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Texas Instruments LM35DZ/LFT7
- Part No.:
- LM35DZ/LFT7
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM35DZ/LFT7.pdf
- Description:
- SENSOR ANALOG 0C-100C TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,279
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Product details
Overview
LM35DZ/LFT7 from Texas Instruments is a precision analog-output centigrade temperature sensor in TO-92 package, delivering 10 mV/°C linear output with ±0.6°C accuracy at 25°C, 0°C to +100°C operating range, and 56 µA quiescent current. It interfaces directly to ADCs or microcontrollers in thermal monitoring circuits without external calibration.
For engineers reviewing the LM35DZ/LFT7 datasheet, LM35DZ/LFT7 pinout, LM35DZ/LFT7 application, or LM35DZ/LFT7 equivalent, key selection criteria include its guaranteed 0°C–100°C range, low self-heating (0.08°C in still air), TO-92 mechanical compatibility, and absence of offset subtraction requirements for Celsius scaling.
Technical Context
The LM35DZ/LFT7 implements a delta-VBE temperature-sensing element buffered by a class-A amplifier with ~0.5 Ω output impedance, enabling direct high-impedance load interfacing. Its transfer function is strictly VOUT = 10 mV/°C × T, with no internal offset or gain trimming required.
It operates from 4 V to 30 V supply, draws ≤80 µA across temperature, and exhibits ±0.5°C nonlinearity over its full rated range. The device is unidirectional-capable of sourcing current only, with sinking limited to 1 µA-making it unsuitable for active pull-down configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale | 10 mV/°C linear analog voltage - enables direct Celsius readout without offset subtraction |
| Accuracy (25°C) | ±0.6°C tested limit - ensures reliable room-temperature calibration in battery management and HVAC control |
| Operating Range | 0°C to +100°C - validated for industrial enclosures and consumer appliance thermal zones |
| Supply Voltage | 4 V to 30 V - supports single-supply operation across 5 V, 12 V, and 24 V systems |
| Quiescent Current | 56 µA at 25°C - enables multi-year battery life in remote sensor nodes |
| Output Impedance | 0.5 Ω typical - drives 1 mA loads with <±0.5 mV error, simplifying RC filtering |
| Self-Heating Error | 0.08°C in still air - negligible impact on ambient temperature measurement accuracy |
Pinout & Package
LM35DZ/LFT7 uses a 3-pin TO-92 plastic transistor package (body size 4.30 mm × 4.30 mm) with bottom-view pinout. Pin 1 is +VS, Pin 2 is VOUT, and Pin 3 is GND. The case is electrically isolated from all terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS (Pin 1) | Positive power supply input | Accepts 4–30 V DC; reverse polarity protection not integrated |
| VOUT (Pin 2) | Analog temperature output | Source-only output; must connect to high-impedance or buffered input (≥10 kΩ) |
| GND (Pin 3) | Device ground reference | Common return for supply and output; requires low-impedance connection to system ground |
Key Features
| Feature | Design Value |
|---|---|
| Centigrade-linear output | Eliminates need for Kelvin-to-Celsius conversion circuitry or software offset compensation |
| Wafer-level trimming | Ensures ±0.6°C accuracy at 25°C without end-of-line calibration, reducing BOM and test cost |
| Low self-heating | 0.08°C error in still air enables accurate ambient temperature sensing without forced airflow |
| No external components | Operates standalone - no capacitors, resistors, or op-amps required for basic functionality |
| Single-supply operation | Functions from 4 V to 30 V with no negative rail, simplifying power architecture in embedded systems |
Applications
| Power Supply Thermal Monitoring | Battery Pack Temperature Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking in switching power supplies to prevent thermal shutdown. IC Role / Device Role / Timing Role: Analog temperature transducer providing feedback to PWM controller or protection logic. Use Value: Enables dynamic derating before junction exceeds 125°C, extending MOSFET lifetime and improving reliability. |
Use Scenario: Cell-level temperature measurement in Li-ion battery packs for charge/discharge safety cutoff. IC Role / Device Role / Timing Role: Centigrade-scaled analog sensor feeding into battery management system (BMS) ADC. Use Value: ±0.6°C accuracy at 25°C ensures precise thermal threshold enforcement during fast charging. |
| HVAC Zone Sensing | Appliance Cavity Temperature Control |
Use Scenario: Wall-mounted thermostat measuring ambient air temperature in residential HVAC systems. IC Role / Device Role / Timing Role: Primary temperature sensing element interfaced to microcontroller via 10-bit ADC. Use Value: 10 mV/°C scaling allows direct integer arithmetic in firmware, eliminating floating-point operations. |
Use Scenario: Oven cavity temperature feedback in smart kitchen appliances during bake or convection cycles. IC Role / Device Role / Timing Role: Analog sensor mounted on heat-resistant PCB near heating element. Use Value: 0°C–100°C range covers full operational envelope; TO-92 package withstands sustained 85°C board temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-output temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM35DT/NOPB | 8-pin SOIC package; different pinout (Pin 1 = +VS, Pin 2 = VOUT, Pin 4 = GND); same electrical specs | Requires PCB redesign due to 8-pin SOIC footprint and altered pin assignment | Select when surface-mount assembly, higher thermal mass, or tighter layout spacing is required |
| TSIC306-100 | Digital I²C output; ±0.5°C accuracy; 0.5 µA sleep current; built-in 12-bit ADC | Replaces analog signal chain with digital interface; eliminates external ADC and noise-sensitive routing | Select when system already uses I²C bus and firmware supports digital sensor protocols |
Compared with LM35DT/NOPB, LM35DZ/LFT7 offers drop-in replacement in through-hole designs but lacks SOIC thermal performance; compared with TSIC306-100, it avoids I²C dependency and firmware overhead but requires external ADC and careful analog layout.
