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STMicroelectronics LM335ADT
- Part No.:
- LM335ADT
- Manufacturer:
- STMicroelectronics
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM335ADT.pdf
- Description:
- SENSOR ANALOG -40C-100C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:21,953
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Product details
Overview
LM335ADT from STMicroelectronics is a precision 2-terminal Zener-based temperature sensor calibrated in Kelvin, delivering 10 mV/°K linear output with ±1°C initial accuracy over −40°C to +100°C. It operates from 450 µA to 5 mA, exhibits <0.6 Ω dynamic impedance, and is housed in an SO-8 plastic micropackage. It serves as a direct-replacement analog temperature transducer in industrial monitoring and embedded thermal control loops.
For engineers reviewing the LM335ADT datasheet, LM335ADT pinout, LM335ADT application, or LM335ADT equivalent, this page provides verified electrical parameters, package-specific terminal mapping, real-world use cases in closed-loop thermal systems, and validated alternative options for design flexibility and supply continuity.
Technical Context
The LM335ADT functions as a temperature-dependent Zener diode with output voltage directly proportional to absolute temperature (10 mV/°K), enabling linear analog sensing without signal conditioning ICs. Its low dynamic impedance (<0.6 Ω) ensures minimal load-induced error across its 450 µA–5 mA operating current range.
Calibration at +25°C yields ≤1°C error over its full −40°C to +100°C operating range; uncalibrated error is ≤3°C. Non-linearity is ≤1.5°C, and self-heating effects are mitigated by low-current operation and optional external slope calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Sensitivity | 10 mV/°K - enables direct Kelvin-to-voltage conversion with no scaling circuitry |
| Initial Accuracy | ±1°C at +25°C - supports single-point calibration for system-level thermal accuracy |
| Operating Current Range | 450 µA to 5 mA - allows low-power battery operation while maintaining linearity |
| Dynamic Impedance | 0.5–0.6 Ω - minimizes voltage droop under varying load or PCB trace resistance |
| Temperature Range | −40°C to +100°C - suitable for commercial and industrial ambient environments |
| Non-linearity Error | ≤1.5°C - ensures predictable deviation across full scale without polynomial correction |
| Thermal Time Constant | 1 s in stirred oil - enables rapid response in liquid or high-convection thermal interfaces |
Pinout & Package
LM335ADT is supplied in an SO-8 plastic micropackage (JEDEC MS-012AC). Pin assignments are defined per top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | V− (Cathode) | Negative reference terminal; connects to system ground or low-side current sense |
| Pin 2 | NC | No internal connection; must be left floating or tied to ground per layout best practice |
| Pin 3 | NC | No internal connection; electrically isolated; avoid routing signals nearby |
| Pin 4 | NC | No internal connection; unused pad; no soldering required |
| Pin 5 | V+ | Anode input; supplies bias current (450 µA–5 mA) and sets operating point |
| Pin 6 | NC | No internal connection; thermally isolated from die; no electrical function |
| Pin 7 | ADJ | Adjust terminal for fine calibration; used with external potentiometer to trim slope error |
| Pin 8 | NC | No internal connection; mechanical support only; not bonded to die |
Key Features
| Feature | Design Value |
|---|---|
| Linear Kelvin-scale output | Eliminates need for lookup tables or digital compensation in analog front-end designs |
| Single-point calibration capability | Corrects slope-only error across full temperature range using one known reference point |
| Low self-heating at 1 mA | Reduces thermal measurement offset to <0.2°C in still-air environments |
| ECOPACK® lead-free packaging | Meets RoHS and JEDEC JESD97 requirements for environmentally compliant manufacturing |
| Stable operation over wide current range | Maintains 10 mV/°K sensitivity across 450 µA–5 mA, easing power budget allocation |
Applications
| Industrial Oven Control | Environmental Data Logger |
|---|---|
Use Scenario: Monitoring chamber temperature in programmable heating systems with PID feedback. IC Role / Device Role / Timing Role: Analog temperature transducer providing real-time Kelvin-scaled voltage to ADC input of microcontroller. Use Value: ±1°C accuracy enables tight thermal setpoint control without software compensation; SO-8 footprint supports compact PCB layout near heat source. | Use Scenario: Battery-powered outdoor sensor node logging ambient temperature over extended periods. IC Role / Device Role / Timing Role: Low-current temperature sensing element interfaced to ultra-low-power MCU ADC. Use Value: 450 µA minimum operating current extends battery life; 1 s thermal time constant captures meaningful diurnal trends. |
| Differential Thermal Monitor | Thermocouple Cold-Junction Compensation |
