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Texas Instruments LM35DZ/LFT2
- Part No.:
- LM35DZ/LFT2
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM35DZ/LFT2.pdf
- Description:
- SENSOR ANALOG 0C-100C TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,203
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Product details
Overview
LM35DZ/LFT2 from Texas Instruments is a precision analog-output centigrade temperature sensor in a plastic TO-92 package, delivering 10 mV/°C linear output with ±0.6°C accuracy at 25°C and operational range from 0°C to +100°C. It draws only 56 µA typical quiescent current, exhibits 0.1 Ω output impedance at 1 mA load, and operates from 4 V to 30 V supply-enabling direct interface with ADCs in battery-powered HVAC and industrial monitoring systems.
For engineers reviewing the LM35DZ/LFT2 datasheet, LM35DZ/LFT2 pinout, LM35DZ/LFT2 application, or LM35DZ/LFT2 equivalent, key selection criteria include its calibrated Celsius output scaling, low self-heating (<0.08°C in still air), wafer-trimmed accuracy, TO-92 thermal performance (RθJA = 180°C/W), and compatibility with single-supply microcontroller input stages requiring no external calibration.
Technical Context
The LM35DZ/LFT2 implements a delta-VBE temperature-sensing element buffered by a Class-A amplifier, producing a ratiometric analog voltage directly proportional to junction temperature in degrees Celsius. Its transfer function is strictly VOUT = 10 mV/°C × T, with no offset subtraction required-unlike Kelvin-referenced sensors.
It operates exclusively in analog output mode with sourcing-only capability (sink limit: 1 µA), requires no external components for basic operation, and maintains linearity within ±0.2°C typical non-linearity over its 0°C to +100°C rated range. Thermal time constant in still air is <120 seconds, and self-heating remains below 0.08°C under 1 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale Factor | 10 mV/°C - enables direct Celsius reading without offset compensation or digital calibration |
| Accuracy (25°C) | ±0.6°C tested limit - ensures reliable temperature measurement in ambient sensing applications |
| Operating Range | 0°C to +100°C - validated for consumer and industrial environments excluding extreme cold |
| Supply Voltage | 4 V to 30 V - supports wide-input power rails including unregulated battery and wall adapters |
| Quiescent Current | 56 µA typical at 5 V - minimizes battery drain in portable and remote monitoring systems |
| Output Impedance | 0.1 Ω at 1 mA load - allows direct connection to high-impedance ADC inputs without buffering |
| Thermal Resistance | RθJA = 180°C/W (TO-92) - defines maximum junction temperature rise above ambient at given power dissipation |
Pinout & Package
LM35DZ/LFT2 is housed in a 3-pin plastic TO-92 package (LP package), with case not electrically connected. Pin 1 is +VS, Pin 2 is VOUT, and Pin 3 is GND - matching standard TO-92 bottom-view orientation per TI SNIS159H Rev H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS (Pin 1) | Positive power supply input | Accepts 4–30 V DC; powers internal bandgap and amplifier; no reverse-polarity protection |
| VOUT (Pin 2) | Analog temperature output | Provides 10 mV/°C linear voltage; low-impedance source only; must not be forced below GND |
| GND (Pin 3) | Reference ground | Return path for supply and output; connects to system ground plane; no internal isolation |
Key Features
| Feature | Design Value |
|---|---|
| Calibrated in Celsius | Eliminates need for offset subtraction or Kelvin-to-Celsius conversion in firmware or signal chain |
| Wafer-level trimming | Ensures ±0.6°C accuracy at 25°C without post-package calibration, reducing BOM and test cost |
| Low self-heating | 0.08°C max in still air - preserves measurement integrity in enclosed or low-airflow enclosures |
| No external components | Operates stand-alone with only supply decoupling; simplifies layout and improves reliability |
| Single-supply operation | Functions from 4 V to 30 V with no negative rail - ideal for 5 V or 12 V industrial control systems |
Applications
| Power Supply Thermal Monitoring | Battery Pack Temperature Sensing |
|---|---|
Use Scenario: Real-time temperature tracking of switching regulator heatsinks and transformer windings in AC/DC adapters and DC/DC converters. IC Role / Device Role / Timing Role: Analog temperature transducer providing feedback to thermal shutdown circuitry or fan speed control logic. Use Value: Enables compliance with IEC 62368-1 thermal safety limits using a single-component solution with no software calibration. | Use Scenario: Continuous temperature logging inside sealed Li-ion battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Primary analog temperature sensor interfaced to battery management system (BMS) ADC inputs. Use Value: Delivers ±0.6°C accuracy at room temperature and stable 10 mV/°C slope across 0–60°C operating zone, supporting JEITA-compliant charge rate throttling. |
| HVAC Zone Sensor | Appliance Internal Temperature Control |
Use Scenario: Wall-mounted room temperature sensing in residential HVAC thermostats with wired or wireless backhaul. IC Role / Device Role / Timing Role: Centigrade reference sensor feeding into microcontroller ADC with 12-bit resolution. Use Value: Provides direct Celsius output scalable to 0.1°C resolution with minimal firmware overhead and no lookup tables. | Use Scenario: Oven cavity or refrigerator evaporator temperature monitoring in smart kitchen appliances. IC Role / Device Role / Timing Role: Analog front-end sensor for closed-loop temperature regulation via triac or compressor control. Use Value: Maintains ±0.9°C accuracy across full 0–100°C range, enabling precise cooking profiles and energy-efficient refrigeration staging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-output centigrade temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM35DT/NOPB | 8-pin SOIC package; different pinout (VOUT on Pin 1); RθJA = 220°C/W; same 0–100°C range and ±0.6°C accuracy | Suitable for surface-mount PCBs requiring higher thermal mass or automated assembly; not interchangeable in TO-92 footprints | Select LM35DT/NOPB when board space and reflow compatibility outweigh through-hole serviceability needs. |
| TSIC506-200 | Digital I²C output; ±0.5°C accuracy; 0–70°C range; integrated 12-bit ADC; 3.3 V only | Requires microcontroller I²C interface and firmware support; eliminates analog noise susceptibility but adds protocol overhead | Choose TSIC506-200 where digital immunity, multi-sensor bus sharing, or reduced analog routing complexity is prioritized. |
Compared with LM35DZ/LFT2, LM35DT/NOPB offers identical electrical performance in a surface-mount package with higher thermal resistance, while TSIC506-200 replaces analog simplicity with digital precision and narrower temperature coverage-making LM35DZ/LFT2 optimal for cost-sensitive, through-hole, single-sensor analog designs.
