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Texas Instruments LM335AH/NOPB
- Part No.:
- LM335AH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM335AH/NOPB.pdf
- Description:
- SENSOR ANALOG -40C-100C TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:389
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Product details
Overview
LM335AH/NOPB from Texas Instruments is a precision 2-terminal Kelvin-referenced temperature sensor operating as a zener-like device with 10 mV/K output slope, ±1°C initial accuracy at 25°C, 0.5–1.5°C calibrated error over −40°C to +100°C, <1 Ω dynamic impedance, and 400 μA–5 mA operating current. It delivers linear absolute-temperature voltage output for analog temperature monitoring in industrial power supplies and battery management systems.
For engineers reviewing the LM335AH/NOPB datasheet, LM335AH/NOPB pinout, LM335AH/NOPB application, or LM335AH/NOPB equivalent, key selection considerations include its TO-46 hermetic package, Kelvin-scale calibration capability via ADJ pin, low self-heating error at 1 mA bias, and compatibility with simple resistor-bias readout circuits requiring no op-amps.
Technical Context
The LM335AH/NOPB functions as a temperature-dependent zener diode with output voltage directly proportional to absolute temperature (10 mV/K), enabling direct Kelvin-to-voltage conversion without signal conditioning. Its internal bandgap reference and curvature-compensated design ensure linearity across its full −40°C to +100°C operating range.
Calibration is performed using the ADJ pin to adjust slope at a single point (e.g., 2.982 V at 25°C), correcting scale-factor errors across the entire range due to the device's extrapolated 0 V output at 0 K. It requires only a series bias resistor and operates stably from 400 μA to 5 mA with <2.5 mV output shift over that current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | −40°C to +100°C continuous operation; supports HVAC and industrial ambient sensing without derating |
| Output Voltage Slope | 10 mV/K (2.7315 V at 0°C, 3.7315 V at 100°C); enables direct Kelvin reading with 100× scaling |
| Initial Accuracy | ±1°C at 25°C (uncalibrated); sufficient for non-critical thermal monitoring without trimming |
| Calibrated Accuracy | ±0.5°C typical over −40°C to +100°C after single-point ADJ-pin calibration at 25°C |
| Dynamic Impedance | 0.5–0.6 Ω at 1 mA; ensures minimal load-induced voltage error in high-impedance readout circuits |
| Operating Current | 400 μA to 5 mA; allows low-power battery operation (e.g., 1 mA @ 3.3 V = 3.3 mW dissipation) |
| Thermal Resistance | RθJA = 400°C/W (TO-46); mandates mechanical mounting to heatsink or PCB copper for stable die temperature |
Pinout & Package
LM335AH/NOPB uses a hermetic TO-46 metal can package (3-pin, 4.699 mm × 4.699 mm body) with center anvil lead configuration. The package provides robust moisture resistance and stable thermal performance for industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anvil) | Positive Input (+) | Main anode terminal; connects to bias resistor; carries full operating current into device |
| Pin 2 (Case) | Case / Thermal Path | Electrically connected to internal substrate; must be grounded or thermally anchored for stability |
| Pin 3 (Lead) | Negative Output (−) | Cathode terminal; voltage referenced to this pin defines absolute temperature output |
Key Features
| Feature | Design Value |
|---|---|
| Direct Kelvin Calibration | 10 mV/K output enables absolute temperature measurement without offset or gain amplification |
| Adjustable Slope Calibration | ADJ pin allows one-point slope trim at 25°C to correct for batch variation and achieve ±0.5°C system accuracy |
| Low Dynamic Impedance | <1 Ω impedance minimizes voltage droop under varying load conditions and simplifies ADC interface |
| Wide Operating Current Range | 400 μA–5 mA operation supports ultra-low-power designs (e.g., 12-bit SAR ADC sampling at 1 SPS) |
| Hermetic TO-46 Package | Sealed metal can ensures long-term stability and reliability in humid or corrosive industrial environments |
Applications
| Industrial Power Supply Monitoring | Battery Management Systems |
|---|---|
Use Scenario: Real-time thermal feedback in switch-mode power supply control loops to prevent overtemperature shutdown. IC Role / Device Role / Timing Role: Analog temperature transducer providing voltage-proportional-to-Kelvin signal to controller's ADC input. Use Value: Enables predictive thermal throttling before MOSFET junction exceeds 125°C, extending component lifetime by >30% in 24/7 operation. |
Use Scenario: Cell temperature monitoring in lithium-ion battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Primary temperature sensor interfaced to battery fuel gauge IC via ratiometric ADC reference. Use Value: Supports JEITA-compliant charging profiles by detecting >1°C/min rise rate, preventing thermal runaway during fast charge. |
| HVAC Ambient Sensing | Appliance Temperature Control |
Use Scenario: Room air temperature measurement in wall-mounted thermostats with ±0.5°C setpoint accuracy. IC Role / Device Role / Timing Role: Standalone analog sensor feeding microcontroller ADC with no external signal conditioning. Use Value: Eliminates need for thermistor + lookup table, reducing BOM cost by $0.18/unit and firmware complexity. |
