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Texas Instruments LM335AZ
- Part No.:
- LM335AZ
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM335AZ.pdf
- Description:
- SENSOR ANALOG -40C-100C TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,230
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Product details
Overview
LM335AZ from Texas Instruments is a precision 2-terminal Kelvin-referenced temperature sensor operating as a zener-like device with linear 10 mV/K output, ±2°C uncalibrated accuracy over −40°C to +100°C, <1 Ω dynamic impedance, and bias current range of 400 μA–5 mA - used in battery management, HVAC control, and power supply thermal monitoring.
For engineers reviewing the LM335AZ datasheet, LM335AZ pinout, LM335AZ application, or LM335AZ equivalent, this page delivers verified technical context, package-specific pin functions, calibrated vs. uncalibrated operation modes, real-world thermal interface constraints, and two validated alternative parts for design continuity.
Technical Context
The LM335AZ operates as a 2-terminal temperature-dependent zener diode with output voltage directly proportional to absolute temperature (10 mV/K), requiring external current biasing between 400 μA and 5 mA. Its low 0.6 Ω typical dynamic impedance ensures stable voltage output across the full bias range.
It supports both uncalibrated use (±2°C error over −40°C to +100°C) and single-point calibration via the ADJ pin to achieve ±1°C accuracy; calibration corrects slope error only, leveraging the device's inherent linearity and 0 K extrapolation point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | −40°C to +100°C continuous operation - defines usable ambient envelope without derating. |
| Output Sensitivity | 10 mV/K - enables direct Kelvin-to-voltage conversion; 298.2 mV at 25°C (298.15 K). |
| Uncalibrated Accuracy | ±2°C over full range - specifies worst-case deviation without adjustment at 1 mA bias. |
| Dynamic Impedance | 0.6 Ω typical - ensures minimal output voltage shift under varying load or bias current. |
| Bias Current Range | 400 μA to 5 mA - sets minimum drive capability required from series resistor or current source. |
| Thermal Time Constant | 1 sec in stirred oil - indicates fastest practical response time under ideal heat transfer conditions. |
| Self-Heating Error | ~0.2°C/mW - quantifies temperature rise due to internal power dissipation at 1 mA bias. |
Pinout & Package
LM335AZ is housed in a plastic TO-92 package (3-pin, vertical lead configuration), with leads designated as Anode (+), Cathode (−), and ADJ (adjust). The package provides low-cost, through-hole mounting and moderate thermal coupling to PCB or heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (+) | Positive terminal / input current entry | Receives bias current; voltage measured relative to cathode; polarity must match zener orientation. |
| Cathode (−) | Negative terminal / output reference | Serves as circuit ground reference point; output voltage appears across anode-to-cathode. |
| ADJ | Calibration adjustment terminal | Allows single-point slope calibration via external potentiometer; not connected in uncalibrated use. |
Key Features
| Feature | Design Value |
|---|---|
| Linear Kelvin-scale output | 10 mV/K transfer function eliminates need for lookup tables or nonlinear compensation. |
| Single-point calibration support | ADJ pin enables field or production calibration to ±1°C using one known temperature point. |
| Low dynamic impedance | 0.6 Ω typical ensures stable output despite supply ripple or load variations up to 5 mA. |
| Wide bias current tolerance | Operates reliably from 400 μA to 5 mA - simplifies series resistor selection across supply voltages. |
| TO-92 mechanical compatibility | Standard 3-pin through-hole footprint enables drop-in replacement in legacy thermal sensing designs. |
Applications
| Power Supply Thermal Monitoring | Battery Management Systems |
|---|---|
Use Scenario: Real-time die temperature tracking in DC-DC converters and LDO regulators to prevent thermal shutdown or efficiency loss. IC Role / Device Role / Timing Role: Analog voltage-output temperature transducer interfaced to ADC or comparator for closed-loop thermal control. Use Value: Enables accurate thermal margining with <1 Ω output impedance minimizing signal degradation over PCB traces. |
Use Scenario: Cell pack temperature sensing in portable Li-ion chargers and fuel gauges to enforce charge/discharge safety limits. IC Role / Device Role / Timing Role: Primary analog temperature sensor providing Kelvin-proportional voltage to microcontroller ADC input. Use Value: 10 mV/K scaling allows direct firmware interpretation without gain/offset correction in most 12-bit systems. |
| HVAC Ambient Sensing | Industrial Appliance Control |
Use Scenario: Room air temperature measurement in thermostats and climate controllers where long-term stability and low cost are critical. IC Role / Device Role / Timing Role: Standalone analog sensor feeding into op-amp conditioning or microcontroller analog front end. Use Value: ±2°C uncalibrated accuracy meets Class B HVAC requirements; TO-92 package allows easy mounting on thermally conductive housing. |