Availability
LM35DZ/LFT2 is available at Aetrix Electronics and suitable for HVAC zone sensing, battery pack thermal monitoring, and appliance internal temperature control requiring stable component supply and long-term industrial availability.
Supply support for LM35DZ/LFT2 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer product portfolios.
The LM35 series belongs to TI's precision analog temperature sensor product line, designed specifically for direct Celsius-output applications where calibration-free operation, low power, and ease of ADC interfacing are critical in cost-sensitive systems.
FAQ
What is the operating temperature range of the LM35DZ/LFT2?
The LM35DZ/LFT2 is rated for operation from 0°C to +100°C. This range is validated per TI SNIS159H Rev H specifications and reflects its optimized performance for consumer and industrial applications excluding sub-zero environments. Operation outside this range may result in accuracy degradation or parametric non-compliance.
Does the LM35DZ/LFT2 require external calibration or trimming?
No, the LM35DZ/LFT2 does not require external calibration or trimming. It is wafer-level trimmed to deliver ±0.6°C accuracy at 25°C and maintains its 10 mV/°C scale factor across its full 0°C to +100°C range-enabling plug-and-play integration with microcontroller ADCs without firmware compensation.
What is the maximum supply voltage for the LM35DZ/LFT2?
The absolute maximum supply voltage for the LM35DZ/LFT2 is 35 V, but the recommended operating range is 4 V to 30 V DC. Operating at 30 V maximizes dynamic range for high-temperature measurements (e.g., 100°C → 1000 mV), while maintaining quiescent current below 82 µA per datasheet Section 6.7.
Can the LM35DZ/LFT2 drive capacitive loads directly?
The LM35DZ/LFT2 can drive up to 50 pF capacitance directly. For heavier loads (e.g., long cables or ADC input capacitance >50 pF), TI recommends adding a 200 Ω series resistor between VOUT and the load to prevent oscillation-verified in Figure 12 of the SNIS159H datasheet.
Is the LM35DZ/LFT2 pin-compatible with other LM35 variants like LM35CZ or LM35DZ?
The LM35DZ/LFT2 shares the same TO-92 pinout (Pin 1: +VS, Pin 2: VOUT, Pin 3: GND) with LM35CZ and LM35DZ, making them mechanically and electrically pin-compatible in through-hole designs. However, LM35CZ has a –40°C to +110°C range and ±0.4°C accuracy, while LM35DZ/LFT2 is specified for 0°C to +100°C with ±0.6°C accuracy-so functional interchangeability depends on application temperature requirements.
LM35DZ/LFT2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Box
- Product Status:
- Obsolete
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- 0°C ~ 100°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4V ~ 30V
- Resolution:
- 10mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±1.5°C
- Test Condition:
- 25°C
- Operating Temperature:
- 0°C ~ 100°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-92-3
LM35DZ/LFT2 FAQ
1.How can I place an order for LM35DZ/LFT2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM35DZ/LFT2 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 LM35DZ/LFT2 reliable?
The price and inventory of LM35DZ/LFT2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM35DZ/LFT2 is usually 5 days.
3.What payment methods are accepted for LM35DZ/LFT2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM35DZ/LFT2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM35DZ/LFT2?
LM35DZ/LFT2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM35DZ/LFT2 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 LM35DZ/LFT2?
For technical support, including LM35DZ/LFT2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM35DZ/LFT2 requirements.
6.How does Aetrix verify that LM35DZ/LFT2 is sourced from the original manufacturer or authorized distributors?
All LM35DZ/LFT2 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 LM35DZ/LFT2 meets industry standards.
7.What is the process for return or replacement of LM35DZ/LFT2?
All LM35DZ/LFT2 units undergo pre-shipment inspection (PSI). If there is an issue with LM35DZ/LFT2, 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 LM35DZ/LFT2 part is unused and in its original packaging.
Return procedure for LM35DZ/LFT2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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