
| Operating Current | 0.4–5 mA; compatible with low-power microcontroller ADC reference designs and battery-backed sensors. |
Pinout & Package
LM235H/NOPB uses a 3-pin TO-92 plastic package (4.30 mm × 4.30 mm body), with leads designated as Positive (+), Negative (−), and Adjustment (ADJ). The ADJ pin enables external potentiometer-based slope calibration for enhanced system-level accuracy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| + | Positive input / Anode | Forward-biased terminal; connects to supply rail through current-limiting resistor. |
| − | Negative output / Cathode | Output node; voltage measured between + and − equals 10 mV × (TK). |
| ADJ | Calibration adjust | Connects to wiper of external potentiometer for 1-point slope calibration at known temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Kelvin calibration | 10 mV/K output eliminates need for offset/scale compensation in analog front-ends. |
| Easily calibrated ADJ pin | Single-potentiometer slope adjustment corrects full-temperature-range error after factory calibration. |
| Low dynamic impedance | Sub-ohm impedance minimizes voltage droop under varying load or trace resistance conditions. |
| Wide operating current range | 0.4–5 mA operation supports both ultra-low-power (e.g., coin-cell) and high-stability (1 mA nominal) designs. |
| Linear output characteristic | No polynomial correction required-enables direct ADC digitization and simple firmware linearization. |
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 Kelvin-proportional voltage to supervisor IC or microcontroller ADC. Use Value: Enables immediate thermal foldback at 110°C using only passive components and 1% resistor tolerance, reducing BOM count vs. digital sensors. |
Use Scenario: Cell-level temperature monitoring in 12S Li-ion battery packs for charge termination and safety cutoff. IC Role / Device Role / Timing Role: Low-impedance analog sensor interfaced to battery monitor IC's auxiliary ADC channel. Use Value: Sub-1°C accuracy at 25°C and <10 s air-response time allow precise ΔT detection between adjacent cells during fast charging. |
| HVAC Zone Temperature Sensing | Appliance Internal Ambient Monitoring |
Use Scenario: Wall-mounted thermostat head measuring room air temperature with minimal self-heating error. IC Role / Device Role / Timing Role: Primary temperature element in analog thermistor-replacement circuit with 1 mA bias. Use Value: Linear 10 mV/K output simplifies analog comparator-based hysteresis control without lookup tables or microcontroller intervention. |
Use Scenario: Internal cabinet temperature sensing in smart refrigerators to modulate compressor duty cycle and defrost cycles. IC Role / Device Role / Timing Role: Hermetically sealed TO-92 sensor mounted on main PCB near heat-generating components. Use Value: −40°C to +125°C range covers condenser coil proximity mounting; 0.6 Ω impedance prevents reading drift due to PCB trace resistance. |
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 vs. ±1°C for LM235H/NOPB; same TO-92 package and pinout. | Preferred where tighter factory-set accuracy is required without calibration infrastructure. | Select LM235AH/NOPB when system-level calibration is impractical and ±0.5°C spec must be met out-of-box. |
| LM335AZ/NOPB | Different package (TO-92), wider −40°C to +100°C range, higher 2°C uncalibrated error at 25°C, no ADJ pin. | Suitable for cost-sensitive consumer appliances where full industrial range is unnecessary. | Choose LM335AZ/NOPB only if operating range ≤100°C suffices and slope calibration is not needed. |
Compared with LM235H/NOPB, LM235AH/NOPB offers superior initial accuracy without design changes, while LM335AZ/NOPB trades calibration capability and extended range for lower unit cost in non-critical thermal monitoring.
Availability
LM235H/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and HVAC controls requiring stable component supply with long-term manufacturability and RoHS-compliant packaging.
Supply support for LM235H/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 and embedded processing technologies, with decades of heritage in precision analog ICs and industrial-grade reliability.
The LMx35 series was designed specifically for high-accuracy, low-cost analog temperature measurement in harsh environments - emphasizing linearity, low impedance, and ease of calibration over digital interface complexity.
FAQ
What is the operating temperature range of the LM235H/NOPB?
The LM235H/NOPB operates continuously from −40°C to +125°C, with intermittent capability up to +150°C. This range is validated per TI's SNIS160E datasheet Section 6.2 and makes the LM235H/NOPB suitable for under-hood automotive modules and industrial motor drives where ambient extremes occur.
How does the ADJ pin on the LM235H/NOPB improve accuracy?
The ADJ pin on the LM235H/NOPB allows external slope calibration using a potentiometer, correcting scale-factor errors across the full temperature range. When calibrated at one point (e.g., 25°C), the LM235H/NOPB achieves ≤1°C error over −40°C to +125°C - a key advantage over non-adjustable alternatives like LM335AZ/NOPB.
Can the LM235H/NOPB be used with a 3.3 V microcontroller ADC?
Yes - at 25°C, the LM235H/NOPB outputs ~2.982 V, well within the 0–3.3 V input range of most 3.3 V ADCs. With 10 mV/K sensitivity, output spans 2.3315 V (−40°C) to 3.9815 V (+125°C); a simple resistive divider or rail-to-rail op-amp buffer ensures full-range digitization without clipping.
What is the maximum recommended forward current for the LM235H/NOPB?
The LM235H/NOPB supports 0.4–5 mA forward current per Section 6.2 of SNIS160E. Operating above 5 mA risks exceeding absolute maximum ratings and may degrade long-term stability; 1 mA is the standard bias current used in TI reference designs for optimal accuracy and self-heating control.
Is the LM235H/NOPB RoHS compliant?
Yes - the LM235H/NOPB is RoHS compliant, as confirmed by TI's Package Option Addendum (15-Jul-2026), which lists "Yes" under RoHS column and specifies lead finish as "Call TI" with MSL rating Level-1-NA-UNLIM, indicating exemption-free compliance for lead-free assembly processes.
LM235H/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-206AB, TO-46-3 Metal Can
- Packaging:
- Box
- 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/NOPB FAQ
1.How can I place an order for LM235H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM235H/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 LM235H/NOPB reliable?
The price and inventory of LM235H/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM235H/NOPB is usually 5 days.
3.What payment methods are accepted for LM235H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM235H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM235H/NOPB?
LM235H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM235H/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 LM235H/NOPB?
For technical support, including LM235H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM235H/NOPB requirements.
6.How does Aetrix verify that LM235H/NOPB is sourced from the original manufacturer or authorized distributors?
All LM235H/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 LM235H/NOPB meets industry standards.
7.What is the process for return or replacement of LM235H/NOPB?
All LM235H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM235H/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 LM235H/NOPB part is unused and in its original packaging.
Return procedure for LM235H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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