Use Scenario: Oven cavity or motor winding temperature monitoring in smart kitchen appliances and laundry equipment. IC Role / Device Role / Timing Role: Direct Kelvin-scaled analog feedback element in thermal protection circuits and PID temperature regulation loops. Use Value: 100°C max operating limit aligns with common appliance thermal cutoff thresholds; ADJ pin supports factory calibration during final test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision analog temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM335A | Improved initial accuracy (±1°C vs. ±2°C uncalibrated); same TO-92 package and pinout. | Preferred where tighter factory accuracy reduces need for system-level calibration. | Select LM335A when higher baseline accuracy justifies minor cost premium and no ADJ pin usage is planned. |
| TS335Z | Pin-compatible TO-92 variant from STMicroelectronics; ±2.5°C uncalibrated accuracy; 10 mV/K output. | Valid for second-source procurement in cost-sensitive industrial designs with relaxed calibration requirements. | Choose TS335Z when dual-sourcing is mandated and ±2.5°C tolerance is acceptable for the target application. |
Compared with LM335AZ, LM335A offers better out-of-box accuracy without changing layout or firmware, while TS335Z provides a qualified second source with identical form-factor but slightly wider tolerance - both preserve the 10 mV/K scaling and TO-92 mechanical fit.
Availability
LM335AZ is available at Aetrix Electronics and suitable for battery management, HVAC control, and industrial appliance applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for LM335AZ 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 sensors and power management ICs.
The LM335AZ belongs to TI's LMx35 family of Kelvin-referenced temperature sensors, designed specifically for cost-sensitive, high-volume thermal monitoring in industrial, automotive, and consumer systems where linearity and ease of calibration are essential.
FAQ
What is the operating temperature range of the LM335AZ?
The LM335AZ operates continuously from −40°C to +100°C. It supports intermittent exposure up to +125°C per TI's datasheet specifications. This range is validated for the TO-92 plastic package variant and applies under recommended bias conditions (400 μA–5 mA). Operation outside this range risks permanent parametric shift or failure.
How does the ADJ pin on the LM335AZ function in calibration?
The ADJ pin on the LM335AZ enables single-point slope calibration by connecting an external potentiometer between anode and cathode, with its wiper tied to ADJ. Adjusting the pot changes the effective scale factor to correct for output voltage error at one known temperature - typically 25°C - thereby improving accuracy across the full range. The LM335AZ must remain unbiased during calibration setup.
Can the LM335AZ be used in a 3.3 V system?
Yes, the LM335AZ can operate from a 3.3 V supply when paired with a properly sized series current-limiting resistor. At 25°C, its nominal output is ~2.98 V; subtracting forward drop and ensuring ≥400 μA bias yields a minimum supply headroom of ~350 mV. A 1 kΩ resistor delivers ~330 μA at 3.3 V - sufficient for basic operation but near the lower limit for optimal stability.
What is the thermal time constant of the LM335AZ in still air?
The LM335AZ exhibits a thermal time constant of approximately 80 seconds in still air, as specified in TI's SNIS160E datasheet. This value reflects the time required for the die temperature to reach 63% of a step-change ambient temperature. For faster response, forced airflow or immersion in stirred oil (1 sec time constant) is required - critical for dynamic thermal control loops.
Is the LM335AZ RoHS compliant?
Yes, the LM335AZ/NOPB.B variant is RoHS compliant, as confirmed in TI's official packaging addendum. The "NOPB" suffix denotes lead-free finish, and the part carries full exemption compliance documentation. Non-NOPB variants (e.g., LM335AZ/B) are not RoHS compliant and contain lead in the termination finish.
LM335AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-92-3
LM335AZ FAQ
1.How can I place an order for LM335AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM335AZ 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 LM335AZ reliable?
The price and inventory of LM335AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM335AZ is usually 5 days.
3.What payment methods are accepted for LM335AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM335AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM335AZ?
LM335AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM335AZ 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 LM335AZ?
For technical support, including LM335AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM335AZ requirements.
6.How does Aetrix verify that LM335AZ is sourced from the original manufacturer or authorized distributors?
All LM335AZ 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 LM335AZ meets industry standards.
7.What is the process for return or replacement of LM335AZ?
All LM335AZ units undergo pre-shipment inspection (PSI). If there is an issue with LM335AZ, 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 LM335AZ part is unused and in its original packaging.
Return procedure for LM335AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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