Availability
LM35DZ/LFT7 is available at Aetrix Electronics and suitable for power supply thermal monitoring, battery pack temperature sensing, and HVAC zone sensing requiring stable component supply across industrial and consumer production programs.
Supply support for LM35DZ/LFT7 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, embedded processing, and connectivity technologies, with decades of heritage in precision analog ICs.
The LM35 series was designed specifically for low-cost, high-accuracy centigrade temperature measurement in industrial, automotive, and consumer systems-prioritizing simplicity, wafer-level calibration, and wide supply tolerance.
FAQ
What is the operating temperature range of the LM35DZ/LFT7?
The LM35DZ/LFT7 is specified for 0°C to +100°C operation, with tested accuracy limits across this full range. Unlike the broader-range LM35 (−55°C to +150°C), the LM35DZ/LFT7 variant is optimized for cost-sensitive applications where extreme cold or high-heat operation is unnecessary. Its performance is validated per TI's SNIS159H datasheet Section 6.3.
Does the LM35DZ/LFT7 require external calibration or trimming?
No, the LM35DZ/LFT7 does not require external calibration or trimming. It achieves ±0.6°C accuracy at 25°C through wafer-level laser trimming, and its 10 mV/°C transfer function is inherently referenced to 0°C. This eliminates the need for system-level offset adjustment or gain calibration routines in firmware or hardware.
Can the LM35DZ/LFT7 drive a 10-kΩ load directly?
Yes, the LM35DZ/LFT7 can drive a 10-kΩ load directly. With a typical output impedance of 0.5 Ω and maximum load regulation of ±0.4 mV/mA, loading with 10 kΩ (0.5 mA at 5 V) introduces less than ±0.2 mV error - well within its ±0.6°C accuracy band. No buffer amplifier is needed for standard ADC interfacing.
What is the supply voltage range for the LM35DZ/LFT7?
The LM35DZ/LFT7 operates from 4 V to 30 V DC, supporting common industrial rails (12 V, 24 V) and standard logic supplies (5 V). Its wide range accommodates unregulated wall adapters and battery-powered systems with voltage droop, while maintaining specified accuracy and output linearity per Section 6.3 of the TI datasheet.
Is the LM35DZ/LFT7 pin-compatible with other LM35 variants like LM35CZ?
No, the LM35DZ/LFT7 is not pin-compatible with LM35CZ. Both use TO-92 packages, but LM35CZ has identical pinout (Pin 1 = +VS, Pin 2 = VOUT, Pin 3 = GND), whereas LM35DZ/LFT7 shares that same pinout - however, LM35CZ is rated for −40°C to +110°C and has tighter ±0.4°C accuracy at 25°C. Electrical substitution requires validation of temperature range and accuracy requirements.
LM35DZ/LFT7 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/LFT7 FAQ
1.How can I place an order for LM35DZ/LFT7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM35DZ/LFT7 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/LFT7 reliable?
The price and inventory of LM35DZ/LFT7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM35DZ/LFT7 is usually 5 days.
3.What payment methods are accepted for LM35DZ/LFT7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM35DZ/LFT7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM35DZ/LFT7?
LM35DZ/LFT7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM35DZ/LFT7 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/LFT7?
For technical support, including LM35DZ/LFT7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM35DZ/LFT7 requirements.
6.How does Aetrix verify that LM35DZ/LFT7 is sourced from the original manufacturer or authorized distributors?
All LM35DZ/LFT7 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/LFT7 meets industry standards.
7.What is the process for return or replacement of LM35DZ/LFT7?
All LM35DZ/LFT7 units undergo pre-shipment inspection (PSI). If there is an issue with LM35DZ/LFT7, 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/LFT7 part is unused and in its original packaging.
Return procedure for LM35DZ/LFT7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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