Use Scenario: Detecting temperature gradients across PCBs or heat sinks in power electronics modules. IC Role / Device Role / Timing Role: Paired LM335ADT units measuring local vs. reference junction temperatures. Use Value: Matched 10 mV/°K sensitivity ensures consistent gain across dual channels; SO-8 package allows symmetrical placement for thermal tracking. | Use Scenario: Compensating for cold-junction drift in grounded K-type thermocouple measurements. IC Role / Device Role / Timing Role: Precision reference sensor placed adjacent to thermocouple terminals on same copper plane. Use Value: ≤1.5°C non-linearity avoids introducing second-order errors into thermocouple linearization algorithms. |
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 |
|---|---|---|---|
| LM335AZT | TO-92 package; ±1°C accuracy over same −40°C to +100°C range; higher thermal mass | Better suited for through-hole prototyping or high-vibration environments where SO-8 may suffer mechanical stress | Select when board-level shock resistance or hand-soldering is prioritized over space efficiency |
| TSYS01 | Digital I²C output; ±0.2°C typical accuracy; integrated ADC and compensation; 2.2–3.6 V supply | Requires no external ADC or calibration circuitry but adds firmware dependency and interrupt latency | Select when digital interface, higher accuracy, and reduced analog noise susceptibility outweigh added software complexity |
Compared with LM335ADT, LM335AZT offers identical electrical performance in a robust through-hole package ideal for ruggedized assemblies, while TSYS01 delivers superior accuracy and integration at the cost of analog simplicity and deterministic timing behavior.
Availability
LM335ADT is available at Aetrix Electronics and suitable for industrial oven control, environmental data logging, differential thermal monitoring, and thermocouple cold-junction compensation requiring stable component supply and long-term production continuity.
Supply support for LM335ADT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LM335 series belongs to ST's precision analog sensor product line, engineered specifically for Kelvin-referenced, low-drift thermal measurement in cost-sensitive and space-constrained embedded systems.
FAQ
What is the correct bias current for optimal accuracy in the LM335ADT?
The LM335ADT achieves specified ±1°C accuracy at 1 mA bias current, as validated in ST's characterization test conditions. Operating between 450 µA and 5 mA maintains linearity, but 1 mA balances self-heating error (<0.2°C) and noise immunity. Lower currents increase susceptibility to EMI; higher currents raise junction temperature and require thermal derating.
Can the ADJ pin be left unconnected in standard operation?
Yes - the ADJ pin is optional and may be left open for basic operation. It is only required when performing external slope calibration using a series potentiometer between V+ and ADJ to adjust output gain. Leaving it unconnected preserves factory calibration and simplifies layout in fixed-gain applications.
How does the SO-8 package affect thermal response compared to TO-92?
The SO-8 package reduces thermal time constant to ~1 s in stirred oil versus ~80 s in still air for TO-92, due to lower thermal mass and improved surface-area-to-volume ratio. This enables faster transient response in forced-air or liquid-cooled environments, though PCB copper pour design significantly influences actual thermal coupling.
Is the LM335ADT suitable for automotive under-hood applications?
No - the LM335ADT is rated for −40°C to +100°C and is not qualified to AEC-Q200. ST's automotive-grade alternatives (e.g., TSYS02D) offer extended temperature range (−40°C to +125°C), enhanced ESD robustness, and PPAP documentation. Use LM335ADT only in non-safety-critical commercial or industrial settings.
LM335ADT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
LM335ADT FAQ
1.How can I place an order for LM335ADT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM335ADT 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 LM335ADT reliable?
The price and inventory of LM335ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM335ADT is usually 5 days.
3.What payment methods are accepted for LM335ADT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM335ADT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM335ADT?
LM335ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM335ADT 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 LM335ADT?
For technical support, including LM335ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM335ADT requirements.
6.How does Aetrix verify that LM335ADT is sourced from the original manufacturer or authorized distributors?
All LM335ADT 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 LM335ADT meets industry standards.
7.What is the process for return or replacement of LM335ADT?
All LM335ADT units undergo pre-shipment inspection (PSI). If there is an issue with LM335ADT, 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 LM335ADT part is unused and in its original packaging.
Return procedure for LM335ADT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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