Use Scenario: Oven cavity temperature feedback in smart kitchen appliances with digital display and PID control. IC Role / Device Role / Timing Role: High-stability reference sensor mounted on heat-sink near heating element. Use Value: Maintains ±1°C accuracy over 10,000-cycle life despite thermal cycling from 25°C to 250°C ambient gradients. |
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 |
|---|---|---|---|
| LM335H/NOPB | Same TO-46 package and electrical specs, but uncalibrated grade (±2°C typical error over range vs. ±1°C for LM335AH/NOPB) | Suitable for cost-sensitive applications where post-assembly calibration is feasible | Select LM335H/NOPB when system-level calibration infrastructure exists and ±2°C tolerance is acceptable |
| LM335AZ/NOPB | TO-92 plastic package (RθJA = 202°C/W vs. 400°C/W), wider -40°C to +100°C range, same 10 mV/K slope but higher non-linearity (±1.5°C vs. ±0.5°C calibrated) | Better suited for PCB-mount consumer devices with limited board space and lower thermal stress | Choose LM335AZ/NOPB for compact, non-hermetic designs where moisture resistance is not required |
Compared with LM335H/NOPB and LM335AZ/NOPB, the LM335AH/NOPB offers superior initial accuracy and hermetic reliability-critical for industrial power supplies and battery safety systems where field recalibration is impractical and long-term drift must be minimized.
Availability
LM335AH/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and HVAC control requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM335AH/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 over 50 years of precision sensor innovation.
The LM335AH/NOPB belongs to TI's LMx35 family of Kelvin-referenced temperature sensors, designed specifically for high-accuracy analog temperature measurement in industrial, automotive, and energy systems where stability and long-term calibration retention are critical.
FAQ
What is the operating temperature range of the LM335AH/NOPB?
The LM335AH/NOPB operates continuously from −40°C to +100°C, with intermittent capability up to +125°C. This range is validated per TI's SNIS160E datasheet Section 6.2 and makes the LM335AH/NOPB suitable for indoor industrial equipment and sealed battery enclosures where ambient extremes are bounded.
How do I calibrate the LM335AH/NOPB for highest accuracy?
Calibrate the LM335AH/NOPB using its ADJ pin: apply 1 mA bias current, immerse at 25°C (298.15 K), and adjust a potentiometer between + and − pins until output reads exactly 2.982 V. This single-point slope trim corrects scale error across the full range, achieving ±0.5°C typical accuracy as specified in Section 6.5 of the LM335AH/NOPB datasheet.
What package type does the LM335AH/NOPB use, and why does it matter?
The LM335AH/NOPB uses a hermetic TO-46 metal can package (3-pin, 4.699 mm × 4.699 mm). This package provides superior long-term stability, moisture resistance, and thermal conductivity versus plastic TO-92 alternatives-essential for industrial applications exposed to humidity, condensation, or thermal cycling where drift must remain below 0.1°C/year.
Can the LM335AH/NOPB be used with a microcontroller ADC without signal conditioning?
Yes-the LM335AH/NOPB outputs a clean, low-impedance (0.6 Ω) analog voltage directly proportional to Kelvin temperature (10 mV/K), allowing direct connection to most 12-bit+ microcontroller ADCs. With 1 mA bias, output spans 2.3315 V to 3.7315 V across −40°C to +100°C, fitting standard 3.3 V or 5 V reference rails without amplification or level-shifting.
What is the maximum allowable forward current for the LM335AH/NOPB?
The LM335AH/NOPB supports a continuous forward current range of 400 μA to 5 mA per Section 6.2 of the datasheet. Exceeding 5 mA risks exceeding absolute maximum ratings (10 mA peak), while currents below 400 μA increase noise susceptibility and reduce thermal response fidelity. For optimal stability and self-heating control, 1 mA is the recommended nominal bias current.
LM335AH/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 ~ 100°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- -
- Resolution:
- 10mV/°K
- Features:
- -
- Accuracy - Highest (Lowest):
- ±3°C (±5°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
LM335AH/NOPB FAQ
1.How can I place an order for LM335AH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM335AH/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 LM335AH/NOPB reliable?
The price and inventory of LM335AH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM335AH/NOPB is usually 5 days.
3.What payment methods are accepted for LM335AH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM335AH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM335AH/NOPB?
LM335AH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM335AH/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 LM335AH/NOPB?
For technical support, including LM335AH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM335AH/NOPB requirements.
6.How does Aetrix verify that LM335AH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM335AH/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 LM335AH/NOPB meets industry standards.
7.What is the process for return or replacement of LM335AH/NOPB?
All LM335AH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM335AH/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 LM335AH/NOPB part is unused and in its original packaging.
Return procedure for LM335AH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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